[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "1.1"]
[White "Badelka, Olga"]
[Black "Zhu, Jiner"]
[Result "0-1"]
[ECO "A18"]
[WhiteElo "2433"]
[BlackElo "2459"]
[Annotator "TA"]
[PlyCount "122"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,122,27,0,0,0,0,0,0,0,7,0,10,0,0,0,0,0,8,0,14,-20,-5,-9,-5,-110,-43,-43,-48,-86,-78,-76,-75,-85,-76,-86,-86,-89,-89,-91,-70,-63,-70,-72,-75,-73,-10,-66,-59,-72,-64,-72,-63,-91,-51,-63,-63,-93,-89,-100,-96,-98,-102,-129,-59,-94,-87,-82,-71,-75,-56,-226,-216,-229,-238,-454,-445,-558,-558,-558,-556,-558,-558,-556,-556,-549,-556,-549,-545,-516,-516,-454,-285,-1143,-1143,-1129,-1112,-898,-872,-843,-601,-1835,-1825,-29979,-5683]} 1. c4 Nf6 2. Nc3 e6 3. e4 d5 4. e5 d4 5. exf6 dxc3 6. bxc3 Qxf6 7. d4 e5 8. Nf3 exd4 9. Bg5 Qe6+ 10. Be2 Be7 11. cxd4 (11. Nxd4 {is interesting.} Qe5 12. Bxe7 Qxe7 13. O-O O-O 14. Re1) 11... Bxg5 {A18: English Opening: Flohr-Mikenas System (1 c4 Nf6 2 Nc3 e6 3 e4).} 12. Nxg5 Qg6 13. f4 (13. Nf3 {keeps more tension.} O-O 14. O-O Bh3 15. Ne1 Bf5 16. Nf3) 13... O-O {The position is equal.} 14. O-O Nc6 15. d5 Ne7 16. Qd2 h6 17. Nf3 Qd6 {[#]} 18. Ne5 $146 ({Predecessor:} 18. Rad1 c6 19. dxc6 Qxc6 20. Rfe1 Qc7 21. Qd6 Qxd6 22. Rxd6 Be6 23. Nd4 Nf5 24. Nxf5 Bxf5 {½-½ (46) Vachier Lagrave,M (2710)-Ganguly,S (2625) Melilla 2011}) 18... c6 {[%cal Rc6d5]} 19. Rad1 Rd8 20. Kh1 cxd5 21. cxd5 {[#]} Be6 $1 {[%cal Re6d5]} 22. f5 (22. Bc4 Bxd5) 22... Qxe5 (22... Bxd5 $17 23. Qb2 Qb6) 23. fxe6 $15 fxe6 {[%cal Rd8d5]} 24. d6 Nd5 25. Bg4 {Rfe1 is the strong threat.} Qxd6 26. Rfe1 {[#]} Re8 27. Qe2 {[%cal Rg4e6]} Rad8 28. Bxe6+ {[%mdl 64] Double Attack} Kh8 29. Qg4 Qb4 30. Qxb4 Nxb4 31. Rxd8 Rxd8 {[%mdl 4096] Endgame KRB-KRN} 32. Bb3 g5 (32... Nd3 $17 33. Re7 Nc5) 33. h3 ({White should play} 33. h4 $1 $11) 33... Rd7 34. Re4 Nc6 35. Re8+ Kg7 36. Kh2 Re7 37. Rc8 Nd4 38. Bd5 b6 39. Rc4 Nf5 {Strongly threatening ...Ne3.} 40. Rc8 h5 41. Rg8+ Kh6 (41... Kf6 $17 42. Bb3 Rc7 43. Rf8+ Ke5) 42. g4 hxg4 43. hxg4 Ne3 44. Bf3 Re5 45. Rf8 $2 {This costs White the game.} (45. Kg3 $15) 45... Ra5 $19 46. Kg3 Rxa2 {( -> ...Nf1+)} 47. Be4 $2 (47. Bb7 {is a better defense.}) 47... Kg7 48. Rd8 Nf1+ 49. Kf3 Nd2+ 50. Ke3 Nxe4 51. Kxe4 {KR-KR} Ra5 52. Rd7+ Kf6 53. Rb7 Ke6 54. Rg7 Kd6 55. Rg6+ Kc7 56. Rf6 $2 (56. Rg7+ Kb8 57. Rg6) 56... Rc5 57. Rf7+ Kb8 58. Rf8+ Kb7 59. Rf7+ Ka6 60. Rf5 Kb5 61. Re5 a5 {Weighted Error Value: White=0.30/Black=0.09} (61... Rxe5+ $142 62. Kxe5 a5 63. Ke4 Kc4 64. Kf5 a4 65. Kf6 a3 66. Kxg5 a2 67. Kg6 a1=Q 68. Kf5 Kd5 69. Kf4 Qe5+ 70. Kf3 Kd4 71. Kf2 Qf4+ 72. Kg2 Qxg4+ 73. Kf2 Kd3 74. Kf1 Ke3 75. Ke1 Qg1#) 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "1.2"]
[White "Lei, Tingjie"]
[Black "Nihal Sarin"]
[Result "1/2-1/2"]
[ECO "C79"]
[WhiteElo "2505"]
[BlackElo "2620"]
[Annotator "TA"]
[PlyCount "51"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 17,51,42,62,51,54,12,16,12,23,24,18,8,10,11,21,4,29,-14,-14,-14,-12,-16,6,5,7,3,4,3,8,0,7,0,6,0,3,0]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O d6 6. Re1 b5 7. Bb3 Na5 8. d4 Nxb3 9. axb3 Bb7 10. dxe5 {C79: Ruy Lopez: Steinitz-type lines with 3...a6 4 Ba4 Nf6 5 0-0 d6.} Nxe4 11. exd6 {[#]} (11. Nbd2 $5 {[%cal Rd2e4]} d5 12. c3 $14) 11... Qxd6 $146 ({Predecessor:} 11... Bxd6 12. Qd3 f5 13. Bg5 Qd7 14. Nc3 O-O 15. Rad1 Qf7 16. Nd5 Rfe8 17. c4 h6 {0-1 (37) Baglan,E (2257)-Abramovic,B (2431) Paracin 2015}) 12. Qxd6 Bxd6 13. Ng5 O-O $1 14. Nxe4 Rae8 $1 15. Nbc3 {Bg5 is the strong threat.} f5 16. f3 Bb4 {[#]} 17. Bd2 $1 {And now Nf2 would win.} fxe4 {The position is equal.} 18. fxe4 Re6 19. Rad1 Bxc3 20. Bxc3 Rxe4 21. Rxe4 Bxe4 $11 {KRB-KRB} 22. Rd7 Rf7 23. Rd8+ Rf8 24. Rd7 Rf7 25. Rd8+ Rf8 26. Rd7 {Weighted Error Value: White=0.11/Black=0.05} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "1.3"]
[White "Yip, Carissa"]
[Black "Mammadzada, Gunay"]
[Result "1/2-1/2"]
[ECO "B90"]
[WhiteElo "2430"]
[BlackElo "2443"]
[Annotator "TA"]
[PlyCount "87"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,87,27,18,16,57,67,77,74,194,199,218,191,197,116,110,76,154,112,122,54,195,33,21,23,14,0,2,7,9,-38,-43,-104,-18,-59,-58,-57,-62,-54,-50,-46,-43,-75,-72,-83,-77,-90,-65,-97,-73,-72,-63,-93,-61,-65,-45,-45,-33,-73,-74,-92,-50,-93,-69,-73,-34,-45,0,0,0,-64,0,-102,0,-58]} 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be3 e5 7. Nf3 Qc7 8. a4 Be6 9. Ng5 {B90: Sicilian Najdorf: Unusual White 6th moves, 6 Be3 Ng4 and 6 Be3 e5.} Qc6 10. Nxe6 fxe6 {[#]} 11. g4 $146 {White is better.} ({Predecessor:} 11. g3 Nxe4 12. Bg2 d5 13. Nxe4 dxe4 14. Qh5+ g6 15. Qxe5 Rg8 16. Bxe4 Qc8 17. Bxb7 Qxb7 18. Qxe6+ Qe7 19. Qxg8 Nd7 20. Qd5 Rb8 21. O-O Qe5 22. Qxe5+ Nxe5 23. Bf4 {1-0 (23) Dogan,N (2129)-Bitirgen,B (1820) Kemer 2014}) 11... Be7 (11... h6 $16 {might work better.}) 12. g5 $1 $18 {[%cal Rg5f6]} Nfd7 13. Qh5+ $1 g6 14. Qg4 ({White should play} 14. Qh6 $18) 14... Nf8 $16 15. h4 Nbd7 (15... Bd8 $142) 16. h5 Rg8 17. O-O-O (17. h6 $16) 17... O-O-O {[#]} ({Black should try} 17... gxh5 $14 18. Qxh5+ Rg6) 18. Kb1 $2 (18. Qf3 $1 $18 {[%cal Rf3f7]} gxh5 19. Qf7 (19. Qxh5 Rg7 $11)) 18... gxh5 $14 19. Qxh5 {Black must now prevent Qf7.} Rg7 20. Bh3 Kb8 21. Rhg1 Nc5 22. Bxc5 Qxc5 23. Qe2 (23. Qf3 $15) 23... Rxg5 ({Better is} 23... Bxg5 $17 24. Rg3 Qb4) 24. Rxg5 Bxg5 25. Qh5 h6 26. Qf7 Qc8 27. Rd3 Qd7 28. Qg8 Qe7 {Hoping for ...Nd7.} 29. Rf3 {[#]} Bf4 $1 30. Rd3 Nd7 31. Qg6 ({Avoid the trap} 31. Qxe6 $2 Qxe6 32. Bxe6 Nc5 $19) 31... Nc5 32. Rd1 Rc8 33. Qg4 Re8 34. Qe2 Rd8 35. Qc4 Rc8 36. Qe2 Qh4 37. Bg2 Rg8 38. Rh1 Qe7 39. Bh3 Qe8 40. Rd1 Qe7 41. Qc4 Rc8 (41... Rg6 $11) 42. Qe2 $15 Qh4 43. Bg2 Qe7 44. Bh3 $1 {Blacks defense is rewarded with a draw.  Weighted Error Value: White=0.21/Black=0.28} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "1.4"]
[White "Praggnanandhaa R"]
[Black "Murzin, Volodar"]
[Result "0-1"]
[ECO "E92"]
[WhiteElo "2608"]
[BlackElo "2478"]
[Annotator "TA"]
[PlyCount "82"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,82,35,25,44,27,56,41,26,0,22,22,17,-32,-22,-35,-73,-143,-137,-129,-130,-110,-129,-179,-187,-180,-189,-222,-223,-279,-252,-317,-344,-387,-353,-399,-374,-395,-399,-575,-450,-858,-850,-812,-808,-29981,-29982,-29978,-1245,-4214,-2716,-29970,-29971,-29972,-29972,-29972,-29974,-29974,-29975,-29988,-29989,-29995,-29996,-29997,-29998]} 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 O-O 5. h3 d6 6. Be3 e5 7. d5 Na6 8. Nf3 Nc5 9. Nd2 a5 10. g4 c6 11. Be2 a4 {E92: King's Indian: Classical: 6 Be2 e5: 7 dxe5, 7 Be3 and Petrosian System without 7...Nbd7.} 12. g5 Ne8 13. h4 f6 {[#] White is slightly better.} 14. Rg1 $146 ({Predecessor:} 14. b4 axb3 15. axb3 Rxa1 16. Qxa1 Na6 17. Qa3 c5 18. Na2 f5 19. f3 Qb6 20. Bd3 {1-0 (47) Lyrberg,P (2446)-Murzin,V (2336) Stockholm 2018}) 14... Qa5 15. Rb1 Bd7 16. h5 fxg5 17. hxg6 h6 18. Bg4 (18. Qc2 $142) 18... Bxg4 $1 $17 19. Qxg4 Nf6 20. Qg2 Nd3+ 21. Ke2 Nf4+ 22. Bxf4 exf4 23. Qh3 Rae8 24. Kd1 Qc5 25. Rf1 b5 {[%cal Bb7b5,Bb5b4][%mdl 32]} 26. Qd3 b4 27. Nxa4 Qa7 28. b3 cxd5 29. cxd5 (29. exd5 $142 Ng4 30. c5) 29... Ng4 30. Ke1 (30. f3 $142 Nf2+ 31. Rxf2 Qxf2 32. Qe2) 30... Ne5 $19 31. Qe2 Rc8 32. Nf3 Nxf3+ 33. Qxf3 Rc2 (33... Bc3+ $142 34. Nxc3 Rxc3 35. Qg4 Qxa2 {[%mdl 64] Double Attack} 36. Qd1 f3 37. Rh1 Rf4 38. Ra1 Rxe4+ 39. Kf1 {[#]} Rd3 $3 {[%mdl 512]} 40. Qe1 Rxe1+ 41. Rxe1 Rd1 $3 {[%mdl 576] Deflection, Decoy} 42. Rxd1 Qe2+ {[%mdl 64] Double Attack} 43. Kg1 Qxd1+ {[%mdl 64] Double Attack} 44. Kh2 Qd2 45. Rf1 Qf4+ 46. Kh1 Qg4 47. Kh2 Qg2#) 34. Qd3 Rfc8 35. Kd1 Rxf2 {Black mates.} 36. Re1 Be5 37. Rc1 Rxc1+ 38. Kxc1 Rxa2 39. Qb5 Ra1+ 40. Kd2 Qd4+ 41. Kc2 Ra2+ {Black took control after the opening.  Weighted Error Value: White=0.86/Black=0.27} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "1.5"]
[White "Salimova, Nurgyul"]
[Black "Abdusattorov, Nodirbek"]
[Result "0-1"]
[ECO "E17"]
[WhiteElo "2397"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "66"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,66,10,18,10,25,3,9,0,14,5,9,18,22,25,28,29,33,30,25,0,0,0,0,0,0,0,0,0,8,-35,-46,-49,-52,-82,-55,-102,-99,-106,-100,-230,-229,-334,-322,-290,-238,-364,-346,-335,-333,-308,-200,-943,-939,-930,-916]} 1. d4 Nf6 2. Nf3 e6 3. g3 b6 4. Bg2 Bb7 5. O-O Be7 6. c4 O-O 7. Re1 Na6 8. Bf4 {E17: Queen's Indian: 4 g3 Bb7 5 Bg2 Be7.} d5 9. Ne5 c5 10. Nc3 {[#] The position is equal.} cxd4 $146 ({Predecessor:} 10... Re8 11. Rc1 Ne4 12. cxd5 exd5 13. Bxe4 dxe4 14. Qb3 Rf8 15. d5 Bf6 {1-0 (67) Yakubboev,N (2575)-Khoroshev,N (2414) Tashkent 2019}) 11. Qxd4 Bc5 12. Qd1 Qe7 13. cxd5 exd5 14. Nd3 d4 {And now ...Bxg2 would win.} 15. Bxb7 Qxb7 16. Nb1 Nb4 17. Nd2 Nfd5 18. Nxc5 bxc5 19. Bd6 {[%mdl 64] Double Attack} Rfc8 20. a3 Na6 $40 {[%mdl 128] Black attacks.} 21. Nc4 (21. e4 $5 {[%cal Re4d5]} Qc6 22. Bxc5 $1 (22. exd5 Qxd6 23. Qh5 Nc7 $11) 22... Nxc5 23. exd5 Qxd5 24. Qf3 $11) 21... Nb6 22. Nxb6 axb6 23. Bf4 {[#]} Qd5 $1 24. b3 {[#]} b5 $1 25. e4 Qd7 26. a4 {This costs White the game.} (26. Rc1 $17 {might work better.}) 26... Nb4 $19 27. e5 (27. Qd2 $142) 27... bxa4 28. bxa4 d3 29. Re4 (29. e6 $142 fxe6 30. Re4) 29... Qd5 30. Qf3 Nc2 31. Rd1 Rxa4 32. Qxd3 (32. Qg4 Raa8 33. Bh6) 32... Qxd3 33. Rxd3 Rxe4 {Weighted Error Value: White=0.42/Black=0.08} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "1.6"]
[White "Saduakassova, Dinara"]
[Black "Khademalsharieh, Sarasadat"]
[Result "0-1"]
[ECO "D37"]
[WhiteElo "2500"]
[BlackElo "2494"]
[Annotator "ChessBase"]
[PlyCount "62"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:08]} a6 {[%emt 0:00:01]} 4. cxd5 {[%emt 0:00:05]} exd5 {[%emt 0:00:03]} 5. Nc3 {[%emt 0:00:07]} Nf6 {[%emt 0:00:03]} 6. Bg5 {[%emt 0:00:15]} Be6 {[%emt 0:00:22]} 7. Qb3 {[%emt 0:01:38]} Ra7 {[%emt 0:00:26]} 8. e3 {[%emt 0:00:50]} Nbd7 {[%emt 0:00:42]} 9. Bd3 {[%emt 0:00:54]} c5 {[%emt 0:00:25]} 10. dxc5 {[%emt 0:00:17]} d4 {[%emt 0:00:21]} 11. Bxf6 {[%emt 0:01:16]} gxf6 {[%emt 0:00:56]} 12. Qc2 {[%emt 0:00:07]} dxc3 {[%emt 0:00:03]} 13. Qxc3 {[%emt 0:00:06]} Nxc5 {[%emt 0:00:07]} 14. Bc2 {[%emt 0:00:11]} Ra8 {[%emt 0:00:24]} 15. Rd1 {[%emt 0:00:09]} Nd7 {[%emt 0:00:12]} 16. Nd4 {[%emt 0:00:40]} Rc8 {[%emt 0:00:15]} 17. Qd2 {[%emt 0:00:09]} Ne5 {[%emt 0:00:28]} 18. O-O {[%emt 0:00:23]} Bc5 {[%emt 0:00:34]} 19. b4 {[%emt 0:00:40]} Bxd4 {[%emt 0:00:15]} 20. exd4 {[%emt 0:00:02]} Ng6 {[%emt 0:00:40]} 21. d5 {[%emt 0:00:17]} Bd7 {[%emt 0:00:23]} 22. Rfe1+ {[%emt 0:00:02]} Kf8 {[%emt 0:00:01]} 23. Qh6+ {[%emt 0:00:06]} Kg8 {[%emt 0:00:01]} 24. Bb3 {[%emt 0:00:02]} Qf8 {[%emt 0:00:06]} 25. Qe3 {[%emt 0:00:08]} Qd6 {[%emt 0:00:12]} 26. Qh6 {[%emt 0:00:19]} Qf8 {[%emt 0:00:34]} 27. Qe3 {[%emt 0:00:14]} Qxb4 {[%emt 0:00:05]} 28. d6 {[%emt 0:00:04]} Kg7 {[%emt 0:00:10]} 29. Rd4 {[%emt 0:01:31]} Qc5 {[%emt 0:00:40]} 30. Red1 {[%emt 0:00:08]} Rhe8 {[%emt 0:00:04]} 31. Qd2 {[%emt 0:00:14]} Qc3 {[%emt 0:00:03]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "1.7"]
[White "Liang, Awonder"]
[Black "Abdumalik, Zhansaya"]
[Result "0-1"]
[ECO "C85"]
[WhiteElo "2592"]
[BlackElo "2472"]
[Annotator "TA"]
[PlyCount "92"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 14,92,18,8,23,24,23,12,21,3,3,-12,-12,-19,0,-8,0,-29,-31,-62,-49,-58,0,-4,0,-26,-20,-152,-128,-238,-235,-244,-223,-239,-230,-240,-227,-311,-301,-312,-213,-244,-236,-224,-255,-231,-257,-254,-241,-286,-284,-233,-166,-420,-393,-862,-825,-885,-891,-2420,-5206,-5247,-2368,-2295,-2122,-1837,-1508,-1750,-1753,-1650,-1666,-29971,-29972,-29971,-29970,-29964,-29951,-6127,-6548,-5143,-4694]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Bxc6 dxc6 7. d3 Bd6 8. Nbd2 O-O {C85: Closed Ruy Lopez: Deferred Exchange Variation.} 9. Nc4 Nd7 10. Be3 Re8 {[#] The position is equal.} 11. Nfd2 $146 ({Predecessor:} 11. a4 c5 12. Nfd2 Nf8 13. a5 Be6 14. Nxd6 cxd6 15. Nc4 Qc7 16. Nb6 Rad8 17. c4 {1-0 (49) Paravyan,D (2540)-Mikaelyan,A (2432) Yerevan 2017}) 11... Nf8 12. Kh1 Ng6 13. Qh5 Nf4 14. Bxf4 exf4 15. Rae1 Bf8 16. e5 b5 17. Na5 Qd4 ({Black should try} 17... Be6 $15) 18. Nf3 $11 (18. Nxc6 Qxb2 19. Nf3 h6 $17) 18... Qd5 19. Re4 ({Reject} 19. c4 Qxd3 20. Rd1 Qg6 $17) 19... Qxa2 ({Don't do} 19... g6 20. Qh4 $17) 20. Nxc6 {Black keeps a firm grip on the game.} (20. Rxf4 $11 g6 21. Qh4) 20... Bb7 21. Ng5 h6 $19 22. e6 {[#]} g6 $1 ({Inferior is} 22... hxg5 23. Qxf7+ Kh7 24. Qh5+ Kg8 25. Qf7+ Kh7 26. Qh5+ Kg8 27. Qf7+ $11) 23. exf7+ {[#]} Qxf7 $1 {[%mdl 512]} 24. Nxf7 gxh5 25. Nfe5 Bg7 26. Ree1 a5 {[%cal Ba6a5,Ba5a4][%mdl 32]} 27. d4 Ra6 28. d5 a4 29. c3 Bxe5 30. Nxe5 Bxd5 31. Nd3 Rxe1 32. Rxe1 {[%mdl 4096] Endgame KRB-KRN} f3 33. g3 $2 (33. gxf3 a3 34. bxa3) 33... Bc4 34. Nf4 (34. Re8+ Kg7 35. Ne5) 34... Rd6 35. h4 Rd2 {[%mdl 64] Double Attack} 36. Re7 Rxf2 37. Nxh5 Rxb2 38. Rd7 Bf7 39. Rd8+ Kh7 {( -> ...Rb1+)} 40. Rd7 Kg6 {Threatens to win with ...Rb1+.} 41. Nf4+ Kf6 {White must now prevent ...Rb1+.} 42. g4 Rb1+ 43. Kh2 f2 44. g5+ hxg5 45. hxg5+ Kg7 46. Nh5+ Kf8 {Weighted Error Value: White=0.78/Black=0.10} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "1.8"]
[White "Yoo, Christopher Woojin"]
[Black "Mendonca, Leon Luke"]
[Result "1-0"]
[ECO "B90"]
[WhiteElo "2455"]
[BlackElo "2549"]
[Annotator "TA"]
[PlyCount "167"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,167,31,32,-7,-2,-58,22,0,13,0,9,-91,-29,-69,14,0,40,0,0,0,110,108,118,108,140,127,164,24,99,54,68,24,24,18,20,19,12,-29,46,-27,-9,-26,-14,-31,-28,-27,-22,-22,-18,-33,-2,-84,-78,-80,-37,-173,-4,-56,145,143,141,136,153,153,154,154,162,173,164,170,275,253,238,166,155,154,155,152,237,152,155,146,210,224,182,109,140,0,89,92,104,0,175,165,170,185,194,152,200,162,239,238,350,0,183,0,317,169,202,196,209,188,251,0,161,0,253,249,249,239,288,285,302,237,245,188,239,200,170,0,221,184,219,215,339,339,340,381,309,391,389,390,392,392,373,356,343,292,255,224,558,564,898,895,870,852,1076,1031,1263,1247]} 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Qe2 {B90: Sicilian Najdorf: Unusual White 6th moves, 6 Be3 Ng4 and 6 Be3 e5.} e5 7. Nf5 (7. Nb3 $11) 7... g6 (7... d5 $1 $15) 8. Nh6 $11 {The position is equal.} Be6 9. Bg5 {[#]} Nbd7 $146 ({Predecessor:} 9... Be7 10. Qd2 Nbd7 11. Bd3 Nc5 12. h4 Rc8 13. O-O Nh5 14. g3 Bxg5 15. hxg5 f6 16. gxf6 Nxd3 {1-0 (27) Skytte,R (2402)-Teplyi,I (2433) Aarhus 2016}) 10. g3 {[#]} (10. Qf3 $11) 10... Rc8 (10... Qb6 $1 $17 {[%cal Rb6b2]} 11. O-O-O Qa5) 11. Bg2 Be7 (11... Qb6 $15 12. O-O-O Qa5) 12. O-O Qb6 13. Rab1 Bc4 14. Qf3 $36 {[%mdl 2048] White has some pressure.} Kf8 (14... Bxf1 $11 {keeps the balance.} 15. Rxf1 Rf8) 15. Bh3 $16 Qd8 16. Rfd1 Be6 17. Bxe6 fxe6 18. Ng4 ({Only move:} 18. Bxf6 $18 Nxf6 19. g4) 18... Kg7 (18... Rc6 $1 $11 {remains equal.}) 19. Bh6+ Kf7 20. Rd2 Rc6 21. Rbd1 Qb6 22. Nxf6 Nxf6 23. b3 Rhc8 (23... Qc7 $11 24. Rd3 Rc8) 24. Rd3 (24. Na4 $14 Qc7 25. c4) 24... Kg8 (24... Qc7 {seems wilder.} 25. Bd2 Kg8 26. h4 b5 27. a3 h5) 25. Bg5 Rf8 {Threatens to win with ...Nxe4!} 26. Qe2 Qc7 27. Bd2 b5 28. a3 Qb6 29. Rf3 Kg7 30. b4 (30. a4 $11) 30... Rc4 $17 31. Bg5 Qc6 32. Qd2 (32. Qe3 $15) 32... Rd4 $2 (32... Nxe4 $19 33. Bh6+ Kg8 34. Rxf8+ Bxf8 35. Nxe4 Rd4 36. Nf6+ Kf7) 33. Rd3 (33. Qe3 $1 $11) 33... Rc4 $2 (33... Rc8 $15 {keeps the upper hand.} 34. Qe1 (34. Rxd4 exd4 35. Nb1 Qxe4 $17) 34... Rc4 35. Bxf6+ Kxf6 36. Rf3+ Kg7) 34. Bh6+ $16 {[%mdl 64] [#] Skewer} Kg8 {Hoping for ...Rc8.} 35. Bxf8 Kxf8 36. Re1 Kg7 37. Re2 h6 38. f3 Nd7 39. Nd1 Qc8 (39... Qb6+ $142 40. Ne3 Nf6) 40. Ne3 $18 Rc6 41. h4 h5 42. Re1 Nb6 43. Rd1 Qf8 (43... Kh7 $16 44. Rf1 Qe8) 44. Qf2 Na4 45. R1d2 Nb2 (45... Qf7 $16 46. c3 Qf8) 46. Rb3 Na4 47. Ng2 (47. f4 $18) 47... Bd8 48. Ne3 (48. Qa7+ $16 Qf7 49. Qxf7+ Kxf7 50. Kf1) 48... Bb6 (48... Be7 $1 $11) 49. Kg2 $16 Bd4 50. Rbd3 (50. f4 $16) 50... Bb6 $2 (50... Bc3 $1 $11 {and Black has nothing to worry.}) 51. Qe2 Nb2 52. Rb3 Na4 53. Nd1 Bd8 54. Rbd3 Nb6 (54... Be7 $142 55. c3 Kg8) 55. Ne3 $18 Na4 (55... Be7 $142 56. c3 Qf6) 56. Qf2 (56. c4 $142) 56... Bb6 57. Qe2 $2 ({White should try} 57. c3 $18) 57... Bd8 $2 {[%mdl 8192]} (57... Nb2 $11) 58. Qe1 (58. c4 $142) 58... Bb6 59. Nd1 Ba7 60. Qe2 Bb6 (60... Bb8 $142 61. c3 Nb6) 61. Rb3 $2 (61. c3 $18) 61... Bd4 $2 (61... Bd8 $1 $11 {and Black stays safe.}) 62. Rbd3 (62. Qd3 $142) 62... Bb6 $1 63. c3 Ba7 64. Rc2 Qc8 65. Qd2 Qc7 66. Nb2 Nb6 67. Qe2 Qc8 (67... d5 {was worth a try.} 68. Qd1 Bb8) 68. Rcd2 Bb8 69. Qe3 $2 (69. Qd1 $18) 69... Qf8 $2 (69... Nc4 $1 $11 70. Qg5 (70. Nxc4 $2 bxc4 71. Qg5 cxd3 $19) 70... Nxd2 71. Qxd2 Bc7) 70. Rf2 Ba7 {intending ...Nc8.} 71. Qe1 Bb8 (71... Qe7 $142 72. Re2 Qb7) 72. f4 exf4 73. Rxf4 ({Less strong is} 73. gxf4 d5 $16) 73... Qe7 74. Rdf3 {Qf2 is the strong threat.} Nd7 75. Nd3 e5 76. Rf7+ $1 Qxf7 77. Rxf7+ Kxf7 78. Qe3 Nf6 79. Nf2 Ke6 $2 (79... Bc7 {is tougher.} 80. Qd3 Ke7) 80. Qh6 {White is clearly winning.} Kf7 {If Black can now play ...Bc7 this consolidates a bit.} 81. Nh3 Nxe4 82. Qh7+ Ke6 83. Qxg6+ {[%mdl 64] Double Attack} Nf6 84. Ng5+ {Weighted Error Value: White=0.47/Black=0.50} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "1.9"]
[White "Shuvalova, Polina"]
[Black "Keymer, Vincent"]
[Result "0-1"]
[ECO "E20"]
[WhiteElo "2476"]
[BlackElo "2591"]
[Annotator "TA"]
[PlyCount "72"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,72,-2,-8,-13,16,11,34,-224,-224,-222,-214,-213,-212,-227,-200,-241,-232,-232,-230,-221,-216,-281,-216,-309,-300,-347,-311,-376,-368,-380,-387,-460,-409,-397,-397,-568,-561,-549,-548,-587,-578,-731,-733,-789,-758,-840,-817,-851,-862,-940,-922,-1070,-1062,-1086,-1097,-1087,-1088,-1833,-1378,-1538,-1509]} 1. d4 {Krasenkow,M} Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Nc3 O-O 6. Bg2 dxc4 7. O-O Nc6 {[%cal Bb8c6,Bc6d4,Bd4b3][%mdl 32]} 8. Qa4 {E20: Nimzo-Indian: 4 g3 and 4 f3.} Bd7 9. Bg5 a5 {[#]} 10. a3 $146 {[%mdl 8192] [#]} (10. Bxf6 $14 {stays ahead.} gxf6 11. Qc2) ({Predecessor:} 10. Bxf6 Qxf6 11. a3 Bxc3 12. bxc3 Qd8 13. Qxc4 a4 14. Nd2 Na5 15. Qb4 Ra7 16. Rab1 {1-0 (30) Caruana,F (2822)-Karjakin,S (2773) Saint Louis 2018 CBM 186 [Krasenkow,M]}) 10... Nxd4 $1 $19 {[%mdl 512]} 11. Qd1 Bxc3 12. bxc3 Nb3 13. Ne5 {Black must now prevent Bxf6.} Bb5 ({Weaker is} 13... Nxa1 14. Bxf6 Qxf6 15. Nxd7 $17) 14. Rb1 Qxd1 15. Rfxd1 {[#]} Nd5 {[%cal Rd5c3]} 16. Bxd5 exd5 17. Bf4 c6 18. Nd7 (18. Nf3 $142) 18... Rfe8 19. Kf1 f6 20. Nb6 Ra6 21. Bc7 {White hopes to continue with a4.} a4 22. f3 Kf7 23. e4 d4 24. Rb2 (24. Rxd4 $142 Nxd4 25. cxd4) 24... Re7 {Black is clearly winning.} 25. Bd8 Re6 26. Kf2 d3 27. f4 Ke8 28. Bc7 Re7 29. Bd6 Rxb6 30. Bxe7 Kxe7 31. Ke3 c5 32. g4 Re6 33. e5 fxe5 34. f5 Rh6 {...Rh3+ is the strong threat.} 35. Rg1 d2 36. Ke4 Rxh2 {Black took control after the opening.  Weighted Error Value: White=0.68/Black=0.07} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "1.10"]
[White "Bjerre, Jonas Buhl"]
[Black "Gukesh D"]
[Result "1-0"]
[ECO "E04"]
[WhiteElo "2550"]
[BlackElo "2578"]
[Annotator "ChessBase"]
[PlyCount "35"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:05]} 3. Nf3 {[%emt 0:00:02]} Nf6 {[%emt 0:00:02]} 4. g3 {[%emt 0:00:02]} dxc4 {[%emt 0:00:08]} 5. Bg2 {[%emt 0:00:03]} a6 {[%emt 0:00:02]} 6. Ne5 {[%emt 0:00:11]} Bb4+ {[%emt 0:00:15]} 7. Nc3 {[%emt 0:00:04]} Nd5 {[%emt 0:00:04]} 8. O-O {[%emt 0:00:31]} O-O {[%emt 0:00:10]} 9. Ne4 {[%emt 0:00:20]} b5 {[%emt 0:02:11]} 10. b3 {[%emt 0:00:07]} Bb7 {[%emt 0:02:31]} 11. bxc4 {[%emt 0:01:15]} Nc3 {[%emt 0:02:28]} 12. Qc2 {[%emt 0:01:56]} Qxd4 {[%emt 0:02:19]} 13. Ng5 {[%emt 0:01:23]} Nxe2+ {[%emt 0:00:13]} 14. Qxe2 {[%emt 0:01:27]} Bxg2 {[%emt 0:00:02]} 15. Kxg2 {[%emt 0:00:56]} Qxa1 {[%emt 0:00:20]} 16. Bb2 {[%emt 0:00:27]} Qxa2 {[%emt 0:00:05]} 17. Qc2 {[%emt 0:00:44]} f5 {[%emt 0:00:21]} 18. Ra1 {[%emt 0:00:09]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "2.1"]
[White "Zhu, Jiner"]
[Black "Gukesh D"]
[Result "0-1"]
[ECO "B12"]
[WhiteElo "2459"]
[BlackElo "2578"]
[Annotator "ChessBase"]
[PlyCount "98"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 2. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 3. e5 {[%emt 0:00:00]} Bf5 {[%emt 0:00:00]} 4. Nf3 {[%emt 0:00:00]} e6 {[%emt 0:00:07]} 5. Be2 {[%emt 0:00:01]} Ne7 {[%emt 0:00:15]} 6. O-O {[%emt 0:00:07]} Nd7 {[%emt 0:00:02]} 7. c3 {[%emt 0:00:16]} Ng6 {[%emt 0:00:30]} 8. Ne1 {[%emt 0:01:32]} h5 {[%emt 0:00:03]} 9. Be3 {[%emt 0:00:14]} f6 {[%emt 0:01:16]} 10. Bxh5 {[%emt 0:01:44]} fxe5 {[%emt 0:00:04]} 11. Bxg6+ {[%emt 0:00:43]} Bxg6 {[%emt 0:00:03]} 12. dxe5 {[%emt 0:00:03]} Nxe5 {[%emt 0:00:41]} 13. Bd4 {[%emt 0:00:40]} Nd7 {[%emt 0:02:14]} 14. Qe2 {[%emt 0:00:56]} Qe7 {[%emt 0:00:29]} 15. Nd3 {[%emt 0:00:44]} Bxd3 {[%emt 0:02:37]} 16. Qxd3 {[%emt 0:00:03]} e5 {[%emt 0:00:33]} 17. Qg6+ {[%emt 0:00:50]} Qf7 {[%emt 0:00:06]} 18. Qxf7+ {[%emt 0:00:01]} Kxf7 {[%emt 0:00:01]} 19. Be3 {[%emt 0:00:01]} Bd6 {[%emt 0:00:08]} 20. Nd2 {[%emt 0:00:41]} Kg6 {[%emt 0:00:38]} 21. h3 {[%emt 0:00:06]} Rae8 {[%emt 0:00:09]} 22. Rad1 {[%emt 0:00:04]} Bc5 {[%emt 0:00:31]} 23. Ne4 {[%emt 0:00:43]} Bxe3 {[%emt 0:00:06]} 24. fxe3 {[%emt 0:00:02]} Re7 {[%emt 0:00:16]} 25. Ng3 {[%emt 0:00:13]} Nc5 {[%emt 0:00:14]} 26. e4 {[%emt 0:00:42]} Rd8 {[%emt 0:00:22]} 27. exd5 {[%emt 0:00:54]} cxd5 {[%emt 0:00:03]} 28. Rfe1 {[%emt 0:00:03]} Rdd7 {[%emt 0:00:03]} 29. Re2 {[%emt 0:00:04]} e4 {[%emt 0:00:13]} 30. Rf1 {[%emt 0:00:36]} Re5 {[%emt 0:00:29]} 31. Re3 {[%emt 0:00:08]} Rf7 {[%emt 0:00:08]} 32. Ne2 {[%emt 0:00:04]} Rxf1+ {[%emt 0:00:01]} 33. Kxf1 {[%emt 0:00:00]} Nd3 {[%emt 0:00:02]} 34. b3 {[%emt 0:00:06]} Kf6 {[%emt 0:00:05]} 35. Nd4 {[%emt 0:00:02]} Re7 {[%emt 0:00:06]} 36. g3 {[%emt 0:00:04]} Ke5 {[%emt 0:00:04]} 37. Ke2 {[%emt 0:00:17]} Rf7 {[%emt 0:00:03]} 38. Kd2 {[%emt 0:00:09]} Rf1 {[%emt 0:00:08]} 39. a4 {[%emt 0:00:07]} Rh1 {[%emt 0:00:04]} 40. h4 {[%emt 0:00:01]} Rh2+ {[%emt 0:00:08]} 41. Re2 {[%emt 0:00:02]} Rh1 {[%emt 0:00:03]} 42. Re3 {[%emt 0:00:01]} a6 {[%emt 0:00:02]} 43. Re2 {[%emt 0:00:04]} g6 {[%emt 0:00:07]} 44. Re3 {[%emt 0:00:02]} Kd6 {[%emt 0:00:02]} 45. Re2 {[%emt 0:00:04]} Rg1 {[%emt 0:00:02]} 46. Re3 {[%emt 0:00:05]} Rg2+ {[%emt 0:00:01]} 47. Ne2 {[%emt 0:00:01]} Ne5 {[%emt 0:00:11]} 48. c4 {[%emt 0:00:23]} Ng4 {[%emt 0:00:08]} 49. c5+ {[%emt 0:00:18]} Ke5 {[%emt 0:00:08]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "2.2"]
[White "Keymer, Vincent"]
[Black "Bjerre, Jonas Buhl"]
[Result "1-0"]
[ECO "D38"]
[WhiteElo "2591"]
[BlackElo "2550"]
[Annotator "ChessBase"]
[PlyCount "87"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 4. Nc3 {[%emt 0:00:00]} Bb4 {[%emt 0:00:01]} 5. Qa4+ {[%emt 0:00:04]} Nc6 {[%emt 0:00:03]} 6. e3 {[%emt 0:00:00]} O-O {[%emt 0:00:09]} 7. Bd2 {[%emt 0:00:03]} dxc4 {[%emt 0:00:25]} 8. Bxc4 {[%emt 0:00:00]} Bd6 {[%emt 0:00:02]} 9. Qc2 {[%emt 0:00:03]} e5 {[%emt 0:00:22]} 10. dxe5 {[%emt 0:00:14]} Nxe5 {[%emt 0:00:03]} 11. Nxe5 {[%emt 0:00:00]} Bxe5 {[%emt 0:00:01]} 12. O-O {[%emt 0:00:01]} c6 {[%emt 0:01:09]} 13. h3 {[%emt 0:00:39]} Nd5 {[%emt 0:01:51]} 14. Ne2 {[%emt 0:02:37]} Qf6 {[%emt 0:01:47]} 15. Bxd5 {[%emt 0:00:13]} cxd5 {[%emt 0:00:18]} 16. Bc3 {[%emt 0:00:01]} Bf5 {[%emt 0:00:33]} 17. Bxe5 {[%emt 0:00:05]} Qxe5 {[%emt 0:00:06]} 18. Qc3 {[%emt 0:00:01]} Qd6 {[%emt 0:00:29]} 19. Rac1 {[%emt 0:00:47]} Rac8 {[%emt 0:00:10]} 20. Qd4 {[%emt 0:00:12]} Qa6 {[%emt 0:00:16]} 21. Nc3 {[%emt 0:00:51]} Be6 {[%emt 0:00:32]} 22. Rfd1 {[%emt 0:00:37]} Rc4 {[%emt 0:00:10]} 23. Qd3 {[%emt 0:00:02]} Rfc8 {[%emt 0:00:28]} 24. b3 {[%emt 0:00:28]} R4c7 {[%emt 0:01:01]} 25. Qxa6 {[%emt 0:00:30]} bxa6 {[%emt 0:00:01]} 26. Ne2 {[%emt 0:00:10]} Rc2 {[%emt 0:00:02]} 27. Kf1 {[%emt 0:01:20]} a5 {[%emt 0:00:37]} 28. a3 {[%emt 0:00:26]} g6 {[%emt 0:00:15]} 29. Rxc2 {[%emt 0:00:14]} Rxc2 {[%emt 0:00:02]} 30. Nd4 {[%emt 0:00:00]} Rc3 {[%emt 0:00:22]} 31. Ke1 {[%emt 0:00:17]} a4 {[%emt 0:00:26]} 32. Kd2 {[%emt 0:00:04]} Rc7 {[%emt 0:00:14]} 33. b4 {[%emt 0:00:02]} Kf8 {[%emt 0:00:33]} 34. Rc1 {[%emt 0:00:02]} Rxc1 {[%emt 0:00:03]} 35. Kxc1 {[%emt 0:00:00]} Bd7 {[%emt 0:00:02]} 36. Kd2 {[%emt 0:00:12]} Ke7 {[%emt 0:00:03]} 37. Kc3 {[%emt 0:00:07]} Kd6 {[%emt 0:00:01]} 38. Nf3 {[%emt 0:00:15]} f6 {[%emt 0:00:05]} 39. Kd4 {[%emt 0:00:02]} Bb5 {[%emt 0:00:04]} 40. h4 {[%emt 0:00:07]} Bf1 {[%emt 0:00:10]} 41. g3 {[%emt 0:00:02]} Be2 {[%emt 0:00:01]} 42. Nd2 {[%emt 0:00:12]} a6 {[%emt 0:00:16]} 43. e4 {[%emt 0:01:04]} dxe4 {[%emt 0:00:22]} 44. Nxe4+ {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "2.3"]
[White "Mendonca, Leon Luke"]
[Black "Shuvalova, Polina"]
[Result "1/2-1/2"]
[ECO "D41"]
[WhiteElo "2549"]
[BlackElo "2476"]
[Annotator "TA"]
[PlyCount "202"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 26,202,18,0,0,0,30,0,0,-45,-36,-76,-30,-100,-66,-89,-45,-116,-45,-56,-14,-49,0,0,244,141,138,140,127,129,170,14,3,-11,-38,-94,-91,-104,-50,-51,-20,-15,1006,0,38,34,24,23,32,-11,-12,-127,-98,-99,-103,-102,-100,-110,-102,-97,-77,-152,-104,-104,-108,-103,0,-20,-12,-80,0,0,0,-4,58,0,0,0,0,-17,0,0,2,2,48,48,48,48,48,26,26,4,4,4,97,97,306,277,156,2,2,2,2,0,0,0,2,2,2,2,2,2,2,2,2,2,2,0,2,0,0,0,0,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,109,2,2,2,9,9,9,9,9,9,9,9,9,9,9,2,9,0,9,9,9,9,9,9,9,9,9,0,9,0,0,0,0,0,0]} 1. d4 {Tsesarsky,I} Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 c5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 cxd4 8. cxd4 Bb4+ 9. Bd2 Bxd2+ 10. Qxd2 O-O 11. Bc4 Nd7 12. O-O b6 13. Rfe1 Bb7 14. Rad1 Rc8 {D41: Queen's Gambit Declined: Semi-Tarrasch with 5 cxd5.} 15. Bd3 Re8 16. h4 h6 {[#]} 17. d5 $146 ({Predecessor:} 17. Bb5 Re7 18. Bxd7 Rxd7 19. Ne5 Rdc7 20. Qf4 Qd6 21. Qg4 Rc2 22. Qh5 R8c7 23. Ng4 Rxa2 {1-0 (50) Mamedyarov,S (2607)-Marcelin,C (2503) Istanbul 2003 CBM 096 [Tsesarsky,I]}) 17... exd5 18. e5 Nc5 19. Bf5 (19. Nd4 $11 {keeps the balance.}) 19... Rc7 20. h5 Rce7 21. Bb1 (21. Qf4 $15) 21... Qc8 (21... d4 $17 22. Nxd4 Rxe5 23. Rxe5 Rxe5) 22. Qf4 $15 Ne4 23. Rc1 Qd7 (23... Qd8 {feels hotter.} 24. Bd3 Nc5 25. Bb5 Rf8 26. Nd4 a6) 24. Nd4 Rc8 $2 (24... Rxe5 $11 25. f3 Qa4 $1) 25. f3 (25. Bxe4 $18 dxe4 26. Nf5 Rxc1 27. Rxc1 (27. Nxe7+ Qxe7 28. Rxc1 Qd7 $16)) 25... Rxc1 26. Rxc1 Ng5 27. Nf5 $1 {[%mdl 1024] White has strong compensation.} Re8 28. Qd4 $2 (28. Qg4 $1 $18 Kf8 29. f4) 28... Rc8 $1 $132 {[%cal Rc8c1][%mdl 2048] Black is not keeping still} 29. Re1 Rc4 30. Qd3 (30. Qd2 $15) 30... Qc7 $17 31. Kh2 Rc3 (31... Qc5 $1 $17 32. Qd2 Rc3) 32. Qb5 $15 {Qe8+ would kill now.} Bc6 33. Qb4 Rc4 $2 {[%mdl 8192]} (33... Rc5 $11) 34. Qd6 $2 (34. Ne7+ $1 $18 Kf8 35. Ng6+ {[%mdl 64] Discovered Attack (Double check)} Ke8 36. Qf8+ {[%mdl 64] Double Attack} Kd7 37. Bf5+ Ne6 38. Qxf7+ Kc8 39. Ne7+ Kb7 40. Qxe6) 34... Qxd6 35. exd6 Ne6 $1 36. Ne7+ $1 Kf8 37. Bf5 (37. Ng6+ $5 Ke8 38. f4 fxg6 39. Rxe6+ Kd7 40. Rxg6 Rxf4 41. Rxg7+ Kxd6 42. Rg6+ {[%mdl 64] Double Attack} Kc5 43. Rxh6 $14) 37... Bd7 38. Nxd5 (38. Ng6+ $1 $11 {remains equal.} Ke8 39. Ne5) 38... Rh4+ 39. Kg3 Rxh5 40. Bxe6 fxe6 $17 {[%mdl 4096] Endgame KRB-KRN} ({But not} 40... Bxe6 $6 41. Nf4 $11) 41. Nf4 Rg5+ 42. Kh2 Kf7 43. Nd3 ({Better is} 43. Rc1) 43... Kf6 44. Rc1 Rd5 45. Nf2 Ba4 (45... e5 $17 46. Rc7 Ke6 47. Rxa7 Kxd6 48. Ne4+ Kc6) 46. Rc7 a5 47. Ne4+ {[#]} (47. Rb7 $1 $11) 47... Kg6 ({Black should play} 47... Ke5 $1 $17) 48. Re7 e5 (48... Rd3 {is more complex.} 49. Rxe6+ Kf5 50. Re7 Bc6 51. Rxg7 Bxe4 52. fxe4+ Kxe4 53. Rg6 h5) 49. Rb7 b5 (49... Bc2 $11 50. Rxb6 Bxe4 51. fxe4 Rd4) 50. Rb6 (50. d7 $14 b4 {[#]} 51. Nc5 $1 Bxd7 52. Nxd7) 50... Kf7 51. Nc3 Rd4 52. Nxb5 (52. Ra6 {keeps more tension.} Ke6 53. Rxa5 Rxd6 54. Nxa4 bxa4 55. Rxa4 Kf6 56. Kg3) 52... Bxb5 (52... Rb4 {is more complex.} 53. Rb7+ Kf6 54. d7 Ke7 55. d8=R+ Kxd8 56. Nd6 Rd4) 53. Rxb5 {[%mdl 64] Double Attack} Rxd6 (53... Kf6 {seems wilder.} 54. Rxa5 Rxd6 55. a4 Rd4 56. Kg3 e4) 54. Rxe5 $11 {KR-KR} Ra6 (54... a4 $5 {[%cal Rd6d2]}) 55. a4 Kf6 56. Rb5 g5 57. Kg3 h5 58. Kf2 h4 59. Kg1 Kg6 (59... Rd6 $11) 60. Kh2 $16 Kh5 $2 (60... Ra7 $16) 61. Kh3 $18 Rc6 (61... Kh6 $18 62. Kg4 Rd6) 62. f4 $2 (62. Rxa5 $16 {Strongly threatening Ra8.} Rc3 63. Kh2) 62... Rc3+ $11 63. Kh2 Kg4 $1 64. Rxg5+ Kxf4 65. Rxa5 Ra3 66. Ra8 Kg5 67. a5 Kg6 68. a6 Kg7 69. Kg1 Ra2 70. Kf1 (70. a7 {looks sharper.} Ra4 71. Kh2 Kh7 72. Rb8 Rxa7 73. Rb4) 70... Kh7 71. a7 Kg7 72. Ke1 Kh7 73. Kd1 Kg7 74. Kc1 Kh7 75. Kb1 Ra6 76. Kb2 {Hoping for Kc3.} Kg7 77. Kc3 Ra4 78. Kb3 Ra1 79. Kc4 {And now Kb4 would win.} Kh7 80. Kd5 Ra5+ 81. Ke6 {aiming for Kd6.} Ra1 82. Kf5 {Black must now prevent Kf6.} Ra5+ 83. Kg4 Ra4+ $1 84. Kh5 {Threatens to win with Kg5.} Kg7 85. Rc8 (85. Kg5 $16) 85... Rxa7 {The position is equal.} 86. Kxh4 Ra5 87. Rc6 Rb5 88. Re6 Ra5 89. Kg4 Ra2 90. g3 Ra5 91. Kf4 Ra4+ 92. Kf5 (92. Kg5 {with more complications.} Ra5+ 93. Kh4 Ra4+ 94. g4 Ra1 95. Kh5) 92... Ra5+ 93. Re5 (93. Kg4 {keeps more tension.} Ra1 94. Rd6 Ra4+ 95. Kg5 Ra5+ 96. Kh4) 93... Ra7 94. Kg5 Rb7 95. g4 Ra7 96. Kh5 $1 Rb7 (96... Ra6 {feels hotter.} 97. Re7+ Kg8 98. Rc7 Re6 99. g5 Rb6) 97. g5 Ra7 98. Rf5 Rb7 99. g6 Ra7 100. Rf7+ Rxf7 101. gxf7 Kxf7 {Weighted Error Value: White=0.32/Black=0.35} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "2.4"]
[White "Abdumalik, Zhansaya"]
[Black "Yoo, Christopher Woojin"]
[Result "1/2-1/2"]
[ECO "B40"]
[WhiteElo "2472"]
[BlackElo "2455"]
[Annotator "ChessBase"]
[PlyCount "84"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:00]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:01]} Bb4 {[%emt 0:00:02]} 6. Bd3 {[%emt 0:00:40]} d6 {[%emt 0:00:04]} 7. O-O {[%emt 0:00:06]} O-O {[%emt 0:00:21]} 8. Nce2 {[%emt 0:00:39]} e5 {[%emt 0:01:00]} 9. Nb3 {[%emt 0:00:14]} d5 {[%emt 0:00:32]} 10. exd5 {[%emt 0:00:22]} Nxd5 {[%emt 0:02:11]} 11. Ng3 {[%emt 0:01:04]} Nc6 {[%emt 0:00:36]} 12. c3 {[%emt 0:00:13]} Be7 {[%emt 0:00:08]} 13. Nf5 {[%emt 0:00:40]} Bg5 {[%emt 0:02:19]} 14. Qh5 {[%emt 0:00:33]} h6 {[%emt 0:00:23]} 15. Bxg5 {[%emt 0:01:00]} Qxg5 {[%emt 0:00:03]} 16. Qxg5 {[%emt 0:00:01]} hxg5 {[%emt 0:00:00]} 17. Nd6 {[%emt 0:00:02]} Rd8 {[%emt 0:00:41]} 18. Nxc8 {[%emt 0:00:11]} Raxc8 {[%emt 0:00:00]} 19. Rfd1 {[%emt 0:00:15]} Nce7 {[%emt 0:00:08]} 20. Be4 {[%emt 0:00:38]} f5 {[%emt 0:00:08]} 21. Bxd5+ {[%emt 0:00:06]} Nxd5 {[%emt 0:00:14]} 22. Re1 {[%emt 0:00:03]} e4 {[%emt 0:00:44]} 23. Nd4 {[%emt 0:00:16]} g6 {[%emt 0:00:03]} 24. Ne6 {[%emt 0:00:13]} Rd6 {[%emt 0:00:03]} 25. Nxg5 {[%emt 0:00:03]} Nf4 {[%emt 0:00:02]} 26. g3 {[%emt 0:00:35]} Nd3 {[%emt 0:00:02]} 27. Re2 {[%emt 0:00:01]} Rb6 {[%emt 0:00:11]} 28. f3 {[%emt 0:00:44]} exf3 {[%emt 0:00:14]} 29. Nxf3 {[%emt 0:00:02]} Nxb2 {[%emt 0:00:37]} 30. Rb1 {[%emt 0:00:08]} Na4 {[%emt 0:00:43]} 31. Rxb6 {[%emt 0:00:05]} axb6 {[%emt 0:00:04]} 32. Nh4 {[%emt 0:00:05]} Kf7 {[%emt 0:00:09]} 33. Rd2 {[%emt 0:00:09]} Nc5 {[%emt 0:00:03]} 34. Nf3 {[%emt 0:00:21]} Ke7 {[%emt 0:00:10]} 35. Re2+ {[%emt 0:00:24]} Kf6 {[%emt 0:00:06]} 36. Rb2 {[%emt 0:00:32]} Rc6 {[%emt 0:00:14]} 37. c4 {[%emt 0:00:05]} Ne4 {[%emt 0:00:17]} 38. Kg2 {[%emt 0:00:03]} Nd6 {[%emt 0:00:05]} 39. Nd2 {[%emt 0:00:10]} Ke5 {[%emt 0:00:05]} 40. Nf3+ {[%emt 0:00:22]} Kf6 {[%emt 0:00:10]} 41. Nd2 {[%emt 0:00:02]} Ke5 {[%emt 0:00:06]} 42. Nf3+ {[%emt 0:00:02]} Kf6 {[%emt 0:00:12]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "2.5"]
[White "Khademalsharieh, Sarasadat"]
[Black "Liang, Awonder"]
[Result "0-1"]
[ECO "E65"]
[WhiteElo "2494"]
[BlackElo "2592"]
[Annotator "ChessBase"]
[PlyCount "76"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. g3 {[%emt 0:00:02]} Bg7 {[%emt 0:00:00]} 4. Bg2 {[%emt 0:00:01]} O-O {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:02]} d6 {[%emt 0:00:00]} 6. Nf3 {[%emt 0:00:02]} c5 {[%emt 0:00:00]} 7. dxc5 {[%emt 0:00:06]} dxc5 {[%emt 0:00:01]} 8. O-O {[%emt 0:00:01]} Nc6 {[%emt 0:00:01]} 9. Bf4 {[%emt 0:00:04]} Be6 {[%emt 0:00:10]} 10. Ne5 {[%emt 0:00:17]} Qc8 {[%emt 0:00:35]} 11. Nxc6 {[%emt 0:00:12]} bxc6 {[%emt 0:00:00]} 12. b3 {[%emt 0:00:13]} Bh3 {[%emt 0:00:02]} 13. Rc1 {[%emt 0:00:13]} Rd8 {[%emt 0:00:29]} 14. Qc2 {[%emt 0:00:14]} Nh5 {[%emt 0:01:10]} 15. Be3 {[%emt 0:00:05]} Bd4 {[%emt 0:00:05]} 16. Na4 {[%emt 0:01:12]} Bxe3 {[%emt 0:00:46]} 17. fxe3 {[%emt 0:00:03]} Bxg2 {[%emt 0:00:01]} 18. Kxg2 {[%emt 0:00:01]} Qe6 {[%emt 0:00:08]} 19. Qc3 {[%emt 0:00:50]} Qg4 {[%emt 0:00:08]} 20. Rf3 {[%emt 0:00:28]} Ng7 {[%emt 0:00:03]} 21. Nxc5 {[%emt 0:00:32]} Nf5 {[%emt 0:00:03]} 22. Kh1 {[%emt 0:00:16]} Rd6 {[%emt 0:00:01]} 23. Rcf1 {[%emt 0:00:10]} Qh3 {[%emt 0:01:22]} 24. Kg1 {[%emt 0:02:11]} Nh6 {[%emt 0:00:21]} 25. R3f2 {[%emt 0:01:01]} Ng4 {[%emt 0:00:04]} 26. Rg2 {[%emt 0:00:11]} Qh6 {[%emt 0:00:10]} 27. Nd3 {[%emt 0:01:00]} Rad8 {[%emt 0:01:29]} 28. Rf4 {[%emt 0:00:38]} Nxe3 {[%emt 0:00:18]} 29. Rgf2 {[%emt 0:00:02]} Nd1 {[%emt 0:00:01]} 30. Qa5 {[%emt 0:00:12]} Nxf2 {[%emt 0:00:03]} 31. Nxf2 {[%emt 0:00:01]} Qh5 {[%emt 0:00:35]} 32. Qxa7 {[%emt 0:00:05]} Qxe2 {[%emt 0:00:03]} 33. Re4 {[%emt 0:00:15]} Rd1+ {[%emt 0:00:16]} 34. Kg2 {[%emt 0:00:02]} Qf1+ {[%emt 0:00:00]} 35. Kf3 {[%emt 0:00:01]} R1d7 {[%emt 0:00:07]} 36. Qc5 {[%emt 0:00:06]} e6 {[%emt 0:00:36]} 37. Qxc6 {[%emt 0:00:22]} Rd3+ {[%emt 0:00:05]} 38. Re3 {[%emt 0:00:07]} Rd2 {[%emt 0:00:00]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "2.6"]
[White "Abdusattorov, Nodirbek"]
[Black "Saduakassova, Dinara"]
[Result "1-0"]
[ECO "C51"]
[WhiteElo "2627"]
[BlackElo "2500"]
[Annotator "TA"]
[PlyCount "101"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 16,101,-22,-29,24,0,114,90,165,151,164,171,198,168,276,0,0,-108,-101,-164,-218,-205,-208,-193,-201,-204,-8,-222,-222,-221,-228,-223,-195,-562,-164,-182,-28,-20,-10,-9,-1,-3,-2,-2,66,0,66,66,64,64,49,60,78,10,71,71,71,71,71,30,30,34,37,37,91,91,91,91,91,91,91,0,0,0,0,0,1238,0,0,0,0,8,3500,2015,4672,128,4602,1055]} 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. b4 Bxb4 5. c3 Ba5 6. d4 exd4 7. O-O d6 8. cxd4 Bb6 9. h3 Nge7 {C51: Evans Gambit: Declined and Accepted without 5...Ba5.} (9... h6 $142) 10. Ng5 $11 d5 (10... Rf8 $11 11. Qb3 Bxd4 12. Bxf7+ Rxf7 13. Qxf7+ Kd7 14. Qe6+ Ke8) 11. exd5 $16 Na5 {[#]} (11... Nxd4 $16 12. d6 cxd6) 12. d6 $146 ({Predecessor:} 12. Bb5+ Bd7 13. Qf3 Bxb5 14. Qxf7+ Kd7 15. Qe6+ Ke8 16. Re1 Qd6 17. Qf7+ Kd8 18. Ba3 c5 19. dxc6 Qxd4 20. Ne6+ {1-0 (20) Sa,P-Machado,M Porto 1996}) 12... Nxc4 13. Qa4+ Nc6 {[#]} 14. Re1+ $1 Be6 (14... N4e5 {was worth a try.} 15. Rxe5+ (15. dxe5 O-O $11) 15... Kf8) 15. Qxc4 $2 ({White has to play} 15. Nxe6 $18 fxe6 16. Rxe6+ Kd7 17. Qxc4 (17. dxc7 Qh4 $17)) 15... O-O $36 {[%mdl 2048] Black is more active.} 16. Rxe6 (16. Qd3 $11 g6 17. Nxe6 fxe6 18. Rxe6) 16... fxe6 $17 17. Qxe6+ (17. Nxe6 $17 Na5 18. Qd3 Qxd6 19. Nxf8 Rxf8 20. Be3) 17... Kh8 $19 18. Qe4 {[%csl Gg5][%cal Re4h7]} g6 19. Qh4 {[%csl Gg5][%cal Rh4h7]} h5 20. Bb2 Qf6 $2 (20... Qxd6 $19 {[%cal Rb6d4]} 21. Nc3 Rf4) 21. Nd2 $2 (21. Nc3 $1 $11 {and White has nothing to worry.} Nxd4 22. Re1 cxd6 23. Nd5 Nf3+ {[%mdl 64] Discovered Attack} 24. Nxf3 Qxb2 25. Qg3) 21... Bxd4 ({And not} 21... cxd6 22. Nde4 $15) 22. Nde4 Qe5 ({Avoid the trap} 22... Bxb2 $2 23. Nxf6 Bxf6 24. Rb1 $18) 23. Bxd4 Nxd4 24. Rb1 $2 (24. Rd1 {was the crucial defense.}) 24... Nf5 $2 (24... cxd6 25. f3 d5) 25. Nf3 Nxh4 $2 (25... Qd5 $19 26. Qf4 Rae8) 26. Nxe5 $11 cxd6 27. Nxd6 Rf6 {Black wants to play ...Raf8.} 28. Ndf7+ Kg8 29. Rxb7 Rf8 (29... g5 $11) 30. Nh6+ $14 Kh8 31. Nd7 {[%mdl 64] Double Attack} Rxf2 32. Nxf8 Rxf8 33. Rxa7 {[%mdl 4096] Endgame KRN-KRN} Rb8 34. Ra4 ({White should play} 34. Kh2 $16) 34... Kg7 35. Rxh4 $16 Kxh6 {KR-KR} 36. Rf4 Rb2 37. Rf2 Rb1+ 38. Rf1 Rb4 39. a3 {[%cal Ba2a3,Ba3a4][%mdl 32]} Rb2 (39... Rc4 $14) 40. Ra1 {Hoping for a4.} Rb5 41. a4 Ra5 42. Kf2 Kg5 43. Ke3 (43. Kg3 $16) 43... Kh4 $1 $11 44. Kf3 Rf5+ 45. Ke4 Kg3 $2 {[%mdl 8192]} (45... Rf2 $11) 46. Ra2 $2 (46. Ra3+ $18 Kxg2 47. a5) 46... Ra5 47. Kd4 g5 $1 48. Kc4 {aiming for Kb4.} h4 $2 {[%mdl 8192]} (48... g4 $11) 49. Kb4 $18 Ra8 50. a5 {Threatens to win with a6.} Rb8+ $2 {[%mdl 8192]} (50... g4 $16) 51. Kc5 {Weighted Error Value: White=0.57/Black=0.52} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "2.7"]
[White "Murzin, Volodar"]
[Black "Salimova, Nurgyul"]
[Result "0-1"]
[ECO "B13"]
[WhiteElo "2478"]
[BlackElo "2397"]
[Annotator "ChessBase"]
[PlyCount "62"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 2. d4 {[%emt 0:00:11]} d5 {[%emt 0:00:00]} 3. exd5 {[%emt 0:00:12]} cxd5 {[%emt 0:00:00]} 4. Bd3 {[%emt 0:00:04]} Nf6 {[%emt 0:00:02]} 5. c3 {[%emt 0:00:06]} Bg4 {[%emt 0:00:08]} 6. Ne2 {[%emt 0:00:03]} e6 {[%emt 0:01:13]} 7. O-O {[%emt 0:00:05]} Nc6 {[%emt 0:00:20]} 8. Qe1 {[%emt 0:00:05]} Bd6 {[%emt 0:01:06]} 9. f3 {[%emt 0:00:03]} Bh5 {[%emt 0:00:04]} 10. Qh4 {[%emt 0:00:03]} h6 {[%emt 0:02:40]} 11. Ng3 {[%emt 0:01:49]} Bg6 {[%emt 0:00:51]} 12. Bxg6 {[%emt 0:00:36]} fxg6 {[%emt 0:00:02]} 13. f4 {[%emt 0:01:11]} Qd7 {[%emt 0:00:36]} 14. Nd2 {[%emt 0:00:40]} O-O-O {[%emt 0:00:16]} 15. Nf3 {[%emt 0:00:07]} g5 {[%emt 0:00:45]} 16. fxg5 {[%emt 0:00:05]} hxg5 {[%emt 0:00:02]} 17. Qxg5 {[%emt 0:00:01]} Ne4 {[%emt 0:00:36]} 18. Nxe4 {[%emt 0:00:46]} dxe4 {[%emt 0:00:01]} 19. Ne5 {[%emt 0:00:02]} Nxe5 {[%emt 0:00:03]} 20. dxe5 {[%emt 0:00:03]} Bc5+ {[%emt 0:00:01]} 21. Be3 {[%emt 0:00:04]} Qd2 {[%emt 0:00:33]} 22. Rae1 {[%emt 0:01:46]} Rd3 {[%emt 0:00:53]} 23. Qxg7 {[%emt 0:00:18]} Bxe3+ {[%emt 0:00:04]} 24. Kh1 {[%emt 0:00:01]} Rdd8 {[%emt 0:01:09]} 25. Qg4 {[%emt 0:00:46]} Kb8 {[%emt 0:00:22]} 26. Qxe4 {[%emt 0:00:15]} Bb6 {[%emt 0:00:12]} 27. Rf6 {[%emt 0:00:48]} Rde8 {[%emt 0:00:07]} 28. Rf7 {[%emt 0:00:49]} Rxh2+ {[%emt 0:00:02]} 29. Kxh2 {[%emt 0:00:03]} Qh6+ {[%emt 0:00:01]} 30. Kg3 {[%emt 0:00:08]} Rg8+ {[%emt 0:00:01]} 31. Kf3 {[%emt 0:00:31]} Qh5+ {[%emt 0:00:01]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "2.8"]
[White "Mammadzada, Gunay"]
[Black "Praggnanandhaa R"]
[Result "0-1"]
[ECO "B56"]
[WhiteElo "2443"]
[BlackElo "2608"]
[Annotator "TA"]
[PlyCount "98"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,98,30,26,31,46,41,59,57,36,48,59,37,103,102,103,104,100,102,97,97,138,137,137,0,39,8,50,-10,39,33,23,0,50,-16,0,0,21,0,115,0,60,30,79,0,4,-58,-66,-52,-38,-93,-89,-102,0,0,29,36,83,-10,122,106,120,117,111,93,101,95,103,0,84,-53,54,0,10,0,91,-367,-353,-29979,-29979,-29978,-29979,-29979,-29957,-2399,-2207]} 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. f3 e5 7. Nb3 Be7 8. Be3 Be6 9. Qe2 {9.Nd5 is becoming the main line. B56: Classical Sicilian: Unusual Lines.} a5 10. O-O-O a4 {[#]} 11. Nc5 {[%mdl 64] Pin. White is slightly better.} a3 {[#]} 12. b3 O-O 13. N5a4 {[#]} ({Avoid the trap} 13. Nxb7 $2 Qb8 $19) 13... Bd7 $146 (13... Nb4 $14) ({Predecessor:} 13... Nb4 14. Bc5 d5 15. exd5 Bxc5 16. dxe6 Bd4 17. exf7+ Rxf7 18. Qc4 Nxa2+ 19. Nxa2 Bb2+ 20. Nxb2 axb2+ 21. Kxb2 Qxd1 22. Qxf7+ Kxf7 {½-½ (37) Vuckovic,M (2034)-Pobor,D (1931) Pljevlja 2018}) 14. Qd2 $16 Nd4 15. Bxd4 exd4 16. Qxd4 Bxa4 17. Nxa4 Qa5 18. Nb6 $1 Rad8 19. Nc4 (19. b4 $16 Qg5+ 20. Kb1) 19... Qc7 $14 {White should prevent ...d5.} 20. Qb6 Qc8 {And now ...d5 would win.} (20... Qb8 $5 {[%cal Rd6d5]} 21. Nxa3 d5 $11) 21. Qb4 (21. Nxa3 $14 d5 22. Nb5) 21... Qc7 22. Qa5 ({Don't go for} 22. Qxa3 $2 d5 $19) 22... Qc6 23. Qb6 Qc8 $1 24. Qb4 (24. Nxa3 $14 d5 25. Nb5) 24... Qe6 {...d5 is the strong threat.} 25. Qb6 $1 ({Much worse is} 25. Qxb7 d5 $17) 25... Nd7 26. Qe3 Nc5 (26... Nf6 $1 $11) 27. Nxa3 (27. Nb6 $16) 27... d5 (27... Ra8 $1 $11 28. Bc4 Qe5) 28. Kb1 Nxe4 {White must now prevent ...Bc5.} 29. fxe4 (29. Nb5 $16 Bc5 30. Rd4 $1) 29... Bxa3 $11 30. Bb5 (30. Qd4 $11) 30... dxe4 $15 {Threatens to win with ...Qe5.} 31. c3 Qe5 32. Bc4 (32. Be2 $15) 32... b5 $17 33. Be2 Bc5 ({Black should try} 33... b4 $17 34. Qg3 Qe6 35. Rxd8 Rxd8) 34. Qg3 $11 Qe7 35. Bxb5 e3 {[#]} 36. Qf3 ({White should play} 36. Rhe1 $1 $16) 36... Rxd1+ (36... Qe5 $1 $11) 37. Rxd1 $16 Qe5 38. Kc2 Be7 39. Rd5 Qe6 40. Bd3 Bf6 41. c4 (41. Qf5 $16 {[%csl Gd3][%cal Rf5h7]} g6 42. Qxe6 fxe6 43. Rd6) 41... Re8 {[#]} (41... Qb6 $11 {keeps the balance.}) 42. Be2 (42. c5 $1 $16) 42... h6 ({Better is} 42... Qe7 $15 43. Qf1 Qb4) 43. Qf5 (43. b4 $14) 43... Qb6 44. Qd7 Rf8 (44... Ra8 $11 45. a3 Qb8) 45. c5 $2 {[%mdl 8192] Now White is beyond hope.} (45. a3 $16 {keeps the pressure on.}) 45... Qa5 46. Qa4 (46. Kd1 $19 Qc3 47. Bb5 Qa1+ 48. Ke2 Qxa2+ 49. Kxe3 Qxg2 50. c6 Bg5+ 51. Kd4 Qg1+ 52. Kd3 Qd1+ 53. Kc4 Qc1+ 54. Kb4 Qe1+ 55. Kc4 Qe4+ 56. Rd4 Qe2+ {[%mdl 64] Double Attack} 57. Kb4 Qe1+ 58. Kc4 Qc1+ 59. Kb4) 46... Qc3+ 47. Kd1 Qa1+ 48. Kc2 Qb2+ 49. Kd3 Qd2+ {Weighted Error Value: White=0.55/Black=0.33} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "2.9"]
[White "Nihal Sarin"]
[Black "Yip, Carissa"]
[Result "1-0"]
[ECO "B06"]
[WhiteElo "2620"]
[BlackElo "2430"]
[Annotator "TA"]
[PlyCount "77"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,77,50,43,34,45,31,31,30,38,16,28,16,57,42,90,45,83,66,90,90,94,96,108,104,100,58,129,81,159,168,177,185,235,240,252,239,314,204,259,284,286,260,298,298,285,291,848,858,1245,734,715,712,873,866,977,975,1058,956,967,918,2350,1998,29981,29982,29987,29988,29988,29989,29989,29990]} 1. Nf3 g6 2. e4 Bg7 3. d4 d6 4. Bc4 e6 5. O-O Ne7 6. Nbd2 {B06: Modern Defence.} a6 7. c3 Nd7 8. Re1 {White is slightly better.} O-O 9. Bd3 $5 {[%mdl 4] Exploring less charted territory.} e5 10. Nf1 {[#]} c6 $146 ({Predecessor:} 10... b5 11. a4 b4 12. Be3 exd4 13. cxd4 c5 14. Bf4 Qb6 15. Ne3 cxd4 16. Nc4 Qa7 17. Bxd6 Nc5 {1-0 (40) Van den Doel,E (2610)-Vedrickas,T (2390) Prague 2019}) 11. Ng3 h6 12. h3 Qc7 13. a4 Rd8 14. Qe2 b6 15. Be3 Bb7 16. dxe5 dxe5 17. b4 b5 (17... c5 $14) 18. c4 {[%cal Ra4b5]} bxc4 ({Black should try} 18... bxa4 19. c5 (19. Rxa4 c5 $11) 19... a5) 19. Bxc4 $16 a5 20. bxa5 Qxa5 21. Qa2 Rf8 22. Red1 Rad8 23. Bd2 Qa8 24. a5 Ba6 25. Be3 c5 26. Rd6 Bxc4 27. Qxc4 Nc6 $2 (27... Rfe8 28. a6 Nf8) 28. Rxg6 $18 Nxa5 {[#]} 29. Rxg7+ $1 {[%mdl 512]} Kxg7 30. Qc3 Rfe8 31. Rxa5 {[%mdl 64] Double Attack} Qc6 32. Nf5+ Kh7 33. Nxh6 Rf8 34. Nxe5 Qf6 35. Nhg4 Qh8 36. Ra6 {White mates.} Kg8 37. Nh6+ Kh7 38. Nhxf7 {[%mdl 64] [#] Double Attack} Nxe5 39. Rh6+ {Weighted Error Value: White=0.17/Black=0.52} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "2.10"]
[White "Badelka, Olga"]
[Black "Lei, Tingjie"]
[Result "0-1"]
[ECO "D02"]
[WhiteElo "2433"]
[BlackElo "2505"]
[Annotator "ChessBase"]
[PlyCount "76"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 3. Bf4 {[%emt 0:00:01]} e6 {[%emt 0:00:21]} 4. e3 {[%emt 0:00:07]} Bd6 {[%emt 0:00:01]} 5. Bg3 {[%emt 0:00:05]} c5 {[%emt 0:00:13]} 6. Nbd2 {[%emt 0:00:13]} Qb6 {[%emt 0:01:17]} 7. Bxd6 {[%emt 0:01:17]} Qxd6 {[%emt 0:00:03]} 8. dxc5 {[%emt 0:00:02]} Qxc5 {[%emt 0:00:02]} 9. c4 {[%emt 0:00:03]} Nc6 {[%emt 0:00:42]} 10. Rc1 {[%emt 0:00:07]} d4 {[%emt 0:01:14]} 11. exd4 {[%emt 0:00:29]} Nxd4 {[%emt 0:00:03]} 12. a3 {[%emt 0:00:41]} O-O {[%emt 0:01:14]} 13. b4 {[%emt 0:00:08]} Nxf3+ {[%emt 0:00:03]} 14. Nxf3 {[%emt 0:00:21]} Qe7 {[%emt 0:00:05]} 15. c5 {[%emt 0:01:42]} e5 {[%emt 0:03:09]} 16. Bc4 {[%emt 0:00:03]} e4 {[%emt 0:00:06]} 17. Ng5 {[%emt 0:01:22]} h6 {[%emt 0:00:31]} 18. Nxf7 {[%emt 0:00:26]} Rxf7 {[%emt 0:00:06]} 19. Bxf7+ {[%emt 0:00:06]} Qxf7 {[%emt 0:00:05]} 20. Qd8+ {[%emt 0:00:20]} Kh7 {[%emt 0:00:03]} 21. O-O {[%emt 0:00:25]} Qg6 {[%emt 0:00:08]} 22. Qd6 {[%emt 0:01:12]} Bd7 {[%emt 0:00:07]} 23. Rc3 {[%emt 0:00:10]} Bb5 {[%emt 0:00:21]} 24. Rg3 {[%emt 0:00:17]} Qf7 {[%emt 0:00:02]} 25. Rd1 {[%emt 0:00:35]} Nh5 {[%emt 0:00:19]} 26. Re3 {[%emt 0:00:20]} Rf8 {[%emt 0:00:58]} 27. Qd2 {[%emt 0:00:03]} Nf4 {[%emt 0:00:15]} 28. f3 {[%emt 0:00:55]} exf3 {[%emt 0:00:16]} 29. Rxf3 {[%emt 0:00:01]} Bc6 {[%emt 0:00:01]} 30. Rg3 {[%emt 0:00:04]} Be4 {[%emt 0:00:32]} 31. Re1 {[%emt 0:00:09]} Qf5 {[%emt 0:00:09]} 32. Qe3 {[%emt 0:00:28]} Bc6 {[%emt 0:00:05]} 33. Qd2 {[%emt 0:00:16]} Rf6 {[%emt 0:00:02]} 34. h3 {[%emt 0:00:06]} Nxg2 {[%emt 0:00:07]} 35. Rxg2 {[%emt 0:00:07]} Bxg2 {[%emt 0:00:01]} 36. Kxg2 {[%emt 0:00:02]} Rg6+ {[%emt 0:00:04]} 37. Kh2 {[%emt 0:00:02]} Qf3 {[%emt 0:00:05]} 38. Re3 {[%emt 0:00:20]} Qf4+ {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "3.1"]
[White "Lei, Tingjie"]
[Black "Zhu, Jiner"]
[Result "1-0"]
[ECO "A18"]
[WhiteElo "2505"]
[BlackElo "2459"]
[Annotator "ChessBase"]
[PlyCount "43"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. c4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nc3 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. e4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 4. cxd5 {[%emt 0:00:00]} exd5 {[%emt 0:00:00]} 5. e5 {[%emt 0:00:00]} d4 {[%emt 0:00:34]} 6. exf6 {[%emt 0:00:01]} dxc3 {[%emt 0:00:03]} 7. Bb5+ {[%emt 0:00:01]} c6 {[%emt 0:00:01]} 8. Qe2+ {[%emt 0:00:03]} Be6 {[%emt 0:00:03]} 9. Bc4 {[%emt 0:00:01]} cxd2+ {[%emt 0:00:05]} 10. Bxd2 {[%emt 0:00:02]} Qxf6 {[%emt 0:00:05]} 11. Nf3 {[%emt 0:00:05]} Be7 {[%emt 0:01:08]} 12. O-O-O {[%emt 0:00:05]} h6 {[%emt 0:01:02]} 13. Rhe1 {[%emt 0:00:03]} O-O {[%emt 0:00:36]} 14. Bxe6 {[%emt 0:00:05]} Qxe6 {[%emt 0:00:12]} 15. Qd3 {[%emt 0:03:25]} Qd6 {[%emt 0:02:36]} 16. Qe4 {[%emt 0:00:05]} Qc5+ {[%emt 0:00:10]} 17. Kb1 {[%emt 0:00:09]} Bd6 {[%emt 0:00:44]} 18. Be3 {[%emt 0:00:34]} Qb4 {[%emt 0:02:10]} 19. Rd4 {[%emt 0:00:03]} Qc5 {[%emt 0:00:12]} 20. Rc1 {[%emt 0:01:38]} Qa5 {[%emt 0:00:11]} 21. Rxd6 {[%emt 0:00:04]} Na6 {[%emt 0:00:31]} 22. Bxh6 {[%emt 0:02:14]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "3.2"]
[White "Yip, Carissa"]
[Black "Badelka, Olga"]
[Result "1-0"]
[ECO "B01"]
[WhiteElo "2430"]
[BlackElo "2433"]
[Annotator "NA"]
[PlyCount "95"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. exd5 {[%emt 0:00:00]} Qxd5 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:06]} Qd6 {[%emt 0:00:00]} 4. d4 {[%emt 0:00:06]} Nf6 {[%emt 0:00:00]} 5. Nb5 {[%emt 0:00:27]} Qd8 {[%emt 0:00:37]} 6. c4 {[%emt 0:00:09]} c6 {[%emt 0:01:28]} 7. Nc3 {[%emt 0:00:02]} Bg4 {[%emt 0:02:30]} 8. Qb3 {[%emt 0:00:31]} Qb6 {[%emt 0:00:21]} 9. h3 {[%emt 0:00:14]} Bh5 {[%emt 0:00:11]} 10. c5 {[%emt 0:00:30]} Qxb3 {[%emt 0:00:16]} 11. axb3 {[%emt 0:00:01]} Nbd7 {[%emt 0:00:18]} 12. b4 {[%emt 0:00:03]} e5 {[%emt 0:00:13]} 13. dxe5 {[%emt 0:00:05]} Nxe5 {[%emt 0:00:02]} 14. f4 {[%emt 0:00:07]} Ned7 {[%emt 0:00:33]} 15. g4 {[%emt 0:00:01]} Nxg4 {[%emt 0:00:02]} 16. hxg4 {[%emt 0:00:01]} Bxg4 {[%emt 0:00:01]} 17. Bh3 {[%emt 0:00:20]} f5 {[%emt 0:00:15]} 18. Kf2 {[%emt 0:00:51]} Nf6 {[%emt 0:00:14]} 19. Bg2 {[%emt 0:00:18]} a6 {[%emt 0:00:26]} 20. Nf3 {[%emt 0:00:12]} O-O-O {[%emt 0:00:16]} 21. Be3 {[%emt 0:00:27]} Bxf3 {[%emt 0:00:28]} 22. Bxf3 {[%emt 0:00:03]} Be7 {[%emt 0:00:18]} 23. Rhd1 {[%emt 0:00:07]} h5 {[%emt 0:00:32]} 24. Rxd8+ {[%emt 0:00:39]} Bxd8 {[%emt 0:00:08]} 25. Rh1 {[%emt 0:00:23]} h4 {[%emt 0:00:17]} 26. Bd4 {[%emt 0:00:45]} Rh7 {[%emt 0:00:52]} 27. Be5 {[%emt 0:00:35]} Nd7 {[%emt 0:00:48]} 28. Bd6 {[%emt 0:00:30]} Bf6 {[%emt 0:00:16]} 29. Be2 {[%emt 0:00:20]} Bd4+ {[%emt 0:00:16]} 30. Kf3 {[%emt 0:00:25]} Nf6 {[%emt 0:00:07]} 31. Bc4 {[%emt 0:00:04]} Kd7 {[%emt 0:00:23]} 32. Re1 {[%emt 0:00:03]} h3 {[%emt 0:00:09]} 33. Be6+ {[%emt 0:00:04]} Kd8 {[%emt 0:00:03]} 34. Bxf5 {[%emt 0:00:39]} Rh5 {[%emt 0:00:02]} 35. Be7+ {[%emt 0:00:56]} Kc7 {[%emt 0:00:05]} 36. Bxf6 {[%emt 0:00:19]} Bxf6 {[%emt 0:00:01]} 37. Bg4 {[%emt 0:00:03]} Rh8 {[%emt 0:00:05]} 38. Rh1 {[%emt 0:00:17]} h2 {[%emt 0:00:03]} 39. Kg2 {[%emt 0:00:08]} Rh4 {[%emt 0:00:13]} 40. Kg3 {[%emt 0:00:11]} b6 {[%emt 0:00:19]} 41. Ne4 {[%emt 0:00:29]} Be7 {[%emt 0:00:04]} 42. Rxh2 {[%emt 0:00:03]} Rxh2 {[%emt 0:00:02]} 43. Kxh2 {[%emt 0:00:00]} a5 {[%emt 0:00:02]} 44. cxb6+ {[%emt 0:00:19]} Kxb6 {[%emt 0:00:02]} 45. bxa5+ {[%emt 0:00:01]} Kxa5 {[%emt 0:00:01]} 46. Be6 {[%emt 0:00:04]} Kb4 {[%emt 0:00:05]} 47. Kg3 {[%emt 0:00:03]} c5 {[%emt 0:00:11]} 48. b3 {[%emt 0:00:02]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "3.3"]
[White "Praggnanandhaa R"]
[Black "Nihal Sarin"]
[Result "1-0"]
[ECO "D37"]
[WhiteElo "2608"]
[BlackElo "2620"]
[Annotator "TA"]
[PlyCount "121"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,121,26,25,25,45,43,37,40,37,41,41,35,43,27,27,27,20,15,23,26,34,33,29,29,31,28,15,16,19,8,24,22,34,42,76,87,74,64,124,121,121,118,119,120,118,117,133,133,133,119,113,127,104,107,113,113,113,109,364,272,133,65,651,692,683,672,515,394,2182,1945,5923,12817,29955,29959,29955,6422,29969,29969,29969,29971,29971,29970,29970,29970,29969,29967,29965,29960,29976,29969,29970,29971,29971,29973,29981,29982,29982,29983,29985,29986,29986,29984,29982,29983,29983,29984,29985,29985,29985,29986,29986,29985,29987,29988]} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Nbd7 5. Bf4 dxc4 6. e3 {D37: Queen's Gambit Declined: 5 Bf4.} b5 7. Nxb5 Bb4+ 8. Nc3 {White is slightly better.} Nd5 9. a3 ({Reject} 9. Bxc4 Nxc3 10. bxc3 Bxc3+ 11. Ke2 Bxa1 $15) 9... Nxc3 10. Qd2 {[%mdl 64] Pin} Bxa3 {[#] ...Ne4 is the strong threat.} 11. bxc3 $1 $146 {[%mdl 8] An important novelty.} ({Inferior is} 11. Rxa3 Nb1 $17) ({Predecessor:} 11. Qxc3 Bd6 12. Bxd6 cxd6 13. Bxc4 O-O 14. d5 e5 15. O-O a5 16. Nd2 Bb7 17. b3 {1-0 (37) Giri,A (2764)-Kramnik,V (2753) chess24.com INT 2020}) 11... Bd6 12. Bxd6 cxd6 13. Bxc4 O-O 14. O-O Bb7 15. Be2 Qc7 16. c4 a5 17. Rfc1 h6 18. Qc3 Rfc8 19. Nd2 e5 20. Bg4 exd4 21. exd4 Re8 22. Bxd7 Qxd7 23. Rxa5 Bxg2 24. Kxg2 $16 {aiming for Rxa8.} Rxa5 25. Qxa5 {Strongly threatening Qh5.} Qg4+ 26. Kh1 Qxd4 27. Qd5 Qxf2 28. Rf1 ({Weaker is} 28. Qxd6 Re2 $15) 28... Re1 29. Qa8+ Kh7 {[#]} 30. Qe4+ $1 {[%mdl 512]} Rxe4 31. Rxf2 {[%mdl 4096] Endgame KRN-KR} Rd4 32. Kg2 f5 33. Kf3 {And now Ke3 would win.} f4 {[%mdl 8192]} (33... Rh4 $16 34. Ke2 Kg6) 34. Ke2 $18 g5 35. Kd1 ({White should play} 35. h3 $16) 35... Kg6 $2 {[%mdl 8192] [#]} (35... Rd3 $14) 36. Kc2 $1 f3 37. Rxf3 Rh4 38. h3 g4 $2 (38... h5 39. Kd3 g4 40. hxg4 Rxg4) 39. hxg4 Rxg4 40. Rd3 h5 41. Rxd6+ Kf7 42. Kd3 h4 43. Nf3 {White mates.} Rg3 44. Ke3 h3 45. Rh6 Kg7 46. Rh4 Kf6 47. Kf4 Rg8 48. Rxh3 Ke6 49. Ke4 Kd6 50. Kd3 Kc5 51. Rh5+ Kb4 52. Rb5+ Ka4 53. Rb1 Rd8+ 54. Nd4 Rc8 55. Kc3 {[%cal Rb1a1]} Ka5 56. Rb5+ Ka6 57. c5 Rh8 58. Kc4 Rh6 59. Rb1 Rg6 60. Re1 Rh6 61. Re6+ {Weighted Error Value: White=0.06/Black=0.66} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "3.4"]
[White "Salimova, Nurgyul"]
[Black "Mammadzada, Gunay"]
[Result "0-1"]
[ECO "D15"]
[WhiteElo "2397"]
[BlackElo "2443"]
[Annotator "NA"]
[PlyCount "66"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:01]} d5 {[%emt 0:00:00]} 3. c4 {[%emt 0:00:09]} c6 {[%emt 0:00:02]} 4. Nc3 {[%emt 0:00:03]} a6 {[%emt 0:00:02]} 5. Qc2 {[%emt 0:00:20]} g6 {[%emt 0:00:08]} 6. e4 {[%emt 0:00:27]} dxe4 {[%emt 0:00:03]} 7. Nxe4 {[%emt 0:00:02]} Nxe4 {[%emt 0:00:18]} 8. Qxe4 {[%emt 0:00:02]} Bg7 {[%emt 0:00:00]} 9. Be2 {[%emt 0:00:47]} O-O {[%emt 0:00:34]} 10. O-O {[%emt 0:00:13]} Bf5 {[%emt 0:01:07]} 11. Qh4 {[%emt 0:00:28]} Nd7 {[%emt 0:00:38]} 12. Bg5 {[%emt 0:00:19]} Re8 {[%emt 0:00:47]} 13. Rad1 {[%emt 0:00:36]} Qc7 {[%emt 0:01:45]} 14. Rfe1 {[%emt 0:01:19]} e5 {[%emt 0:01:24]} 15. dxe5 {[%emt 0:00:32]} Nxe5 {[%emt 0:00:02]} 16. Nd4 {[%emt 0:00:09]} Bd7 {[%emt 0:00:14]} 17. Bf6 {[%emt 0:04:51]} c5 {[%emt 0:00:08]} 18. Bxg7 {[%emt 0:00:11]} Kxg7 {[%emt 0:00:05]} 19. Nc2 {[%emt 0:00:19]} Bc6 {[%emt 0:02:32]} 20. Ne3 {[%emt 0:00:05]} Rad8 {[%emt 0:00:15]} 21. Qg3 {[%emt 0:00:16]} f6 {[%emt 0:00:50]} 22. h4 {[%emt 0:00:05]} Kh8 {[%emt 0:00:23]} 23. h5 {[%emt 0:00:15]} Qg7 {[%emt 0:00:14]} 24. hxg6 {[%emt 0:00:09]} Qxg6 {[%emt 0:00:07]} 25. Qh3 {[%emt 0:00:15]} Rg8 {[%emt 0:00:07]} 26. Rxd8 {[%emt 0:00:03]} Rxd8 {[%emt 0:00:04]} 27. Bf1 {[%emt 0:00:07]} Nf3+ {[%emt 0:00:03]} 28. Kh1 {[%emt 0:00:01]} Nxe1 {[%emt 0:00:01]} 29. Qe6 {[%emt 0:00:06]} Re8 {[%emt 0:00:07]} 30. Qd6 {[%emt 0:00:03]} Kg7 {[%emt 0:00:04]} 31. Qc7+ {[%emt 0:00:03]} Kg8 {[%emt 0:00:03]} 32. Qh2 {[%emt 0:00:16]} Re5 {[%emt 0:00:11]} 33. Be2 {[%emt 0:00:09]} Nxg2 {[%emt 0:00:12]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "3.5"]
[White "Saduakassova, Dinara"]
[Black "Murzin, Volodar"]
[Result "1/2-1/2"]
[ECO "E68"]
[WhiteElo "2500"]
[BlackElo "2478"]
[Annotator "ChessBase"]
[PlyCount "172"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. g3 {[%emt 0:00:00]} Bg7 {[%emt 0:00:01]} 4. Bg2 {[%emt 0:00:00]} O-O {[%emt 0:00:01]} 5. Nc3 {[%emt 0:00:01]} d6 {[%emt 0:00:01]} 6. Nf3 {[%emt 0:00:01]} Nbd7 {[%emt 0:00:02]} 7. O-O {[%emt 0:00:01]} e5 {[%emt 0:00:01]} 8. e4 {[%emt 0:00:02]} a6 {[%emt 0:00:07]} 9. h3 {[%emt 0:00:23]} b5 {[%emt 0:00:03]} 10. dxe5 {[%emt 0:00:02]} dxe5 {[%emt 0:00:05]} 11. Be3 {[%emt 0:00:20]} b4 {[%emt 0:01:10]} 12. Nd5 {[%emt 0:00:50]} Rb8 {[%emt 0:00:38]} 13. Nxf6+ {[%emt 0:00:46]} Qxf6 {[%emt 0:00:05]} 14. Qd2 {[%emt 0:00:17]} Qe7 {[%emt 0:00:45]} 15. Rfd1 {[%emt 0:00:32]} Nc5 {[%emt 0:00:08]} 16. Qd5 {[%emt 0:02:12]} Na4 {[%emt 0:00:08]} 17. Rab1 {[%emt 0:02:20]} Nb6 {[%emt 0:05:18]} 18. Qc5 {[%emt 0:00:22]} Qxc5 {[%emt 0:00:15]} 19. Bxc5 {[%emt 0:00:02]} Re8 {[%emt 0:00:01]} 20. b3 {[%emt 0:00:55]} Bf8 {[%emt 0:00:05]} 21. Bxf8 {[%emt 0:00:32]} Kxf8 {[%emt 0:00:00]} 22. Ne1 {[%emt 0:00:01]} a5 {[%emt 0:00:32]} 23. Nd3 {[%emt 0:00:02]} Nd7 {[%emt 0:00:02]} 24. h4 {[%emt 0:00:05]} Ke7 {[%emt 0:00:07]} 25. Bh3 {[%emt 0:00:05]} f6 {[%emt 0:00:01]} 26. Bxd7 {[%emt 0:00:08]} Bxd7 {[%emt 0:00:04]} 27. Nc5 {[%emt 0:00:01]} Bc6 {[%emt 0:00:01]} 28. f3 {[%emt 0:00:03]} Red8 {[%emt 0:00:13]} 29. Kf2 {[%emt 0:00:02]} Rd6 {[%emt 0:00:15]} 30. Ke3 {[%emt 0:00:06]} Rbd8 {[%emt 0:00:08]} 31. Rd3 {[%emt 0:00:02]} f5 {[%emt 0:00:33]} 32. Rbd1 {[%emt 0:00:17]} h5 {[%emt 0:00:59]} 33. R1d2 {[%emt 0:00:25]} Rf8 {[%emt 0:00:11]} 34. Rd1 {[%emt 0:01:10]} Ra8 {[%emt 0:00:25]} 35. R1d2 {[%emt 0:00:14]} a4 {[%emt 0:00:11]} 36. Rxd6 {[%emt 0:00:12]} cxd6 {[%emt 0:00:01]} 37. Nd3 {[%emt 0:00:00]} Rb8 {[%emt 0:00:10]} 38. bxa4 {[%emt 0:00:05]} Bxa4 {[%emt 0:00:01]} 39. Rb2 {[%emt 0:00:02]} b3 {[%emt 0:00:05]} 40. axb3 {[%emt 0:00:01]} Rxb3 {[%emt 0:00:05]} 41. Rxb3 {[%emt 0:00:01]} Bxb3 {[%emt 0:00:01]} 42. exf5 {[%emt 0:00:07]} gxf5 {[%emt 0:00:19]} 43. c5 {[%emt 0:00:03]} Bc4 {[%emt 0:00:02]} 44. cxd6+ {[%emt 0:00:02]} Kxd6 {[%emt 0:00:00]} 45. Nf2 {[%emt 0:00:01]} Ke6 {[%emt 0:00:01]} 46. Nd1 {[%emt 0:00:02]} Bb3 {[%emt 0:00:06]} 47. Nc3 {[%emt 0:00:02]} Bc4 {[%emt 0:00:01]} 48. f4 {[%emt 0:00:01]} Kf6 {[%emt 0:00:03]} 49. Na4 {[%emt 0:00:03]} Ke6 {[%emt 0:00:12]} 50. Nc5+ {[%emt 0:00:08]} Kd6 {[%emt 0:00:01]} 51. Nb7+ {[%emt 0:00:04]} Ke6 {[%emt 0:00:19]} 52. Nc5+ {[%emt 0:00:07]} Kd6 {[%emt 0:00:02]} 53. Na4 {[%emt 0:00:01]} Ke6 {[%emt 0:00:02]} 54. Nb2 {[%emt 0:00:02]} Bb5 {[%emt 0:00:02]} 55. Nd1 {[%emt 0:00:01]} Kd5 {[%emt 0:00:03]} 56. Nf2 {[%emt 0:00:03]} Ke6 {[%emt 0:00:09]} 57. Nh3 {[%emt 0:00:02]} Kd5 {[%emt 0:00:07]} 58. Ng5 {[%emt 0:00:02]} Bd7 {[%emt 0:00:12]} 59. fxe5 {[%emt 0:00:06]} Kxe5 {[%emt 0:00:01]} 60. Nf3+ {[%emt 0:00:01]} Kf6 {[%emt 0:00:01]} 61. Kf4 {[%emt 0:00:09]} Bc8 {[%emt 0:00:01]} 62. Nd4 {[%emt 0:00:02]} Bd7 {[%emt 0:00:01]} 63. Nc2 {[%emt 0:00:01]} Bc8 {[%emt 0:00:02]} 64. Ne3 {[%emt 0:00:01]} Be6 {[%emt 0:00:01]} 65. Nf1 {[%emt 0:00:06]} Bd7 {[%emt 0:00:07]} 66. Nd2 {[%emt 0:00:02]} Bc8 {[%emt 0:00:02]} 67. Nc4 {[%emt 0:00:05]} Bd7 {[%emt 0:00:06]} 68. Ke3 {[%emt 0:00:10]} Be6 {[%emt 0:00:03]} 69. Nd2 {[%emt 0:00:02]} Bd5 {[%emt 0:00:11]} 70. Kf4 {[%emt 0:00:03]} Be6 {[%emt 0:00:03]} 71. Nf3 {[%emt 0:00:02]} Bc8 {[%emt 0:00:04]} 72. Nd4 {[%emt 0:00:01]} Bd7 {[%emt 0:00:02]} 73. Ke3 {[%emt 0:00:01]} Ke5 {[%emt 0:00:02]} 74. Ne2 {[%emt 0:00:01]} Be8 {[%emt 0:00:08]} 75. Nf4 {[%emt 0:00:03]} Bf7 {[%emt 0:00:02]} 76. Kd3 {[%emt 0:00:03]} Be8 {[%emt 0:00:03]} 77. Ke3 {[%emt 0:00:02]} Bf7 {[%emt 0:00:02]} 78. Nd3+ {[%emt 0:00:01]} Kf6 {[%emt 0:00:00]} 79. Kd4 {[%emt 0:00:00]} Be6 {[%emt 0:00:20]} 80. Nf4 {[%emt 0:00:05]} Bf7 {[%emt 0:00:02]} 81. Nh3 {[%emt 0:00:44]} Be6 {[%emt 0:00:09]} 82. Ng5 {[%emt 0:00:06]} Bg8 {[%emt 0:00:09]} 83. Ke3 {[%emt 0:00:01]} Bd5 {[%emt 0:00:03]} 84. Kf4 {[%emt 0:00:01]} Bc6 {[%emt 0:00:05]} 85. Nh7+ {[%emt 0:00:03]} Kg6 {[%emt 0:00:01]} 86. Ng5 {[%emt 0:00:18]} Kf6 {[%emt 0:00:02]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "3.6"]
[White "Liang, Awonder"]
[Black "Abdusattorov, Nodirbek"]
[Result "1/2-1/2"]
[ECO "A17"]
[WhiteElo "2592"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "120"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 17,120,41,38,22,31,0,3,0,12,-10,29,28,29,29,35,4,16,0,30,0,3,-14,-11,-19,-18,-58,-41,-52,-24,-22,0,-35,-32,-59,-4,-18,0,0,12,15,12,1,1,0,2,8,16,14,30,-36,-31,-37,-29,-54,-27,-58,-27,-31,-10,-71,-81,-106,-48,-46,-7,-14,-7,0,0,0,25,13,12,0,0,0,0,0,19,0,0,0,0,0,0,0,0,0,8,8,8,8,8,0,0,-8,-8,-8,-8,-8,8,8,8,-8,-8]} 1. Nf3 {Hjartarson,J} Nf6 2. g3 b6 3. Bg2 Bb7 4. O-O e6 5. c4 Be7 6. Nc3 O-O 7. Re1 Ne4 8. Nxe4 Bxe4 9. d3 Bb7 10. d4 {A17: English Opening: 1...Nf6 with ...Bb4.} Be4 11. Bf4 {[#]} d6 $146 ({Predecessor:} 11... Bf6 12. Qd2 d6 13. Rad1 Nd7 14. Qe3 d5 15. b4 c6 16. Rc1 b5 17. cxb5 cxb5 {½-½ (27) Hjartarson,J (2570)-Stefansson,H (2520) Reykjavik 1995 CBM 051 [Hjartarson,J]}) 12. h4 Nd7 13. Qd2 Bf6 14. Rad1 Qe7 15. Qe3 Bb7 16. Qa3 Be4 17. Qe3 Bb7 18. Qa3 Be4 19. d5 e5 20. Bc1 a5 21. Qe3 Bc2 22. Rd2 Bb1 23. b3 Nc5 24. Ba3 Bf5 25. Ng5 Bxg5 (25... e4 $15) 26. Qxg5 $11 Qxg5 27. hxg5 Ne4 28. Bxe4 Bxe4 29. Bb2 a4 30. b4 f6 31. f3 Bg6 32. gxf6 gxf6 33. g4 (33. a3 $11) 33... f5 $15 34. gxf5 Rxf5 35. c5 a3 36. Bc3 bxc5 37. bxc5 e4 38. fxe4 (38. cxd6 $11 cxd6 39. Bb4) 38... Rg5+ $17 {[%mdl 64] [#] Discovered Attack} 39. Kf2 Rf8+ ({Don't play} 39... Bxe4 40. cxd6 cxd6 41. Bb4 $11) ({Black should try} 39... dxc5 $17 {( -> ...Rf8+)} 40. Rdd1 Rf8+ 41. Ke3 Rg4) 40. Ke3 $15 Rg3+ (40... dxc5 {keeps more tension.} 41. Kd3 Rxd5+ 42. Kc4 Rxd2 43. Bxd2 Re8) 41. Kd4 Rf4 {[%csl Gg6][%cal Rf4e4]} 42. Kc4 Rxe4+ 43. Rd4 h5 (43... dxc5 {is more complex.} 44. Rxe4 Bxe4 45. Ba5 Rg7 46. Kxc5 h5) 44. Rxe4 Bxe4 $11 {[%mdl 4096] Endgame KRB-KRB. The position is equal.} 45. Ba5 (45. cxd6 {is interesting.} cxd6 46. Bb4 Rg6 47. Rf1 Rg5 48. Rd1) 45... Rg7 46. cxd6 cxd6 47. Bb4 Rg6 48. Kd4 Bg2 $1 49. Rg1 Rg4+ 50. Kc3 Bxd5 51. Rxg4+ hxg4 52. Bxa3 {KB-KB} g3 {[#] Strongly threatening ...g2.} 53. Bxd6 g2 54. Bh2 Bxa2 55. Kd2 Kf7 56. Ke1 Ke6 57. Kf2 Bd5 58. e4 g1=Q+ 59. Kxg1 Bxe4 60. Be5 Kxe5 {Weighted Error Value: White=0.15/Black=0.10} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "3.7"]
[White "Yoo, Christopher Woojin"]
[Black "Khademalsharieh, Sarasadat"]
[Result "1-0"]
[ECO "C44"]
[WhiteElo "2455"]
[BlackElo "2494"]
[Annotator "ChessBase"]
[PlyCount "59"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:05]} exd4 {[%emt 0:00:00]} 4. c3 {[%emt 0:00:02]} d5 {[%emt 0:00:05]} 5. Bd3 {[%emt 0:00:02]} dxc3 {[%emt 0:00:31]} 6. exd5 {[%emt 0:00:03]} Qxd5 {[%emt 0:00:15]} 7. Nxc3 {[%emt 0:02:26]} Bb4 {[%emt 0:00:10]} 8. O-O {[%emt 0:00:50]} Bxc3 {[%emt 0:00:14]} 9. bxc3 {[%emt 0:00:00]} Bg4 {[%emt 0:00:54]} 10. c4 {[%emt 0:01:05]} Qd6 {[%emt 0:02:24]} 11. Qb3 {[%emt 0:03:20]} Bxf3 {[%emt 0:00:42]} 12. gxf3 {[%emt 0:00:12]} Nge7 {[%emt 0:02:56]} 13. Ba3 {[%emt 0:00:49]} Qf6 {[%emt 0:00:44]} 14. Qxb7 {[%emt 0:01:02]} O-O {[%emt 0:00:20]} 15. Qxc7 {[%emt 0:00:25]} Rfd8 {[%emt 0:00:30]} 16. Be4 {[%emt 0:00:39]} Rac8 {[%emt 0:00:06]} 17. Qg3 {[%emt 0:00:06]} Nd4 {[%emt 0:00:03]} 18. Kh1 {[%emt 0:00:06]} Nef5 {[%emt 0:00:05]} 19. Qh3 {[%emt 0:00:06]} Rxc4 {[%emt 0:00:04]} 20. Rad1 {[%emt 0:00:07]} Re8 {[%emt 0:00:16]} 21. Bb2 {[%emt 0:00:03]} Qb6 {[%emt 0:00:17]} 22. Bxd4 {[%emt 0:00:05]} Nxd4 {[%emt 0:00:05]} 23. Qxh7+ {[%emt 0:00:02]} Kf8 {[%emt 0:00:01]} 24. Qh8+ {[%emt 0:00:01]} Ke7 {[%emt 0:00:01]} 25. Qxg7 {[%emt 0:00:02]} Ne6 {[%emt 0:00:02]} 26. Qh6 {[%emt 0:00:06]} Rcc8 {[%emt 0:00:23]} 27. Qh4+ {[%emt 0:00:04]} Kf8 {[%emt 0:00:02]} 28. Rd7 {[%emt 0:00:02]} Qb2 {[%emt 0:00:13]} 29. Rg1 {[%emt 0:00:07]} Red8 {[%emt 0:00:10]} 30. Qe7# {[%emt 0:00:03]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "3.8"]
[White "Shuvalova, Polina"]
[Black "Abdumalik, Zhansaya"]
[Result "1/2-1/2"]
[ECO "D80"]
[WhiteElo "2476"]
[BlackElo "2472"]
[Annotator "ChessBase"]
[PlyCount "133"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:01]} d5 {[%emt 0:00:00]} 4. Nf3 {[%emt 0:00:01]} Bg7 {[%emt 0:00:00]} 5. Bg5 {[%emt 0:00:01]} Ne4 {[%emt 0:00:27]} 6. Bf4 {[%emt 0:00:04]} Nxc3 {[%emt 0:00:27]} 7. bxc3 {[%emt 0:00:00]} O-O {[%emt 0:00:08]} 8. e3 {[%emt 0:00:14]} c5 {[%emt 0:00:11]} 9. cxd5 {[%emt 0:00:05]} Qxd5 {[%emt 0:00:11]} 10. Be2 {[%emt 0:00:02]} cxd4 {[%emt 0:00:29]} 11. cxd4 {[%emt 0:00:01]} Nc6 {[%emt 0:00:04]} 12. O-O {[%emt 0:00:03]} Bf5 {[%emt 0:00:01]} 13. Qa4 {[%emt 0:00:01]} Qa5 {[%emt 0:00:02]} 14. Qxa5 {[%emt 0:00:02]} Nxa5 {[%emt 0:00:01]} 15. Nd2 {[%emt 0:00:07]} Rac8 {[%emt 0:00:19]} 16. g4 {[%emt 0:00:02]} Be6 {[%emt 0:01:21]} 17. Rfc1 {[%emt 0:00:11]} Rxc1+ {[%emt 0:00:31]} 18. Rxc1 {[%emt 0:00:01]} Rc8 {[%emt 0:00:00]} 19. Rxc8+ {[%emt 0:00:01]} Bxc8 {[%emt 0:00:01]} 20. d5 {[%emt 0:00:01]} e5 {[%emt 0:00:33]} 21. Bg3 {[%emt 0:00:59]} Kf8 {[%emt 0:00:18]} 22. g5 {[%emt 0:00:57]} Ke7 {[%emt 0:00:06]} 23. e4 {[%emt 0:01:33]} a6 {[%emt 0:00:43]} 24. f3 {[%emt 0:00:18]} b5 {[%emt 0:00:12]} 25. Kf1 {[%emt 0:02:03]} Bh3+ {[%emt 0:00:52]} 26. Ke1 {[%emt 0:00:03]} Kd6 {[%emt 0:00:22]} 27. Bf2 {[%emt 0:00:52]} h6 {[%emt 0:00:10]} 28. Be3 {[%emt 0:01:04]} hxg5 {[%emt 0:00:07]} 29. Bxg5 {[%emt 0:00:00]} Nb7 {[%emt 0:00:23]} 30. Nb3 {[%emt 0:00:08]} f6 {[%emt 0:00:33]} 31. Be3 {[%emt 0:00:02]} f5 {[%emt 0:00:05]} 32. Kd2 {[%emt 0:00:53]} f4 {[%emt 0:00:13]} 33. Ba7 {[%emt 0:00:14]} Kc7 {[%emt 0:00:19]} 34. Kc3 {[%emt 0:00:10]} Bf8 {[%emt 0:00:05]} 35. Bf2 {[%emt 0:00:38]} Be7 {[%emt 0:00:13]} 36. Kc2 {[%emt 0:00:25]} g5 {[%emt 0:00:07]} 37. Kc3 {[%emt 0:00:04]} Bd7 {[%emt 0:00:06]} 38. Nc1 {[%emt 0:00:14]} Nc5 {[%emt 0:00:47]} 39. Nd3 {[%emt 0:00:21]} Nxd3 {[%emt 0:00:16]} 40. Kxd3 {[%emt 0:00:10]} a5 {[%emt 0:00:12]} 41. Be1 {[%emt 0:00:25]} Kb6 {[%emt 0:00:04]} 42. Bc3 {[%emt 0:00:16]} Bd6 {[%emt 0:00:07]} 43. Kc2 {[%emt 0:00:15]} Bc8 {[%emt 0:00:11]} 44. Kb3 {[%emt 0:00:18]} Ba6 {[%emt 0:00:40]} 45. Be1 {[%emt 0:00:19]} a4+ {[%emt 0:00:28]} 46. Kb2 {[%emt 0:00:01]} Bc5 {[%emt 0:00:11]} 47. h4 {[%emt 0:00:06]} gxh4 {[%emt 0:00:27]} 48. Bxh4 {[%emt 0:00:00]} Bd4+ {[%emt 0:00:00]} 49. Kc2 {[%emt 0:00:01]} Bc8 {[%emt 0:00:28]} 50. Bd8+ {[%emt 0:00:06]} Kc5 {[%emt 0:00:03]} 51. Be7+ {[%emt 0:00:02]} Kb6 {[%emt 0:00:01]} 52. Bd8+ {[%emt 0:00:02]} Kc5 {[%emt 0:00:33]} 53. Be7+ {[%emt 0:00:02]} Kb6 {[%emt 0:00:01]} 54. Bd6 {[%emt 0:00:05]} Bd7 {[%emt 0:00:03]} 55. Be7 {[%emt 0:00:06]} Ka5 {[%emt 0:00:11]} 56. Bd8+ {[%emt 0:00:03]} Kb4 {[%emt 0:00:04]} 57. Be7+ {[%emt 0:00:07]} Ka5 {[%emt 0:00:01]} 58. a3 {[%emt 0:00:02]} Kb6 {[%emt 0:00:04]} 59. Bd8+ {[%emt 0:00:01]} Kc5 {[%emt 0:00:01]} 60. Be7+ {[%emt 0:00:01]} Kb6 {[%emt 0:00:01]} 61. Bd8+ {[%emt 0:00:06]} Kc5 {[%emt 0:00:02]} 62. Bf1 {[%emt 0:00:12]} Kd6 {[%emt 0:00:05]} 63. Ba5 {[%emt 0:00:09]} Bc5 {[%emt 0:00:13]} 64. Kb2 {[%emt 0:00:01]} Bd4+ {[%emt 0:00:01]} 65. Kc2 {[%emt 0:00:02]} Bc5 {[%emt 0:00:01]} 66. Kb2 {[%emt 0:00:06]} Bd4+ {[%emt 0:00:01]} 67. Kc2 {[%emt 0:00:08]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "3.9"]
[White "Bjerre, Jonas Buhl"]
[Black "Mendonca, Leon Luke"]
[Result "0-1"]
[ECO "D78"]
[WhiteElo "2550"]
[BlackElo "2549"]
[Annotator "ChessBase"]
[PlyCount "100"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:02]} 4. g3 {[%emt 0:00:01]} g6 {[%emt 0:00:51]} 5. Bg2 {[%emt 0:00:04]} Bg7 {[%emt 0:00:07]} 6. O-O {[%emt 0:00:03]} O-O {[%emt 0:00:01]} 7. b3 {[%emt 0:00:05]} a5 {[%emt 0:00:12]} 8. Nc3 {[%emt 0:00:08]} Bf5 {[%emt 0:02:33]} 9. Bb2 {[%emt 0:00:33]} Ne4 {[%emt 0:00:14]} 10. Ne5 {[%emt 0:00:35]} Nxc3 {[%emt 0:02:12]} 11. Bxc3 {[%emt 0:00:03]} Bxe5 {[%emt 0:00:50]} 12. dxe5 {[%emt 0:00:17]} dxc4 {[%emt 0:00:02]} 13. Qc1 {[%emt 0:01:41]} cxb3 {[%emt 0:00:03]} 14. axb3 {[%emt 0:00:06]} Nd7 {[%emt 0:00:05]} 15. e4 {[%emt 0:00:49]} Be6 {[%emt 0:00:08]} 16. f4 {[%emt 0:00:39]} Qb6+ {[%emt 0:01:02]} 17. Kh1 {[%emt 0:00:23]} f5 {[%emt 0:00:05]} 18. exf6 {[%emt 0:00:39]} exf6 {[%emt 0:00:01]} 19. f5 {[%emt 0:00:29]} gxf5 {[%emt 0:00:26]} 20. exf5 {[%emt 0:00:56]} Bxb3 {[%emt 0:00:18]} 21. Rb1 {[%emt 0:00:41]} a4 {[%emt 0:00:09]} 22. g4 {[%emt 0:00:57]} Rae8 {[%emt 0:00:39]} 23. g5 {[%emt 0:00:16]} Qe3 {[%emt 0:00:06]} 24. Bd2 {[%emt 0:00:54]} Qc5 {[%emt 0:00:12]} 25. Qxc5 {[%emt 0:00:46]} Nxc5 {[%emt 0:00:00]} 26. Bb4 {[%emt 0:00:01]} Re5 {[%emt 0:00:15]} 27. Bc3 {[%emt 0:00:08]} Ree8 {[%emt 0:00:32]} 28. Bb4 {[%emt 0:00:41]} b6 {[%emt 0:00:16]} 29. Bxc6 {[%emt 0:00:14]} Rc8 {[%emt 0:00:06]} 30. Bg2 {[%emt 0:00:06]} fxg5 {[%emt 0:00:02]} 31. f6 {[%emt 0:00:01]} Kf7 {[%emt 0:00:11]} 32. Bf3 {[%emt 0:00:06]} Kg6 {[%emt 0:00:07]} 33. Bg4 {[%emt 0:00:05]} Rcd8 {[%emt 0:00:25]} 34. Bf5+ {[%emt 0:00:08]} Kf7 {[%emt 0:00:01]} 35. Bg4 {[%emt 0:00:05]} Kg6 {[%emt 0:00:19]} 36. Rbe1 {[%emt 0:00:03]} Rde8 {[%emt 0:00:16]} 37. Rc1 {[%emt 0:00:14]} Re5 {[%emt 0:00:03]} 38. Bc3 {[%emt 0:00:02]} Rd5 {[%emt 0:00:05]} 39. Rce1 {[%emt 0:00:01]} h5 {[%emt 0:00:04]} 40. Bf3 {[%emt 0:00:02]} Rf5 {[%emt 0:00:02]} 41. Kg1 {[%emt 0:00:05]} g4 {[%emt 0:00:03]} 42. Bc6 {[%emt 0:00:03]} Rxf1+ {[%emt 0:00:03]} 43. Kxf1 {[%emt 0:00:02]} a3 {[%emt 0:00:10]} 44. Re7 {[%emt 0:00:03]} Rxf6+ {[%emt 0:00:05]} 45. Bxf6 {[%emt 0:00:04]} Kxf6 {[%emt 0:00:00]} 46. Ra7 {[%emt 0:00:04]} a2 {[%emt 0:00:01]} 47. Ra3 {[%emt 0:00:04]} Ke5 {[%emt 0:00:03]} 48. Ke2 {[%emt 0:00:01]} Kd4 {[%emt 0:00:00]} 49. Kd2 {[%emt 0:00:01]} h4 {[%emt 0:00:01]} 50. Kc1 {[%emt 0:00:30]} Kc3 {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "3.10"]
[White "Gukesh D"]
[Black "Keymer, Vincent"]
[Result "1-0"]
[ECO "D41"]
[WhiteElo "2578"]
[BlackElo "2591"]
[Annotator "ChessBase"]
[PlyCount "163"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. c4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 2. e4 {[%emt 0:00:07]} d5 {[%emt 0:00:00]} 3. cxd5 {[%emt 0:00:02]} cxd5 {[%emt 0:00:00]} 4. exd5 {[%emt 0:00:01]} Nf6 {[%emt 0:00:02]} 5. Nc3 {[%emt 0:00:03]} Nxd5 {[%emt 0:00:08]} 6. Nf3 {[%emt 0:00:02]} Nc6 {[%emt 0:00:03]} 7. Bc4 {[%emt 0:00:22]} e6 {[%emt 0:00:24]} 8. O-O {[%emt 0:00:05]} Be7 {[%emt 0:00:02]} 9. d4 {[%emt 0:00:36]} O-O {[%emt 0:00:12]} 10. Qe2 {[%emt 0:00:50]} Nxc3 {[%emt 0:01:05]} 11. bxc3 {[%emt 0:00:02]} b6 {[%emt 0:00:07]} 12. Bd3 {[%emt 0:00:38]} Bb7 {[%emt 0:00:06]} 13. Qe4 {[%emt 0:01:31]} g6 {[%emt 0:00:03]} 14. Bh6 {[%emt 0:00:02]} Re8 {[%emt 0:00:03]} 15. Qg4 {[%emt 0:00:19]} Bf8 {[%emt 0:02:24]} 16. Bg5 {[%emt 0:00:31]} Qc8 {[%emt 0:00:31]} 17. Rac1 {[%emt 0:00:32]} Bg7 {[%emt 0:00:36]} 18. Qh4 {[%emt 0:00:06]} Qc7 {[%emt 0:01:05]} 19. Rfe1 {[%emt 0:01:23]} Ne7 {[%emt 0:00:56]} 20. Bf4 {[%emt 0:00:01]} Qd8 {[%emt 0:00:22]} 21. Qg3 {[%emt 0:03:16]} Nd5 {[%emt 0:00:33]} 22. Bg5 {[%emt 0:00:21]} Qc7 {[%emt 0:00:14]} 23. Qh4 {[%emt 0:00:38]} Rac8 {[%emt 0:00:04]} 24. c4 {[%emt 0:00:17]} Ne7 {[%emt 0:00:09]} 25. Ne5 {[%emt 0:00:06]} Nc6 {[%emt 0:00:30]} 26. Ng4 {[%emt 0:00:03]} f5 {[%emt 0:00:48]} 27. Nf6+ {[%emt 0:00:02]} Bxf6 {[%emt 0:00:01]} 28. Bxf6 {[%emt 0:00:00]} Qf7 {[%emt 0:00:01]} 29. d5 {[%emt 0:00:12]} Nb4 {[%emt 0:00:10]} 30. Bb1 {[%emt 0:00:05]} exd5 {[%emt 0:00:10]} 31. Rxe8+ {[%emt 0:00:02]} Qxe8 {[%emt 0:00:31]} 32. Qh6 {[%emt 0:00:09]} Qf8 {[%emt 0:00:13]} 33. Qh4 {[%emt 0:00:09]} Qe8 {[%emt 0:00:21]} 34. Qh6 {[%emt 0:00:05]} Qf7 {[%emt 0:00:07]} 35. Bc3 {[%emt 0:00:04]} Rxc4 {[%emt 0:00:12]} 36. a3 {[%emt 0:00:04]} Na6 {[%emt 0:00:35]} 37. Bd3 {[%emt 0:00:07]} Rc8 {[%emt 0:00:06]} 38. Bb2 {[%emt 0:00:04]} Nc5 {[%emt 0:00:02]} 39. Bf1 {[%emt 0:00:03]} Rd8 {[%emt 0:00:05]} 40. Qh4 {[%emt 0:00:02]} Re8 {[%emt 0:00:04]} 41. Qd4 {[%emt 0:00:02]} Kf8 {[%emt 0:00:06]} 42. Qh8+ {[%emt 0:00:02]} Ke7 {[%emt 0:00:02]} 43. Re1+ {[%emt 0:00:10]} Ne6 {[%emt 0:00:07]} 44. Qe5 {[%emt 0:00:07]} Kf8 {[%emt 0:00:08]} 45. Bb5 {[%emt 0:00:02]} Rc8 {[%emt 0:00:08]} 46. Qd6+ {[%emt 0:00:12]} Qe7 {[%emt 0:00:03]} 47. Rxe6 {[%emt 0:00:04]} Qxd6 {[%emt 0:00:02]} 48. Rxd6 {[%emt 0:00:01]} Rc2 {[%emt 0:00:05]} 49. Rd8+ {[%emt 0:00:04]} Ke7 {[%emt 0:00:02]} 50. Rd7+ {[%emt 0:00:01]} Ke6 {[%emt 0:00:00]} 51. Rxb7 {[%emt 0:00:01]} Rxb2 {[%emt 0:00:01]} 52. Bf1 {[%emt 0:00:01]} d4 {[%emt 0:00:13]} 53. Rxa7 {[%emt 0:00:04]} Rb1 {[%emt 0:00:02]} 54. Ra8 {[%emt 0:00:05]} Ke7 {[%emt 0:00:08]} 55. Ra4 {[%emt 0:00:02]} Rd1 {[%emt 0:00:05]} 56. g3 {[%emt 0:00:04]} d3 {[%emt 0:00:13]} 57. Rd4 {[%emt 0:00:03]} d2 {[%emt 0:00:07]} 58. Kg2 {[%emt 0:00:01]} Ke6 {[%emt 0:00:04]} 59. Be2 {[%emt 0:00:08]} Ra1 {[%emt 0:00:04]} 60. Rxd2 {[%emt 0:00:01]} Rxa3 {[%emt 0:00:01]} 61. Rb2 {[%emt 0:00:01]} f4 {[%emt 0:00:01]} 62. Rxb6+ {[%emt 0:00:01]} Ke5 {[%emt 0:00:05]} 63. Rb5+ {[%emt 0:00:01]} Kf6 {[%emt 0:00:00]} 64. gxf4 {[%emt 0:00:02]} Rc3 {[%emt 0:00:03]} 65. Bf3 {[%emt 0:00:02]} h6 {[%emt 0:00:05]} 66. Rb6+ {[%emt 0:00:08]} Kf5 {[%emt 0:00:03]} 67. Kg3 {[%emt 0:00:07]} h5 {[%emt 0:00:02]} 68. Rb5+ {[%emt 0:00:09]} Kf6 {[%emt 0:00:01]} 69. h4 {[%emt 0:00:03]} Ra3 {[%emt 0:00:08]} 70. f5 {[%emt 0:00:07]} gxf5 {[%emt 0:00:05]} 71. Rb6+ {[%emt 0:00:03]} Kg7 {[%emt 0:00:05]} 72. Kf4 {[%emt 0:00:18]} Ra2 {[%emt 0:00:29]} 73. Kg5 {[%emt 0:00:13]} Rxf2 {[%emt 0:00:01]} 74. Rb7+ {[%emt 0:00:01]} Kg8 {[%emt 0:00:05]} 75. Kg6 {[%emt 0:00:15]} Kf8 {[%emt 0:00:06]} 76. Kf6 {[%emt 0:00:01]} Ke8 {[%emt 0:00:01]} 77. Bxh5+ {[%emt 0:00:01]} Kd8 {[%emt 0:00:01]} 78. Bg6 {[%emt 0:00:03]} f4 {[%emt 0:00:02]} 79. h5 {[%emt 0:00:01]} f3 {[%emt 0:00:09]} 80. h6 {[%emt 0:00:03]} Rh2 {[%emt 0:00:04]} 81. Kg7 {[%emt 0:00:06]} f2 {[%emt 0:00:14]} 82. Rf7 {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "4.1"]
[White "Zhu, Jiner"]
[Black "Keymer, Vincent"]
[Result "1/2-1/2"]
[ECO "C78"]
[WhiteElo "2459"]
[BlackElo "2591"]
[Annotator "ChessBase"]
[PlyCount "118"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:03]} a6 {[%emt 0:00:00]} 4. Ba4 {[%emt 0:00:01]} Nf6 {[%emt 0:00:00]} 5. O-O {[%emt 0:00:02]} Bc5 {[%emt 0:00:01]} 6. d3 {[%emt 0:00:09]} d6 {[%emt 0:00:13]} 7. h3 {[%emt 0:00:05]} h6 {[%emt 0:00:10]} 8. c3 {[%emt 0:00:03]} O-O {[%emt 0:00:43]} 9. Nbd2 {[%emt 0:00:14]} Ba7 {[%emt 0:00:26]} 10. Re1 {[%emt 0:00:10]} Ne7 {[%emt 0:00:21]} 11. Nf1 {[%emt 0:00:05]} Ng6 {[%emt 0:00:08]} 12. Ng3 {[%emt 0:00:23]} Nh7 {[%emt 0:00:42]} 13. d4 {[%emt 0:01:30]} Ng5 {[%emt 0:00:52]} 14. Be3 {[%emt 0:01:22]} Qf6 {[%emt 0:00:41]} 15. Nh2 {[%emt 0:00:55]} Nf4 {[%emt 0:01:05]} 16. dxe5 {[%emt 0:04:19]} dxe5 {[%emt 0:00:31]} 17. Bxa7 {[%emt 0:00:23]} Rxa7 {[%emt 0:00:02]} 18. Ng4 {[%emt 0:00:47]} Bxg4 {[%emt 0:02:01]} 19. Qxg4 {[%emt 0:00:02]} b5 {[%emt 0:00:21]} 20. Bb3 {[%emt 0:00:10]} c5 {[%emt 0:00:03]} 21. Bd5 {[%emt 0:00:31]} g6 {[%emt 0:00:43]} 22. h4 {[%emt 0:00:12]} Nh7 {[%emt 0:00:37]} 23. h5 {[%emt 0:00:09]} Kh8 {[%emt 0:00:05]} 24. Rad1 {[%emt 0:00:08]} Ng5 {[%emt 0:00:34]} 25. Kf1 {[%emt 0:00:06]} c4 {[%emt 0:00:27]} 26. Rd2 {[%emt 0:00:03]} Rc7 {[%emt 0:00:15]} 27. Re3 {[%emt 0:00:02]} Kh7 {[%emt 0:00:10]} 28. b3 {[%emt 0:00:02]} Rd8 {[%emt 0:00:07]} 29. bxc4 {[%emt 0:00:11]} Rxc4 {[%emt 0:00:11]} 30. Qd1 {[%emt 0:00:11]} Rcc8 {[%emt 0:00:07]} 31. Bb7 {[%emt 0:00:08]} Rb8 {[%emt 0:00:04]} 32. Bd5 {[%emt 0:00:02]} Rd6 {[%emt 0:00:17]} 33. hxg6+ {[%emt 0:00:10]} Nxg6 {[%emt 0:00:17]} 34. Nf5 {[%emt 0:00:01]} Rdd8 {[%emt 0:00:05]} 35. g3 {[%emt 0:00:01]} Ne7 {[%emt 0:00:15]} 36. Nxe7 {[%emt 0:00:01]} Qxe7 {[%emt 0:00:00]} 37. Qg4 {[%emt 0:00:01]} Qf6 {[%emt 0:00:11]} 38. Red3 {[%emt 0:00:01]} b4 {[%emt 0:00:08]} 39. cxb4 {[%emt 0:00:05]} Rxb4 {[%emt 0:00:06]} 40. Kg2 {[%emt 0:00:02]} a5 {[%emt 0:00:11]} 41. a3 {[%emt 0:00:01]} Rbb8 {[%emt 0:00:02]} 42. Bc4 {[%emt 0:00:04]} Rxd3 {[%emt 0:00:05]} 43. Bxd3 {[%emt 0:00:02]} Rd8 {[%emt 0:00:03]} 44. Rd1 {[%emt 0:00:03]} Ne6 {[%emt 0:00:06]} 45. Bc4 {[%emt 0:00:03]} Nd4 {[%emt 0:00:03]} 46. Qh5 {[%emt 0:00:03]} Kg7 {[%emt 0:00:08]} 47. Rh1 {[%emt 0:00:01]} Rd6 {[%emt 0:00:05]} 48. Rh4 {[%emt 0:00:02]} Qe7 {[%emt 0:00:06]} 49. Rh1 {[%emt 0:00:06]} Rg6 {[%emt 0:00:03]} 50. Rb1 {[%emt 0:00:06]} Rg5 {[%emt 0:00:10]} 51. Qd1 {[%emt 0:00:07]} Rg6 {[%emt 0:00:05]} 52. Bd5 {[%emt 0:00:01]} Qxa3 {[%emt 0:00:03]} 53. Rb7 {[%emt 0:00:03]} Ne6 {[%emt 0:00:05]} 54. Bxe6 {[%emt 0:00:06]} Rxe6 {[%emt 0:00:00]} 55. Qg4+ {[%emt 0:00:01]} Rg6 {[%emt 0:00:03]} 56. Qf5 {[%emt 0:00:02]} Rf6 {[%emt 0:00:00]} 57. Qg4+ {[%emt 0:00:03]} Rg6 {[%emt 0:00:19]} 58. Qf5 {[%emt 0:00:03]} Rf6 {[%emt 0:00:04]} 59. Qg4+ {[%emt 0:00:02]} Rg6 {[%emt 0:00:01]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "4.2"]
[White "Mendonca, Leon Luke"]
[Black "Gukesh D"]
[Result "1/2-1/2"]
[ECO "E54"]
[WhiteElo "2549"]
[BlackElo "2578"]
[Annotator "ChessBase"]
[PlyCount "147"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:02]} Nf6 {[%emt 0:00:00]} 3. c4 {[%emt 0:00:03]} e6 {[%emt 0:00:06]} 4. Nc3 {[%emt 0:00:03]} c5 {[%emt 0:00:46]} 5. e3 {[%emt 0:00:39]} cxd4 {[%emt 0:00:35]} 6. exd4 {[%emt 0:00:02]} Bb4 {[%emt 0:00:03]} 7. Bd3 {[%emt 0:00:27]} dxc4 {[%emt 0:00:13]} 8. Bxc4 {[%emt 0:00:01]} O-O {[%emt 0:00:02]} 9. O-O {[%emt 0:00:14]} Nbd7 {[%emt 0:00:23]} 10. Bg5 {[%emt 0:00:21]} Bxc3 {[%emt 0:00:34]} 11. bxc3 {[%emt 0:00:02]} Qc7 {[%emt 0:00:12]} 12. Qe2 {[%emt 0:00:37]} b6 {[%emt 0:00:13]} 13. Rac1 {[%emt 0:00:49]} Bb7 {[%emt 0:00:13]} 14. Bd3 {[%emt 0:00:23]} Ng4 {[%emt 0:01:40]} 15. Be4 {[%emt 0:00:15]} Bxe4 {[%emt 0:00:05]} 16. Qxe4 {[%emt 0:00:00]} Ngf6 {[%emt 0:00:01]} 17. Qe2 {[%emt 0:00:15]} Qb7 {[%emt 0:00:37]} 18. c4 {[%emt 0:00:22]} Qe4 {[%emt 0:00:21]} 19. Qxe4 {[%emt 0:01:49]} Nxe4 {[%emt 0:00:01]} 20. Be3 {[%emt 0:00:06]} Rac8 {[%emt 0:00:07]} 21. a4 {[%emt 0:00:16]} Rc6 {[%emt 0:01:13]} 22. Rc2 {[%emt 0:00:23]} Rfc8 {[%emt 0:00:11]} 23. Rfc1 {[%emt 0:00:01]} Nd6 {[%emt 0:00:14]} 24. Nd2 {[%emt 0:02:25]} Nf6 {[%emt 0:00:02]} 25. Kf1 {[%emt 0:00:30]} Nd5 {[%emt 0:01:30]} 26. Ke2 {[%emt 0:00:08]} a5 {[%emt 0:00:02]} 27. c5 {[%emt 0:00:17]} Nf5 {[%emt 0:00:56]} 28. Nb3 {[%emt 0:00:13]} Kf8 {[%emt 0:00:46]} 29. Rc4 {[%emt 0:00:53]} Nd6 {[%emt 0:00:45]} 30. R4c2 {[%emt 0:00:05]} Nf5 {[%emt 0:00:10]} 31. Kd2 {[%emt 0:00:17]} Nb4 {[%emt 0:00:15]} 32. Rb2 {[%emt 0:00:21]} Nd5 {[%emt 0:00:14]} 33. cxb6 {[%emt 0:00:15]} Rxc1 {[%emt 0:00:01]} 34. Nxc1 {[%emt 0:00:00]} Nd6 {[%emt 0:00:01]} 35. Ke2 {[%emt 0:00:09]} Rb8 {[%emt 0:00:08]} 36. b7 {[%emt 0:00:07]} Rxb7 {[%emt 0:00:08]} 37. Rxb7 {[%emt 0:00:01]} Nxb7 {[%emt 0:00:00]} 38. Bd2 {[%emt 0:00:02]} Nb6 {[%emt 0:00:12]} 39. Nb3 {[%emt 0:00:02]} Nxa4 {[%emt 0:00:04]} 40. Nxa5 {[%emt 0:00:01]} Nd8 {[%emt 0:00:03]} 41. Bb4+ {[%emt 0:00:05]} Ke8 {[%emt 0:00:02]} 42. Kd3 {[%emt 0:00:03]} Nb6 {[%emt 0:00:01]} 43. Nc4 {[%emt 0:00:04]} Nd5 {[%emt 0:00:02]} 44. Bd2 {[%emt 0:00:03]} f6 {[%emt 0:00:02]} 45. g3 {[%emt 0:00:02]} Nc6 {[%emt 0:00:02]} 46. Nd6+ {[%emt 0:00:09]} Kd7 {[%emt 0:00:02]} 47. Ne4 {[%emt 0:00:00]} Ke7 {[%emt 0:00:06]} 48. Kc4 {[%emt 0:00:04]} Kf7 {[%emt 0:00:07]} 49. h3 {[%emt 0:00:11]} Nce7 {[%emt 0:00:03]} 50. Nd6+ {[%emt 0:00:02]} Kg6 {[%emt 0:00:02]} 51. Kd3 {[%emt 0:00:05]} h5 {[%emt 0:00:02]} 52. Ne4 {[%emt 0:00:10]} Nf5 {[%emt 0:00:10]} 53. Nc5 {[%emt 0:00:03]} Kf7 {[%emt 0:00:04]} 54. Ne4 {[%emt 0:00:01]} g5 {[%emt 0:00:13]} 55. Nc5 {[%emt 0:00:13]} h4 {[%emt 0:00:08]} 56. g4 {[%emt 0:00:02]} Nfe7 {[%emt 0:00:04]} 57. Ke4 {[%emt 0:00:03]} Ng6 {[%emt 0:00:15]} 58. Nd3 {[%emt 0:00:01]} Nde7 {[%emt 0:00:04]} 59. f4 {[%emt 0:00:02]} gxf4 {[%emt 0:00:05]} 60. Nxf4 {[%emt 0:00:03]} f5+ {[%emt 0:00:04]} 61. gxf5 {[%emt 0:00:06]} Nxf5 {[%emt 0:00:05]} 62. Nxg6 {[%emt 0:00:04]} Kxg6 {[%emt 0:00:01]} 63. Ke5 {[%emt 0:00:03]} Ng7 {[%emt 0:00:08]} 64. Be1 {[%emt 0:00:03]} Kg5 {[%emt 0:00:07]} 65. Bf2 {[%emt 0:00:02]} Nf5 {[%emt 0:00:05]} 66. Kxe6 {[%emt 0:00:21]} Kf4 {[%emt 0:00:05]} 67. d5 {[%emt 0:00:04]} Ke4 {[%emt 0:00:01]} 68. Bg1 {[%emt 0:00:19]} Ng7+ {[%emt 0:00:04]} 69. Kf6 {[%emt 0:00:02]} Kxd5 {[%emt 0:00:10]} 70. Bf2 {[%emt 0:00:14]} Ke4 {[%emt 0:00:06]} 71. Bxh4 {[%emt 0:00:02]} Nh5+ {[%emt 0:00:01]} 72. Kg5 {[%emt 0:00:08]} Nf4 {[%emt 0:00:00]} 73. Kg4 {[%emt 0:00:00]} Nxh3 {[%emt 0:00:01]} 74. Kxh3 {[%emt 0:00:00]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "4.3"]
[White "Abdumalik, Zhansaya"]
[Black "Bjerre, Jonas Buhl"]
[Result "0-1"]
[ECO "B90"]
[WhiteElo "2472"]
[BlackElo "2550"]
[Annotator "ChessBase"]
[PlyCount "92"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:00]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 6. h3 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 7. Nde2 {[%emt 0:00:02]} h5 {[%emt 0:00:01]} 8. g3 {[%emt 0:00:01]} Be7 {[%emt 0:00:01]} 9. Bg2 {[%emt 0:00:01]} b5 {[%emt 0:00:01]} 10. O-O {[%emt 0:02:03]} Nbd7 {[%emt 0:00:23]} 11. a4 {[%emt 0:00:07]} b4 {[%emt 0:00:21]} 12. Nd5 {[%emt 0:00:01]} a5 {[%emt 0:01:10]} 13. Nxe7 {[%emt 0:01:11]} Qxe7 {[%emt 0:00:04]} 14. c3 {[%emt 0:00:03]} Nc5 {[%emt 0:00:56]} 15. Bg5 {[%emt 0:00:38]} Qe6 {[%emt 0:00:39]} 16. f4 {[%emt 0:00:04]} Ba6 {[%emt 0:01:12]} 17. cxb4 {[%emt 0:01:13]} axb4 {[%emt 0:00:11]} 18. Rc1 {[%emt 0:01:28]} Rc8 {[%emt 0:02:30]} 19. fxe5 {[%emt 0:01:17]} dxe5 {[%emt 0:00:04]} 20. Bxf6 {[%emt 0:00:16]} gxf6 {[%emt 0:00:03]} 21. Qd2 {[%emt 0:00:14]} O-O {[%emt 0:00:38]} 22. Qh6 {[%emt 0:00:36]} f5 {[%emt 0:01:09]} 23. Qxh5 {[%emt 0:00:39]} Qg6 {[%emt 0:00:35]} 24. Bf3 {[%emt 0:00:28]} Qxh5 {[%emt 0:00:55]} 25. Bxh5 {[%emt 0:00:01]} fxe4 {[%emt 0:00:06]} 26. Rf6 {[%emt 0:00:21]} Bxe2 {[%emt 0:00:16]} 27. Bxe2 {[%emt 0:00:01]} Nxa4 {[%emt 0:00:07]} 28. Rxc8 {[%emt 0:00:18]} Rxc8 {[%emt 0:00:02]} 29. b3 {[%emt 0:00:00]} Kg7 {[%emt 0:00:24]} 30. Rd6 {[%emt 0:00:27]} Rc1+ {[%emt 0:00:16]} 31. Kf2 {[%emt 0:00:05]} Nc5 {[%emt 0:00:04]} 32. Rb6 {[%emt 0:00:30]} Rc2 {[%emt 0:00:11]} 33. Kf1 {[%emt 0:00:11]} Nd3 {[%emt 0:00:07]} 34. Rd6 {[%emt 0:00:18]} Rc3 {[%emt 0:00:07]} 35. Bd1 {[%emt 0:00:05]} Nc5 {[%emt 0:00:08]} 36. Kf2 {[%emt 0:00:06]} Nxb3 {[%emt 0:00:04]} 37. Rd5 {[%emt 0:00:01]} Nc5 {[%emt 0:00:04]} 38. Be2 {[%emt 0:00:02]} f6 {[%emt 0:00:03]} 39. h4 {[%emt 0:00:07]} b3 {[%emt 0:00:01]} 40. Rd2 {[%emt 0:00:03]} Rc2 {[%emt 0:00:03]} 41. Rd6 {[%emt 0:00:04]} b2 {[%emt 0:00:06]} 42. Rb6 {[%emt 0:00:01]} Na4 {[%emt 0:00:02]} 43. Rb7+ {[%emt 0:00:01]} Kh6 {[%emt 0:00:03]} 44. g4 {[%emt 0:00:24]} Nc3 {[%emt 0:00:03]} 45. g5+ {[%emt 0:00:02]} fxg5 {[%emt 0:00:02]} 46. hxg5+ {[%emt 0:00:03]} Kxg5 {[%emt 0:00:04]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "4.4"]
[White "Khademalsharieh, Sarasadat"]
[Black "Shuvalova, Polina"]
[Result "0-1"]
[ECO "D29"]
[WhiteElo "2494"]
[BlackElo "2476"]
[Annotator "ChessBase"]
[PlyCount "92"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 4. Nc3 {[%emt 0:00:01]} dxc4 {[%emt 0:00:04]} 5. e3 {[%emt 0:00:14]} a6 {[%emt 0:00:13]} 6. Bxc4 {[%emt 0:00:02]} b5 {[%emt 0:00:16]} 7. Bb3 {[%emt 0:00:04]} Bb7 {[%emt 0:00:22]} 8. O-O {[%emt 0:00:06]} c5 {[%emt 0:00:02]} 9. Qe2 {[%emt 0:01:27]} Nbd7 {[%emt 0:00:08]} 10. Rd1 {[%emt 0:00:18]} Be7 {[%emt 0:01:05]} 11. d5 {[%emt 0:02:21]} exd5 {[%emt 0:00:19]} 12. Nxd5 {[%emt 0:00:02]} Nxd5 {[%emt 0:00:15]} 13. Bxd5 {[%emt 0:00:01]} Bxd5 {[%emt 0:00:11]} 14. Rxd5 {[%emt 0:00:02]} Qc7 {[%emt 0:00:32]} 15. e4 {[%emt 0:00:07]} O-O {[%emt 0:00:20]} 16. e5 {[%emt 0:00:49]} Nb6 {[%emt 0:00:40]} 17. Rd1 {[%emt 0:00:02]} Rad8 {[%emt 0:00:06]} 18. Bf4 {[%emt 0:00:19]} c4 {[%emt 0:00:11]} 19. h4 {[%emt 0:00:10]} h6 {[%emt 0:00:36]} 20. Nd4 {[%emt 0:00:56]} Qc8 {[%emt 0:01:30]} 21. Qe4 {[%emt 0:00:55]} Bc5 {[%emt 0:00:16]} 22. Nf5 {[%emt 0:01:03]} Qe6 {[%emt 0:00:08]} 23. h5 {[%emt 0:00:03]} Kh8 {[%emt 0:02:23]} 24. Bg3 {[%emt 0:00:16]} Rfe8 {[%emt 0:00:26]} 25. Qg4 {[%emt 0:00:24]} Bf8 {[%emt 0:00:04]} 26. Qf3 {[%emt 0:00:35]} b4 {[%emt 0:00:28]} 27. Nd6 {[%emt 0:00:37]} Bxd6 {[%emt 0:00:02]} 28. exd6 {[%emt 0:00:02]} Nd7 {[%emt 0:00:07]} 29. Qc6 {[%emt 0:00:28]} a5 {[%emt 0:00:12]} 30. Rac1 {[%emt 0:00:01]} Rc8 {[%emt 0:00:06]} 31. Qf3 {[%emt 0:00:18]} Rc5 {[%emt 0:00:30]} 32. Rd4 {[%emt 0:00:32]} Nf6 {[%emt 0:00:17]} 33. Rh4 {[%emt 0:00:19]} c3 {[%emt 0:00:12]} 34. bxc3 {[%emt 0:00:01]} bxc3 {[%emt 0:00:02]} 35. Kh2 {[%emt 0:00:01]} c2 {[%emt 0:00:05]} 36. Bf4 {[%emt 0:00:08]} Rd8 {[%emt 0:00:23]} 37. Qe3 {[%emt 0:00:10]} Ng4+ {[%emt 0:00:14]} 38. Rxg4 {[%emt 0:00:02]} Qxg4 {[%emt 0:00:10]} 39. Bg3 {[%emt 0:00:01]} Rxh5+ {[%emt 0:00:08]} 40. Kg1 {[%emt 0:00:01]} Rd5 {[%emt 0:00:02]} 41. Qe7 {[%emt 0:00:08]} Rd1+ {[%emt 0:00:01]} 42. Kh2 {[%emt 0:00:03]} Qh5+ {[%emt 0:00:02]} 43. Bh4 {[%emt 0:00:01]} R8xd6 {[%emt 0:00:04]} 44. Rxc2 {[%emt 0:00:03]} Re6 {[%emt 0:00:07]} 45. Rc5 {[%emt 0:00:17]} Rh1+ {[%emt 0:00:09]} 46. Kxh1 {[%emt 0:00:07]} Qd1+ {[%emt 0:00:00]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "4.5"]
[White "Abdusattorov, Nodirbek"]
[Black "Yoo, Christopher Woojin"]
[Result "1/2-1/2"]
[ECO "B22"]
[WhiteElo "2627"]
[BlackElo "2455"]
[Annotator "TA"]
[PlyCount "94"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,94,18,12,14,0,12,0,17,18,36,10,19,0,43,34,62,54,52,15,18,23,55,46,47,36,51,19,93,97,101,0,1,0,-7,-43,-55,-87,-81,-81,-76,-89,-81,-99,-72,-185,-181,-191,-197,-214,-199,-209,-45,-98,-8,-8,-8,-8,-8,-14,-14,-20,-20,-29,-8,-8,-8,-14,-8,-14,-14,-14,-14,-21,-21,-21,-8,-21,-22,-29,0,-29,0,-32,0]} 1. e4 c5 2. Nf3 e6 3. c3 d5 4. exd5 Qxd5 5. d4 Nf6 6. Na3 Nc6 7. Be3 $1 {[%mdl 4] is more profitable than 7.Nb5 at the moment.} cxd4 {[#] B22: Sicilian: 2 c3.} 8. Nb5 $1 {[%cal Rb5c7]} Qd7 (8... Qd8 {feels hotter.} 9. Nbxd4 Nd5 10. Bg5 f6 11. Bh4 e5) 9. Nbxd4 a6 {The position is equal.} 10. Nxc6 Qxc6 {[#]} 11. Ne5 $146 ({Predecessor:} 11. Bd3 Bd6 12. Bd4 b5 13. Bxf6 gxf6 14. Nd2 f5 15. Be2 Bb7 16. Bf3 Qc7 17. c4 {0-1 (42) Al Shamsi,O (1469)-Yasmin,A (1509) Ajman 2019}) 11... Qc7 12. Qa4+ Bd7 (12... Nd7 {with more complications.} 13. Nf3 Be7 14. Bf4 Qc5 15. Rd1 b5) 13. Nxd7 Qxd7 14. Qxd7+ Nxd7 15. Be2 Bc5 16. Bf4 Ke7 17. O-O-O b5 18. Bf3 Ra7 19. b4 Bxf2 (19... Bb6 $1 $11 {keeps the balance.}) 20. Bd6+ $1 $16 Kd8 21. Bc6 ({White should play} 21. Bb8 $16 Ke7 22. Bxa7 Bxa7 23. Rhe1) 21... Kc8 $1 $11 22. a4 Nb6 23. axb5 Nc4 $1 {Threatens to win with ...axb5.} 24. Bf4 axb5 25. Bxb5 {[#]} Be3+ $1 {[%mdl 64] Double Attack} 26. Kc2 Na3+ {[%mdl 64] Double Attack} 27. Kb3 Bxf4 28. Bc6 (28. Be2 $17) 28... Rd8 $19 29. Rxd8+ Kxd8 30. g3 Be5 31. Rd1+ Kc7 $2 ({Better is} 31... Ke7 $19 {Hoping for ...h6.} 32. c4 {[#]} Rc7 $1) 32. Rd7+ (32. Ba4 $15) 32... Kb6 (32... Kxc6 $17 33. Rxa7 Nb1) 33. Rxa7 $11 Kxa7 34. Kxa3 Bxc3 {[%mdl 4096] Endgame KB-KB} 35. Be8 f6 36. Bf7 e5 37. Bg8 h6 38. Kb3 Bd4 39. Bh7 Kb6 40. Be4 Kc7 41. Kc4 Kd6 42. g4 Bg1 43. h3 Bf2 44. Kb5 Be1 45. Kc4 Bf2 46. Kb5 Be1 47. Kc4 Bf2 {Weighted Error Value: White=0.15/Black=0.21} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "4.6"]
[White "Murzin, Volodar"]
[Black "Liang, Awonder"]
[Result "1-0"]
[ECO "B10"]
[WhiteElo "2478"]
[BlackElo "2592"]
[Annotator "ChessBase"]
[PlyCount "169"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 3. exd5 {[%emt 0:00:01]} cxd5 {[%emt 0:00:00]} 4. Ne5 {[%emt 0:00:01]} Nf6 {[%emt 0:00:03]} 5. d4 {[%emt 0:00:08]} Nc6 {[%emt 0:00:12]} 6. Bb5 {[%emt 0:00:18]} Bd7 {[%emt 0:00:01]} 7. Nxd7 {[%emt 0:00:06]} Qxd7 {[%emt 0:00:06]} 8. c3 {[%emt 0:00:01]} e6 {[%emt 0:00:13]} 9. O-O {[%emt 0:00:07]} Bd6 {[%emt 0:00:02]} 10. Nd2 {[%emt 0:00:03]} O-O {[%emt 0:00:05]} 11. Nf3 {[%emt 0:02:05]} Qc7 {[%emt 0:00:05]} 12. g3 {[%emt 0:00:24]} Ne4 {[%emt 0:00:16]} 13. Bd3 {[%emt 0:00:21]} Rae8 {[%emt 0:00:10]} 14. Ng5 {[%emt 0:00:33]} f5 {[%emt 0:00:04]} 15. Kg2 {[%emt 0:01:06]} h6 {[%emt 0:02:12]} 16. Nh3 {[%emt 0:00:14]} g5 {[%emt 0:00:02]} 17. f3 {[%emt 0:00:05]} Nf6 {[%emt 0:00:01]} 18. Bd2 {[%emt 0:01:37]} Qg7 {[%emt 0:00:05]} 19. Kh1 {[%emt 0:00:43]} Kh8 {[%emt 0:00:04]} 20. Qe2 {[%emt 0:00:17]} Rg8 {[%emt 0:02:35]} 21. Rae1 {[%emt 0:00:16]} Qf7 {[%emt 0:00:03]} 22. Qg2 {[%emt 0:00:21]} g4 {[%emt 0:00:25]} 23. fxg4 {[%emt 0:00:26]} Rxg4 {[%emt 0:00:01]} 24. Nf4 {[%emt 0:00:13]} Ne4 {[%emt 0:00:10]} 25. Bxe4 {[%emt 0:00:44]} dxe4 {[%emt 0:00:04]} 26. Qh3 {[%emt 0:00:01]} Bxf4 {[%emt 0:01:07]} 27. Rxf4 {[%emt 0:00:10]} h5 {[%emt 0:00:45]} 28. Rxg4 {[%emt 0:01:10]} fxg4 {[%emt 0:00:03]} 29. Qg2 {[%emt 0:00:02]} e5 {[%emt 0:00:16]} 30. Qxe4 {[%emt 0:00:12]} Rd8 {[%emt 0:00:42]} 31. Bg5 {[%emt 0:00:05]} Rg8 {[%emt 0:00:07]} 32. Be3 {[%emt 0:00:27]} exd4 {[%emt 0:01:35]} 33. Bxd4+ {[%emt 0:00:07]} Nxd4 {[%emt 0:00:01]} 34. Qxd4+ {[%emt 0:00:00]} Rg7 {[%emt 0:00:05]} 35. Kg1 {[%emt 0:00:12]} b6 {[%emt 0:00:12]} 36. a4 {[%emt 0:00:15]} Kh7 {[%emt 0:00:05]} 37. Re5 {[%emt 0:00:01]} Qg6 {[%emt 0:00:13]} 38. Qd2 {[%emt 0:00:11]} Qb1+ {[%emt 0:00:03]} 39. Re1 {[%emt 0:00:02]} Qf5 {[%emt 0:00:02]} 40. Qf2 {[%emt 0:00:03]} Qg6 {[%emt 0:00:06]} 41. Qd4 {[%emt 0:00:01]} Rf7 {[%emt 0:00:03]} 42. Qe4 {[%emt 0:00:01]} Kg7 {[%emt 0:00:07]} 43. Qxg6+ {[%emt 0:00:09]} Kxg6 {[%emt 0:00:00]} 44. Re4 {[%emt 0:00:05]} Rd7 {[%emt 0:00:06]} 45. Kf2 {[%emt 0:00:01]} Rd1 {[%emt 0:00:04]} 46. Re1 {[%emt 0:00:08]} Rd2+ {[%emt 0:00:02]} 47. Re2 {[%emt 0:00:00]} Rd1 {[%emt 0:00:01]} 48. Ke3 {[%emt 0:00:16]} Kf5 {[%emt 0:00:11]} 49. Rd2 {[%emt 0:00:09]} Ra1 {[%emt 0:00:22]} 50. b3 {[%emt 0:00:02]} Ra3 {[%emt 0:00:05]} 51. Rb2 {[%emt 0:00:03]} Ke5 {[%emt 0:00:01]} 52. Kd3 {[%emt 0:00:02]} Kd5 {[%emt 0:00:06]} 53. c4+ {[%emt 0:00:09]} Kc5 {[%emt 0:00:05]} 54. Kc3 {[%emt 0:00:01]} Ra1 {[%emt 0:00:16]} 55. Rd2 {[%emt 0:00:02]} Kc6 {[%emt 0:00:18]} 56. Rd5 {[%emt 0:00:03]} h4 {[%emt 0:00:02]} 57. gxh4 {[%emt 0:00:07]} Rc1+ {[%emt 0:00:16]} 58. Kb4 {[%emt 0:00:11]} Rc2 {[%emt 0:00:04]} 59. Rg5 {[%emt 0:00:02]} a5+ {[%emt 0:00:04]} 60. Ka3 {[%emt 0:00:03]} Rg2 {[%emt 0:00:02]} 61. b4 {[%emt 0:00:12]} Rxh2 {[%emt 0:00:20]} 62. Rg6+ {[%emt 0:00:08]} Kc7 {[%emt 0:00:03]} 63. bxa5 {[%emt 0:00:01]} bxa5 {[%emt 0:00:06]} 64. Rxg4 {[%emt 0:00:02]} Rh3+ {[%emt 0:00:00]} 65. Kb2 {[%emt 0:00:02]} Kc6 {[%emt 0:00:01]} 66. Kc2 {[%emt 0:00:06]} Kc5 {[%emt 0:00:01]} 67. Kd2 {[%emt 0:00:01]} Kb4 {[%emt 0:00:03]} 68. c5+ {[%emt 0:00:07]} Kxc5 {[%emt 0:00:01]} 69. Ke2 {[%emt 0:00:02]} Rb3 {[%emt 0:00:25]} 70. Kf2 {[%emt 0:00:02]} Kd6 {[%emt 0:00:02]} 71. h5 {[%emt 0:00:11]} Rh3 {[%emt 0:00:11]} 72. Rg5 {[%emt 0:00:02]} Rh4 {[%emt 0:00:05]} 73. Rxa5 {[%emt 0:00:02]} Ke6 {[%emt 0:00:01]} 74. Kg3 {[%emt 0:00:01]} Rb4 {[%emt 0:00:01]} 75. h6 {[%emt 0:00:13]} Kf7 {[%emt 0:00:04]} 76. Rh5 {[%emt 0:00:11]} Kg8 {[%emt 0:00:04]} 77. a5 {[%emt 0:00:03]} Kh7 {[%emt 0:00:05]} 78. Kf3 {[%emt 0:00:01]} Ra4 {[%emt 0:00:09]} 79. Ke3 {[%emt 0:00:01]} Rb4 {[%emt 0:00:05]} 80. Kd3 {[%emt 0:00:01]} Ra4 {[%emt 0:00:09]} 81. Kc3 {[%emt 0:00:02]} Rg4 {[%emt 0:00:01]} 82. Kb3 {[%emt 0:00:02]} Rg1 {[%emt 0:00:07]} 83. Kb4 {[%emt 0:00:04]} Rb1+ {[%emt 0:00:01]} 84. Kc5 {[%emt 0:00:01]} Rc1+ {[%emt 0:00:03]} 85. Kb6 {[%emt 0:00:02]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "4.7"]
[White "Mammadzada, Gunay"]
[Black "Saduakassova, Dinara"]
[Result "1/2-1/2"]
[ECO "C83"]
[WhiteElo "2443"]
[BlackElo "2500"]
[Annotator "ChessBase"]
[PlyCount "76"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 4. Ba4 {[%emt 0:00:02]} Nf6 {[%emt 0:00:00]} 5. O-O {[%emt 0:00:02]} Nxe4 {[%emt 0:00:00]} 6. d4 {[%emt 0:00:02]} b5 {[%emt 0:00:01]} 7. Bb3 {[%emt 0:00:01]} d5 {[%emt 0:00:01]} 8. dxe5 {[%emt 0:00:01]} Be6 {[%emt 0:00:01]} 9. c3 {[%emt 0:00:05]} Be7 {[%emt 0:00:06]} 10. Nbd2 {[%emt 0:00:04]} Nc5 {[%emt 0:00:01]} 11. Bc2 {[%emt 0:00:15]} d4 {[%emt 0:00:02]} 12. Nb3 {[%emt 0:00:02]} d3 {[%emt 0:00:01]} 13. Bb1 {[%emt 0:00:01]} Nxb3 {[%emt 0:00:02]} 14. axb3 {[%emt 0:00:00]} Bf5 {[%emt 0:00:01]} 15. h3 {[%emt 0:00:02]} O-O {[%emt 0:00:02]} 16. b4 {[%emt 0:00:08]} Qd7 {[%emt 0:00:05]} 17. Re1 {[%emt 0:00:02]} Rfd8 {[%emt 0:00:10]} 18. Bf4 {[%emt 0:00:34]} a5 {[%emt 0:00:31]} 19. bxa5 {[%emt 0:01:23]} Rxa5 {[%emt 0:00:03]} 20. Rxa5 {[%emt 0:00:26]} Nxa5 {[%emt 0:00:01]} 21. e6 {[%emt 0:02:30]} fxe6 {[%emt 0:00:52]} 22. g4 {[%emt 0:00:25]} Bg6 {[%emt 0:00:35]} 23. Ne5 {[%emt 0:00:02]} Qd5 {[%emt 0:00:33]} 24. Nxg6 {[%emt 0:00:23]} hxg6 {[%emt 0:00:01]} 25. Bxc7 {[%emt 0:00:02]} d2 {[%emt 0:00:05]} 26. Rf1 {[%emt 0:01:04]} Nc4 {[%emt 0:00:05]} 27. Bxd8 {[%emt 0:00:32]} Nxb2 {[%emt 0:00:03]} 28. Qc2 {[%emt 0:00:08]} Qxd8 {[%emt 0:00:18]} 29. Qxg6 {[%emt 0:02:51]} d1=Q {[%emt 0:00:03]} 30. Qxe6+ {[%emt 0:00:02]} Kf8 {[%emt 0:01:13]} 31. Qf5+ {[%emt 0:00:02]} Bf6 {[%emt 0:00:23]} 32. Rxd1 {[%emt 0:00:06]} Qxd1+ {[%emt 0:00:05]} 33. Kg2 {[%emt 0:00:00]} Qd2 {[%emt 0:00:59]} 34. Qc5+ {[%emt 0:00:31]} Be7 {[%emt 0:00:36]} 35. Qc8+ {[%emt 0:00:20]} Bd8 {[%emt 0:00:08]} 36. Qf5+ {[%emt 0:00:04]} Bf6 {[%emt 0:00:03]} 37. Qc8+ {[%emt 0:00:41]} Bd8 {[%emt 0:00:05]} 38. Qf5+ {[%emt 0:00:06]} Bf6 {[%emt 0:00:01]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "4.8"]
[White "Nihal Sarin"]
[Black "Salimova, Nurgyul"]
[Result "1-0"]
[ECO "E05"]
[WhiteElo "2620"]
[BlackElo "2397"]
[Annotator "TA"]
[PlyCount "91"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 21,91,6,9,10,14,4,14,-13,0,7,5,0,15,8,42,32,41,20,35,39,68,65,72,64,64,51,66,42,50,50,49,52,75,64,56,47,68,68,69,69,72,28,28,10,33,0,0,0,0,0,0,0,0,-57,0,0,600,590,579,570,528,472,464,432,631,589,629,621,629,558,29986,1929]} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Be7 5. Bg2 O-O 6. O-O dxc4 7. Qc2 a6 8. a4 Bd7 9. Qxc4 Bc6 10. Bg5 Nbd7 11. Nc3 h6 12. Bxf6 {E05: Open Catalan: 5 Nf3 Be7.} Nxf6 13. Rfd1 $1 {[%mdl 4] is now more promising than 13.b4.} Qd6 {[#]} 14. Ne1 $146 {The position is equal.} ({Predecessor:} 14. Qd3 Rfd8 15. e4 Qb4 16. Qc2 Rac8 17. Rd2 Qb6 18. Rad1 Bb4 19. Ne5 Be8 20. Nc4 {0-1 (60) Le,Q (2713)-Aronian,L (2775) Moscow 2019}) 14... Bxg2 15. Kxg2 Rad8 16. Nf3 c6 17. a5 Qb8 18. e4 Qa7 19. h4 Rd7 20. Rd2 Bd8 21. Ne5 Re7 22. b4 Bc7 23. Nf3 Rd7 24. e5 Nd5 25. Ne4 Re7 26. Nc5 f6 27. exf6 Rxf6 28. Ne5 Bxe5 29. dxe5 Rf5 30. Re1 Qb8 31. Qe4 {With the idea Nxe6!} Qf8 32. f3 g5 33. h5 Qf7 34. Rd3 Re8 (34... Qxh5 $2 35. g4 $18) 35. Rh1 Rf8 36. Rf1 Kh8 (36... Qxh5 $2 37. Nxe6 Qe8 38. Nxf8 $18) 37. Rf2 (37. Rh1 $11) 37... Rg8 ({Wrong is} 37... Qxh5 $2 38. Nxe6 (38. g4 Qh4 $11) 38... Qe8 39. Nxf8 $18) ({Black should try} 37... g4 $1 $15) 38. Rfd2 $11 Nf4+ $2 {[%mdl 8192]} 39. gxf4 $18 gxf4+ 40. Kf1 Qxh5 {[#] ( -> ...Qh1+)} 41. Rd7 Qh1+ 42. Ke2 Rg2+ 43. Kd3 {Strongly threatening Rxg2.} Qb1+ 44. Kc3 ({But not} 44. Kc4 $2 Qc1+ 45. Qc2 Qxc2+ $19) 44... Qa1+ 45. Kb3 Rg8 46. Nxe6 {Weighted Error Value: White=0.12/Black=0.56} (46. Re7 $142 Qxe5 47. Rdd7 Rg3 48. Re8+ Rg8 49. Rxe6 {[%mdl 64] Double Attack} Rg7 50. Rxe5 Rxd7 51. Re8+ Kg7 52. Qxf5 Rd3+ 53. Nxd3 b5 54. Nxf4 h5 55. Qg6#) 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "4.9"]
[White "Badelka, Olga"]
[Black "Praggnanandhaa R"]
[Result "0-1"]
[ECO "E67"]
[WhiteElo "2433"]
[BlackElo "2608"]
[Annotator "TA"]
[PlyCount "92"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,92,38,32,37,37,67,62,64,62,86,72,82,45,79,50,55,49,91,59,107,26,30,-23,-33,-37,-49,-229,-220,-315,-335,-335,-317,-394,-397,-395,-380,-581,-519,-441,-378,-367,-343,-354,-336,-722,-722,-702,-675,-580,-414,-404,-397,-518,-238,-491,-353,-672,-689,-579,-530,-527,-461,-672,-541,-6261,-1019,-5748,-6278,-2995,-2627,-29996,-29997,-29997,-15]} 1. d4 Nf6 2. Nf3 g6 3. c4 Bg7 4. g3 d6 5. Bg2 O-O 6. Nc3 Nbd7 7. O-O e5 8. e4 Re8 9. Qc2 exd4 10. Nxd4 Nc5 {10...c6 is the modern continuation.} 11. Rd1 Ng4 $5 {[%mdl 4] A promising side line. E67: King's Indian: Fianchetto: 6...Nbd7.} 12. b3 {[#]} Ne6 $146 ({Predecessor:} 12... Ne5 13. Ba3 Bd7 14. h3 h5 15. f4 Nc6 16. Nxc6 bxc6 17. Bxc5 dxc5 18. e5 Qe7 19. Qf2 {1-0 (35) Saduakassova,D (2460)-Lagno,K (2547) Riadh 2017}) 13. Nxe6 Bxe6 {White is slightly better.} 14. Bb2 Nf6 15. Rac1 Nd7 16. Ba3 Qc8 17. Nd5 a5 18. f4 f5 19. Re1 fxe4 20. Bxe4 (20. Qxe4 $6 a4 $11) ({White should try} 20. Rxe4 $16 a4 21. Rce1 (21. bxa4 Bxd5 22. cxd5 Rxe4 $16) 21... axb3 22. Qxb3 (22. axb3 Rxa3 23. Rxe6 Rxe6 $11)) 20... c6 $11 21. Nc3 (21. Ne3 $142) 21... Nc5 {And now ...Bd4+ would win.} 22. Bf3 Bf5 $36 {[%mdl 2048] Black is more active.} 23. Qd2 {Loses the game.} (23. Ne4 $1 $15) 23... Nd3 $19 24. Rxe8+ (24. Ne4 {might work better.} Nxc1 25. Qxc1) 24... Qxe8 25. g4 {[#]} Bd4+ $1 (25... Nxc1 26. gxf5 Nd3 27. Qxd3 $17) 26. Kg2 {[#]} Be3 $1 {[%mdl 64] Double Attack, Skewer} 27. Qd1 Nxf4+ ({Not} 27... Nxc1 28. gxf5 Bxf4 29. Bxc1 $11) (27... Bxc1 $2 28. Bxc1 Qe1 29. Qxe1 $19) 28. Kg3 (28. Kh1 $142 Nh3 29. Kg2 Nf4+ 30. Kh1) 28... Bd3 29. Bxd6 g5 30. Bxf4 gxf4+ 31. Kg2 Rd8 32. Ra1 $2 (32. Nd5 Qe5 33. Nxe3 fxe3 34. Bd5+ cxd5 35. Qxd3) 32... Bg6 33. Qf1 Rd2+ 34. Ne2 Qd7 35. Kh1 Bd3 36. Re1 Qg7 (36... Bc5 $142 {aiming for ...Qe7.} 37. Qg2 Qe7) 37. Qh3 $2 (37. Rd1 {was the only defense.}) 37... Qg5 {Strongly threatening ...Bf2.} 38. Qg2 $2 (38. Nc3 Rc2 39. Nd1) 38... Qh4 39. Rf1 h6 40. a4 Kg7 41. c5 (41. Ra1 $142) 41... Qg5 42. Qh3 Bxc5 (42... Bxe2 $142 43. Bxe2 Rxe2) 43. Nc3 Bxf1 44. Qxf1 Rf2 45. Qd3 {[#]} Rxh2+ $3 {[%mdl 512]} 46. Kxh2 Qh4+ {[%mdl 32768] Weighted Error Value: White=1.06/Black=0.42. Loss on time!?} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "4.10"]
[White "Lei, Tingjie"]
[Black "Yip, Carissa"]
[Result "1-0"]
[ECO "E90"]
[WhiteElo "2505"]
[BlackElo "2430"]
[Annotator "ChessBase"]
[PlyCount "53"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:00]} Bg7 {[%emt 0:00:00]} 4. e4 {[%emt 0:00:01]} O-O {[%emt 0:00:00]} 5. Nf3 {[%emt 0:00:01]} d6 {[%emt 0:00:01]} 6. h3 {[%emt 0:00:01]} e5 {[%emt 0:00:10]} 7. d5 {[%emt 0:00:03]} a5 {[%emt 0:00:03]} 8. Be3 {[%emt 0:00:01]} Na6 {[%emt 0:00:02]} 9. g4 {[%emt 0:00:03]} Nd7 {[%emt 0:00:10]} 10. a3 {[%emt 0:00:03]} Nac5 {[%emt 0:00:09]} 11. Rg1 {[%emt 0:00:03]} a4 {[%emt 0:00:08]} 12. Nd2 {[%emt 0:00:02]} c6 {[%emt 0:00:10]} 13. Qc2 {[%emt 0:00:03]} Nb6 {[%emt 0:00:34]} 14. Be2 {[%emt 0:00:31]} Bd7 {[%emt 0:00:07]} 15. O-O-O {[%emt 0:00:43]} cxd5 {[%emt 0:00:12]} 16. exd5 {[%emt 0:00:56]} Rc8 {[%emt 0:00:25]} 17. h4 {[%emt 0:01:24]} Qxh4 {[%emt 0:02:47]} 18. Rh1 {[%emt 0:00:02]} Qe7 {[%emt 0:00:03]} 19. Rh2 {[%emt 0:00:03]} f5 {[%emt 0:01:05]} 20. Rdh1 {[%emt 0:00:07]} fxg4 {[%emt 0:00:24]} 21. Rxh7 {[%emt 0:00:26]} Bf5 {[%emt 0:00:03]} 22. Qd1 {[%emt 0:00:18]} g5 {[%emt 0:03:28]} 23. R7h5 {[%emt 0:01:00]} Nbd7 {[%emt 0:00:03]} 24. Rxg5 {[%emt 0:00:54]} Rf6 {[%emt 0:00:21]} 25. Qg1 {[%emt 0:01:10]} Rcf8 {[%emt 0:00:20]} 26. Qh2 {[%emt 0:01:32]} Kf7 {[%emt 0:01:25]} 27. Bxg4 {[%emt 0:00:23]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "5.1"]
[White "Yip, Carissa"]
[Black "Zhu, Jiner"]
[Result "0-1"]
[ECO "C56"]
[WhiteElo "2430"]
[BlackElo "2459"]
[Annotator "ChessBase"]
[PlyCount "38"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} exd4 {[%emt 0:00:00]} 4. Bc4 {[%emt 0:00:01]} Nf6 {[%emt 0:00:18]} 5. e5 {[%emt 0:00:03]} Ne4 {[%emt 0:00:03]} 6. Qe2 {[%emt 0:00:25]} Nc5 {[%emt 0:00:04]} 7. O-O {[%emt 0:00:03]} Ne6 {[%emt 0:00:24]} 8. Rd1 {[%emt 0:00:14]} d5 {[%emt 0:00:08]} 9. exd6 {[%emt 0:00:19]} Bxd6 {[%emt 0:00:02]} 10. c3 {[%emt 0:00:41]} O-O {[%emt 0:00:12]} 11. cxd4 {[%emt 0:00:01]} Qf6 {[%emt 0:00:58]} 12. Bxe6 {[%emt 0:01:21]} fxe6 {[%emt 0:00:47]} 13. Nc3 {[%emt 0:00:03]} e5 {[%emt 0:01:27]} 14. Ne4 {[%emt 0:00:13]} Qg6 {[%emt 0:00:51]} 15. Nxd6 {[%emt 0:00:41]} cxd6 {[%emt 0:00:06]} 16. dxe5 {[%emt 0:00:25]} Bg4 {[%emt 0:00:58]} 17. Qc4+ {[%emt 0:00:36]} d5 {[%emt 0:00:43]} 18. Rxd5 {[%emt 0:01:21]} Be6 {[%emt 0:00:05]} 19. Ng5 {[%emt 0:02:34]} Rad8 {[%emt 0:00:15]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "5.2"]
[White "Praggnanandhaa R"]
[Black "Lei, Tingjie"]
[Result "1-0"]
[ECO "D27"]
[WhiteElo "2608"]
[BlackElo "2505"]
[Annotator "TA"]
[PlyCount "101"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,101,28,14,18,0,50,51,77,69,117,111,156,156,241,240,233,228,232,157,211,121,127,122,112,108,103,68,152,148,158,148,420,418,352,147,757,334,476,467,445,-118,-118,-150,-120,-442,-226,-225,-193,-177,20,18,211,189,483,307,809,808,775,775,709,321,321,321,321,98,462,475,471,460,469,450,430,450,431,450,409,379,515,498,578,526,568,541,615,557,629,582,774,733,841,812]} 1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. Nf3 c5 6. O-O a6 7. Nbd2 Nbd7 {D27: Queen's Gambit Accepted: Classical main line: 7 e4!? and 7 a4.} 8. e4 {[#]} cxd4 $146 (8... b5 $5 {[%cal Rb5c4]} 9. e5 bxc4 10. exf6 gxf6 $11) ({Predecessor:} 8... b5 9. e5 bxc4 10. exf6 Nxf6 11. Nxc4 Be7 12. dxc5 Qxd1 13. Rxd1 Bxc5 14. Be3 Be7 15. Nb6 {½-½ (35) Petrov,N (2577)-Inarkiev,E (2661) Sochi 2020}) 9. e5 Ng4 {White is slightly better.} 10. Re1 Qc7 {[%cal Rd7e5]} 11. Qe2 Bc5 {aiming for ...d3!} 12. Bd3 $1 f5 (12... b6 $16 13. Qe4 {[%mdl 64] Double Attack} Ngxe5) 13. exf6 $18 Ndxf6 14. h3 Nh6 15. Nb3 Nf7 (15... Bb4 $16 {was called for.}) 16. Nbxd4 (16. Nfxd4 $6 Bxd4 17. Nxd4 O-O) ({Better is} 16. Bd2 $18) 16... Bxd4 $16 17. Nxd4 O-O 18. Bc4 (18. Nxe6 $2 Bxe6 19. Bxh7+ (19. Qxe6 $2 Rae8 $19) 19... Kxh7 $17) 18... Kh8 19. Be3 Nd5 (19... e5 $14) 20. Rac1 $36 {[%mdl 2048] Bxd5 is the strong threat. White is really pushing.} Qd6 21. Bd2 Re8 $2 {[%mdl 8192] [#]} (21... e5 $16) 22. Nf5 $1 $18 {[%mdl 512]} Qd8 {[#]} (22... Qd7 23. Nxg7) 23. Qd3 Bd7 $2 {[%mdl 8192] [#]} (23... Nf6 $16) 24. Qg3 Rg8 (24... Qf6 $142) 25. Bxd5 exd5 26. Nxg7 {[#]} d4 $1 $17 (26... Rxg7 $2 27. Bc3 $18) 27. Qd3 {Black must now prevent Nf5.} Rxg7 28. Bf4 $2 {[%mdl 8192]} (28. Qxd4 $17 Kg8 29. g4) 28... Qf6 (28... Bc6 $142 29. g3 Qd5 30. Rxc6 bxc6) 29. Bg3 $19 Bf5 30. Qf3 {Black should prevent Rc5.} Rag8 $2 (30... Ng5 $19 31. Qf4 d3) 31. Rc5 $1 $11 {[%cal Rc5f5]} Nh6 {[#] Black is now going downhill.} (31... Rg5 $1 $11) 32. Be5 $1 $18 {[%cal Re5f6]} Qf8 ({Don't blunder} 32... Rxg2+ $2 33. Qxg2 Qxe5 34. Rexe5 $18) (32... Qe7 33. Rc4 Bc8 34. Rxd4 Qg5) 33. Bxd4 Bd7 $2 (33... Qd6 34. Bxg7+ Kxg7) 34. Qxf8 Rxf8 35. Rg5 {[%mdl 64] Pin} Nf5 36. Bxg7+ (36. Rxg7 $142 Nxg7 37. Re7 {[%mdl 64] Double Attack}) 36... Nxg7 37. Re7 {[%csl LRd7,LRg7][%mdl 64] Double Attack} Ne6 38. Rh5 ({Inferior is} 38. Rxd7 Nxg5 39. Rxb7 Rg8 $11) (38. Re5 $18 {has better winning chances.} Rd8 39. R7xe6 Bxe6 40. Rxe6) 38... Bc8 {[%mdl 8192]} (38... Ng7 $16 {is a better chance.}) 39. Rexh7+ Kg8 40. Rh8+ Kg7 41. Rxf8 Nxf8 42. Rc5 Be6 43. b3 Kf6 44. f3 Nd7 45. Rc7 {White is clearly winning.} b6 46. Kf2 Nc5 47. Rc6 Nd7 48. g4 Ke5 49. Kg3 Bd5 50. f4+ Ke4 51. Rd6 {Weighted Error Value: White=0.57/Black=0.85} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "5.3"]
[White "Salimova, Nurgyul"]
[Black "Badelka, Olga"]
[Result "1/2-1/2"]
[ECO "E04"]
[WhiteElo "2397"]
[BlackElo "2433"]
[Annotator "NA"]
[PlyCount "99"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:02]} e6 {[%emt 0:00:02]} 3. g3 {[%emt 0:00:08]} d5 {[%emt 0:00:12]} 4. c4 {[%emt 0:00:06]} dxc4 {[%emt 0:00:07]} 5. Bg2 {[%emt 0:00:04]} c6 {[%emt 0:00:33]} 6. O-O {[%emt 0:00:19]} b5 {[%emt 0:00:09]} 7. Ne5 {[%emt 0:00:58]} Bb7 {[%emt 0:00:07]} 8. a4 {[%emt 0:00:55]} a6 {[%emt 0:00:05]} 9. b3 {[%emt 0:00:44]} cxb3 {[%emt 0:00:06]} 10. Qxb3 {[%emt 0:00:54]} Be7 {[%emt 0:00:22]} 11. Bb2 {[%emt 0:00:14]} O-O {[%emt 0:00:18]} 12. Rc1 {[%emt 0:00:15]} Nd5 {[%emt 0:00:14]} 13. Nd2 {[%emt 0:01:38]} f6 {[%emt 0:02:42]} 14. Nd3 {[%emt 0:00:08]} Nd7 {[%emt 0:00:06]} 15. e4 {[%emt 0:00:16]} Nc7 {[%emt 0:00:02]} 16. Nf4 {[%emt 0:00:44]} Kh8 {[%emt 0:00:21]} 17. Nxe6 {[%emt 0:00:11]} Nxe6 {[%emt 0:00:02]} 18. Qxe6 {[%emt 0:00:01]} c5 {[%emt 0:00:27]} 19. d5 {[%emt 0:00:34]} Ne5 {[%emt 0:00:28]} 20. Bxe5 {[%emt 0:00:41]} fxe5 {[%emt 0:00:07]} 21. axb5 {[%emt 0:00:17]} Bc8 {[%emt 0:02:00]} 22. Qc6 {[%emt 0:00:04]} Bd7 {[%emt 0:00:18]} 23. Qb7 {[%emt 0:00:06]} Bxb5 {[%emt 0:00:02]} 24. Bf1 {[%emt 0:01:23]} Bg5 {[%emt 0:01:28]} 25. Rc2 {[%emt 0:00:25]} Qf6 {[%emt 0:00:33]} 26. Nc4 {[%emt 0:00:27]} Rab8 {[%emt 0:00:31]} 27. Qc7 {[%emt 0:00:08]} Rfc8 {[%emt 0:00:18]} 28. Qd6 {[%emt 0:00:25]} h5 {[%emt 0:00:32]} 29. Qxf6 {[%emt 0:00:03]} Bxf6 {[%emt 0:00:02]} 30. Nd6 {[%emt 0:00:08]} Rc7 {[%emt 0:00:01]} 31. Rac1 {[%emt 0:00:05]} Be7 {[%emt 0:00:05]} 32. Nf5 {[%emt 0:00:03]} Bf8 {[%emt 0:00:02]} 33. d6 {[%emt 0:00:02]} Rd7 {[%emt 0:00:03]} 34. Rxc5 {[%emt 0:00:05]} g6 {[%emt 0:00:01]} 35. Rc8 {[%emt 0:00:11]} Rxc8 {[%emt 0:00:16]} 36. Rxc8 {[%emt 0:00:02]} Kg8 {[%emt 0:00:05]} 37. Ne7+ {[%emt 0:00:07]} Kf7 {[%emt 0:00:02]} 38. Nd5 {[%emt 0:00:04]} Bxd6 {[%emt 0:00:03]} 39. Bh3 {[%emt 0:00:06]} Rb7 {[%emt 0:00:06]} 40. Rd8 {[%emt 0:00:06]} Bc5 {[%emt 0:00:03]} 41. Rh8 {[%emt 0:00:05]} Kg7 {[%emt 0:00:04]} 42. Rc8 {[%emt 0:00:00]} Bd4 {[%emt 0:00:03]} 43. Be6 {[%emt 0:00:09]} Bd3 {[%emt 0:00:19]} 44. h4 {[%emt 0:00:07]} Rb1+ {[%emt 0:00:08]} 45. Kh2 {[%emt 0:00:02]} Bxf2 {[%emt 0:00:03]} 46. Rg8+ {[%emt 0:00:05]} Kh6 {[%emt 0:00:03]} 47. Rh8+ {[%emt 0:00:07]} Kg7 {[%emt 0:00:03]} 48. Rg8+ {[%emt 0:00:01]} Kh6 {[%emt 0:00:01]} 49. Rh8+ {[%emt 0:00:07]} Kg7 {[%emt 0:00:01]} 50. Rg8+ {[%emt 0:00:01]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "5.4"]
[White "Saduakassova, Dinara"]
[Black "Nihal Sarin"]
[Result "1/2-1/2"]
[ECO "D10"]
[WhiteElo "2500"]
[BlackElo "2620"]
[Annotator "TA"]
[PlyCount "57"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,57,28,27,0,0,0,0,0,0,0,0,0,0,0,0,-7,0,0,2,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. d4 d5 2. c4 c6 3. cxd5 cxd5 4. Bf4 Nc6 5. e3 Nf6 6. Nc3 a6 7. Bd3 Bg4 8. Be2 {D10: Slav Defence: 3 cxd5 (without early Nf3) and 3 Nc3.} (8. Nge2 {feels hotter.} e6 9. O-O Bd6 10. Bxd6 Qxd6 11. Rc1) 8... Bxe2 {[#] The position is equal.} 9. Qxe2 $146 ({Predecessor:} 9. Ngxe2 e6 10. h3 Bd6 11. O-O O-O 12. Rc1 Rc8 13. Na4 Ne4 14. Bxd6 Qxd6 15. Nc5 Nxc5 16. Rxc5 Ne7 17. Rxc8 Rxc8 18. Qd2 h6 19. Rc1 Rc6 {½-½ (19) Ivanov,M (2500)-Bacrot,E (2500) Enghien les Bains 1997}) 9... e6 10. Nf3 Bd6 11. Bxd6 Qxd6 12. O-O O-O 13. Rfc1 Rfc8 14. h3 Nd7 15. Na4 Ne7 16. Qd2 (16. a3 {looks sharper.} Rc6 17. Qd1 Rac8 18. Ne1 Rxc1 19. Rxc1 Rxc1 20. Qxc1 b6 21. Nd3) 16... h6 17. Rxc8+ Rxc8 18. Rc1 Rxc1+ (18... Rc4 {seems wilder.} 19. Nc3 Qc7 20. Ne1 Nf6 21. Nd3 Qd8) 19. Qxc1 Qc6 20. Qxc6 Nxc6 $11 {[%mdl 4096] Endgame KNN-KNN} 21. Kf1 Kf8 22. Ke2 Ke7 23. a3 Kd6 24. Kd3 g5 25. Nc3 Nb6 26. Nd2 Nd7 27. Nf3 Nf6 28. Nd2 Nd7 29. Nf3 {An uneventful encounter.  Weighted Error Value: White=0.02/Black=0.00} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "5.5"]
[White "Liang, Awonder"]
[Black "Mammadzada, Gunay"]
[Result "1-0"]
[ECO "A07"]
[WhiteElo "2592"]
[BlackElo "2443"]
[Annotator "ChessBase"]
[PlyCount "73"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. g3 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 3. Bg2 {[%emt 0:00:00]} Bg4 {[%emt 0:00:00]} 4. O-O {[%emt 0:00:00]} Nd7 {[%emt 0:00:01]} 5. c4 {[%emt 0:00:04]} Bxf3 {[%emt 0:00:33]} 6. Bxf3 {[%emt 0:00:02]} Ne5 {[%emt 0:00:01]} 7. Bg2 {[%emt 0:00:39]} Nxc4 {[%emt 0:00:24]} 8. d3 {[%emt 0:00:04]} Nd6 {[%emt 0:00:11]} 9. e4 {[%emt 0:00:02]} e6 {[%emt 0:00:51]} 10. Nc3 {[%emt 0:00:12]} Ne7 {[%emt 0:00:37]} 11. h4 {[%emt 0:00:24]} Qd7 {[%emt 0:03:00]} 12. Be3 {[%emt 0:00:27]} dxe4 {[%emt 0:00:19]} 13. dxe4 {[%emt 0:00:05]} Nc4 {[%emt 0:00:13]} 14. Qe2 {[%emt 0:00:07]} Nxe3 {[%emt 0:00:08]} 15. Qxe3 {[%emt 0:00:00]} Nc8 {[%emt 0:00:15]} 16. Rad1 {[%emt 0:00:06]} Qc7 {[%emt 0:00:03]} 17. Qg5 {[%emt 0:00:42]} h6 {[%emt 0:00:22]} 18. Qg4 {[%emt 0:00:01]} Nb6 {[%emt 0:00:32]} 19. e5 {[%emt 0:01:06]} h5 {[%emt 0:02:30]} 20. Qg5 {[%emt 0:00:09]} Nd7 {[%emt 0:00:02]} 21. Rfe1 {[%emt 0:00:25]} g6 {[%emt 0:00:34]} 22. Qc1 {[%emt 0:02:44]} O-O-O {[%emt 0:00:20]} 23. Qf4 {[%emt 0:00:12]} Bg7 {[%emt 0:00:31]} 24. Qxf7 {[%emt 0:00:08]} Nxe5 {[%emt 0:00:01]} 25. Qxe6+ {[%emt 0:00:08]} Kb8 {[%emt 0:00:01]} 26. Ne4 {[%emt 0:00:10]} Nd3 {[%emt 0:00:06]} 27. Re3 {[%emt 0:00:15]} Nxb2 {[%emt 0:00:18]} 28. Rb1 {[%emt 0:00:32]} Rd1+ {[%emt 0:00:11]} 29. Rxd1 {[%emt 0:00:03]} Nxd1 {[%emt 0:00:00]} 30. Rb3 {[%emt 0:00:01]} Ka8 {[%emt 0:00:17]} 31. Nd6 {[%emt 0:00:14]} Rb8 {[%emt 0:00:09]} 32. Rxb7 {[%emt 0:00:11]} Rxb7 {[%emt 0:00:01]} 33. Qe8+ {[%emt 0:00:01]} Qb8 {[%emt 0:00:02]} 34. Qxc6 {[%emt 0:00:02]} a5 {[%emt 0:00:04]} 35. Nc8 {[%emt 0:00:36]} Bd4 {[%emt 0:00:06]} 36. Qa6+ {[%emt 0:00:01]} Ba7 {[%emt 0:00:01]} 37. Nb6# {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "5.6"]
[White "Yoo, Christopher Woojin"]
[Black "Murzin, Volodar"]
[Result "1-0"]
[ECO "E90"]
[WhiteElo "2455"]
[BlackElo "2478"]
[Annotator "ChessBase"]
[PlyCount "83"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. c4 {[%emt 0:00:00]} Bg7 {[%emt 0:00:00]} 4. Nc3 {[%emt 0:00:00]} O-O {[%emt 0:00:02]} 5. Bg5 {[%emt 0:00:02]} d6 {[%emt 0:00:58]} 6. Qd2 {[%emt 0:00:03]} Nbd7 {[%emt 0:01:52]} 7. e4 {[%emt 0:00:04]} e5 {[%emt 0:00:05]} 8. Bd3 {[%emt 0:00:03]} Re8 {[%emt 0:00:12]} 9. O-O {[%emt 0:00:06]} Nf8 {[%emt 0:00:50]} 10. d5 {[%emt 0:01:27]} h5 {[%emt 0:00:06]} 11. h3 {[%emt 0:00:20]} a5 {[%emt 0:00:19]} 12. a3 {[%emt 0:01:16]} a4 {[%emt 0:01:37]} 13. Bc2 {[%emt 0:01:00]} Bd7 {[%emt 0:00:04]} 14. Qd1 {[%emt 0:00:02]} N8h7 {[%emt 0:00:21]} 15. Bxf6 {[%emt 0:00:26]} Nxf6 {[%emt 0:00:23]} 16. Re1 {[%emt 0:00:05]} Bh6 {[%emt 0:01:01]} 17. Bxa4 {[%emt 0:00:31]} Bxa4 {[%emt 0:00:10]} 18. Nxa4 {[%emt 0:00:00]} Kh8 {[%emt 0:00:09]} 19. Nc3 {[%emt 0:01:21]} Rg8 {[%emt 0:00:08]} 20. Nh2 {[%emt 0:00:40]} Qd7 {[%emt 0:00:17]} 21. Qd3 {[%emt 0:00:08]} Qe7 {[%emt 0:00:51]} 22. b4 {[%emt 0:00:17]} Nd7 {[%emt 0:00:50]} 23. a4 {[%emt 0:00:22]} Nb8 {[%emt 0:00:25]} 24. a5 {[%emt 0:01:04]} Na6 {[%emt 0:00:04]} 25. Rab1 {[%emt 0:00:01]} Qd7 {[%emt 0:00:12]} 26. Nf3 {[%emt 0:00:17]} Raf8 {[%emt 0:00:10]} 27. c5 {[%emt 0:00:12]} Nb8 {[%emt 0:00:42]} 28. cxd6 {[%emt 0:00:19]} cxd6 {[%emt 0:00:03]} 29. b5 {[%emt 0:00:01]} Qe7 {[%emt 0:00:20]} 30. a6 {[%emt 0:00:27]} Nd7 {[%emt 0:00:01]} 31. axb7 {[%emt 0:00:28]} Nc5 {[%emt 0:00:02]} 32. Qc4 {[%emt 0:00:01]} f5 {[%emt 0:00:06]} 33. b6 {[%emt 0:00:17]} Rb8 {[%emt 0:00:14]} 34. Qb5 {[%emt 0:00:25]} Rxb7 {[%emt 0:00:05]} 35. Qc6 {[%emt 0:00:04]} f4 {[%emt 0:00:09]} 36. Nb5 {[%emt 0:00:16]} Rd8 {[%emt 0:00:04]} 37. Nd2 {[%emt 0:00:07]} g5 {[%emt 0:00:03]} 38. Nc4 {[%emt 0:00:06]} Bf8 {[%emt 0:00:02]} 39. Nbxd6 {[%emt 0:00:12]} Rxd6 {[%emt 0:00:09]} 40. Qxc5 {[%emt 0:00:01]} Rd8 {[%emt 0:00:09]} 41. Qxe7 {[%emt 0:00:05]} Bxe7 {[%emt 0:00:02]} 42. Nxe5 {[%emt 0:00:06]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "5.7"]
[White "Shuvalova, Polina"]
[Black "Abdusattorov, Nodirbek"]
[Result "0-1"]
[ECO "E20"]
[WhiteElo "2476"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "72"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,72,0,0,0,0,1,8,12,9,9,-36,-33,-96,-70,-70,-65,-65,-58,-97,-97,-97,-97,-98,-98,-108,-105,-110,-93,-139,-139,-128,-133,-137,-140,-138,-135,-141,-134,-137,-143,-143,-135,-151,-141,-146,-156,-190,-182,-203,-199,-193,-202,-533,-525,-624,-595,-640,-637,-653,-647,-992,-975,-1136,-1133]} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Nc3 dxc4 6. Bg2 Bd7 $5 {[%mdl 4] Leaves trodden paths. E20: Nimzo-Indian: 4 g3 and 4 f3.} 7. Ne5 Bc6 8. Nxc6 Nxc6 {The position is equal.} 9. Qa4 Nd5 {[#]} 10. Bd2 $146 ({Predecessor:} 10. a3 Ba5 11. Qxc4 O-O 12. b4 Nxc3 13. Bxc6 bxc6 14. Qxc3 Bb6 15. Be3 Qd5 16. O-O {1-0 (36) Kiselev,M (2152)-Kozlov,S (1886) Voronezh 2013}) 10... O-O 11. a3 {[#]} (11. e3 $15) 11... Nb6 $1 12. Qd1 Be7 $36 {[%mdl 2048] Black has some pressure.} 13. e3 Na5 14. Rc1 Nb3 15. Rc2 c5 16. dxc5 Nxc5 17. O-O Qd3 18. Qb1 Rad8 19. Nb5 {[#]} Nb3 $1 {[%cal Rb3d2]} 20. Bc3 Na4 21. Nd4 Nxc3 ({Don't take} 21... Nxd4 22. exd4 b5 23. Rd1 $17) 22. Rxc3 Qxb1 ({Avoid the trap} 22... Nxd4 $2 23. Rxd3 Ne2+ 24. Kh1 $18) 23. Rxb1 Nxd4 24. exd4 b5 25. a4 a6 {[%cal Ba7a6,Ba6b5][%mdl 32]} 26. axb5 axb5 27. Bc6 {[#]} Rb8 $1 ({Don't play} 27... Rxd4 28. Bxb5 Rd2 29. Bxc4 $17) 28. d5 Rb6 29. b3 Bf6 30. Rc2 c3 {aiming for ...Rd8.} 31. b4 $2 (31. Ra1) 31... Rd8 $19 {Black is clearly winning.} 32. Re1 Kf8 33. Rce2 g5 34. Kg2 Kg7 35. Rd1 exd5 36. Be8 d4 {Black took control after the opening.  Weighted Error Value: White=0.43/Black=0.03} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "5.8"]
[White "Bjerre, Jonas Buhl"]
[Black "Khademalsharieh, Sarasadat"]
[Result "1/2-1/2"]
[ECO "E15"]
[WhiteElo "2550"]
[BlackElo "2494"]
[Annotator "ChessBase"]
[PlyCount "45"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} b6 {[%emt 0:00:03]} 4. g3 {[%emt 0:00:00]} Bb4+ {[%emt 0:00:02]} 5. Bd2 {[%emt 0:00:04]} Bxd2+ {[%emt 0:00:03]} 6. Qxd2 {[%emt 0:00:02]} Ba6 {[%emt 0:00:02]} 7. b3 {[%emt 0:00:02]} d5 {[%emt 0:00:07]} 8. cxd5 {[%emt 0:00:24]} exd5 {[%emt 0:00:16]} 9. Nc3 {[%emt 0:00:34]} O-O {[%emt 0:00:09]} 10. Bg2 {[%emt 0:00:01]} Nbd7 {[%emt 0:00:08]} 11. O-O {[%emt 0:00:17]} Re8 {[%emt 0:00:08]} 12. Rfd1 {[%emt 0:00:51]} Ne4 {[%emt 0:01:00]} 13. Nxe4 {[%emt 0:00:26]} dxe4 {[%emt 0:00:01]} 14. Ne1 {[%emt 0:00:45]} Bb7 {[%emt 0:01:11]} 15. Nc2 {[%emt 0:00:25]} c5 {[%emt 0:01:40]} 16. Ne3 {[%emt 0:01:00]} Qf6 {[%emt 0:00:58]} 17. Bh3 {[%emt 0:01:48]} Rad8 {[%emt 0:00:16]} 18. dxc5 {[%emt 0:00:38]} Nxc5 {[%emt 0:00:02]} 19. Qc2 {[%emt 0:00:03]} Bc8 {[%emt 0:00:57]} 20. Bg2 {[%emt 0:00:13]} Bb7 {[%emt 0:00:19]} 21. Bh3 {[%emt 0:01:26]} Bc8 {[%emt 0:00:08]} 22. Bg2 {[%emt 0:01:17]} Bb7 {[%emt 0:00:02]} 23. Bh3 {[%emt 0:00:34]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "5.9"]
[White "Gukesh D"]
[Black "Abdumalik, Zhansaya"]
[Result "1-0"]
[ECO "A62"]
[WhiteElo "2578"]
[BlackElo "2472"]
[Annotator "ChessBase"]
[PlyCount "77"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:01]} g6 {[%emt 0:00:00]} 3. g3 {[%emt 0:00:01]} c5 {[%emt 0:00:06]} 4. d5 {[%emt 0:00:48]} Bg7 {[%emt 0:00:14]} 5. Bg2 {[%emt 0:00:06]} d6 {[%emt 0:00:01]} 6. Nc3 {[%emt 0:00:21]} O-O {[%emt 0:00:08]} 7. Nf3 {[%emt 0:00:09]} e6 {[%emt 0:00:19]} 8. O-O {[%emt 0:00:13]} exd5 {[%emt 0:00:01]} 9. cxd5 {[%emt 0:00:09]} a6 {[%emt 0:00:06]} 10. a4 {[%emt 0:00:02]} Bf5 {[%emt 0:00:02]} 11. Nd2 {[%emt 0:00:14]} Re8 {[%emt 0:00:35]} 12. e4 {[%emt 0:00:04]} Bg4 {[%emt 0:00:13]} 13. f3 {[%emt 0:00:26]} Bc8 {[%emt 0:00:03]} 14. Nc4 {[%emt 0:00:15]} Bf8 {[%emt 0:00:26]} 15. Bf4 {[%emt 0:00:59]} Nh5 {[%emt 0:00:08]} 16. Be3 {[%emt 0:00:04]} Nd7 {[%emt 0:00:04]} 17. a5 {[%emt 0:00:10]} b5 {[%emt 0:00:12]} 18. axb6 {[%emt 0:00:03]} Nxb6 {[%emt 0:00:01]} 19. Na5 {[%emt 0:00:13]} Nf6 {[%emt 0:00:18]} 20. Qd2 {[%emt 0:00:23]} Qc7 {[%emt 0:00:10]} 21. Rfc1 {[%emt 0:00:20]} Nfd7 {[%emt 0:00:38]} 22. f4 {[%emt 0:01:03]} Qd8 {[%emt 0:00:41]} 23. Nc6 {[%emt 0:01:11]} Qc7 {[%emt 0:00:20]} 24. b3 {[%emt 0:00:21]} Bb7 {[%emt 0:00:10]} 25. Na5 {[%emt 0:00:57]} Bc8 {[%emt 0:00:44]} 26. Ra2 {[%emt 0:00:22]} Nf6 {[%emt 0:00:25]} 27. h3 {[%emt 0:00:05]} Bg7 {[%emt 0:00:20]} 28. b4 {[%emt 0:00:31]} Nfd7 {[%emt 0:01:31]} 29. e5 {[%emt 0:00:47]} Rb8 {[%emt 0:00:47]} 30. Ne4 {[%emt 0:00:18]} dxe5 {[%emt 0:01:14]} 31. bxc5 {[%emt 0:00:09]} Nxd5 {[%emt 0:00:35]} 32. Qxd5 {[%emt 0:00:04]} Nf6 {[%emt 0:00:01]} 33. Qd6 {[%emt 0:00:12]} Qxd6 {[%emt 0:00:25]} 34. Nxd6 {[%emt 0:00:01]} Be6 {[%emt 0:00:01]} 35. Nxe8 {[%emt 0:00:07]} Bxa2 {[%emt 0:00:02]} 36. Nxg7 {[%emt 0:00:01]} Kxg7 {[%emt 0:00:03]} 37. fxe5 {[%emt 0:00:01]} Nd7 {[%emt 0:00:01]} 38. c6 {[%emt 0:00:02]} Nxe5 {[%emt 0:00:04]} 39. c7 {[%emt 0:00:02]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "5.10"]
[White "Keymer, Vincent"]
[Black "Mendonca, Leon Luke"]
[Result "1-0"]
[ECO "E14"]
[WhiteElo "2591"]
[BlackElo "2549"]
[Annotator "ChessBase"]
[PlyCount "105"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. Nf3 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:04]} e6 {[%emt 0:00:53]} 3. Nc3 {[%emt 0:00:03]} d5 {[%emt 0:00:01]} 4. e3 {[%emt 0:00:01]} Be7 {[%emt 0:00:13]} 5. b3 {[%emt 0:00:01]} O-O {[%emt 0:00:08]} 6. Bb2 {[%emt 0:00:01]} b6 {[%emt 0:00:02]} 7. cxd5 {[%emt 0:00:10]} exd5 {[%emt 0:00:03]} 8. d4 {[%emt 0:00:02]} Bb7 {[%emt 0:00:18]} 9. Bd3 {[%emt 0:00:01]} Nbd7 {[%emt 0:00:27]} 10. O-O {[%emt 0:00:02]} a6 {[%emt 0:00:02]} 11. Ne2 {[%emt 0:00:04]} Re8 {[%emt 0:00:07]} 12. Ng3 {[%emt 0:00:05]} Bd6 {[%emt 0:00:23]} 13. Nf5 {[%emt 0:00:09]} Bf8 {[%emt 0:00:05]} 14. Ne5 {[%emt 0:00:09]} g6 {[%emt 0:02:15]} 15. Ng3 {[%emt 0:00:04]} Bg7 {[%emt 0:00:49]} 16. f4 {[%emt 0:00:44]} c5 {[%emt 0:00:26]} 17. Qf3 {[%emt 0:00:16]} Qc7 {[%emt 0:00:39]} 18. Rac1 {[%emt 0:00:22]} Rac8 {[%emt 0:00:09]} 19. Qe2 {[%emt 0:01:21]} a5 {[%emt 0:01:32]} 20. Bb5 {[%emt 0:00:34]} Re7 {[%emt 0:00:06]} 21. Rfd1 {[%emt 0:00:14]} Qd8 {[%emt 0:00:45]} 22. a4 {[%emt 0:00:36]} cxd4 {[%emt 0:00:26]} 23. exd4 {[%emt 0:00:10]} Nf8 {[%emt 0:00:19]} 24. Rxc8 {[%emt 0:01:03]} Qxc8 {[%emt 0:00:03]} 25. f5 {[%emt 0:00:25]} Rc7 {[%emt 0:00:36]} 26. Bd3 {[%emt 0:00:18]} Qd8 {[%emt 0:01:07]} 27. Rf1 {[%emt 0:00:11]} Qd6 {[%emt 0:00:01]} 28. h4 {[%emt 0:00:34]} Ne4 {[%emt 0:00:15]} 29. Nxe4 {[%emt 0:00:27]} dxe4 {[%emt 0:00:02]} 30. Bxe4 {[%emt 0:00:00]} Bxe4 {[%emt 0:00:00]} 31. Qxe4 {[%emt 0:00:01]} Qb4 {[%emt 0:00:05]} 32. fxg6 {[%emt 0:00:32]} hxg6 {[%emt 0:00:03]} 33. Qd5 {[%emt 0:00:23]} Bxe5 {[%emt 0:00:06]} 34. Qxe5 {[%emt 0:00:06]} Re7 {[%emt 0:00:03]} 35. Qf6 {[%emt 0:00:16]} Nh7 {[%emt 0:00:12]} 36. Qf3 {[%emt 0:00:04]} Qd2 {[%emt 0:00:05]} 37. Rf2 {[%emt 0:00:43]} Qe1+ {[%emt 0:00:06]} 38. Kh2 {[%emt 0:00:03]} Qe3 {[%emt 0:00:04]} 39. d5 {[%emt 0:00:36]} Qxf3 {[%emt 0:00:11]} 40. Rxf3 {[%emt 0:00:00]} Rd7 {[%emt 0:00:03]} 41. Rc3 {[%emt 0:00:09]} f6 {[%emt 0:00:06]} 42. Rc6 {[%emt 0:00:19]} Rxd5 {[%emt 0:00:04]} 43. Bxf6 {[%emt 0:00:05]} b5 {[%emt 0:00:08]} 44. Bc3 {[%emt 0:00:28]} Nf8 {[%emt 0:00:01]} 45. Rc7 {[%emt 0:00:12]} Ne6 {[%emt 0:00:05]} 46. Re7 {[%emt 0:00:11]} Nd4 {[%emt 0:00:09]} 47. axb5 {[%emt 0:00:14]} Nf5 {[%emt 0:00:04]} 48. Rb7 {[%emt 0:00:21]} Rd3 {[%emt 0:00:01]} 49. Rc7 {[%emt 0:00:11]} Rd5 {[%emt 0:00:04]} 50. b6 {[%emt 0:00:06]} Nd6 {[%emt 0:00:11]} 51. Rd7 {[%emt 0:00:14]} Rc5 {[%emt 0:00:05]} 52. Rxd6 {[%emt 0:00:05]} Rxc3 {[%emt 0:00:05]} 53. Rd8+ {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "6.1"]
[White "Zhu, Jiner"]
[Black "Mendonca, Leon Luke"]
[Result "1/2-1/2"]
[ECO "B36"]
[WhiteElo "2459"]
[BlackElo "2549"]
[Annotator "ChessBase"]
[PlyCount "78"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:07]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:04]} 4. Nxd4 {[%emt 0:00:04]} g6 {[%emt 0:00:12]} 5. c4 {[%emt 0:00:04]} Nf6 {[%emt 0:00:33]} 6. Nc3 {[%emt 0:00:03]} Nxd4 {[%emt 0:00:21]} 7. Qxd4 {[%emt 0:00:04]} d6 {[%emt 0:00:02]} 8. Be3 {[%emt 0:00:10]} Bg7 {[%emt 0:00:04]} 9. f3 {[%emt 0:00:03]} O-O {[%emt 0:00:10]} 10. Qd2 {[%emt 0:00:02]} Be6 {[%emt 0:00:05]} 11. Be2 {[%emt 0:00:27]} Qa5 {[%emt 0:00:31]} 12. Rc1 {[%emt 0:00:13]} Rfc8 {[%emt 0:00:45]} 13. b3 {[%emt 0:00:57]} Nd7 {[%emt 0:00:45]} 14. Nd5 {[%emt 0:01:47]} Qxd2+ {[%emt 0:00:05]} 15. Kxd2 {[%emt 0:00:06]} Bxd5 {[%emt 0:00:22]} 16. cxd5 {[%emt 0:00:04]} a6 {[%emt 0:02:52]} 17. Rxc8+ {[%emt 0:00:05]} Rxc8 {[%emt 0:00:02]} 18. Rc1 {[%emt 0:00:01]} Rxc1 {[%emt 0:00:23]} 19. Kxc1 {[%emt 0:00:03]} Bc3 {[%emt 0:01:02]} 20. a3 {[%emt 0:02:21]} Ba5 {[%emt 0:00:55]} 21. Kc2 {[%emt 0:00:04]} Kg7 {[%emt 0:00:39]} 22. Bd4+ {[%emt 0:01:02]} Kf8 {[%emt 0:00:15]} 23. b4 {[%emt 0:00:51]} Bb6 {[%emt 0:00:14]} 24. Bc3 {[%emt 0:00:14]} Bg1 {[%emt 0:00:56]} 25. h3 {[%emt 0:00:01]} g5 {[%emt 0:00:21]} 26. a4 {[%emt 0:00:15]} f6 {[%emt 0:00:12]} 27. Kb3 {[%emt 0:00:45]} Ke8 {[%emt 0:00:03]} 28. Bd2 {[%emt 0:00:39]} Ne5 {[%emt 0:00:07]} 29. b5 {[%emt 0:00:50]} axb5 {[%emt 0:00:05]} 30. Bxb5+ {[%emt 0:00:01]} Kd8 {[%emt 0:00:06]} 31. Kc2 {[%emt 0:00:40]} Ng6 {[%emt 0:00:05]} 32. Kd1 {[%emt 0:00:12]} Nf4 {[%emt 0:00:05]} 33. Bxf4 {[%emt 0:00:03]} gxf4 {[%emt 0:00:01]} 34. Ke2 {[%emt 0:00:02]} h6 {[%emt 0:00:07]} 35. Kd3 {[%emt 0:00:01]} Bf2 {[%emt 0:00:05]} 36. Ke2 {[%emt 0:00:01]} Bg1 {[%emt 0:00:02]} 37. Kd3 {[%emt 0:00:01]} Bf2 {[%emt 0:00:01]} 38. Kc4 {[%emt 0:00:02]} Kc7 {[%emt 0:00:03]} 39. Kd3 {[%emt 0:00:01]} Kd8 {[%emt 0:00:03]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "6.2"]
[White "Abdumalik, Zhansaya"]
[Black "Keymer, Vincent"]
[Result "0-1"]
[ECO "B90"]
[WhiteElo "2472"]
[BlackElo "2591"]
[Annotator "ChessBase"]
[PlyCount "98"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:00]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 6. h3 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 7. Nde2 {[%emt 0:00:00]} h5 {[%emt 0:00:00]} 8. g3 {[%emt 0:00:01]} Be7 {[%emt 0:00:08]} 9. Bg2 {[%emt 0:00:02]} b5 {[%emt 0:00:08]} 10. Nd5 {[%emt 0:00:02]} Nbd7 {[%emt 0:00:02]} 11. O-O {[%emt 0:00:21]} Nxd5 {[%emt 0:00:26]} 12. Qxd5 {[%emt 0:00:02]} Rb8 {[%emt 0:00:01]} 13. Be3 {[%emt 0:00:12]} h4 {[%emt 0:00:49]} 14. g4 {[%emt 0:00:09]} Bb7 {[%emt 0:00:04]} 15. Qd2 {[%emt 0:00:06]} O-O {[%emt 0:00:57]} 16. Nc3 {[%emt 0:01:02]} Rc8 {[%emt 0:00:11]} 17. Rac1 {[%emt 0:01:49]} Re8 {[%emt 0:01:40]} 18. Nd5 {[%emt 0:00:47]} Bxd5 {[%emt 0:00:20]} 19. Qxd5 {[%emt 0:00:17]} Nb6 {[%emt 0:00:00]} 20. Qb7 {[%emt 0:00:35]} Nc4 {[%emt 0:00:04]} 21. Qxa6 {[%emt 0:00:01]} Qd7 {[%emt 0:00:14]} 22. a4 {[%emt 0:00:26]} bxa4 {[%emt 0:00:05]} 23. b3 {[%emt 0:01:09]} Nxe3 {[%emt 0:00:41]} 24. fxe3 {[%emt 0:00:00]} Bg5 {[%emt 0:00:03]} 25. Qd3 {[%emt 0:00:15]} Qa7 {[%emt 0:01:19]} 26. Rce1 {[%emt 0:00:04]} a3 {[%emt 0:00:01]} 27. c4 {[%emt 0:00:10]} a2 {[%emt 0:00:09]} 28. Kf2 {[%emt 0:00:25]} Rb8 {[%emt 0:00:24]} 29. Ra1 {[%emt 0:00:10]} Qa3 {[%emt 0:00:07]} 30. Qc2 {[%emt 0:00:23]} Bxe3+ {[%emt 0:01:41]} 31. Ke2 {[%emt 0:00:18]} Qxb3 {[%emt 0:00:34]} 32. Rxa2 {[%emt 0:00:34]} Bd4 {[%emt 0:00:08]} 33. Qxb3 {[%emt 0:00:19]} Rxb3 {[%emt 0:00:00]} 34. Rf3 {[%emt 0:00:00]} Rb4 {[%emt 0:00:14]} 35. Rc2 {[%emt 0:00:15]} Ra8 {[%emt 0:00:11]} 36. Kd2 {[%emt 0:00:22]} Ra1 {[%emt 0:00:31]} 37. Bf1 {[%emt 0:00:10]} Rbb1 {[%emt 0:00:11]} 38. Be2 {[%emt 0:00:03]} Bc5 {[%emt 0:00:06]} 39. Rd3 {[%emt 0:00:23]} Bb4+ {[%emt 0:00:03]} 40. Ke3 {[%emt 0:00:01]} Rh1 {[%emt 0:00:00]} 41. g5 {[%emt 0:00:43]} Rxh3+ {[%emt 0:00:28]} 42. Kf2 {[%emt 0:00:01]} Rh2+ {[%emt 0:00:04]} 43. Ke3 {[%emt 0:00:12]} Bc5+ {[%emt 0:00:08]} 44. Kd2 {[%emt 0:00:05]} Rg1 {[%emt 0:00:22]} 45. Rb3 {[%emt 0:00:06]} h3 {[%emt 0:00:12]} 46. Rb8+ {[%emt 0:00:22]} Kh7 {[%emt 0:00:02]} 47. Rb3 {[%emt 0:00:00]} Kg6 {[%emt 0:00:02]} 48. Rf3 {[%emt 0:00:06]} Rxe2+ {[%emt 0:00:09]} 49. Kxe2 {[%emt 0:00:05]} h2 {[%emt 0:00:00]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "6.3"]
[White "Khademalsharieh, Sarasadat"]
[Black "Gukesh D"]
[Result "0-1"]
[ECO "D38"]
[WhiteElo "2494"]
[BlackElo "2578"]
[Annotator "ChessBase"]
[PlyCount "138"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:00]} Bb4 {[%emt 0:00:13]} 4. cxd5 {[%emt 0:00:20]} exd5 {[%emt 0:00:04]} 5. Nf3 {[%emt 0:00:02]} Nf6 {[%emt 0:00:25]} 6. Bg5 {[%emt 0:00:31]} Nbd7 {[%emt 0:00:37]} 7. Qb3 {[%emt 0:00:48]} c5 {[%emt 0:00:59]} 8. dxc5 {[%emt 0:00:33]} Qa5 {[%emt 0:00:52]} 9. a3 {[%emt 0:01:38]} Bxc3+ {[%emt 0:00:13]} 10. bxc3 {[%emt 0:01:04]} Ne4 {[%emt 0:00:54]} 11. Qb4 {[%emt 0:00:39]} Qxc5 {[%emt 0:00:40]} 12. Be3 {[%emt 0:00:02]} Qc7 {[%emt 0:01:02]} 13. Bd4 {[%emt 0:00:01]} a5 {[%emt 0:00:21]} 14. Qb2 {[%emt 0:00:16]} O-O {[%emt 0:00:03]} 15. e3 {[%emt 0:00:06]} Ndc5 {[%emt 0:00:01]} 16. Bb5 {[%emt 0:01:38]} Bg4 {[%emt 0:01:44]} 17. Ne5 {[%emt 0:00:22]} Bh5 {[%emt 0:00:08]} 18. O-O {[%emt 0:00:05]} a4 {[%emt 0:01:01]} 19. f3 {[%emt 0:00:18]} Nf6 {[%emt 0:00:09]} 20. Nd3 {[%emt 0:00:16]} Nb3 {[%emt 0:00:45]} 21. Rae1 {[%emt 0:01:24]} Nxd4 {[%emt 0:00:44]} 22. cxd4 {[%emt 0:00:02]} Rfc8 {[%emt 0:00:22]} 23. Rc1 {[%emt 0:00:08]} Qe7 {[%emt 0:00:01]} 24. Rfe1 {[%emt 0:00:22]} Rxc1 {[%emt 0:00:07]} 25. Qxc1 {[%emt 0:00:01]} Bg6 {[%emt 0:00:09]} 26. Nc5 {[%emt 0:00:08]} Ne8 {[%emt 0:00:11]} 27. Bxe8 {[%emt 0:00:08]} Rxe8 {[%emt 0:00:10]} 28. Qb2 {[%emt 0:00:02]} Qg5 {[%emt 0:00:09]} 29. Qxb7 {[%emt 0:00:15]} h5 {[%emt 0:00:01]} 30. f4 {[%emt 0:00:05]} Qh4 {[%emt 0:00:04]} 31. g3 {[%emt 0:00:15]} Qd8 {[%emt 0:00:01]} 32. Qc6 {[%emt 0:00:25]} Re7 {[%emt 0:00:09]} 33. Qxa4 {[%emt 0:00:03]} h4 {[%emt 0:00:06]} 34. Qd1 {[%emt 0:00:04]} Qa5 {[%emt 0:00:05]} 35. a4 {[%emt 0:00:03]} Bh5 {[%emt 0:00:03]} 36. Qb1 {[%emt 0:00:06]} Qd2 {[%emt 0:00:09]} 37. Qc1 {[%emt 0:00:06]} Qa5 {[%emt 0:00:08]} 38. Rf1 {[%emt 0:00:09]} h3 {[%emt 0:00:02]} 39. Qe1 {[%emt 0:00:04]} Qa8 {[%emt 0:00:11]} 40. Qf2 {[%emt 0:00:07]} Qa5 {[%emt 0:00:03]} 41. Qe1 {[%emt 0:00:15]} Qa8 {[%emt 0:00:02]} 42. Qd2 {[%emt 0:00:01]} Qe8 {[%emt 0:00:05]} 43. Re1 {[%emt 0:00:02]} Ra7 {[%emt 0:00:10]} 44. a5 {[%emt 0:00:03]} Qb5 {[%emt 0:00:04]} 45. a6 {[%emt 0:00:01]} Bg6 {[%emt 0:00:00]} 46. Qe2 {[%emt 0:00:06]} Qa5 {[%emt 0:00:03]} 47. Rf1 {[%emt 0:00:07]} Bf5 {[%emt 0:00:06]} 48. Qf3 {[%emt 0:00:10]} Qd2 {[%emt 0:00:04]} 49. g4 {[%emt 0:00:10]} Bc8 {[%emt 0:00:13]} 50. Qf2 {[%emt 0:00:15]} Qc3 {[%emt 0:00:03]} 51. Qe1 {[%emt 0:00:06]} Qa3 {[%emt 0:00:07]} 52. Qg3 {[%emt 0:00:05]} Bxa6 {[%emt 0:00:02]} 53. Nxa6 {[%emt 0:00:01]} Qxa6 {[%emt 0:00:03]} 54. Qxh3 {[%emt 0:00:01]} Qd3 {[%emt 0:00:02]} 55. Qf3 {[%emt 0:00:12]} Ra2 {[%emt 0:00:05]} 56. Rf2 {[%emt 0:00:03]} Ra1+ {[%emt 0:00:02]} 57. Kg2 {[%emt 0:00:01]} Re1 {[%emt 0:00:04]} 58. e4 {[%emt 0:00:20]} Qxd4 {[%emt 0:00:02]} 59. exd5 {[%emt 0:00:03]} Re3 {[%emt 0:00:01]} 60. d6 {[%emt 0:00:11]} Rxf3 {[%emt 0:00:01]} 61. Rxf3 {[%emt 0:00:00]} Qxd6 {[%emt 0:00:01]} 62. h4 {[%emt 0:00:01]} Qd2+ {[%emt 0:00:03]} 63. Kg3 {[%emt 0:00:01]} Qe1+ {[%emt 0:00:00]} 64. Kh3 {[%emt 0:00:03]} Qh1+ {[%emt 0:00:02]} 65. Kg3 {[%emt 0:00:00]} Qg1+ {[%emt 0:00:00]} 66. Kh3 {[%emt 0:00:01]} Kh7 {[%emt 0:00:02]} 67. h5 {[%emt 0:00:01]} Kh6 {[%emt 0:00:03]} 68. Ra3 {[%emt 0:00:24]} Qf2 {[%emt 0:00:06]} 69. Ra6+ {[%emt 0:00:21]} f6 {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "6.4"]
[White "Abdusattorov, Nodirbek"]
[Black "Bjerre, Jonas Buhl"]
[Result "1-0"]
[ECO "B92"]
[WhiteElo "2627"]
[BlackElo "2550"]
[Annotator "TA"]
[PlyCount "149"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 17,149,15,16,15,25,17,9,0,0,0,0,0,0,-7,3,-6,-8,-14,0,0,0,-26,18,37,25,16,15,16,29,0,19,0,95,79,114,105,125,113,237,233,225,75,157,158,166,85,88,87,88,66,73,75,74,71,72,64,71,73,74,65,59,63,78,14,14,8,228,9,19,8,8,0,29,34,44,14,22,14,20,20,38,38,42,42,42,42,30,30,30,-14,179,84,59,45,445,445,376,284,284,268,268,267,437,444,444,444,444,444,900,889,868,842,836,811,720,734,1534,1675,1668,1476,29968,29970,29966,6385,4134,3369,29972,29973,29973,29973,29973,29971,29972,29972]} 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. Bg5 Be6 9. Bxf6 Bxf6 10. Qd3 {B92: Sicilian Najdorf: 6 Be2.} Be7 11. O-O-O Nd7 12. Nd5 {The position is equal.} Bxd5 13. Qxd5 Qc7 14. Kb1 O-O 15. Nd2 Nf6 16. Qd3 Rfd8 17. Bf3 Rac8 {[#]} 18. c3 $146 ({Predecessor:} 18. Rhe1 Qb6 19. Re2 Rc5 20. Nc4 Qb4 21. Ne3 g6 22. h4 h5 23. g3 Qa4 24. Bg2 Ra5 25. Qb3 Qc6 26. Qc4 Rb5 27. f4 exf4 28. gxf4 Ng4 29. Rh1 {½-½ (29) Efroimski,M (2255)-Ushenina,A (2426) Skopje 2015}) 18... b5 19. Rhe1 a5 20. Qxb5 Rb8 21. Qa4 Qxc3 {[%csl Gb8][%cal Rc3b2]} 22. Nb3 Qc7 23. Rc1 Qb6 24. Re2 d5 (24... Ra8 $11 {keeps the balance.}) 25. exd5 $1 $16 {[%mdl 64] Discovered Attack} e4 ({Not} 25... Nxd5 $2 26. Rxe5 Qg6+ 27. Be4 $18) 26. Bxe4 Nxe4 27. Qxe4 ({Don't play} 27. Rxe4 Qg6 $14) 27... Bf6 (27... Bf8 $16) 28. Rc6 $18 Qb5 29. Qc4 (29. Nc5 $18) 29... Rxd5 (29... Qxc4 $142 30. Rxc4 Rxd5) 30. Qxb5 $16 Rdxb5 {[#]} 31. Rc5 ({White should try} 31. Ra6 $1 $18) 31... h5 32. Rxb5 Rxb5 {[%mdl 4096] Endgame KRB-KRN} 33. Re4 h4 34. Kc2 Rf5 35. f4 g5 36. fxg5 Rxg5 37. Re2 a4 38. Nd2 Rc5+ 39. Kb1 Bg5 40. a3 (40. b4 $16 axb3 41. axb3) 40... f5 $1 $11 41. Nf3 Rc1+ 42. Ka2 Bf6 43. h3 Kg7 44. Ne1 (44. Ne5 {keeps more tension.} Rd1 45. Nc4 f4 46. Rf2 Rg1 47. Nd2) 44... Kg6 (44... Rd1 {feels hotter.} 45. Nc2 Rd3 46. Nb4 Rd1 47. Na6 Rc1) 45. Nd3 Rc4 46. Kb1 Rd4 47. Kc2 Rc4+ 48. Kd2 Rd4 49. Re6 Kf7 50. Rb6 Bg5+ 51. Ke2 Re4+ 52. Kf1 Bf6 53. Rb4 Re3 $2 {[#]} (53... Rxb4 $11 {and Black stays safe.} 54. Nxb4 (54. axb4 Bxb2 55. b5 a3 $17) 54... Bxb2) 54. Nf4 (54. Nc5 $1 $18 {and White stays clearly on top.}) 54... Be5 55. Kf2 Bxf4 {[%mdl 8192] White stays focused until the end.} (55... Re4 $14 56. Rb7+ Kf6 57. Rb6+ Kf7 58. Rb7+ Kf6) 56. Rxf4 $14 {[%mdl 64] Double Attack. KR-KR} Rb3 57. Rxf5+ Kg6 58. Rf4 Rxb2+ 59. Kg1 Kh5 $2 (59... Rb1+ 60. Kh2 Ra1 61. Rxa4 Kf5 62. Rxh4 Rxa3) 60. Rxa4 $18 Ra2 61. Ra8 Kg5 62. a4 {[%cal Ba3a4,Ba4a5][%mdl 32]} Kg6 (62... Kf5 $142 63. a5 Kf6) 63. Rg8+ Kh5 64. Rg4 Rb2 65. Kf1 Rd2 66. Ke1 Rd8 67. a5 Re8+ 68. Kf2 Rf8+ 69. Ke3 Re8+ 70. Kf3 (70. Re4 $142 Ra8 71. Ra4 Kg5 72. a6 Kf6 73. Kd4 Ke7 74. Kc5 Kd7 75. a7) 70... Rf8+ 71. Rf4 Rg8 72. Ra4 {White mates.} Rf8+ 73. Ke4 Kg5 74. Ke5 Rf1 75. a6 {Weighted Error Value: White=0.16/Black=0.36} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "6.5"]
[White "Murzin, Volodar"]
[Black "Shuvalova, Polina"]
[Result "1-0"]
[ECO "C77"]
[WhiteElo "2478"]
[BlackElo "2476"]
[Annotator "TA"]
[PlyCount "175"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 16,175,16,8,20,-11,-11,-10,-10,-21,-12,-14,-18,-41,-28,-40,-31,-41,-31,-12,-35,-32,-38,-41,-28,-112,0,-83,45,-60,-60,-60,-60,-56,-54,-69,-74,-102,-103,-212,-48,-135,-29,-60,-4,-108,0,0,0,-65,-45,-41,-7,-6,-8,-7,0,-105,-87,-104,-8,-8,-10,0,37,0,0,0,0,0,0,0,0,-29,-11,-11,16,16,16,2,16,0,16,0,33,41,116,0,77,77,77,77,77,0,77,77,77,76,77,77,77,77,77,77,77,77,77,43,43,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,7,8,8,8,0,8,0,29971,29975,29981,29982,29982,29983,29983,29980,29984,29985,29985,29986,29986,29981,29981,29982,29982,29983,29983,29984,29988,29983,29986,29986]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d3 d6 6. c3 g6 7. O-O Bg7 8. Nbd2 O-O 9. Re1 Re8 {C77: Ruy Lopez: 3...a6 4 Ba4 Nf6, unusual lines.} 10. d4 b5 11. Bc2 exd4 {The position is equal.} 12. cxd4 Nb4 13. Bb1 c5 14. d5 {[#] next a3 is good for White.} a5 $146 ({Predecessor:} 14... c4 15. a3 Nd3 16. Bxd3 cxd3 17. Qb3 Ra7 18. Qxd3 Rae7 19. a4 Bd7 20. h3 bxa4 21. Qxa6 {0-1 (45) Wang,Y (2117)-Repka,C (2491) chess24.com INT 2021}) 15. a3 Na6 16. a4 Bd7 17. axb5 Bxb5 18. Ra3 Nb4 19. Nf1 a4 20. Bf4 {[#]} (20. Bg5 $11 {keeps the balance.}) 20... Qb6 (20... Nxe4 $1 $17 {[%mdl 512]} 21. Bxe4 Bxb2) 21. Qc1 (21. Ng3 $11) 21... Nd7 (21... Bxf1 $17 22. Kxf1 Nh5) 22. Ne3 (22. Bh6 $14) 22... c4 $1 $15 23. Ng4 Nd3 24. Bxd3 cxd3 25. Nh6+ Kf8 $1 26. Be3 {[#]} Rac8 $1 {[%mdl 512]} 27. Qd2 {[#]} (27. Bxb6 $2 Rxc1 28. Rxc1 Nxb6 $19) (27. Rc3 $17 {only move.} Rxc3 28. bxc3) (27. Rc3 Rxc3) 27... Nc5 $2 (27... Rc2 $1 $19 {[%cal Rc2d2][%mdl 512]} 28. Bxb6 Rxd2 29. Nxd2 Nxb6) 28. Qb4 (28. e5 $1 $15) 28... Na6 29. Qd2 $11 (29. Bxb6 $2 Nxb4 30. Ba5 Nc2 $19) 29... Qc7 (29... Qb7 $15 30. Bd4 Qe7) 30. Nd4 (30. Bg5 $11) 30... Qb7 ({Black should play} 30... Bxd4 $17 31. Bxd4 Rxe4) 31. f3 Nc5 32. Ng4 (32. Nxb5 $2 Qxb5 33. Bg5 Qxb2 $19) (32. Nhf5 $11 gxf5 33. Nxf5) 32... Bd7 $15 33. Nf2 Rb8 {Threatening ...Qb4.} 34. Nxd3 Nxd3 35. Qxd3 Qxb2 36. h3 (36. Raa1 $11 Rbc8 37. Ra3) 36... Rec8 $17 37. Nc6 Rb3 ({Better is} 37... Bxc6 $17 38. dxc6 Qb4) 38. Rxb3 $11 Qxb3 39. Qa6 Re8 40. Qa7 Bxc6 41. dxc6 a3 42. Bd4 a2 43. Bxg7+ Kxg7 {[%mdl 4096] Endgame KQR-KQR} 44. Kh2 (44. Qd4+ {with more complications.} Kg8 45. Rc1 Rc8 46. c7 Qb1 47. Qa1) 44... Qc3 45. Rd1 Qxc6 {Strongly threatening ...Ra8.} (45... Qb2 {looks sharper.} 46. c7 d5 47. exd5 Re2 48. Rg1 Rc2) 46. Qxa2 Qc5 47. Rd5 Qc3 48. Qf2 Re6 49. h4 h5 50. Qg3 Qf6 ({Black should try} 50... Qa3 $14) 51. Rxd6 Qe7 (51... Rxd6 $11 {remains equal.} 52. e5 {[%mdl 64] Double Attack} Qf5 53. exd6 Qf6) 52. Rd5 {aiming for Rxh5.} Kh7 53. Qf4 Qf6 54. Qg3 (54. Qg5 {feels hotter.} Qc3 55. Rd7 Kg7 56. Re7 Rf6 57. Re8) 54... Qe7 $1 55. Rg5 Qf6 56. Qb8 Qe7 57. Qf4 Qf6 58. Kg3 Qxf4+ 59. Kxf4 $16 {KR-KR} Ra6 60. Rd5 Ra2 61. g4 hxg4 62. fxg4 Rf2+ 63. Kg3 Re2 64. Kf3 Re1 65. h5 gxh5 66. gxh5 Kh6 67. Rf5 Rf1+ 68. Kg4 Re1 69. Kf4 Kg7 70. Ke5 Rh1 71. Rg5+ Kf8 $1 72. Kf6 Rf1+ 73. Rf5 Rh1 74. Ra5 {[%cal Ra5a8]} Rf1+ 75. Rf5 (75. Ke5 {is more complex.} Kg7 76. Ra6 f6+ 77. Kd4 Rd1+ 78. Ke3) 75... Rh1 76. e5 (76. Rd5 {keeps more tension.} Rf1+ 77. Kg5 Re1 78. Kf4 Kg7 79. Ke5) 76... Kg8 $2 {[%mdl 8192]} (76... Rh2 $11) 77. Ke7 {White mates.} Rg1 78. Rxf7 Rg5 79. e6 Rxh5 80. Rf1 Ra5 81. Rg1+ Kh7 82. Kf6 Ra2 83. e7 Rf2+ 84. Ke6 Re2+ 85. Kf7 Rf2+ {[#]} 86. Ke8 $1 Kh6 87. Rd1 Kg7 88. Kd8 {Weighted Error Value: White=0.30/Black=0.26} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "6.6"]
[White "Mammadzada, Gunay"]
[Black "Yoo, Christopher Woojin"]
[Result "1/2-1/2"]
[ECO "B33"]
[WhiteElo "2443"]
[BlackElo "2455"]
[Annotator "ChessBase"]
[PlyCount "124"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:06]} e6 {[%emt 0:00:01]} 3. d4 {[%emt 0:00:02]} cxd4 {[%emt 0:00:01]} 4. Nxd4 {[%emt 0:00:02]} Nf6 {[%emt 0:00:02]} 5. Nc3 {[%emt 0:00:02]} Qb6 {[%emt 0:00:06]} 6. a3 {[%emt 0:03:59]} Nc6 {[%emt 0:01:36]} 7. Nb3 {[%emt 0:00:29]} Qc7 {[%emt 0:00:55]} 8. Be3 {[%emt 0:00:24]} Be7 {[%emt 0:01:19]} 9. Be2 {[%emt 0:01:36]} O-O {[%emt 0:00:06]} 10. O-O {[%emt 0:00:01]} a6 {[%emt 0:01:26]} 11. f4 {[%emt 0:00:06]} b5 {[%emt 0:00:28]} 12. e5 {[%emt 0:00:37]} Ne8 {[%emt 0:00:02]} 13. Bd3 {[%emt 0:00:17]} d6 {[%emt 0:00:58]} 14. Be4 {[%emt 0:01:21]} Bb7 {[%emt 0:00:41]} 15. Qh5 {[%emt 0:01:36]} g6 {[%emt 0:01:24]} 16. Qe2 {[%emt 0:00:02]} Ng7 {[%emt 0:00:27]} 17. exd6 {[%emt 0:00:08]} Bxd6 {[%emt 0:00:02]} 18. Nc5 {[%emt 0:00:11]} Nd4 {[%emt 0:00:55]} 19. Bxd4 {[%emt 0:00:10]} Bxc5 {[%emt 0:00:02]} 20. Bxc5 {[%emt 0:00:03]} Qxc5+ {[%emt 0:00:00]} 21. Kh1 {[%emt 0:00:01]} Bd5 {[%emt 0:00:16]} 22. Nxd5 {[%emt 0:00:13]} exd5 {[%emt 0:00:00]} 23. Bd3 {[%emt 0:00:01]} Rfe8 {[%emt 0:00:07]} 24. Qg4 {[%emt 0:00:05]} f5 {[%emt 0:00:12]} 25. Qf3 {[%emt 0:00:03]} Re3 {[%emt 0:00:06]} 26. Qf2 {[%emt 0:00:01]} d4 {[%emt 0:00:05]} 27. b4 {[%emt 0:00:10]} Qd6 {[%emt 0:00:12]} 28. a4 {[%emt 0:00:03]} Rb8 {[%emt 0:00:04]} 29. axb5 {[%emt 0:00:04]} axb5 {[%emt 0:00:00]} 30. Qd2 {[%emt 0:00:02]} Ne6 {[%emt 0:00:08]} 31. Rae1 {[%emt 0:00:27]} Rxe1 {[%emt 0:00:22]} 32. Qxe1 {[%emt 0:00:00]} Nc7 {[%emt 0:00:09]} 33. Qa1 {[%emt 0:00:10]} Ra8 {[%emt 0:00:09]} 34. Qb2 {[%emt 0:00:03]} Ra4 {[%emt 0:00:04]} 35. Bxb5 {[%emt 0:00:09]} Qxb4 {[%emt 0:00:08]} 36. Qb3+ {[%emt 0:00:09]} Qxb3 {[%emt 0:00:03]} 37. cxb3 {[%emt 0:00:00]} Ra2 {[%emt 0:00:11]} 38. Bc4+ {[%emt 0:00:00]} Kg7 {[%emt 0:00:02]} 39. Rd1 {[%emt 0:00:12]} Kf6 {[%emt 0:00:14]} 40. Kg1 {[%emt 0:00:02]} Ne6 {[%emt 0:00:08]} 41. Bxe6 {[%emt 0:00:04]} Kxe6 {[%emt 0:00:00]} 42. Rxd4 {[%emt 0:00:01]} Rb2 {[%emt 0:00:01]} 43. Rb4 {[%emt 0:00:12]} Kf6 {[%emt 0:00:02]} 44. h3 {[%emt 0:00:00]} h5 {[%emt 0:00:05]} 45. Rb6+ {[%emt 0:00:07]} Kg7 {[%emt 0:00:02]} 46. h4 {[%emt 0:00:03]} Kh7 {[%emt 0:00:03]} 47. Kh2 {[%emt 0:00:01]} Kg7 {[%emt 0:00:04]} 48. Kg3 {[%emt 0:00:01]} Rc2 {[%emt 0:00:06]} 49. Kf3 {[%emt 0:00:10]} Rc3+ {[%emt 0:00:05]} 50. Kf2 {[%emt 0:00:08]} Rc2+ {[%emt 0:00:01]} 51. Kg3 {[%emt 0:00:01]} Rc3+ {[%emt 0:00:02]} 52. Kh2 {[%emt 0:00:01]} Rc2 {[%emt 0:00:02]} 53. b4 {[%emt 0:00:01]} Rc4 {[%emt 0:00:07]} 54. Kg3 {[%emt 0:00:10]} Rc3+ {[%emt 0:00:02]} 55. Kf2 {[%emt 0:00:01]} Rc2+ {[%emt 0:00:01]} 56. Kf3 {[%emt 0:00:06]} Rc3+ {[%emt 0:00:02]} 57. Ke2 {[%emt 0:00:19]} Rc2+ {[%emt 0:00:17]} 58. Kf3 {[%emt 0:00:09]} Rc3+ {[%emt 0:00:01]} 59. Kf2 {[%emt 0:00:03]} Rc2+ {[%emt 0:00:02]} 60. Kg3 {[%emt 0:00:06]} Rc3+ {[%emt 0:00:01]} 61. Kh2 {[%emt 0:00:01]} Rc4 {[%emt 0:00:01]} 62. Kg3 {[%emt 0:00:10]} Rc3+ {[%emt 0:00:02]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "6.7"]
[White "Nihal Sarin"]
[Black "Liang, Awonder"]
[Result "1-0"]
[ECO "D52"]
[WhiteElo "2620"]
[BlackElo "2592"]
[Annotator "TA"]
[PlyCount "45"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,45,23,41,30,33,24,23,28,60,38,44,53,40,54,92,94,176,177,681,677,749,622,420,375,371,368,331,227,533,434,1787,1720,1539,1484]} 1. Nf3 c6 2. d4 Nf6 3. c4 d5 4. Nc3 e6 5. Bg5 Nbd7 6. e3 Qa5 7. Nd2 Be7 8. cxd5 {D52: Queen's Gambit Declined: Cambridge Springs Variation.} exd5 9. Bd3 Nf8 10. O-O {White has an edge.} Ng6 {[#]} 11. f4 $146 ({Predecessor:} 11. Rb1 O-O 12. Bxf6 Bxf6 13. b4 Qd8 14. b5 c5 15. Ne2 cxd4 16. Nxd4 Bxd4 17. exd4 {1-0 (46) Zwanowetz,T-Kuecher,W Imst 2008}) 11... h6 12. Bxf6 Bxf6 13. Qh5 O-O 14. Nf3 Ne7 {[#]} (14... Qb4 $16) 15. Ne4 $1 $18 {[%cal Re4f6][%mdl 576] Pin} Qd8 $2 (15... Be5) 16. Nxf6+ gxf6 17. Qxh6 {[%csl Gd3][%cal Rh6h7]} Bf5 18. Rad1 {[%cal Ba1d1,Bd1d3,Bd3g3][%mdl 32] Black must now prevent Nh4.} Bxd3 19. Rxd3 {[#] Strongly threatening Nh4.} Nf5 20. Qh3 Ng7 (20... Qc8 {is a better chance.} 21. Qg4+ Kh7 22. Qh5+ Nh6 23. Ng5+ Kg7) 21. Nh4 {White is clearly winning.} Qe7 (21... Qc8 $142 22. g4 Rd8) 22. e4 {Threatening mate with Rg3!} Qxe4 23. Rg3 {Weighted Error Value: White=0.22/Black=0.80} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "6.8"]
[White "Badelka, Olga"]
[Black "Saduakassova, Dinara"]
[Result "1-0"]
[ECO "A39"]
[WhiteElo "2433"]
[BlackElo "2500"]
[Annotator "ChessBase"]
[PlyCount "79"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. Nf3 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. g3 {[%emt 0:00:00]} c5 {[%emt 0:00:15]} 3. Bg2 {[%emt 0:00:08]} Nc6 {[%emt 0:00:03]} 4. O-O {[%emt 0:00:18]} g6 {[%emt 0:02:22]} 5. d4 {[%emt 0:00:23]} cxd4 {[%emt 0:02:46]} 6. Nxd4 {[%emt 0:05:05]} Bg7 {[%emt 0:00:04]} 7. c4 {[%emt 0:00:02]} O-O {[%emt 0:00:36]} 8. Nc3 {[%emt 0:00:04]} Nxd4 {[%emt 0:00:59]} 9. Qxd4 {[%emt 0:00:02]} d6 {[%emt 0:00:00]} 10. Qd2 {[%emt 0:00:15]} Qc7 {[%emt 0:00:18]} 11. b3 {[%emt 0:00:04]} Bd7 {[%emt 0:00:03]} 12. Bb2 {[%emt 0:00:02]} Bc6 {[%emt 0:00:01]} 13. Nd5 {[%emt 0:00:13]} Bxd5 {[%emt 0:00:10]} 14. cxd5 {[%emt 0:00:02]} Rac8 {[%emt 0:00:30]} 15. Rac1 {[%emt 0:00:03]} Qb6 {[%emt 0:00:28]} 16. e3 {[%emt 0:00:56]} Nd7 {[%emt 0:00:17]} 17. Bxg7 {[%emt 0:00:19]} Kxg7 {[%emt 0:00:03]} 18. h4 {[%emt 0:00:01]} Nf6 {[%emt 0:00:06]} 19. Rc2 {[%emt 0:00:16]} Rxc2 {[%emt 0:00:05]} 20. Qxc2 {[%emt 0:00:01]} Qc5 {[%emt 0:00:03]} 21. Qxc5 {[%emt 0:00:14]} dxc5 {[%emt 0:00:00]} 22. e4 {[%emt 0:00:01]} Nd7 {[%emt 0:00:04]} 23. f4 {[%emt 0:00:06]} Rd8 {[%emt 0:01:14]} 24. Rc1 {[%emt 0:00:38]} b6 {[%emt 0:00:19]} 25. e5 {[%emt 0:00:07]} h6 {[%emt 0:00:51]} 26. Kf2 {[%emt 0:00:26]} g5 {[%emt 0:00:03]} 27. Ke3 {[%emt 0:00:07]} a5 {[%emt 0:00:06]} 28. Be4 {[%emt 0:00:08]} Nf8 {[%emt 0:00:09]} 29. Rh1 {[%emt 0:00:52]} Rd7 {[%emt 0:00:09]} 30. hxg5 {[%emt 0:00:24]} hxg5 {[%emt 0:00:13]} 31. f5 {[%emt 0:00:02]} Ra7 {[%emt 0:00:02]} 32. a4 {[%emt 0:00:04]} Nd7 {[%emt 0:00:04]} 33. e6 {[%emt 0:00:07]} Nf6 {[%emt 0:00:02]} 34. Rd1 {[%emt 0:00:23]} Ra8 {[%emt 0:00:04]} 35. d6 {[%emt 0:00:03]} Nxe4 {[%emt 0:00:03]} 36. Kxe4 {[%emt 0:00:05]} Kf6 {[%emt 0:00:02]} 37. d7 {[%emt 0:00:13]} Rd8 {[%emt 0:00:02]} 38. exf7 {[%emt 0:00:01]} Kxf7 {[%emt 0:00:01]} 39. Ke5 {[%emt 0:00:01]} g4 {[%emt 0:00:06]} 40. Rd2 {[%emt 0:00:03]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "6.9"]
[White "Lei, Tingjie"]
[Black "Salimova, Nurgyul"]
[Result "1-0"]
[ECO "D10"]
[WhiteElo "2505"]
[BlackElo "2397"]
[Annotator "ChessBase"]
[PlyCount "69"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 3. cxd5 {[%emt 0:00:39]} cxd5 {[%emt 0:00:00]} 4. Bf4 {[%emt 0:00:01]} Nc6 {[%emt 0:01:02]} 5. e3 {[%emt 0:00:03]} Nf6 {[%emt 0:00:08]} 6. Nc3 {[%emt 0:00:03]} a6 {[%emt 0:00:27]} 7. Be2 {[%emt 0:00:56]} e6 {[%emt 0:01:39]} 8. Rc1 {[%emt 0:00:12]} Bd6 {[%emt 0:00:29]} 9. Bxd6 {[%emt 0:00:19]} Qxd6 {[%emt 0:00:01]} 10. f4 {[%emt 0:00:22]} O-O {[%emt 0:00:26]} 11. Nf3 {[%emt 0:00:04]} Bd7 {[%emt 0:00:35]} 12. Ne5 {[%emt 0:00:09]} Rac8 {[%emt 0:00:22]} 13. O-O {[%emt 0:00:05]} Ne7 {[%emt 0:00:15]} 14. Bd3 {[%emt 0:01:37]} b5 {[%emt 0:00:18]} 15. Qe2 {[%emt 0:01:33]} b4 {[%emt 0:00:27]} 16. Nb1 {[%emt 0:00:03]} a5 {[%emt 0:00:10]} 17. Nd2 {[%emt 0:00:02]} a4 {[%emt 0:00:34]} 18. g4 {[%emt 0:00:22]} g6 {[%emt 0:00:41]} 19. g5 {[%emt 0:00:56]} Nh5 {[%emt 0:00:11]} 20. Ndf3 {[%emt 0:00:08]} Nf5 {[%emt 0:00:41]} 21. Nxd7 {[%emt 0:00:46]} Qxd7 {[%emt 0:00:14]} 22. Ne5 {[%emt 0:00:04]} Qa7 {[%emt 0:00:30]} 23. Bxf5 {[%emt 0:00:08]} exf5 {[%emt 0:00:04]} 24. Qb5 {[%emt 0:00:02]} Rxc1 {[%emt 0:00:16]} 25. Rxc1 {[%emt 0:00:02]} Nxf4 {[%emt 0:00:07]} 26. Nc6 {[%emt 0:01:26]} Nh3+ {[%emt 0:01:12]} 27. Kg2 {[%emt 0:00:56]} Qd7 {[%emt 0:00:07]} 28. Kxh3 {[%emt 0:00:15]} f4+ {[%emt 0:00:01]} 29. Kh4 {[%emt 0:00:02]} h5 {[%emt 0:00:18]} 30. h3 {[%emt 0:00:33]} Re8 {[%emt 0:00:18]} 31. Na7 {[%emt 0:00:03]} Qe6 {[%emt 0:00:31]} 32. Qxe8+ {[%emt 0:00:02]} Qxe8 {[%emt 0:00:01]} 33. Rc8 {[%emt 0:00:01]} Qxc8 {[%emt 0:00:03]} 34. Nxc8 {[%emt 0:00:01]} fxe3 {[%emt 0:00:36]} 35. Kg3 {[%emt 0:00:03]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "6.10"]
[White "Yip, Carissa"]
[Black "Praggnanandhaa R"]
[Result "0-1"]
[ECO "B67"]
[WhiteElo "2430"]
[BlackElo "2608"]
[Annotator "TA"]
[PlyCount "60"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 19,60,27,20,-16,-5,0,-17,-14,-15,-23,-18,-18,-10,-42,-41,-42,-37,-49,-49,-25,-26,-104,-104,-178,-177,-191,-188,-191,-189,-266,-215,-545,-543,-4986,-3531,-3439,-2640,-29988,-29989,-29989,-29990,-29990,-29988]} 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Bd7 9. f4 b5 {[%cal Bb7b5,Bb5b4][%mdl 32]} 10. Nxc6 Bxc6 11. f5 {11.Qe1 is becoming the main line. B67: Sicilian: Richter-Rauzer: 7...a6 8 0-0-0 Bd7, lines without 9 f4 Be7.} b4 {[#]} 12. Bxf6 $146 ({Predecessor:} 12. Nd5 Nxe4 13. Bxd8 Nxd2 14. Nxb4 Nxf1 15. Rhxf1 Bb5 16. Bc7 Bxf1 17. Rxf1 Be7 18. fxe6 fxe6 {0-1 (43) Jewell,B (1531)-Phillips,G (1812) IECC email 2003}) 12... Qxf6 13. Ne2 {[%cal Re2d4] The position is equal.} Be7 ({But not} 13... Bxe4 $6 14. fxe6 fxe6 15. Qxb4 $16) 14. Nd4 Bxe4 {Hoping for ...e5.} 15. fxe6 fxe6 {Threatening ...0-0.} 16. Re1 (16. Bd3 $5 {[%cal Rd3e4]} Bd5 17. Kb1 $11) 16... Bd5 $36 {[%mdl 2048] White is under pressure.} 17. Bd3 O-O $1 (17... Qxd4 $2 18. Bg6+ $1 {[%mdl 512]} hxg6 19. Qxd4 $18) 18. Kb1 Qf7 19. Rhf1 Bf6 20. g4 Qd7 $17 21. Nb3 {[#]} (21. Qe3 $17) 21... a5 $1 $19 22. g5 Be5 23. Rxf8+ Rxf8 24. Nxa5 (24. Be4 $142) 24... Qa4 25. Nb3 $2 (25. Nc4 {nothing else works.}) 25... Ra8 26. Bxh7+ Kxh7 27. Qd3+ Kg8 28. Qh3 Qxa2+ {[%mdl 64] Double Attack. Black mates.} 29. Kc1 Qxb2+ 30. Kd1 Bxb3 {[%csl Gb3][%cal Rb2c2] Weighted Error Value: White=0.87/Black=0.04} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "7.1"]
[White "Praggnanandhaa R"]
[Black "Zhu, Jiner"]
[Result "1-0"]
[ECO "C00"]
[WhiteElo "2608"]
[BlackElo "2459"]
[Annotator "TA"]
[PlyCount "159"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 21,159,-45,-29,-17,-17,-38,3,14,23,-19,27,5,55,54,61,0,0,-16,-14,-28,0,10,49,37,51,0,172,166,155,134,162,135,414,408,424,427,405,424,419,415,407,359,551,550,593,560,549,541,528,452,462,441,29981,29982,29992,706,29981,29982,5831,431,429,421,328,211,211,195,192,188,188,180,188,188,267,195,195,170,176,131,195,195,187,100,100,100,100,100,129,100,129,100,129,129,129,129,129,129,129,129,129,129,129,82,82,82,96,82,82,82,129,82,129,75,129,129,129,129,129,129,132,61,134,134,139,139,139,108,95,95,29974,29975,29976,29977,29974,29978,29977,29978,29985,29986,29986,29987]} 1. Nf3 Nf6 2. g3 e6 3. Bg2 d5 4. O-O c5 5. d3 Nc6 6. Nbd2 Be7 7. e4 Qc7 8. Re1 O-O 9. e5 Nd7 10. Qe2 b5 11. Nf1 b4 {Recently 11...Bb7 got a lot of attention.} 12. Bf4 {C00: French: Unusual White 2nd moves.} a5 13. Ne3 Qb6 14. h4 {[#] The position is equal.} Bb7 $146 ({Predecessor:} 14... Ba6 15. Ng5 Bxg5 16. hxg5 Rae8 17. Ng4 Nd4 18. Qd2 Kh8 19. Kh2 Rc8 20. c3 Nf5 21. Rac1 Rfd8 22. Rh1 Rb8 23. Bf3 Bb7 24. Qe2 {½-½ (24) Fehling,M (2235)-Kapfer,T Germany 1998}) 15. Qd2 Rfd8 16. h5 a4 17. h6 g6 $1 18. a3 (18. c4 $14) 18... Nd4 $11 19. Nxd4 cxd4 20. Ng4 bxa3 21. bxa3 Qa5 22. Qc1 Rdc8 23. Bg5 (23. Bd2 $14 Qd8 24. Ra2) 23... Qd8 $2 (23... Bf8 $11 {and Black has nothing to worry.}) 24. Bxe7 $18 Qxe7 25. Rb1 $36 {[%mdl 2048] Keeping Black busy.} Ba6 26. Rb4 $1 Bxd3 $2 {[%mdl 8192]} (26... Rc3 $16 {is a better defense.}) 27. Rb7 $1 {[%cal Rb7d7]} Kh8 28. Nf6 Bb5 29. Rxb5 Nxf6 30. exf6 Qxf6 31. Qd2 Rc4 (31... g5 $142 32. Rb6 Rab8) 32. Reb1 Qe5 33. Rb7 Kg8 34. Bf1 Rc3 35. Bd3 Rac8 36. Ra7 Rxa3 (36... R3c7 $18) 37. Qb4 {[%mdl 64] Double Attack} Rac3 38. Qb7 (38. Qe7 $142 Rf8 39. Rb8 $3 {[%mdl 576] Deflection} Qxb8 40. Qf6 $1 {[%mdl 512]} Qe5 41. Qxe5 f6 42. Qxe6+ Kh8 43. Qe7 {[%mdl 64] Double Attack} Rf7 44. Qe8+ {[%mdl 64] Double Attack} Rf8 45. Qxf8#) 38... Rf8 39. Ra8 Qd6 {[#]} 40. Qa7 (40. Qb8 $142 $3 {[%mdl 512] White wants to mate with Qxf8+.} Rb3 41. Rxb3 axb3 42. Qxd6 Rxa8 43. Qe5) 40... Rcc8 41. Rxc8 Rxc8 42. Qxd4 {[%csl Gh6][%cal Rd4g7]} Qf8 43. Qxa4 Qxh6 44. Qd7 Rf8 45. Qd6 Qd2 46. Kg2 h5 (46... Qc3 $142 47. Qe7 Kg7) 47. Rb7 {Hoping for Bxg6!} Qg5 48. Qb4 Qf6 49. Qb2 Qg5 (49... Qxb2 $16 50. Rxb2 Rc8) 50. Qd4 Rc8 51. Qh4 ({Better is} 51. Ra7 $18) 51... Qxh4 $16 52. gxh4 {[%mdl 4096] Endgame KRB-KR} Kg7 53. Kg3 Kf6 54. f3 Rc5 55. Rd7 Rc8 56. Ra7 Rb8 57. Ra1 Rb4 58. f4 Rb7 59. Kf3 Rb4 60. Ke3 Rb7 61. Kd2 Rb4 {[#]} 62. Rf1 $1 Rb7 63. Kc3 Rc7+ 64. Kd4 Rc8 65. Rb1 Rc7 66. Rb6 ({White should play} 66. Ra1) 66... Rc8 ({Black should try} 66... Ra7) 67. Rb7 Rc6 68. c3 Rc8 69. Bb5 Ra8 70. Kc5 (70. Ke3 $16) 70... Rf8 (70... Ra3 $14) 71. Kd6 Rc8 72. Bc6 Rf8 73. Bd7 Ra8 74. Rc7 Rd8 $2 {[%mdl 8192] [#]} (74... Rb8 $16 75. Bc6 Rd8+ 76. Rd7 Rc8) 75. Rc8 $1 {[%cal Rc8d8] White mates.} Rxc8 76. Bxc8 Kf5 77. Ke7 Kxf4 78. Kxf7 g5 79. hxg5 Kxg5 80. Kxe6 {Weighted Error Value: White=0.26/Black=0.48} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "7.2"]
[White "Salimova, Nurgyul"]
[Black "Yip, Carissa"]
[Result "1-0"]
[ECO "D76"]
[WhiteElo "2397"]
[BlackElo "2430"]
[Annotator "NA"]
[PlyCount "109"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. g3 {[%emt 0:00:02]} Bg7 {[%emt 0:00:14]} 4. Bg2 {[%emt 0:00:03]} d5 {[%emt 0:00:02]} 5. cxd5 {[%emt 0:00:20]} Nxd5 {[%emt 0:00:01]} 6. Nf3 {[%emt 0:00:05]} Nb6 {[%emt 0:00:04]} 7. O-O {[%emt 0:00:15]} Nc6 {[%emt 0:00:02]} 8. e3 {[%emt 0:00:06]} O-O {[%emt 0:00:02]} 9. Nc3 {[%emt 0:00:14]} Re8 {[%emt 0:00:11]} 10. Nh4 {[%emt 0:00:19]} e5 {[%emt 0:00:11]} 11. d5 {[%emt 0:00:04]} Nb4 {[%emt 0:00:05]} 12. e4 {[%emt 0:00:49]} c6 {[%emt 0:00:18]} 13. a3 {[%emt 0:00:38]} Na6 {[%emt 0:00:03]} 14. Be3 {[%emt 0:00:34]} cxd5 {[%emt 0:01:23]} 15. Bxb6 {[%emt 0:01:25]} Qxb6 {[%emt 0:00:03]} 16. Nxd5 {[%emt 0:00:03]} Qxb2 {[%emt 0:00:14]} 17. Qf3 {[%emt 0:01:12]} Qb5 {[%emt 0:01:12]} 18. Rab1 {[%emt 0:00:10]} Qd7 {[%emt 0:00:24]} 19. Rfc1 {[%emt 0:00:25]} b6 {[%emt 0:00:55]} 20. Bf1 {[%emt 0:00:12]} Bb7 {[%emt 0:02:18]} 21. Bb5 {[%emt 0:01:11]} Qd6 {[%emt 0:00:22]} 22. Bxe8 {[%emt 0:00:14]} Rxe8 {[%emt 0:00:02]} 23. Ng2 {[%emt 0:00:23]} Nc5 {[%emt 0:00:34]} 24. Rd1 {[%emt 0:00:14]} Qb8 {[%emt 0:01:05]} 25. Nge3 {[%emt 0:00:09]} h5 {[%emt 0:00:14]} 26. Qg2 {[%emt 0:00:12]} Ne6 {[%emt 0:00:05]} 27. f3 {[%emt 0:00:37]} Nd4 {[%emt 0:00:06]} 28. Qf2 {[%emt 0:00:26]} Ba6 {[%emt 0:00:18]} 29. Rd2 {[%emt 0:00:16]} Qd6 {[%emt 0:00:23]} 30. a4 {[%emt 0:00:10]} Bf8 {[%emt 0:00:47]} 31. Kg2 {[%emt 0:00:10]} Qd8 {[%emt 0:00:15]} 32. Nb4 {[%emt 0:00:44]} Bb7 {[%emt 0:00:06]} 33. Nbd5 {[%emt 0:00:37]} Bc5 {[%emt 0:00:09]} 34. Qf1 {[%emt 0:00:07]} Kg7 {[%emt 0:00:08]} 35. a5 {[%emt 0:00:09]} f5 {[%emt 0:00:24]} 36. axb6 {[%emt 0:00:11]} axb6 {[%emt 0:00:01]} 37. Qc4 {[%emt 0:00:08]} Rf8 {[%emt 0:00:17]} 38. Ra1 {[%emt 0:00:02]} f4 {[%emt 0:00:02]} 39. Ra7 {[%emt 0:00:06]} Rf7 {[%emt 0:00:03]} 40. Rxb7 {[%emt 0:00:11]} Rxb7 {[%emt 0:00:02]} 41. Nf1 {[%emt 0:00:01]} Rf7 {[%emt 0:00:05]} 42. Rd3 {[%emt 0:00:06]} Qf8 {[%emt 0:00:04]} 43. gxf4 {[%emt 0:00:01]} Qd8 {[%emt 0:00:08]} 44. fxe5 {[%emt 0:00:05]} Qg5+ {[%emt 0:00:01]} 45. Ng3 {[%emt 0:00:01]} h4 {[%emt 0:00:05]} 46. f4 {[%emt 0:00:01]} Qg4 {[%emt 0:00:01]} 47. h3 {[%emt 0:00:01]} Qc8 {[%emt 0:00:03]} 48. Rxd4 {[%emt 0:00:05]} hxg3 {[%emt 0:00:03]} 49. Rd3 {[%emt 0:00:08]} Qa8 {[%emt 0:00:20]} 50. e6 {[%emt 0:00:07]} Ra7 {[%emt 0:00:06]} 51. Qc3+ {[%emt 0:00:08]} Kh6 {[%emt 0:00:01]} 52. Rd2 {[%emt 0:00:08]} Ra1 {[%emt 0:00:03]} 53. Ne3 {[%emt 0:00:07]} Ra3 {[%emt 0:00:02]} 54. Ng4+ {[%emt 0:00:01]} Kh7 {[%emt 0:00:08]} 55. Rd7+ {[%emt 0:00:06]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "7.3"]
[White "Saduakassova, Dinara"]
[Black "Lei, Tingjie"]
[Result "0-1"]
[ECO "E05"]
[WhiteElo "2500"]
[BlackElo "2505"]
[Annotator "ChessBase"]
[PlyCount "114"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:04]} d5 {[%emt 0:00:00]} 4. g3 {[%emt 0:00:01]} Be7 {[%emt 0:00:00]} 5. Bg2 {[%emt 0:00:02]} O-O {[%emt 0:00:01]} 6. O-O {[%emt 0:00:01]} dxc4 {[%emt 0:00:02]} 7. Qc2 {[%emt 0:00:04]} a6 {[%emt 0:00:01]} 8. a4 {[%emt 0:00:01]} c5 {[%emt 0:00:02]} 9. dxc5 {[%emt 0:00:07]} Bxc5 {[%emt 0:00:02]} 10. Nbd2 {[%emt 0:00:15]} b5 {[%emt 0:01:50]} 11. axb5 {[%emt 0:00:09]} Bb7 {[%emt 0:00:03]} 12. Nxc4 {[%emt 0:00:51]} axb5 {[%emt 0:00:13]} 13. Rxa8 {[%emt 0:00:02]} Bxa8 {[%emt 0:00:02]} 14. Nce5 {[%emt 0:00:23]} Qc7 {[%emt 0:03:17]} 15. Be3 {[%emt 0:00:20]} Na6 {[%emt 0:00:13]} 16. Bxc5 {[%emt 0:00:25]} Qxc5 {[%emt 0:00:03]} 17. Qxc5 {[%emt 0:00:09]} Nxc5 {[%emt 0:00:02]} 18. Nd4 {[%emt 0:00:08]} Bxg2 {[%emt 0:01:14]} 19. Kxg2 {[%emt 0:00:03]} Rd8 {[%emt 0:01:57]} 20. Nxb5 {[%emt 0:01:07]} Rb8 {[%emt 0:00:23]} 21. Nd6 {[%emt 0:01:22]} Rxb2 {[%emt 0:00:20]} 22. Rc1 {[%emt 0:01:04]} Nfd7 {[%emt 0:00:23]} 23. Nxd7 {[%emt 0:00:55]} Nxd7 {[%emt 0:00:03]} 24. Rc7 {[%emt 0:00:12]} Nf8 {[%emt 0:00:04]} 25. e3 {[%emt 0:01:04]} Rd2 {[%emt 0:00:46]} 26. Nxf7 {[%emt 0:00:43]} Rd5 {[%emt 0:00:14]} 27. f4 {[%emt 0:00:48]} Rd7 {[%emt 0:00:08]} 28. Rxd7 {[%emt 0:00:02]} Nxd7 {[%emt 0:00:01]} 29. Ng5 {[%emt 0:00:01]} Nc5 {[%emt 0:00:02]} 30. Kf3 {[%emt 0:00:02]} h6 {[%emt 0:00:03]} 31. Ne4 {[%emt 0:00:02]} Nd7 {[%emt 0:00:11]} 32. g4 {[%emt 0:00:01]} Kf7 {[%emt 0:00:03]} 33. Ng3 {[%emt 0:00:03]} Nc5 {[%emt 0:00:06]} 34. h4 {[%emt 0:00:03]} Ke7 {[%emt 0:00:33]} 35. g5 {[%emt 0:00:10]} hxg5 {[%emt 0:00:22]} 36. fxg5 {[%emt 0:00:02]} Kf7 {[%emt 0:00:06]} 37. Ne4 {[%emt 0:00:04]} Nd3 {[%emt 0:00:02]} 38. h5 {[%emt 0:00:06]} Ne5+ {[%emt 0:00:02]} 39. Kf4 {[%emt 0:00:45]} Nd3+ {[%emt 0:00:01]} 40. Kg3 {[%emt 0:00:01]} Ne5 {[%emt 0:00:01]} 41. Kf4 {[%emt 0:00:07]} Nd3+ {[%emt 0:00:01]} 42. Kg4 {[%emt 0:00:01]} Ne5+ {[%emt 0:00:01]} 43. Kg3 {[%emt 0:00:02]} Nc4 {[%emt 0:00:04]} 44. Kf4 {[%emt 0:00:07]} Nb6 {[%emt 0:00:14]} 45. Nd6+ {[%emt 0:00:20]} Ke7 {[%emt 0:00:03]} 46. Nb5 {[%emt 0:01:01]} Nd5+ {[%emt 0:00:16]} 47. Ke4 {[%emt 0:00:04]} Kf7 {[%emt 0:00:00]} 48. Nd6+ {[%emt 0:00:10]} Ke7 {[%emt 0:00:01]} 49. Nc4 {[%emt 0:00:05]} Nb4 {[%emt 0:00:12]} 50. Kf4 {[%emt 0:00:07]} Nc6 {[%emt 0:00:08]} 51. e4 {[%emt 0:00:04]} Nb4 {[%emt 0:00:04]} 52. Nb6 {[%emt 0:00:02]} Kf7 {[%emt 0:00:03]} 53. Nc8 {[%emt 0:00:06]} Nd3+ {[%emt 0:00:01]} 54. Ke3 {[%emt 0:00:02]} Ne5 {[%emt 0:00:02]} 55. Nd6+ {[%emt 0:00:02]} Ke7 {[%emt 0:00:01]} 56. Nb5 {[%emt 0:00:02]} Kf7 {[%emt 0:00:04]} 57. Nd4 {[%emt 0:00:41]} Nc4+ {[%emt 0:00:06]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "7.4"]
[White "Liang, Awonder"]
[Black "Badelka, Olga"]
[Result "1-0"]
[ECO "E04"]
[WhiteElo "2592"]
[BlackElo "2433"]
[Annotator "ChessBase"]
[PlyCount "67"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. c4 {[%emt 0:00:00]} d5 {[%emt 0:00:02]} 4. g3 {[%emt 0:00:00]} dxc4 {[%emt 0:00:04]} 5. Bg2 {[%emt 0:00:02]} c6 {[%emt 0:00:01]} 6. O-O {[%emt 0:00:06]} b5 {[%emt 0:00:05]} 7. a4 {[%emt 0:00:12]} Bb7 {[%emt 0:00:13]} 8. Ng5 {[%emt 0:01:38]} a6 {[%emt 0:00:15]} 9. e4 {[%emt 0:00:02]} Be7 {[%emt 0:00:20]} 10. e5 {[%emt 0:00:13]} Nd5 {[%emt 0:00:10]} 11. Qh5 {[%emt 0:00:13]} g6 {[%emt 0:01:04]} 12. Qh6 {[%emt 0:00:05]} Bf8 {[%emt 0:00:11]} 13. Qh3 {[%emt 0:00:04]} Nd7 {[%emt 0:01:22]} 14. Nc3 {[%emt 0:00:15]} Nxc3 {[%emt 0:02:03]} 15. bxc3 {[%emt 0:00:00]} Be7 {[%emt 0:00:07]} 16. Ne4 {[%emt 0:01:04]} c5 {[%emt 0:02:37]} 17. Nd6+ {[%emt 0:00:38]} Bxd6 {[%emt 0:00:03]} 18. Bxb7 {[%emt 0:00:00]} Rb8 {[%emt 0:00:21]} 19. Bc6 {[%emt 0:00:29]} Be7 {[%emt 0:00:52]} 20. axb5 {[%emt 0:00:19]} O-O {[%emt 0:00:14]} 21. bxa6 {[%emt 0:00:02]} Qc7 {[%emt 0:00:20]} 22. Qg2 {[%emt 0:00:11]} Qa7 {[%emt 0:00:12]} 23. Be3 {[%emt 0:00:07]} cxd4 {[%emt 0:00:17]} 24. cxd4 {[%emt 0:00:11]} Nb6 {[%emt 0:00:11]} 25. d5 {[%emt 0:00:37]} exd5 {[%emt 0:00:02]} 26. Bxd5 {[%emt 0:00:01]} Rfc8 {[%emt 0:00:22]} 27. e6 {[%emt 0:00:23]} f6 {[%emt 0:00:03]} 28. Bb7 {[%emt 0:00:01]} Rc7 {[%emt 0:00:12]} 29. Rfb1 {[%emt 0:00:38]} Bc5 {[%emt 0:00:02]} 30. Bf4 {[%emt 0:00:04]} Rbxb7 {[%emt 0:00:20]} 31. axb7 {[%emt 0:00:00]} Qxb7 {[%emt 0:00:01]} 32. Qxb7 {[%emt 0:00:57]} Rxb7 {[%emt 0:00:01]} 33. Rb5 {[%emt 0:00:00]} Bd4 {[%emt 0:00:33]} 34. Rd1 {[%emt 0:00:03]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "7.5"]
[White "Yoo, Christopher Woojin"]
[Black "Nihal Sarin"]
[Result "1/2-1/2"]
[ECO "D23"]
[WhiteElo "2455"]
[BlackElo "2620"]
[Annotator "TA"]
[PlyCount "101"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,101,7,26,29,29,23,30,21,14,0,1,0,0,0,29,14,20,18,32,0,0,0,0,-31,-29,-28,-26,-39,0,0,0,0,0,0,0,0,0,0,0,0,8,8,8,-10,0,-10,-7,-8,-8,-20,0,-1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. d4 Nf6 2. Nf3 d5 3. c4 e6 4. Nc3 dxc4 5. Qa4+ Nbd7 6. e4 Be7 7. Bxc4 {D23: Queen's Gambit Accepted: 3 Nf3 Nf6 sidelines.} O-O 8. Qc2 c5 $1 {[%cal Rc5d4]} 9. e5 {White has an edge. is the legacy move (9.dxc5).} Nd5 {[%cal Rd5b4]} 10. Nxd5 exd5 11. Bd3 h6 12. O-O {[#]} cxd4 $146 ({Predecessor:} 12... c4 13. Bh7+ Kh8 14. Bf5 Nb8 15. Bxc8 Qxc8 16. Be3 Nc6 17. Ne1 Qe6 18. f4 f5 {0-1 (36) Cmilyte,V (2466)-Atalik,E (2374) Dresden 2007}) 13. Bf4 Nc5 14. Nxd4 Bd7 15. Bf5 Rc8 16. Bxd7 Qxd7 17. Qf5 Ne6 18. Rfd1 Rfd8 19. Be3 Nxd4 20. Qxd7 {The position is equal.} Rxd7 21. Bxd4 Bc5 22. Rac1 Rdc7 {[#] ...Bxd4 is the strong threat.} 23. Kf1 Bxd4 24. Rxc7 Rxc7 25. Rxd4 $11 {[%mdl 4096] Endgame KR-KR} Rc2 26. Rxd5 Rxb2 27. Rd7 a5 28. a4 Rb4 29. f3 b6 30. Rb7 Rxa4 {next ...Rb4 is good for Black.} 31. Rxb6 Ra2 32. Ra6 a4 33. Kg1 a3 34. h4 h5 (34... Kf8 {seems wilder.} 35. h5 Ra1+ 36. Kf2 a2 37. Kg3 Ke7) 35. Kh2 Re2 (35... Ra1 {is more complex.} 36. Ra8+ Kh7 37. Kg3 a2 38. Kf4 Kg6) 36. Rxa3 Rxe5 37. Kg3 g6 38. Rd3 Kg7 39. Kf2 Ra5 40. Re3 Ra2+ 41. Kg3 Ra4 42. Rd3 Rc4 43. Ra3 $1 Rb4 44. Re3 Ra4 45. Rc3 Rb4 46. Rc7 Ra4 47. Rd7 Rb4 48. Rc7 Ra4 49. Rb7 Rc4 50. Ra7 Rb4 51. Rc7 {Weighted Error Value: White=0.03/Black=0.04} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "7.6"]
[White "Shuvalova, Polina"]
[Black "Mammadzada, Gunay"]
[Result "1-0"]
[ECO "B90"]
[WhiteElo "2476"]
[BlackElo "2443"]
[Annotator "ChessBase"]
[PlyCount "187"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:00]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:02]} a6 {[%emt 0:00:04]} 6. a3 {[%emt 0:00:01]} e5 {[%emt 0:00:30]} 7. Nf5 {[%emt 0:00:04]} Bxf5 {[%emt 0:00:51]} 8. exf5 {[%emt 0:00:03]} d5 {[%emt 0:00:01]} 9. Bg5 {[%emt 0:00:05]} d4 {[%emt 0:00:02]} 10. Ne4 {[%emt 0:00:43]} Nbd7 {[%emt 0:01:38]} 11. Bd3 {[%emt 0:01:21]} Be7 {[%emt 0:01:14]} 12. Bxf6 {[%emt 0:00:09]} Nxf6 {[%emt 0:00:19]} 13. Nxf6+ {[%emt 0:00:56]} Bxf6 {[%emt 0:00:04]} 14. O-O {[%emt 0:00:06]} Qb6 {[%emt 0:00:10]} 15. Qf3 {[%emt 0:00:10]} O-O {[%emt 0:00:19]} 16. Be4 {[%emt 0:00:22]} Rac8 {[%emt 0:00:04]} 17. Rab1 {[%emt 0:00:37]} Rc7 {[%emt 0:00:18]} 18. g3 {[%emt 0:00:14]} Rfc8 {[%emt 0:00:05]} 19. h4 {[%emt 0:00:14]} Be7 {[%emt 0:01:01]} 20. Kg2 {[%emt 0:00:33]} Rb8 {[%emt 0:00:41]} 21. Rh1 {[%emt 0:00:09]} Qh6 {[%emt 0:00:02]} 22. Rbd1 {[%emt 0:00:07]} Qb6 {[%emt 0:01:02]} 23. Rb1 {[%emt 0:01:07]} Qh6 {[%emt 0:00:04]} 24. Rh3 {[%emt 0:00:10]} b5 {[%emt 0:00:39]} 25. g4 {[%emt 0:00:50]} Qd6 {[%emt 0:01:24]} 26. g5 {[%emt 0:00:09]} f6 {[%emt 0:00:02]} 27. Re1 {[%emt 0:01:21]} fxg5 {[%emt 0:00:48]} 28. f6 {[%emt 0:00:44]} Qxf6 {[%emt 0:00:27]} 29. Bxh7+ {[%emt 0:00:05]} Kh8 {[%emt 0:00:02]} 30. Qh5 {[%emt 0:01:09]} Qh6 {[%emt 0:00:11]} 31. hxg5 {[%emt 0:00:10]} Qxg5+ {[%emt 0:00:19]} 32. Qxg5 {[%emt 0:00:05]} Bxg5 {[%emt 0:00:00]} 33. Rxe5 {[%emt 0:00:25]} Bh6 {[%emt 0:00:01]} 34. Bd3 {[%emt 0:00:07]} Rc6 {[%emt 0:00:10]} 35. Rf3 {[%emt 0:00:06]} Kg8 {[%emt 0:00:09]} 36. Re7 {[%emt 0:00:07]} Rf6 {[%emt 0:00:12]} 37. Rxf6 {[%emt 0:00:05]} gxf6 {[%emt 0:00:00]} 38. Re6 {[%emt 0:00:01]} Bc1 {[%emt 0:00:02]} 39. Rxf6 {[%emt 0:00:17]} Ra8 {[%emt 0:00:12]} 40. b3 {[%emt 0:00:18]} Bxa3 {[%emt 0:00:02]} 41. f4 {[%emt 0:00:03]} Be7 {[%emt 0:00:03]} 42. Rb6 {[%emt 0:00:04]} Kf7 {[%emt 0:00:06]} 43. Kf3 {[%emt 0:00:01]} Bd8 {[%emt 0:00:04]} 44. Rd6 {[%emt 0:00:06]} Bf6 {[%emt 0:00:03]} 45. Ke4 {[%emt 0:00:01]} Ra7 {[%emt 0:00:04]} 46. Kf5 {[%emt 0:00:04]} Bg7 {[%emt 0:00:04]} 47. Rb6 {[%emt 0:00:03]} Kf8 {[%emt 0:00:04]} 48. Rb8+ {[%emt 0:00:02]} Kf7 {[%emt 0:00:04]} 49. Be4 {[%emt 0:00:02]} Ke7 {[%emt 0:00:11]} 50. Rb6 {[%emt 0:00:02]} Bf8 {[%emt 0:00:05]} 51. Bb7 {[%emt 0:00:06]} a5 {[%emt 0:00:03]} 52. Rxb5 {[%emt 0:00:04]} a4 {[%emt 0:00:00]} 53. bxa4 {[%emt 0:00:02]} Rxa4 {[%emt 0:00:04]} 54. Be4 {[%emt 0:00:07]} Ra1 {[%emt 0:00:12]} 55. Rb7+ {[%emt 0:00:03]} Kd8 {[%emt 0:00:06]} 56. Ke5 {[%emt 0:00:13]} Rf1 {[%emt 0:00:13]} 57. f5 {[%emt 0:00:07]} Be7 {[%emt 0:00:04]} 58. Kxd4 {[%emt 0:00:14]} Bf6+ {[%emt 0:00:04]} 59. Kd5 {[%emt 0:00:01]} Ra1 {[%emt 0:00:02]} 60. Ke6 {[%emt 0:00:09]} Ra6+ {[%emt 0:00:02]} 61. Kf7 {[%emt 0:00:02]} Bc3 {[%emt 0:00:01]} 62. Rb3 {[%emt 0:00:08]} Rf6+ {[%emt 0:00:04]} 63. Kg8 {[%emt 0:00:04]} Be5 {[%emt 0:00:03]} 64. Rb5 {[%emt 0:00:03]} Bc3 {[%emt 0:00:10]} 65. Rc5 {[%emt 0:00:06]} Ba1 {[%emt 0:00:05]} 66. Ra5 {[%emt 0:00:04]} Bc3 {[%emt 0:00:02]} 67. Ra7 {[%emt 0:00:03]} Ke8 {[%emt 0:00:08]} 68. Rc7 {[%emt 0:00:08]} Be5 {[%emt 0:00:06]} 69. Rc5 {[%emt 0:00:06]} Bd4 {[%emt 0:00:06]} 70. Rc4 {[%emt 0:00:03]} Be5 {[%emt 0:00:04]} 71. Rc5 {[%emt 0:00:03]} Bd4 {[%emt 0:00:01]} 72. Rd5 {[%emt 0:00:07]} Bc3 {[%emt 0:00:04]} 73. Rd3 {[%emt 0:00:01]} Be5 {[%emt 0:00:10]} 74. Kh7 {[%emt 0:00:09]} Bf4 {[%emt 0:00:06]} 75. Ra3 {[%emt 0:00:06]} Be5 {[%emt 0:00:12]} 76. Ra5 {[%emt 0:00:03]} Bc3 {[%emt 0:00:03]} 77. Ra8+ {[%emt 0:00:03]} Ke7 {[%emt 0:00:02]} 78. Ra7+ {[%emt 0:00:01]} Ke8 {[%emt 0:00:01]} 79. Rb7 {[%emt 0:00:11]} Rf7+ {[%emt 0:00:04]} 80. Kg6 {[%emt 0:00:10]} Rxb7 {[%emt 0:00:13]} 81. Bxb7 {[%emt 0:00:00]} Ke7 {[%emt 0:00:01]} 82. Be4 {[%emt 0:00:09]} Bf6 {[%emt 0:00:01]} 83. Bd3 {[%emt 0:00:02]} Bc3 {[%emt 0:00:03]} 84. Be4 {[%emt 0:00:02]} Bf6 {[%emt 0:00:10]} 85. c4 {[%emt 0:00:02]} Bd4 {[%emt 0:00:01]} 86. Bd5 {[%emt 0:00:01]} Bc5 {[%emt 0:00:14]} 87. f6+ {[%emt 0:00:03]} Kf8 {[%emt 0:00:01]} 88. Kf5 {[%emt 0:00:03]} Ke8 {[%emt 0:00:03]} 89. Ke6 {[%emt 0:00:02]} Kf8 {[%emt 0:00:06]} 90. Kd7 {[%emt 0:00:04]} Bd4 {[%emt 0:00:01]} 91. f7 {[%emt 0:00:04]} Kg7 {[%emt 0:00:13]} 92. Kd6 {[%emt 0:00:05]} Kf8 {[%emt 0:00:02]} 93. c5 {[%emt 0:00:05]} Be3 {[%emt 0:00:16]} 94. c6 {[%emt 0:00:03]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "7.7"]
[White "Bjerre, Jonas Buhl"]
[Black "Murzin, Volodar"]
[Result "1-0"]
[ECO "E97"]
[WhiteElo "2550"]
[BlackElo "2478"]
[Annotator "ChessBase"]
[PlyCount "97"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:00]} Bg7 {[%emt 0:00:00]} 4. e4 {[%emt 0:00:01]} O-O {[%emt 0:00:01]} 5. Nf3 {[%emt 0:00:02]} d6 {[%emt 0:00:02]} 6. Be2 {[%emt 0:00:01]} e5 {[%emt 0:00:02]} 7. O-O {[%emt 0:00:03]} Nc6 {[%emt 0:00:29]} 8. d5 {[%emt 0:00:01]} Ne7 {[%emt 0:00:03]} 9. Bg5 {[%emt 0:00:02]} h6 {[%emt 0:00:04]} 10. Bd2 {[%emt 0:00:03]} Nd7 {[%emt 0:00:56]} 11. Qc1 {[%emt 0:00:03]} Kh7 {[%emt 0:00:02]} 12. Qc2 {[%emt 0:00:06]} f5 {[%emt 0:00:13]} 13. exf5 {[%emt 0:00:11]} gxf5 {[%emt 0:00:08]} 14. Nh4 {[%emt 0:00:44]} a5 {[%emt 0:01:20]} 15. a3 {[%emt 0:00:38]} Kg8 {[%emt 0:00:42]} 16. g3 {[%emt 0:00:26]} Nf6 {[%emt 0:00:54]} 17. b4 {[%emt 0:00:15]} Qe8 {[%emt 0:00:36]} 18. Nb5 {[%emt 0:00:49]} Qd7 {[%emt 0:00:13]} 19. Rad1 {[%emt 0:01:25]} axb4 {[%emt 0:00:55]} 20. axb4 {[%emt 0:00:06]} f4 {[%emt 0:00:04]} 21. Bf3 {[%emt 0:01:09]} Nfxd5 {[%emt 0:01:07]} 22. cxd5 {[%emt 0:00:59]} Qxb5 {[%emt 0:00:03]} 23. Qxc7 {[%emt 0:00:04]} Nf5 {[%emt 0:00:03]} 24. Nxf5 {[%emt 0:00:37]} Bxf5 {[%emt 0:00:04]} 25. Qxd6 {[%emt 0:00:12]} Bd3 {[%emt 0:01:50]} 26. Bg2 {[%emt 0:01:19]} Bxf1 {[%emt 0:00:31]} 27. Bxf1 {[%emt 0:00:03]} Qa4 {[%emt 0:00:05]} 28. Rc1 {[%emt 0:00:13]} Rf7 {[%emt 0:01:19]} 29. Bh3 {[%emt 0:00:13]} Kh8 {[%emt 0:00:08]} 30. Be6 {[%emt 0:00:27]} Rff8 {[%emt 0:00:02]} 31. Qe7 {[%emt 0:00:29]} e4 {[%emt 0:00:29]} 32. Bxf4 {[%emt 0:00:36]} Rae8 {[%emt 0:00:07]} 33. Qc7 {[%emt 0:00:11]} Qa2 {[%emt 0:00:04]} 34. Be3 {[%emt 0:00:18]} Qe2 {[%emt 0:00:03]} 35. Qc2 {[%emt 0:00:11]} Qf3 {[%emt 0:00:04]} 36. Qd1 {[%emt 0:00:05]} Qf6 {[%emt 0:00:04]} 37. Qg4 {[%emt 0:00:09]} Qb2 {[%emt 0:00:04]} 38. Rc7 {[%emt 0:00:04]} Be5 {[%emt 0:00:10]} 39. Qxe4 {[%emt 0:00:24]} Qa1+ {[%emt 0:00:09]} 40. Rc1 {[%emt 0:00:05]} Qb2 {[%emt 0:00:01]} 41. Qg6 {[%emt 0:00:13]} Bg7 {[%emt 0:00:04]} 42. Rc7 {[%emt 0:00:07]} Ra8 {[%emt 0:00:07]} 43. Bf5 {[%emt 0:00:11]} Rxf5 {[%emt 0:00:04]} 44. Qxf5 {[%emt 0:00:01]} Rf8 {[%emt 0:00:04]} 45. Qg6 {[%emt 0:00:07]} Qe5 {[%emt 0:00:04]} 46. Rf7 {[%emt 0:00:12]} Ra8 {[%emt 0:00:03]} 47. Qe6 {[%emt 0:00:04]} Qh5 {[%emt 0:00:09]} 48. Kg2 {[%emt 0:00:04]} Rd8 {[%emt 0:00:11]} 49. d6 {[%emt 0:00:06]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "7.8"]
[White "Gukesh D"]
[Black "Abdusattorov, Nodirbek"]
[Result "0-1"]
[ECO "E04"]
[WhiteElo "2578"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "134"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,134,1,0,3,-12,-7,-7,-11,-58,-61,-73,-54,-75,-56,-78,-87,-64,-83,-85,-78,-64,-66,-94,-75,-67,-70,-77,-67,-72,-50,-138,-6,-49,-10,-32,-32,-46,-42,-37,-35,-55,-50,-81,-31,-19,-23,-144,-131,-207,-217,-213,-186,-192,-195,-347,-320,-390,-397,-402,-403,-443,-400,-553,-491,-1391,-1351,-1482,-1277,-1577,-1495,-1095,-1596,-1491,-1355,-1164,-1008,-1008,-992,-992,-931,-921,-813,-747,-735,-666,-592,-592,-36,-66,-87,-66,-66,-386,-381,-379,-378,-478,-425,-354,0,-8,-8,-280,-277,-535,-15,-1114,-1114,-29968,-29970,-29967,-7092,-29980,-29981,-29979,-29976,-29983,-29984,-29983,-29984,-29988,-29989,-29991,-29992,-29992,-29993]} 1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. g3 Bb4+ 5. Nbd2 dxc4 6. Bg2 b5 {E04: Open Catalan: 5 Nf3.} 7. a4 c6 8. O-O a5 {The position is equal.} 9. Ne1 Ra7 (9... Qxd4 10. axb5 Bb7 11. Nc2 $11) 10. Nc2 Be7 11. e4 O-O 12. e5 Nd5 13. Ne4 Nd7 {[%cal Bb8d7,Bd7f6,Bf6g4][%mdl 32] [#]} 14. h4 $146 ({Predecessor:} 14. Qg4 f5 15. exf6 N7xf6 16. Qe2 Nxe4 17. Qxe4 Bf6 18. Re1 Qb6 19. Bh3 Re7 20. Bd2 b4 21. Be3 b3 22. Na3 c3 23. Rab1 Qb4 {0-1 (23) Praczukowski,S (2166)-Krishna Teja,N (2368) Warsaw 2019}) 14... f6 15. exf6 N7xf6 16. Ng5 h6 17. Nf3 Ng4 18. Qe2 Qe8 19. Nd2 h5 20. Ne4 (20. Nf3 $15) 20... Qg6 (20... b4 $1 $17 21. f3 Ngf6) 21. Ne3 Nb4 22. axb5 cxb5 23. Nc3 $1 Nxe3 24. Bxe3 Bd7 25. d5 Ra6 26. Rad1 exd5 27. Nxd5 Nxd5 28. Bxd5+ (28. Rxd5 $11 {keeps the balance.} Bc6 29. Rfd1) 28... Kh8 $17 29. Bf3 (29. Bf4 $17 {might work better.} Bc5 30. Be4) 29... Bg4 $1 $19 30. Bxg4 Qxg4 ({Don't play} 30... hxg4 31. Rd7 $17) 31. Qxg4 hxg4 32. Rd7 $2 (32. Rd5 b4 33. Bc5 Bxc5 34. Rxc5) 32... Bf6 $1 33. Bd4 Rd8 34. Rxd8+ Bxd8 {[%mdl 4096] Endgame KRB-KRB} 35. Re1 {And now Re8+ would win.} Rd6 36. Re4 a4 37. Rxg4 (37. Kg2 $142 Kh7 38. Be5) 37... Bf6 38. Bxf6 gxf6 {KR-KR} 39. Rf4 Rd2 40. Rxf6 Rxb2 41. Kg2 a3 42. Ra6 a2 {Threatens to win with ...c3.} 43. Ra8+ Kg7 44. Ra7+ Kf6 {White must now prevent ...c3.} 45. Ra6+ Kf7 46. Ra7+ Kg6 47. Ra6+ Kf5 {aiming for ...c3.} 48. h5 Kg5 ({Black should play} 48... Rd2 $19 49. h6 c3) 49. h6 a1=Q $1 {[%cal Ra1a6]} 50. Rxa1 {h7 would kill now.} Kxh6 51. Ra6+ $2 {[%mdl 8192]} (51. Rc1 $1 $15) 51... Kg5 52. Rc6 Kf5 $1 {[%cal Rf5e4]} 53. Kf3 Rb3+ 54. Ke2 c3 $2 ({Better is} 54... Ke4 $19 {...Rb2+ is the strong threat.} 55. Kd1 Rb2) 55. Kd3 $11 b4 {Threatening ...Rb1.} 56. Rc5+ $2 {[%mdl 8192] [#]} (56. f4 $1 $11 {and White stays safe.}) 56... Ke6 $1 $19 57. g4 $2 {[#]} (57. f4 {was worth a try.} Rb2 58. g4) 57... Rb2 $2 (57... Kd6 $1 $19 {[%cal Rd6c5]} 58. Rc4 Rb2) 58. Rc4 {[%mdl 8192]} (58. f4 $11) 58... Kd5 59. Rd4+ Kc5 60. Rc4+ Kb5 {( -> ...Rd2+)} 61. Rf4 Rd2+ {Black mates.} 62. Ke3 b3 63. Rf8 b2 64. Rb8+ Kc4 65. g5 Rd5 66. g6 c2 67. Rc8+ Rc5 {Weighted Error Value: White=0.73/Black=0.43} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "7.9"]
[White "Keymer, Vincent"]
[Black "Khademalsharieh, Sarasadat"]
[Result "1/2-1/2"]
[ECO "D32"]
[WhiteElo "2591"]
[BlackElo "2494"]
[Annotator "ChessBase"]
[PlyCount "129"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. e3 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 3. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 4. Nc3 {[%emt 0:00:00]} c5 {[%emt 0:00:02]} 5. cxd5 {[%emt 0:00:00]} exd5 {[%emt 0:00:02]} 6. d4 {[%emt 0:00:02]} Nc6 {[%emt 0:00:04]} 7. Bb5 {[%emt 0:00:01]} Bd6 {[%emt 0:00:13]} 8. dxc5 {[%emt 0:00:01]} Bxc5 {[%emt 0:00:02]} 9. O-O {[%emt 0:00:03]} O-O {[%emt 0:00:02]} 10. b3 {[%emt 0:00:08]} Bg4 {[%emt 0:00:10]} 11. Bb2 {[%emt 0:00:11]} a6 {[%emt 0:00:45]} 12. Bxc6 {[%emt 0:00:02]} bxc6 {[%emt 0:00:01]} 13. h3 {[%emt 0:00:13]} Bd7 {[%emt 0:00:48]} 14. Na4 {[%emt 0:00:36]} Bd6 {[%emt 0:00:01]} 15. Qd4 {[%emt 0:00:13]} Rb8 {[%emt 0:00:15]} 16. Nc5 {[%emt 0:00:36]} Re8 {[%emt 0:00:21]} 17. Rac1 {[%emt 0:00:33]} Rb5 {[%emt 0:00:50]} 18. Rfd1 {[%emt 0:02:08]} Bc8 {[%emt 0:00:33]} 19. Nd3 {[%emt 0:00:47]} Bd7 {[%emt 0:00:39]} 20. Nde5 {[%emt 0:01:08]} c5 {[%emt 0:01:01]} 21. Qd2 {[%emt 0:00:49]} Be6 {[%emt 0:01:23]} 22. Qc2 {[%emt 0:00:03]} Ne4 {[%emt 0:00:15]} 23. Nd3 {[%emt 0:00:35]} Qa5 {[%emt 0:00:45]} 24. a3 {[%emt 0:00:28]} Rc8 {[%emt 0:00:49]} 25. Nf4 {[%emt 0:00:38]} Bxf4 {[%emt 0:00:21]} 26. exf4 {[%emt 0:00:00]} Qb6 {[%emt 0:00:27]} 27. b4 {[%emt 0:00:23]} Qb7 {[%emt 0:00:33]} 28. Qe2 {[%emt 0:00:27]} a5 {[%emt 0:00:18]} 29. f5 {[%emt 0:00:24]} Bxf5 {[%emt 0:00:03]} 30. Rxd5 {[%emt 0:00:04]} Qxd5 {[%emt 0:00:22]} 31. Qxb5 {[%emt 0:00:02]} axb4 {[%emt 0:00:01]} 32. axb4 {[%emt 0:00:02]} Nd6 {[%emt 0:00:27]} 33. Rxc5 {[%emt 0:00:26]} Qd1+ {[%emt 0:00:12]} 34. Qf1 {[%emt 0:00:01]} Qb3 {[%emt 0:00:11]} 35. Be5 {[%emt 0:00:14]} Qxb4 {[%emt 0:00:12]} 36. Rd5 {[%emt 0:00:33]} Nc4 {[%emt 0:00:26]} 37. Bxg7 {[%emt 0:00:13]} Be4 {[%emt 0:00:24]} 38. Rg5 {[%emt 0:00:05]} Bg6 {[%emt 0:00:01]} 39. Bd4 {[%emt 0:00:31]} Nd2 {[%emt 0:00:01]} 40. Nxd2 {[%emt 0:00:01]} Qxd2 {[%emt 0:00:01]} 41. Be3 {[%emt 0:00:01]} Qd6 {[%emt 0:00:02]} 42. h4 {[%emt 0:00:05]} h6 {[%emt 0:00:03]} 43. Rg3 {[%emt 0:00:03]} Kh7 {[%emt 0:00:01]} 44. h5 {[%emt 0:00:21]} Bxh5 {[%emt 0:00:04]} 45. Rh3 {[%emt 0:00:01]} Qd1 {[%emt 0:00:25]} 46. Qxd1 {[%emt 0:00:19]} Bxd1 {[%emt 0:00:01]} 47. Rxh6+ {[%emt 0:00:00]} Kg7 {[%emt 0:00:01]} 48. Rd6 {[%emt 0:00:04]} Bb3 {[%emt 0:00:02]} 49. Bd4+ {[%emt 0:00:02]} Kh7 {[%emt 0:00:01]} 50. Rf6 {[%emt 0:00:14]} Be6 {[%emt 0:00:01]} 51. Rf4 {[%emt 0:00:03]} Rc4 {[%emt 0:00:10]} 52. f3 {[%emt 0:00:07]} Ra4 {[%emt 0:00:03]} 53. Kf2 {[%emt 0:00:06]} Kg6 {[%emt 0:00:02]} 54. Rf6+ {[%emt 0:00:08]} Kh7 {[%emt 0:00:01]} 55. Ke3 {[%emt 0:00:07]} Ra5 {[%emt 0:00:06]} 56. g4 {[%emt 0:00:03]} Ra3+ {[%emt 0:00:04]} 57. Ke4 {[%emt 0:00:04]} Ra2 {[%emt 0:00:05]} 58. g5 {[%emt 0:00:08]} Rh2 {[%emt 0:00:03]} 59. Ke5 {[%emt 0:00:09]} Rh5 {[%emt 0:00:04]} 60. f4 {[%emt 0:00:03]} Kg8 {[%emt 0:00:03]} 61. f5 {[%emt 0:00:09]} Rxg5 {[%emt 0:00:03]} 62. Kf4 {[%emt 0:00:01]} Rxf5+ {[%emt 0:00:02]} 63. Rxf5 {[%emt 0:00:01]} Bxf5 {[%emt 0:00:00]} 64. Kxf5 {[%emt 0:00:00]} f6 {[%emt 0:00:02]} 65. Kxf6 {[%emt 0:00:00]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "7.10"]
[White "Mendonca, Leon Luke"]
[Black "Abdumalik, Zhansaya"]
[Result "1/2-1/2"]
[ECO "D93"]
[WhiteElo "2549"]
[BlackElo "2472"]
[Annotator "ChessBase"]
[PlyCount "129"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:04]} d5 {[%emt 0:00:00]} 4. Bf4 {[%emt 0:00:06]} Bg7 {[%emt 0:00:00]} 5. e3 {[%emt 0:00:05]} c6 {[%emt 0:00:26]} 6. Nf3 {[%emt 0:00:39]} O-O {[%emt 0:00:06]} 7. Bd3 {[%emt 0:00:52]} Be6 {[%emt 0:00:22]} 8. c5 {[%emt 0:00:44]} Nh5 {[%emt 0:00:09]} 9. Be5 {[%emt 0:01:26]} f6 {[%emt 0:00:23]} 10. Bxb8 {[%emt 0:00:52]} Rxb8 {[%emt 0:00:12]} 11. O-O {[%emt 0:01:54]} f5 {[%emt 0:01:18]} 12. b4 {[%emt 0:01:33]} Nf6 {[%emt 0:00:51]} 13. Ne5 {[%emt 0:00:47]} Ne4 {[%emt 0:00:13]} 14. Ne2 {[%emt 0:00:11]} Qc7 {[%emt 0:00:38]} 15. f4 {[%emt 0:00:12]} b6 {[%emt 0:00:58]} 16. Qc2 {[%emt 0:00:29]} bxc5 {[%emt 0:01:06]} 17. bxc5 {[%emt 0:00:00]} Rb4 {[%emt 0:00:43]} 18. Rab1 {[%emt 0:00:29]} Rfb8 {[%emt 0:00:03]} 19. Rxb4 {[%emt 0:00:07]} Rxb4 {[%emt 0:00:01]} 20. Rb1 {[%emt 0:00:44]} Rxb1+ {[%emt 0:00:15]} 21. Qxb1 {[%emt 0:00:00]} Bxe5 {[%emt 0:00:01]} 22. fxe5 {[%emt 0:00:00]} Bc8 {[%emt 0:00:13]} 23. Qb4 {[%emt 0:00:08]} Kf7 {[%emt 0:00:37]} 24. g3 {[%emt 0:00:04]} Ng5 {[%emt 0:00:15]} 25. Kg2 {[%emt 0:00:04]} Qb7 {[%emt 0:00:07]} 26. a3 {[%emt 0:00:21]} Ne6 {[%emt 0:00:26]} 27. Nc1 {[%emt 0:00:06]} Qxb4 {[%emt 0:00:24]} 28. axb4 {[%emt 0:00:02]} Nc7 {[%emt 0:00:00]} 29. Kf3 {[%emt 0:00:12]} Bb7 {[%emt 0:01:05]} 30. Nb3 {[%emt 0:00:03]} Ba6 {[%emt 0:00:09]} 31. Ke2 {[%emt 0:00:09]} Ke8 {[%emt 0:00:03]} 32. Na5 {[%emt 0:00:05]} Bxd3+ {[%emt 0:00:13]} 33. Kxd3 {[%emt 0:00:00]} Kd7 {[%emt 0:00:00]} 34. Nb3 {[%emt 0:00:04]} g5 {[%emt 0:00:15]} 35. Nd2 {[%emt 0:00:04]} h6 {[%emt 0:00:12]} 36. Nf3 {[%emt 0:00:11]} Ne6 {[%emt 0:00:03]} 37. Ne1 {[%emt 0:00:07]} Nc7 {[%emt 0:00:05]} 38. Nf3 {[%emt 0:00:03]} Ne6 {[%emt 0:00:01]} 39. Nd2 {[%emt 0:00:05]} g4 {[%emt 0:00:06]} 40. Nb1 {[%emt 0:00:06]} Ng5 {[%emt 0:00:03]} 41. Nd2 {[%emt 0:00:03]} Kc7 {[%emt 0:00:05]} 42. Ke2 {[%emt 0:00:12]} Kb7 {[%emt 0:00:01]} 43. Nb1 {[%emt 0:00:02]} Ne4 {[%emt 0:00:09]} 44. Kd3 {[%emt 0:00:06]} h5 {[%emt 0:00:05]} 45. Na3 {[%emt 0:00:04]} Ka6 {[%emt 0:00:17]} 46. Ke2 {[%emt 0:00:08]} Ng5 {[%emt 0:00:04]} 47. Kf2 {[%emt 0:00:06]} Nf3 {[%emt 0:00:23]} 48. Kg2 {[%emt 0:00:06]} Nd2 {[%emt 0:00:04]} 49. Kf2 {[%emt 0:00:02]} Nc4 {[%emt 0:00:12]} 50. Nc2 {[%emt 0:00:02]} Kb5 {[%emt 0:00:02]} 51. Ke2 {[%emt 0:00:01]} Ka4 {[%emt 0:00:18]} 52. Kd3 {[%emt 0:00:02]} a6 {[%emt 0:00:02]} 53. Kc3 {[%emt 0:00:03]} e6 {[%emt 0:00:04]} 54. Kd3 {[%emt 0:00:13]} Kb3 {[%emt 0:00:02]} 55. Ne1 {[%emt 0:00:01]} Kxb4 {[%emt 0:00:03]} 56. Ng2 {[%emt 0:00:02]} Kb3 {[%emt 0:00:16]} 57. Nf4 {[%emt 0:00:03]} a5 {[%emt 0:00:00]} 58. Nxe6 {[%emt 0:00:01]} a4 {[%emt 0:00:01]} 59. Nf4 {[%emt 0:00:14]} Nb2+ {[%emt 0:00:16]} 60. Kd2 {[%emt 0:00:02]} a3 {[%emt 0:00:07]} 61. Ne2 {[%emt 0:00:03]} Nc4+ {[%emt 0:00:00]} 62. Kd3 {[%emt 0:00:02]} Nb2+ {[%emt 0:00:02]} 63. Kd2 {[%emt 0:00:01]} Nc4+ {[%emt 0:00:00]} 64. Kd3 {[%emt 0:00:11]} Nb2+ {[%emt 0:00:17]} 65. Kd2 {[%emt 0:00:01]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "8.1"]
[White "Zhu, Jiner"]
[Black "Abdumalik, Zhansaya"]
[Result "1-0"]
[ECO "C91"]
[WhiteElo "2459"]
[BlackElo "2472"]
[Annotator "ChessBase"]
[PlyCount "75"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 4. Ba4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. O-O {[%emt 0:00:01]} Be7 {[%emt 0:00:00]} 6. Re1 {[%emt 0:00:06]} b5 {[%emt 0:00:00]} 7. Bb3 {[%emt 0:00:01]} O-O {[%emt 0:00:00]} 8. d4 {[%emt 0:00:01]} d6 {[%emt 0:00:06]} 9. c3 {[%emt 0:00:02]} Bg4 {[%emt 0:00:05]} 10. d5 {[%emt 0:00:03]} Na5 {[%emt 0:00:08]} 11. Bc2 {[%emt 0:00:01]} c5 {[%emt 0:00:20]} 12. h3 {[%emt 0:00:30]} Bd7 {[%emt 0:00:28]} 13. b3 {[%emt 0:00:18]} Re8 {[%emt 0:00:05]} 14. Be3 {[%emt 0:00:04]} Bf8 {[%emt 0:00:21]} 15. Nbd2 {[%emt 0:00:03]} g6 {[%emt 0:00:09]} 16. Nf1 {[%emt 0:00:06]} Nh5 {[%emt 0:00:02]} 17. Qd2 {[%emt 0:03:01]} Bg7 {[%emt 0:00:08]} 18. Ng3 {[%emt 0:00:25]} Nf4 {[%emt 0:01:11]} 19. Ne2 {[%emt 0:00:16]} Qf6 {[%emt 0:00:10]} 20. Nxf4 {[%emt 0:00:55]} exf4 {[%emt 0:00:06]} 21. Bxf4 {[%emt 0:00:00]} Qxc3 {[%emt 0:00:04]} 22. e5 {[%emt 0:01:08]} Qxd2 {[%emt 0:00:27]} 23. Bxd2 {[%emt 0:00:01]} Nb7 {[%emt 0:00:02]} 24. Bf4 {[%emt 0:00:01]} c4 {[%emt 0:01:22]} 25. Rad1 {[%emt 0:01:17]} a5 {[%emt 0:01:20]} 26. exd6 {[%emt 0:00:44]} cxb3 {[%emt 0:00:03]} 27. axb3 {[%emt 0:00:25]} Rac8 {[%emt 0:00:20]} 28. Bb1 {[%emt 0:00:21]} Nc5 {[%emt 0:00:31]} 29. Rxe8+ {[%emt 0:01:00]} Rxe8 {[%emt 0:00:28]} 30. Rc1 {[%emt 0:00:07]} Rc8 {[%emt 0:00:29]} 31. Nd2 {[%emt 0:00:18]} a4 {[%emt 0:00:09]} 32. bxa4 {[%emt 0:00:26]} Nxa4 {[%emt 0:00:16]} 33. Rc7 {[%emt 0:00:17]} Rxc7 {[%emt 0:00:01]} 34. dxc7 {[%emt 0:00:01]} Nc3 {[%emt 0:00:00]} 35. Bd3 {[%emt 0:00:04]} b4 {[%emt 0:00:29]} 36. d6 {[%emt 0:00:06]} Nd5 {[%emt 0:00:08]} 37. Bb5 {[%emt 0:00:14]} Be6 {[%emt 0:00:43]} 38. d7 {[%emt 0:00:07]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "8.2"]
[White "Khademalsharieh, Sarasadat"]
[Black "Mendonca, Leon Luke"]
[Result "0-1"]
[ECO "D12"]
[WhiteElo "2494"]
[BlackElo "2549"]
[Annotator "ChessBase"]
[PlyCount "100"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:09]} d5 {[%emt 0:00:04]} 4. e3 {[%emt 0:00:01]} Bf5 {[%emt 0:00:04]} 5. Nc3 {[%emt 0:00:03]} e6 {[%emt 0:00:02]} 6. Nh4 {[%emt 0:00:01]} Be4 {[%emt 0:00:02]} 7. f3 {[%emt 0:00:05]} Bg6 {[%emt 0:00:02]} 8. Qb3 {[%emt 0:00:01]} Qc7 {[%emt 0:00:03]} 9. Bd2 {[%emt 0:00:03]} Be7 {[%emt 0:00:03]} 10. Nxg6 {[%emt 0:00:03]} hxg6 {[%emt 0:00:02]} 11. O-O-O {[%emt 0:00:09]} dxc4 {[%emt 0:01:43]} 12. Bxc4 {[%emt 0:00:03]} b5 {[%emt 0:00:02]} 13. Bd3 {[%emt 0:00:41]} a6 {[%emt 0:00:15]} 14. h3 {[%emt 0:00:21]} Nbd7 {[%emt 0:00:14]} 15. Ne4 {[%emt 0:00:28]} c5 {[%emt 0:00:46]} 16. Nxf6+ {[%emt 0:01:27]} Bxf6 {[%emt 0:00:55]} 17. Kb1 {[%emt 0:00:44]} O-O {[%emt 0:01:25]} 18. Be4 {[%emt 0:01:42]} Rac8 {[%emt 0:00:15]} 19. h4 {[%emt 0:01:00]} cxd4 {[%emt 0:01:11]} 20. exd4 {[%emt 0:01:05]} Bxd4 {[%emt 0:00:35]} 21. h5 {[%emt 0:00:09]} Nc5 {[%emt 0:00:13]} 22. Qc2 {[%emt 0:00:01]} f5 {[%emt 0:01:02]} 23. Bb4 {[%emt 0:00:42]} Rfd8 {[%emt 0:00:40]} 24. Bd3 {[%emt 0:02:13]} gxh5 {[%emt 0:00:37]} 25. Bxc5 {[%emt 0:00:09]} Qxc5 {[%emt 0:00:18]} 26. Qe2 {[%emt 0:00:07]} Qe5 {[%emt 0:00:22]} 27. Rxh5 {[%emt 0:00:10]} Qxe2 {[%emt 0:00:19]} 28. Bxe2 {[%emt 0:00:02]} Kf7 {[%emt 0:00:10]} 29. g4 {[%emt 0:00:09]} g6 {[%emt 0:00:25]} 30. Rh7+ {[%emt 0:00:05]} Bg7 {[%emt 0:00:02]} 31. gxf5 {[%emt 0:00:06]} exf5 {[%emt 0:00:13]} 32. Rhh1 {[%emt 0:00:02]} Be5 {[%emt 0:00:06]} 33. Bd3 {[%emt 0:00:01]} Kf6 {[%emt 0:00:02]} 34. Bc2 {[%emt 0:00:06]} Rh8 {[%emt 0:00:10]} 35. a4 {[%emt 0:00:12]} bxa4 {[%emt 0:00:21]} 36. Bxa4 {[%emt 0:00:03]} Rb8 {[%emt 0:00:05]} 37. b3 {[%emt 0:00:02]} Rxh1 {[%emt 0:00:05]} 38. Rxh1 {[%emt 0:00:01]} Rd8 {[%emt 0:00:00]} 39. Kc2 {[%emt 0:00:02]} Rc8+ {[%emt 0:00:03]} 40. Kd2 {[%emt 0:00:01]} Bf4+ {[%emt 0:00:11]} 41. Kd3 {[%emt 0:00:08]} Rd8+ {[%emt 0:00:02]} 42. Ke2 {[%emt 0:00:02]} Rd2+ {[%emt 0:00:01]} 43. Ke1 {[%emt 0:00:04]} Rc2 {[%emt 0:00:08]} 44. Rh8 {[%emt 0:00:03]} Kg5 {[%emt 0:00:14]} 45. Ra8 {[%emt 0:00:08]} Kh4 {[%emt 0:00:03]} 46. Rxa6 {[%emt 0:00:04]} g5 {[%emt 0:00:01]} 47. Rc6 {[%emt 0:00:04]} Rb2 {[%emt 0:00:03]} 48. Rc5 {[%emt 0:00:11]} Kg3 {[%emt 0:00:02]} 49. Rxf5 {[%emt 0:00:04]} Kxf3 {[%emt 0:00:01]} 50. Rc5 {[%emt 0:00:09]} Rb1+ {[%emt 0:00:05]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "8.3"]
[White "Abdusattorov, Nodirbek"]
[Black "Keymer, Vincent"]
[Result "1-0"]
[ECO "B50"]
[WhiteElo "2627"]
[BlackElo "2591"]
[Annotator "TA"]
[PlyCount "69"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,68,0,-3,0,0,-7,-12,-4,18,29,32,25,25,-1,4,0,0,0,0,0,0,0,20,0,0,-6,0,-22,-22,-20,-6,0,121,87,98,100,186,179,146,7,21,1,7,5,61,71,75,1,49,54,1123,1081,29996,29997,29997,29998,29998,29999,29999]} 1. e4 c5 2. Nf3 d6 3. Nc3 Nf6 4. e5 dxe5 5. Nxe5 a6 6. a4 Qc7 {6...Nbd7 deserves study.} 7. d4 {B50: Sicilian: 2...d6, Miscellaneous.} e6 8. Bf4 Bd6 9. Bg3 {The position is equal.} Nbd7 {[%cal Rd7e5]} 10. Nc4 Bxg3 11. hxg3 O-O 12. Qd3 {[#]} h6 $146 ({Predecessor:} 12... Rd8 13. dxc5 Nxc5 14. Qe3 Nd5 15. Qf3 Nb4 16. Ne3 Qe5 17. Be2 f5 18. Qh5 h6 {1-0 (26) Djuric,S (2460)-Bruned,B (2227) Metz 2008}) 13. a5 b5 14. axb6 $1 Nxb6 15. dxc5 Nxc4 16. Qxc4 Rb8 17. Bd3 Rxb2 18. O-O Bb7 19. Na4 (19. Qd4 {is more complex.} Qd7 20. Qd6 Rd8 21. Rfb1 Rxb1+ 22. Rxb1 Bc6 23. Bxa6 Qxd6 24. cxd6 Rxd6 25. Rb8+) 19... Rb5 20. Qc3 Ra5 {Strongly threatening ...Rxa4!} (20... Nd5 {with more complications.} 21. Qd2 Ra5 22. Rfb1 Bc6 23. Nc3 Rxa1 24. Rxa1 Nb4) 21. Rfb1 $1 {[%cal Rb1b7]} Bxg2 22. Kxg2 {Black must now prevent Rb6.} Rxa4 {[%mdl 64] Decoy} 23. Rxa4 ({Not} 23. Bh7+ $2 Kxh7 24. Rxa4 Qc6+ 25. Qf3 Qxa4 $19) 23... Qc6+ 24. Kg1 $1 Qxa4 25. Ra1 (25. c6 $1 $16 {[%cal Rc6c7]}) 25... Qg4 26. c6 {c7 is the strong threat.} Nd5 27. Qe5 Rc8 (27... Qg5 $1 $11 28. Qe4 g6) 28. Rxa6 $14 {Hoping for c7!} Nb4 {[#]} 29. Rb6 $40 {[%mdl 128] White has some attack.} (29. Qc7 $1 $16 {[%cal Rc7c8]} e5 30. Qb7 (30. Qd7 Qxd7 31. cxd7 Rd8 $17) 30... Nxa6 31. Bxa6 Qd1+ 32. Kh2) 29... Qd1+ ({Wrong is} 29... Nxc6 $2 {[#]} 30. Rxc6 $1 {[%mdl 512]} Rf8 31. Rd6 $18) 30. Kg2 Nxc2 {[%mdl 8192] [#] This costs Black the game.} (30... Nxd3 $14 31. cxd3 Qc2) 31. Rb8 $1 $18 {[%cal Rb8c8]} Rf8 (31... Ne3+ 32. fxe3) 32. Rxf8+ {[%mdl 64] Back Rank. White mates.} Kxf8 33. Qd6+ Ke8 34. Qd7+ Kf8 35. Qd8# {Weighted Error Value: White=0.21/Black=0.43} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "8.4"]
[White "Murzin, Volodar"]
[Black "Gukesh D"]
[Result "0-1"]
[ECO "C70"]
[WhiteElo "2478"]
[BlackElo "2578"]
[Annotator "ChessBase"]
[PlyCount "122"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:02]} a6 {[%emt 0:00:00]} 4. Ba4 {[%emt 0:00:02]} Bc5 {[%emt 0:00:00]} 5. O-O {[%emt 0:00:05]} Nge7 {[%emt 0:00:05]} 6. Nxe5 {[%emt 0:01:02]} Nxe5 {[%emt 0:00:03]} 7. d4 {[%emt 0:00:03]} b5 {[%emt 0:00:02]} 8. Bb3 {[%emt 0:00:01]} Bxd4 {[%emt 0:00:05]} 9. Qxd4 {[%emt 0:00:03]} d6 {[%emt 0:00:02]} 10. Qe3 {[%emt 0:00:25]} c5 {[%emt 0:01:15]} 11. c3 {[%emt 0:00:15]} Be6 {[%emt 0:01:11]} 12. Bc2 {[%emt 0:00:17]} O-O {[%emt 0:00:43]} 13. Nd2 {[%emt 0:01:21]} f5 {[%emt 0:00:23]} 14. f4 {[%emt 0:00:16]} N5g6 {[%emt 0:01:36]} 15. Nf3 {[%emt 0:00:24]} fxe4 {[%emt 0:00:55]} 16. Bxe4 {[%emt 0:00:05]} Nd5 {[%emt 0:00:14]} 17. Qe1 {[%emt 0:00:44]} Ngxf4 {[%emt 0:01:46]} 18. Bxf4 {[%emt 0:02:05]} Nxf4 {[%emt 0:00:01]} 19. Bxa8 {[%emt 0:00:06]} Qxa8 {[%emt 0:00:05]} 20. Qd2 {[%emt 0:00:51]} Bc4 {[%emt 0:01:18]} 21. Qxd6 {[%emt 0:00:37]} Rf6 {[%emt 0:00:45]} 22. Qd2 {[%emt 0:00:18]} Bxf1 {[%emt 0:00:25]} 23. Rxf1 {[%emt 0:00:03]} Qf8 {[%emt 0:00:05]} 24. Kh1 {[%emt 0:01:13]} c4 {[%emt 0:00:15]} 25. b3 {[%emt 0:00:26]} Nd3 {[%emt 0:00:11]} 26. bxc4 {[%emt 0:00:07]} bxc4 {[%emt 0:00:02]} 27. Qe3 {[%emt 0:00:09]} h6 {[%emt 0:00:12]} 28. h3 {[%emt 0:00:24]} Qf7 {[%emt 0:00:09]} 29. Qd4 {[%emt 0:00:27]} Rf4 {[%emt 0:00:11]} 30. Qd6 {[%emt 0:00:11]} Rf6 {[%emt 0:00:08]} 31. Qd4 {[%emt 0:00:02]} Qe6 {[%emt 0:00:04]} 32. Qd8+ {[%emt 0:00:26]} Kh7 {[%emt 0:00:04]} 33. Qd4 {[%emt 0:00:03]} Qe2 {[%emt 0:00:03]} 34. Kg1 {[%emt 0:00:07]} Rf4 {[%emt 0:00:17]} 35. Qd5 {[%emt 0:00:06]} Qe3+ {[%emt 0:00:02]} 36. Kh2 {[%emt 0:00:03]} Ne5 {[%emt 0:00:08]} 37. Qb7 {[%emt 0:00:06]} Qxc3 {[%emt 0:00:05]} 38. Nxe5 {[%emt 0:00:07]} Qxe5 {[%emt 0:00:09]} 39. Rxf4 {[%emt 0:00:01]} Qxf4+ {[%emt 0:00:01]} 40. Kh1 {[%emt 0:00:01]} Qc1+ {[%emt 0:00:01]} 41. Kh2 {[%emt 0:00:02]} Qf4+ {[%emt 0:00:02]} 42. Kh1 {[%emt 0:00:01]} c3 {[%emt 0:00:10]} 43. Qc6 {[%emt 0:00:05]} Qc1+ {[%emt 0:00:06]} 44. Kh2 {[%emt 0:00:01]} Qf4+ {[%emt 0:00:01]} 45. Kh1 {[%emt 0:00:01]} Qe5 {[%emt 0:00:03]} 46. Qc4 {[%emt 0:00:08]} Qe1+ {[%emt 0:00:06]} 47. Kh2 {[%emt 0:00:01]} Qe5+ {[%emt 0:00:01]} 48. Kh1 {[%emt 0:00:01]} a5 {[%emt 0:00:12]} 49. Qd3+ {[%emt 0:00:13]} Kg8 {[%emt 0:00:01]} 50. Qd8+ {[%emt 0:00:04]} Kf7 {[%emt 0:00:02]} 51. Qd7+ {[%emt 0:00:01]} Kf6 {[%emt 0:00:00]} 52. Qc6+ {[%emt 0:00:04]} Kg5 {[%emt 0:00:03]} 53. Qc4 {[%emt 0:00:02]} Qe1+ {[%emt 0:00:03]} 54. Kh2 {[%emt 0:00:01]} Qe5+ {[%emt 0:00:01]} 55. Kh1 {[%emt 0:00:01]} h5 {[%emt 0:00:01]} 56. a4 {[%emt 0:00:04]} g6 {[%emt 0:00:16]} 57. Qc6 {[%emt 0:00:33]} Qe1+ {[%emt 0:00:04]} 58. Kh2 {[%emt 0:00:01]} Qe5+ {[%emt 0:00:00]} 59. Kh1 {[%emt 0:00:02]} Qe3 {[%emt 0:00:15]} 60. Qc7 {[%emt 0:00:21]} Qc1+ {[%emt 0:00:03]} 61. Kh2 {[%emt 0:00:04]} Qf4+ {[%emt 0:00:00]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "8.5"]
[White "Mammadzada, Gunay"]
[Black "Bjerre, Jonas Buhl"]
[Result "1/2-1/2"]
[ECO "B90"]
[WhiteElo "2443"]
[BlackElo "2550"]
[Annotator "ChessBase"]
[PlyCount "199"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:00]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 6. Be3 {[%emt 0:00:00]} e5 {[%emt 0:00:01]} 7. Nb3 {[%emt 0:00:02]} Be7 {[%emt 0:00:01]} 8. Qd2 {[%emt 0:00:07]} Ng4 {[%emt 0:00:02]} 9. g3 {[%emt 0:00:05]} Be6 {[%emt 0:00:16]} 10. O-O-O {[%emt 0:00:06]} Nxe3 {[%emt 0:00:06]} 11. Qxe3 {[%emt 0:00:08]} Nd7 {[%emt 0:00:03]} 12. f4 {[%emt 0:00:11]} b5 {[%emt 0:00:08]} 13. Kb1 {[%emt 0:02:20]} Qb6 {[%emt 0:00:03]} 14. Qxb6 {[%emt 0:00:49]} Nxb6 {[%emt 0:00:04]} 15. Na5 {[%emt 0:00:01]} Rc8 {[%emt 0:02:08]} 16. Nb7 {[%emt 0:01:12]} Rc6 {[%emt 0:02:34]} 17. Nxb5 {[%emt 0:00:29]} O-O {[%emt 0:01:08]} 18. N5xd6 {[%emt 0:01:50]} Na4 {[%emt 0:00:09]} 19. f5 {[%emt 0:01:56]} Rb6 {[%emt 0:00:37]} 20. Ka1 {[%emt 0:00:11]} Bc8 {[%emt 0:01:24]} 21. Nxc8 {[%emt 0:01:42]} Rxc8 {[%emt 0:00:02]} 22. Rd7 {[%emt 0:00:25]} Kf8 {[%emt 0:02:14]} 23. b3 {[%emt 0:00:16]} Ke8 {[%emt 0:00:33]} 24. Rxe7+ {[%emt 0:00:01]} Kxe7 {[%emt 0:00:03]} 25. Na5 {[%emt 0:00:00]} Nc3 {[%emt 0:00:12]} 26. Bd3 {[%emt 0:00:05]} Nb5 {[%emt 0:00:04]} 27. Nc4 {[%emt 0:00:02]} Rh6 {[%emt 0:00:06]} 28. Nxe5 {[%emt 0:00:04]} Nd4 {[%emt 0:00:01]} 29. Kb2 {[%emt 0:00:09]} a5 {[%emt 0:00:01]} 30. c3 {[%emt 0:00:05]} Nc6 {[%emt 0:00:03]} 31. Nf3 {[%emt 0:00:05]} Rd6 {[%emt 0:00:03]} 32. Bc4 {[%emt 0:00:03]} f6 {[%emt 0:00:04]} 33. Bd5 {[%emt 0:00:05]} Na7 {[%emt 0:00:08]} 34. c4 {[%emt 0:00:03]} Nc6 {[%emt 0:00:01]} 35. a3 {[%emt 0:00:01]} Rb8 {[%emt 0:00:02]} 36. Kc3 {[%emt 0:00:05]} Nd8 {[%emt 0:00:02]} 37. b4 {[%emt 0:00:02]} axb4+ {[%emt 0:00:03]} 38. axb4 {[%emt 0:00:00]} Ra6 {[%emt 0:00:00]} 39. Nd4 {[%emt 0:00:21]} Ra3+ {[%emt 0:00:07]} 40. Nb3 {[%emt 0:00:01]} Nb7 {[%emt 0:00:05]} 41. Kb2 {[%emt 0:00:04]} Ra4 {[%emt 0:00:02]} 42. Kc3 {[%emt 0:00:16]} Nd6 {[%emt 0:00:06]} 43. b5 {[%emt 0:00:01]} Rc8 {[%emt 0:00:02]} 44. Nd2 {[%emt 0:00:06]} Ra2 {[%emt 0:00:09]} 45. Rd1 {[%emt 0:00:07]} Ra3+ {[%emt 0:00:23]} 46. Kb4 {[%emt 0:00:02]} Rd3 {[%emt 0:00:02]} 47. b6 {[%emt 0:00:09]} Rd4 {[%emt 0:00:11]} 48. Ka5 {[%emt 0:00:06]} Rc5+ {[%emt 0:00:16]} 49. Kb4 {[%emt 0:00:04]} Rc8 {[%emt 0:00:01]} 50. Kc3 {[%emt 0:00:06]} Nb5+ {[%emt 0:00:02]} 51. Kb3 {[%emt 0:00:01]} Nd6 {[%emt 0:00:01]} 52. Kc2 {[%emt 0:00:06]} Nxc4 {[%emt 0:00:15]} 53. Nxc4 {[%emt 0:00:04]} Rcxc4+ {[%emt 0:00:00]} 54. Bxc4 {[%emt 0:00:01]} Rxc4+ {[%emt 0:00:00]} 55. Kd3 {[%emt 0:00:09]} Rb4 {[%emt 0:00:02]} 56. Ra1 {[%emt 0:00:01]} Rxb6 {[%emt 0:00:03]} 57. Ra7+ {[%emt 0:00:07]} Kf8 {[%emt 0:00:01]} 58. Ke3 {[%emt 0:00:04]} Rb2 {[%emt 0:00:05]} 59. h4 {[%emt 0:00:02]} Rb3+ {[%emt 0:00:05]} 60. Kf4 {[%emt 0:00:02]} Rb4 {[%emt 0:00:02]} 61. g4 {[%emt 0:00:01]} h6 {[%emt 0:00:02]} 62. Rc7 {[%emt 0:00:05]} Ra4 {[%emt 0:00:03]} 63. Rc6 {[%emt 0:00:14]} Kf7 {[%emt 0:00:04]} 64. Rc7+ {[%emt 0:00:10]} Kf8 {[%emt 0:00:02]} 65. Rc3 {[%emt 0:00:06]} Kf7 {[%emt 0:00:03]} 66. Re3 {[%emt 0:00:01]} Ra1 {[%emt 0:00:06]} 67. g5 {[%emt 0:00:09]} hxg5+ {[%emt 0:00:19]} 68. hxg5 {[%emt 0:00:01]} Rf1+ {[%emt 0:00:04]} 69. Rf3 {[%emt 0:00:02]} fxg5+ {[%emt 0:00:06]} 70. Kg3 {[%emt 0:00:06]} Re1 {[%emt 0:00:06]} 71. Kg4 {[%emt 0:00:11]} Kf6 {[%emt 0:00:02]} 72. Rf2 {[%emt 0:00:06]} Rxe4+ {[%emt 0:00:01]} 73. Kg3 {[%emt 0:00:00]} Ke5 {[%emt 0:00:12]} 74. Rf1 {[%emt 0:00:06]} Rf4 {[%emt 0:00:05]} 75. Re1+ {[%emt 0:00:04]} Kxf5 {[%emt 0:00:03]} 76. Re7 {[%emt 0:00:00]} Kg6 {[%emt 0:00:03]} 77. Re6+ {[%emt 0:00:02]} Rf6 {[%emt 0:00:07]} 78. Re7 {[%emt 0:00:02]} Rf7 {[%emt 0:00:04]} 79. Re6+ {[%emt 0:00:01]} Kf5 {[%emt 0:00:03]} 80. Rb6 {[%emt 0:00:03]} Re7 {[%emt 0:00:02]} 81. Rb5+ {[%emt 0:00:01]} Re5 {[%emt 0:00:01]} 82. Rb7 {[%emt 0:00:02]} Kg6 {[%emt 0:00:30]} 83. Rb6+ {[%emt 0:00:01]} Kh5 {[%emt 0:00:04]} 84. Rb7 {[%emt 0:00:04]} Kh6 {[%emt 0:00:12]} 85. Rb6+ {[%emt 0:00:02]} g6 {[%emt 0:00:02]} 86. Rb8 {[%emt 0:00:02]} Re3+ {[%emt 0:00:01]} 87. Kg4 {[%emt 0:00:01]} Re4+ {[%emt 0:00:01]} 88. Kg3 {[%emt 0:00:00]} g4 {[%emt 0:00:05]} 89. Rb5 {[%emt 0:00:04]} Ra4 {[%emt 0:00:06]} 90. Rc5 {[%emt 0:00:02]} Rb4 {[%emt 0:00:03]} 91. Ra5 {[%emt 0:00:02]} g5 {[%emt 0:00:03]} 92. Ra8 {[%emt 0:00:04]} Rf4 {[%emt 0:00:08]} 93. Rb8 {[%emt 0:00:06]} Kh5 {[%emt 0:00:02]} 94. Rh8+ {[%emt 0:00:02]} Kg6 {[%emt 0:00:01]} 95. Rg8+ {[%emt 0:00:11]} Kf5 {[%emt 0:00:04]} 96. Rf8+ {[%emt 0:00:02]} Ke4 {[%emt 0:00:03]} 97. Re8+ {[%emt 0:00:01]} Kf5 {[%emt 0:00:08]} 98. Rf8+ {[%emt 0:00:01]} Ke4 {[%emt 0:00:06]} 99. Re8+ {[%emt 0:00:01]} Kf5 {[%emt 0:00:03]} 100. Rf8+ {[%emt 0:00:01]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "8.6"]
[White "Nihal Sarin"]
[Black "Shuvalova, Polina"]
[Result "1-0"]
[ECO "A13"]
[WhiteElo "2620"]
[BlackElo "2476"]
[Annotator "TA"]
[PlyCount "87"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,87,4,0,2,0,8,2,20,23,12,14,50,41,46,29,34,32,41,33,71,14,14,15,45,23,23,23,23,23,32,23,23,31,23,24,25,10,43,16,91,0,72,0,0,0,0,0,0,0,0,-3,27,35,208,208,206,190,200,198,91,97,112,97,226,216,568,556,559,506,1051,1026,1213,1208,1370,1299,1436,1402,29967,1356]} 1. Nf3 Nf6 2. c4 e6 3. Nc3 d5 4. e3 Be7 5. b3 O-O 6. Bb2 dxc4 {A13: English Opening: 1...e6.} 7. Bxc4 c5 8. d4 b6 {[#] The position is equal.} 9. d5 $146 ({Predecessor:} 9. O-O Bb7 10. Qe2 Qc7 11. Rfd1 a6 12. a4 Bd6 13. h3 cxd4 14. Nxd4 Rd8 15. Rac1 {½-½ (23) Stoer,N (1589)-Zahn,A (1690) Magdeburg 2010}) 9... exd5 10. Nxd5 {And now Ng5 would win.} Bb7 {[%cal Rf6d5]} 11. Nxe7+ Qxe7 12. O-O Nbd7 13. Qe2 Rad8 14. Rfd1 h6 15. a4 (15. Nh4 $16) 15... Ne4 16. Qc2 Ng5 17. Nxg5 Qxg5 {[%csl Gb7][%cal Rg5g2]} 18. f4 Qe7 19. Qg6 {[%csl Gb2][%cal Rg6g7]} Nf6 20. Bxf6 Qxf6 21. Qxf6 gxf6 22. Kf2 Kg7 23. g4 a6 24. h3 f5 (24... a5 $11) 25. Rac1 (25. gxf5 $16 Rfe8 26. Rg1+ Kf6 27. Rad1) 25... Kf6 (25... a5 $11 {keeps the balance.}) 26. Be2 (26. gxf5 $16 Rg8 27. a5) 26... a5 $11 27. Bd3 fxg4 28. hxg4 Rg8 29. Bc4 Ke7 30. Kg3 (30. Be2 {with more complications.} Bd5 31. Rb1 h5 32. gxh5 Rg2+ 33. Ke1) 30... Bc8 31. Rxd8 Rxd8 {[%mdl 4096] Endgame KRB-KRB} (31... Rxg4+ $14 32. Kf2 Kxd8) 32. Rh1 $18 Rg8 33. Rh4 ({Not} 33. Rxh6 Rxg4+ 34. Kf3 Rg6 $14) 33... Rg6 34. Kf3 Rd6 35. Rh5 Bb7+ 36. Kg3 Bc6 {[#]} (36... Kf8 $16) 37. f5 $1 Rd1 $2 (37... Kf8 {is tougher.} 38. Kf4 Kg7) 38. Rxh6 f6 39. Rh7+ Kd6 (39... Kd8 $142 40. Rf7 Rd6) 40. Rf7 Rg1+ 41. Kf4 Bd7 42. Rxf6+ Ke7 43. Rxb6 Rg2 44. e4 {Weighted Error Value: White=0.12/Black=0.58} (44. f6+ $142 Kd8 45. Kf3 Rg1 46. Rb8+ Kc7 {[#]} 47. f7 $1 {[%mdl 512]} Kxb8 48. f8=Q+ {[%mdl 64] Double Attack} Kb7 49. Qe7) 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "8.7"]
[White "Badelka, Olga"]
[Black "Yoo, Christopher Woojin"]
[Result "0-1"]
[ECO "D24"]
[WhiteElo "2433"]
[BlackElo "2455"]
[Annotator "ChessBase"]
[PlyCount "58"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:04]} 4. Nc3 {[%emt 0:00:02]} dxc4 {[%emt 0:00:09]} 5. e3 {[%emt 0:00:06]} a6 {[%emt 0:00:03]} 6. a4 {[%emt 0:00:01]} Bb4 {[%emt 0:00:06]} 7. Bxc4 {[%emt 0:00:07]} b6 {[%emt 0:00:03]} 8. O-O {[%emt 0:00:07]} Bb7 {[%emt 0:00:03]} 9. Qe2 {[%emt 0:00:12]} Nbd7 {[%emt 0:00:59]} 10. Rd1 {[%emt 0:00:22]} Qe7 {[%emt 0:01:54]} 11. Bd3 {[%emt 0:03:12]} c5 {[%emt 0:01:32]} 12. Na2 {[%emt 0:00:16]} a5 {[%emt 0:01:36]} 13. Nxb4 {[%emt 0:00:15]} axb4 {[%emt 0:00:02]} 14. e4 {[%emt 0:00:14]} cxd4 {[%emt 0:00:46]} 15. e5 {[%emt 0:00:57]} Nd5 {[%emt 0:00:24]} 16. Bg5 {[%emt 0:00:14]} f6 {[%emt 0:00:35]} 17. exf6 {[%emt 0:00:11]} gxf6 {[%emt 0:00:00]} 18. Bd2 {[%emt 0:00:03]} O-O {[%emt 0:01:10]} 19. Nxd4 {[%emt 0:00:38]} Ne5 {[%emt 0:00:03]} 20. Be4 {[%emt 0:00:20]} Kh8 {[%emt 0:00:24]} 21. f4 {[%emt 0:00:35]} Qc5 {[%emt 0:00:23]} 22. Bxb4 {[%emt 0:01:52]} Nxb4 {[%emt 0:00:59]} 23. Bxb7 {[%emt 0:00:12]} Ned3 {[%emt 0:00:02]} 24. Bxa8 {[%emt 0:01:21]} Qxd4+ {[%emt 0:00:05]} 25. Kf1 {[%emt 0:00:01]} Rxa8 {[%emt 0:00:04]} 26. Ra3 {[%emt 0:00:14]} Qxf4+ {[%emt 0:00:05]} 27. Qf3 {[%emt 0:00:01]} Qxf3+ {[%emt 0:00:01]} 28. gxf3 {[%emt 0:00:00]} Nxb2 {[%emt 0:00:05]} 29. Rd6 {[%emt 0:00:16]} Nc4 {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "8.8"]
[White "Lei, Tingjie"]
[Black "Liang, Awonder"]
[Result "0-1"]
[ECO "E92"]
[WhiteElo "2505"]
[BlackElo "2592"]
[Annotator "ChessBase"]
[PlyCount "56"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:00]} Bg7 {[%emt 0:00:00]} 4. e4 {[%emt 0:00:01]} d6 {[%emt 0:00:00]} 5. h3 {[%emt 0:00:01]} O-O {[%emt 0:00:01]} 6. Nf3 {[%emt 0:00:01]} e5 {[%emt 0:00:14]} 7. d5 {[%emt 0:00:02]} a5 {[%emt 0:00:11]} 8. Be3 {[%emt 0:00:04]} Na6 {[%emt 0:00:04]} 9. g4 {[%emt 0:00:01]} Nc5 {[%emt 0:00:08]} 10. Nd2 {[%emt 0:00:02]} c6 {[%emt 0:00:01]} 11. Be2 {[%emt 0:00:09]} a4 {[%emt 0:00:04]} 12. Qc2 {[%emt 0:01:53]} Qa5 {[%emt 0:00:17]} 13. f3 {[%emt 0:01:23]} Bd7 {[%emt 0:01:25]} 14. Kf2 {[%emt 0:00:03]} Ne8 {[%emt 0:03:02]} 15. Rag1 {[%emt 0:00:16]} a3 {[%emt 0:00:13]} 16. b3 {[%emt 0:00:05]} Nc7 {[%emt 0:00:07]} 17. h4 {[%emt 0:00:43]} N7a6 {[%emt 0:00:05]} 18. Ndb1 {[%emt 0:00:58]} Nb4 {[%emt 0:00:17]} 19. Qd1 {[%emt 0:00:02]} f5 {[%emt 0:01:31]} 20. gxf5 {[%emt 0:00:05]} gxf5 {[%emt 0:00:00]} 21. Bh6 {[%emt 0:00:27]} Rf7 {[%emt 0:00:02]} 22. Rxg7+ {[%emt 0:02:03]} Rxg7 {[%emt 0:00:01]} 23. Rg1 {[%emt 0:00:09]} Rg6 {[%emt 0:00:29]} 24. h5 {[%emt 0:00:15]} Qb6 {[%emt 0:00:12]} 25. hxg6 {[%emt 0:02:54]} Nxe4+ {[%emt 0:00:04]} 26. Kg2 {[%emt 0:00:01]} Qf2+ {[%emt 0:00:05]} 27. Kh1 {[%emt 0:00:02]} Qh4+ {[%emt 0:00:02]} 28. Kg2 {[%emt 0:00:03]} Qg3+ {[%emt 0:00:01]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "8.9"]
[White "Yip, Carissa"]
[Black "Saduakassova, Dinara"]
[Result "1-0"]
[WhiteElo "2430"]
[BlackElo "2500"]
[Annotator "ChessBase"]
[PlyCount "1"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "8.10"]
[White "Praggnanandhaa R"]
[Black "Salimova, Nurgyul"]
[Result "1-0"]
[ECO "D30"]
[WhiteElo "2608"]
[BlackElo "2397"]
[Annotator "TA"]
[PlyCount "189"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,189,27,96,91,88,93,95,84,57,64,87,58,54,47,70,37,42,43,39,29,41,32,51,57,55,51,54,27,35,30,49,45,47,47,85,62,74,57,200,184,237,128,128,122,120,118,125,111,141,134,145,152,252,145,218,215,227,184,233,0,245,226,272,301,281,258,337,326,275,256,202,-554,75,77,83,81,79,38,92,0,315,282,250,74,67,45,147,63,55,56,56,45,42,12,40,0,0,-14,-15,-14,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,8,8,8,0,8,8,8,8,8,0,8,8,8,8,8,8,8,0,0,0,8,8,8,8,8,8,63,63,63,63,29965,596,29973,29976,29967,29977,29983,29984,29986,29987,29987,29988,29988,29989,29989,29989,29989,29990,29990,29991]} 1. Nf3 d5 2. g3 Nf6 3. Bg2 c5 4. O-O e6 5. c4 Nc6 6. cxd5 exd5 7. d4 cxd4 8. Nxd4 Bc5 {is now debated instead of 8...Be7.} (8... Be7 $11) 9. Nxc6 $1 $16 {D30: Queen's Gambit Declined: Systems without Nc3.} bxc6 10. Qc2 $1 {[%cal Rc2c5]} Qb6 11. Nc3 $1 {[%cal Rc3a4] White is better.} Be7 12. Be3 Qa6 13. Na4 O-O $1 14. Rac1 {[#]} Bd7 $146 ({Predecessor:} 14... Rb8 15. Qxc6 Qxe2 16. Rfe1 Qh5 17. Bf4 Bd7 18. Qc2 Rbc8 19. Qb3 Bxa4 20. Qxa4 Bc5 {½-½ (34) Pena Canapa,A (1840)-Castro,C (2061) Montevideo 2017}) 15. Nc5 Bxc5 16. Bxc5 Rfe8 17. e3 Ne4 18. Bd4 Rab8 19. b3 Qb7 20. Qb2 f6 21. Rc2 a5 22. Rfc1 Qc7 23. Qa3 Qd8 24. h4 Qc7 25. Bf3 Rb5 26. Kg2 Qb8 ({Black should play} 26... Ra8 $14) 27. Be2 $18 Rb7 (27... Rb4 $142 28. Qxa5 Qb7) 28. Qxa5 (28. Ba6 $1 $18 {[%cal Ra6b7]}) 28... Qd6 $16 29. Bf3 Qe6 30. Qa6 Rbb8 31. Kg1 Qf5 32. Bg2 h5 33. Qe2 Qg6 (33... Red8 $16 34. Qf3 Qg4 35. Qxg4 hxg4 36. Bxe4 dxe4) 34. Qf3 (34. Bf3 $18) 34... Nd6 (34... Ra8 $16 35. a4 Reb8) 35. Qf4 $18 Nf5 36. Bb2 Nh6 37. Bd4 $2 (37. Rd2 $1 $18) 37... Ra8 $2 (37... Nf5 $11) 38. a4 Nf7 39. Rxc6 Bxc6 40. Rxc6 Rad8 41. Rc1 Ne5 {intending ...Nd3.} 42. Rd1 Qc2 43. Bf3 {[%mdl 8192]} (43. Ra1 $18 {and life is good for White.}) 43... Nd3 $2 {[#]} (43... Ng6 $19 44. Bxd5+ Rxd5) 44. Rxd3 $1 $16 Qxd3 45. Bxh5 Re7 46. b4 {[%mdl 1024] White has strong compensation.} Rc8 (46... Qe4 $14) 47. Bf3 ({Better is} 47. Bc5 $16 Re5 48. Bf3) 47... Qc4 $2 {[%mdl 8192]} (47... Rc1+ $11 48. Kh2 Re4 49. Bxe4 dxe4) 48. b5 Rd8 49. b6 $2 (49. Bb6 $18 {and White stays clearly on top.} Qxf4 50. gxf4) 49... Qxa4 50. h5 Qb3 {[#]} ({Black should try} 50... Qc2 $14) 51. h6 (51. Qf5 $1 $16 {And now h6! would win.} Qb5 52. h6) 51... Qb1+ $14 52. Kg2 {Hoping for hxg7.} Qg6 53. hxg7 Kxg7 54. Bc5 Rf7 55. Bd4 Rh8 56. Qg4 (56. g4 {keeps more tension.} Qh7 57. Qg5+ Kf8 58. Qh5 Qxh5 59. gxh5 Rg8+ 60. Kf1) 56... Qxg4 57. Bxg4 Rb8 (57... Re7 {is interesting.} 58. f4 Ra8 59. Kf3 Kg6 60. Bc5 Re4) 58. Be6 Rfb7 59. Bxd5 Rxb6 60. Bxb6 Rxb6 $11 {[%mdl 4096] Endgame KR-KB} 61. Kf3 Rd6 62. Ke4 Rb6 63. Kf4 Rb2 64. f3 Kg6 (64... Rd2 $5 {[%cal Rd2d5]} 65. Be4 Ra2 $11) 65. e4 Re2 66. Be6 Re1 67. Bd7 Re2 68. g4 Re1 69. Be8+ Kg7 70. g5 Rg1 71. gxf6+ Kxf6 72. Bh5 Re1 73. Bg4 Re2 74. Bd7 Re1 75. Bc6 Re2 76. Bd5 Re1 77. Bc4 Ke7 (77... Rd1 {keeps more tension.} 78. e5+ Kg6 79. Be6 Rd4+ 80. Ke3 Rb4) 78. Ke5 Rc1 79. Kd4 (79. Bd5 {looks sharper.} Rc3 80. f4 Ra3 81. Kf5 Rd3 82. Bg8) 79... Rd1+ 80. Bd3 Ke6 81. f4 Re1 82. e5 {With the idea f5+.} Rd1 83. f5+ Kd7 (83... Ke7 $11) 84. Ke4 $14 Re1+ 85. Kf4 Rg1 $2 {[%mdl 8192]} (85... Rd1 $14 86. Bb5+ Ke7) 86. f6 Ra1 87. Bf5+ {White mates.} Ke8 {[#]} 88. e6 $1 Ra7 89. Be4 Kf8 90. Ke5 Ke8 91. Kd6 Kf8 92. e7+ Kf7 93. Bd5+ Kxf6 94. e8=Q Ra6+ 95. Bc6 {Weighted Error Value: White=0.41/Black=0.55} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "9.1"]
[White "Salimova, Nurgyul"]
[Black "Zhu, Jiner"]
[Result "1/2-1/2"]
[ECO "E11"]
[WhiteElo "2397"]
[BlackElo "2459"]
[Annotator "ChessBase"]
[PlyCount "102"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:02]} e6 {[%emt 0:00:00]} 3. g3 {[%emt 0:00:10]} d5 {[%emt 0:00:00]} 4. c4 {[%emt 0:00:02]} Bb4+ {[%emt 0:00:03]} 5. Bd2 {[%emt 0:00:03]} Be7 {[%emt 0:00:02]} 6. Bg2 {[%emt 0:00:03]} O-O {[%emt 0:00:01]} 7. O-O {[%emt 0:00:05]} c6 {[%emt 0:00:03]} 8. Nc3 {[%emt 0:00:08]} dxc4 {[%emt 0:00:07]} 9. e4 {[%emt 0:01:13]} b5 {[%emt 0:00:12]} 10. e5 {[%emt 0:00:21]} Nd5 {[%emt 0:00:02]} 11. Ne4 {[%emt 0:00:01]} a5 {[%emt 0:01:01]} 12. b3 {[%emt 0:00:17]} Ba6 {[%emt 0:00:11]} 13. Re1 {[%emt 0:00:48]} Nd7 {[%emt 0:00:45]} 14. h4 {[%emt 0:00:25]} Qc7 {[%emt 0:01:43]} 15. Nfg5 {[%emt 0:01:33]} h6 {[%emt 0:01:50]} 16. Nh3 {[%emt 0:00:21]} f5 {[%emt 0:01:36]} 17. exf6 {[%emt 0:00:06]} N7xf6 {[%emt 0:00:02]} 18. bxc4 {[%emt 0:02:04]} bxc4 {[%emt 0:00:05]} 19. Rc1 {[%emt 0:00:15]} Ba3 {[%emt 0:00:46]} 20. Rc2 {[%emt 0:00:06]} Bb4 {[%emt 0:00:22]} 21. Nc5 {[%emt 0:01:15]} Bxc5 {[%emt 0:00:27]} 22. dxc5 {[%emt 0:00:00]} e5 {[%emt 0:00:08]} 23. Bf1 {[%emt 0:00:15]} Rad8 {[%emt 0:00:34]} 24. Qc1 {[%emt 0:00:26]} Rfe8 {[%emt 0:00:35]} 25. Qa3 {[%emt 0:00:09]} c3 {[%emt 0:00:30]} 26. Bxc3 {[%emt 0:00:20]} Bxf1 {[%emt 0:00:01]} 27. Rxf1 {[%emt 0:00:15]} Qd7 {[%emt 0:00:04]} 28. Kg2 {[%emt 0:00:11]} Qg4 {[%emt 0:00:17]} 29. Rcc1 {[%emt 0:00:29]} Ne4 {[%emt 0:00:24]} 30. Be1 {[%emt 0:00:06]} Qg6 {[%emt 0:00:17]} 31. f3 {[%emt 0:00:11]} Nef6 {[%emt 0:00:10]} 32. Qb3 {[%emt 0:00:22]} Kh8 {[%emt 0:00:02]} 33. Bf2 {[%emt 0:00:08]} e4 {[%emt 0:00:02]} 34. Rce1 {[%emt 0:00:11]} Rb8 {[%emt 0:00:06]} 35. Qa3 {[%emt 0:00:02]} Nh5 {[%emt 0:00:10]} 36. fxe4 {[%emt 0:00:11]} Rxe4 {[%emt 0:00:04]} 37. Qf3 {[%emt 0:00:10]} Rxe1 {[%emt 0:00:11]} 38. Rxe1 {[%emt 0:00:04]} Nhf6 {[%emt 0:00:04]} 39. Bd4 {[%emt 0:00:07]} Rb4 {[%emt 0:00:07]} 40. Bxf6 {[%emt 0:00:06]} Nxf6 {[%emt 0:00:01]} 41. Nf4 {[%emt 0:00:03]} Rb2+ {[%emt 0:00:03]} 42. Re2 {[%emt 0:00:12]} Rxe2+ {[%emt 0:00:08]} 43. Qxe2 {[%emt 0:00:04]} Qf5 {[%emt 0:00:01]} 44. Qe3 {[%emt 0:00:12]} h5 {[%emt 0:00:06]} 45. Qd4 {[%emt 0:00:03]} Qc2+ {[%emt 0:00:02]} 46. Kf3 {[%emt 0:00:01]} Qxa2 {[%emt 0:00:06]} 47. Qd8+ {[%emt 0:00:01]} Kh7 {[%emt 0:00:01]} 48. Qd3+ {[%emt 0:00:02]} Kg8 {[%emt 0:00:06]} 49. Qd8+ {[%emt 0:00:03]} Kh7 {[%emt 0:00:05]} 50. Qd3+ {[%emt 0:00:02]} Kh8 {[%emt 0:00:06]} 51. Qd8+ {[%emt 0:00:14]} Kh7 {[%emt 0:00:19]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "9.3"]
[White "Liang, Awonder"]
[Black "Yip, Carissa"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "2592"]
[BlackElo "2430"]
[Annotator "ChessBase"]
[PlyCount "97"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Bf4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:02]} d6 {[%emt 0:00:14]} 4. e4 {[%emt 0:00:04]} c6 {[%emt 0:00:01]} 5. Qd2 {[%emt 0:00:03]} Nbd7 {[%emt 0:00:05]} 6. Nf3 {[%emt 0:00:02]} Bg7 {[%emt 0:00:13]} 7. Bh6 {[%emt 0:00:04]} O-O {[%emt 0:00:07]} 8. Bxg7 {[%emt 0:00:02]} Kxg7 {[%emt 0:00:01]} 9. O-O-O {[%emt 0:00:27]} Qc7 {[%emt 0:00:25]} 10. h4 {[%emt 0:00:15]} h5 {[%emt 0:00:02]} 11. Bd3 {[%emt 0:01:01]} b5 {[%emt 0:00:12]} 12. Rdg1 {[%emt 0:02:01]} b4 {[%emt 0:00:29]} 13. Nd1 {[%emt 0:00:36]} Nb6 {[%emt 0:00:41]} 14. g4 {[%emt 0:02:25]} Nxg4 {[%emt 0:01:44]} 15. Ne3 {[%emt 0:00:01]} c5 {[%emt 0:00:31]} 16. b3 {[%emt 0:00:47]} Nxe3 {[%emt 0:01:46]} 17. Qxe3 {[%emt 0:00:12]} c4 {[%emt 0:00:01]} 18. Be2 {[%emt 0:00:37]} Ba6 {[%emt 0:00:19]} 19. Kb1 {[%emt 0:00:10]} cxb3 {[%emt 0:00:23]} 20. cxb3 {[%emt 0:00:03]} Bxe2 {[%emt 0:00:05]} 21. Qxe2 {[%emt 0:00:00]} a5 {[%emt 0:00:07]} 22. d5 {[%emt 0:00:34]} Qc3 {[%emt 0:00:30]} 23. Rc1 {[%emt 0:00:10]} Qf6 {[%emt 0:00:03]} 24. Rc6 {[%emt 0:00:06]} Nd7 {[%emt 0:00:08]} 25. Rhc1 {[%emt 0:00:09]} a4 {[%emt 0:00:02]} 26. Qb2 {[%emt 0:00:04]} Qxb2+ {[%emt 0:00:06]} 27. Kxb2 {[%emt 0:00:00]} Nc5 {[%emt 0:00:01]} 28. Rc4 {[%emt 0:00:11]} axb3 {[%emt 0:00:28]} 29. axb3 {[%emt 0:00:01]} Ra3 {[%emt 0:00:02]} 30. Rxb4 {[%emt 0:00:13]} Rfa8 {[%emt 0:00:02]} 31. Kc3 {[%emt 0:00:04]} Ra1 {[%emt 0:00:37]} 32. e5 {[%emt 0:00:43]} R8a2 {[%emt 0:00:46]} 33. exd6 {[%emt 0:00:12]} exd6 {[%emt 0:00:01]} 34. Kc4 {[%emt 0:00:28]} Rxf2 {[%emt 0:00:25]} 35. Nd4 {[%emt 0:00:02]} Rf6 {[%emt 0:00:46]} 36. Kb5 {[%emt 0:00:06]} Rh1 {[%emt 0:00:18]} 37. Rc4 {[%emt 0:00:22]} Rb1 {[%emt 0:00:27]} 38. b4 {[%emt 0:00:10]} Nd3 {[%emt 0:00:02]} 39. Rc7 {[%emt 0:00:04]} Rf2 {[%emt 0:00:31]} 40. Nc6 {[%emt 0:00:16]} Rfb2 {[%emt 0:00:15]} 41. Rd4 {[%emt 0:00:05]} Rb3 {[%emt 0:00:08]} 42. Rd7 {[%emt 0:00:07]} Rf1 {[%emt 0:00:20]} 43. Rxd6 {[%emt 0:00:07]} Nc1 {[%emt 0:00:05]} 44. Rd8 {[%emt 0:00:05]} Rf5 {[%emt 0:00:03]} 45. Kb6 {[%emt 0:00:05]} Na2 {[%emt 0:00:03]} 46. d6 {[%emt 0:00:06]} Nc3 {[%emt 0:00:03]} 47. d7 {[%emt 0:00:07]} Rb5+ {[%emt 0:00:02]} 48. Kc7 {[%emt 0:00:01]} Nd5+ {[%emt 0:00:14]} 49. Kd6 {[%emt 0:00:02]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "9.4"]
[White "Yoo, Christopher Woojin"]
[Black "Lei, Tingjie"]
[Result "1-0"]
[ECO "D38"]
[WhiteElo "2455"]
[BlackElo "2505"]
[Annotator "ChessBase"]
[PlyCount "51"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 3. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:01]} 4. Nc3 {[%emt 0:00:02]} Bb4 {[%emt 0:00:08]} 5. Qb3 {[%emt 0:00:07]} c5 {[%emt 0:00:17]} 6. Bg5 {[%emt 0:00:04]} Qa5 {[%emt 0:00:04]} 7. Bxf6 {[%emt 0:01:11]} dxc4 {[%emt 0:00:03]} 8. Qxc4 {[%emt 0:00:11]} gxf6 {[%emt 0:00:02]} 9. dxc5 {[%emt 0:00:47]} Bd7 {[%emt 0:02:51]} 10. Rc1 {[%emt 0:01:36]} Bxc5 {[%emt 0:01:15]} 11. e3 {[%emt 0:01:17]} Nc6 {[%emt 0:00:05]} 12. Be2 {[%emt 0:00:12]} Qb4 {[%emt 0:01:03]} 13. Qd3 {[%emt 0:01:26]} Ne5 {[%emt 0:01:47]} 14. Nxe5 {[%emt 0:00:24]} fxe5 {[%emt 0:00:02]} 15. Bf3 {[%emt 0:00:27]} f5 {[%emt 0:00:34]} 16. O-O {[%emt 0:00:46]} e4 {[%emt 0:00:16]} 17. Bh5+ {[%emt 0:00:07]} Ke7 {[%emt 0:00:02]} 18. Nd5+ {[%emt 0:00:13]} exd5 {[%emt 0:00:03]} 19. Qxd5 {[%emt 0:00:02]} Be6 {[%emt 0:00:19]} 20. Qe5 {[%emt 0:00:37]} b6 {[%emt 0:01:10]} 21. Qg7+ {[%emt 0:00:20]} Kd6 {[%emt 0:00:03]} 22. Rfd1+ {[%emt 0:00:43]} Kc6 {[%emt 0:00:02]} 23. Qe7 {[%emt 0:00:41]} Rac8 {[%emt 0:01:23]} 24. Qxe6+ {[%emt 0:00:07]} Kb7 {[%emt 0:00:03]} 25. Rd7+ {[%emt 0:00:04]} Ka8 {[%emt 0:00:03]} 26. Qd5+ {[%emt 0:00:02]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "9.5"]
[White "Shuvalova, Polina"]
[Black "Badelka, Olga"]
[Result "1-0"]
[ECO "B30"]
[WhiteElo "2476"]
[BlackElo "2433"]
[Annotator "ChessBase"]
[PlyCount "125"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:01]} e6 {[%emt 0:00:00]} 4. Bxc6 {[%emt 0:00:01]} bxc6 {[%emt 0:00:00]} 5. d3 {[%emt 0:00:02]} Ne7 {[%emt 0:00:00]} 6. b3 {[%emt 0:00:06]} f6 {[%emt 0:00:36]} 7. O-O {[%emt 0:00:40]} e5 {[%emt 0:00:15]} 8. c3 {[%emt 0:00:06]} Ng6 {[%emt 0:00:11]} 9. d4 {[%emt 0:00:12]} cxd4 {[%emt 0:00:18]} 10. cxd4 {[%emt 0:00:03]} Bb4 {[%emt 0:00:42]} 11. Bd2 {[%emt 0:02:01]} Be7 {[%emt 0:00:22]} 12. Bc3 {[%emt 0:00:10]} d5 {[%emt 0:01:56]} 13. Nbd2 {[%emt 0:00:56]} dxe4 {[%emt 0:00:53]} 14. Nxe4 {[%emt 0:00:03]} f5 {[%emt 0:00:35]} 15. Ng3 {[%emt 0:00:45]} e4 {[%emt 0:00:12]} 16. Ne5 {[%emt 0:00:02]} Nxe5 {[%emt 0:00:38]} 17. dxe5 {[%emt 0:00:02]} O-O {[%emt 0:00:25]} 18. Qe2 {[%emt 0:00:22]} Be6 {[%emt 0:00:01]} 19. Rfd1 {[%emt 0:00:04]} Qc7 {[%emt 0:00:10]} 20. Nh5 {[%emt 0:00:18]} Rad8 {[%emt 0:00:40]} 21. g3 {[%emt 0:01:04]} Rxd1+ {[%emt 0:01:10]} 22. Rxd1 {[%emt 0:00:02]} Rd8 {[%emt 0:00:03]} 23. Nf4 {[%emt 0:00:29]} Rxd1+ {[%emt 0:00:09]} 24. Qxd1 {[%emt 0:00:00]} Qd7 {[%emt 0:00:02]} 25. Qe2 {[%emt 0:01:00]} Bc5 {[%emt 0:00:55]} 26. h4 {[%emt 0:00:41]} Kf7 {[%emt 0:00:30]} 27. Qh5+ {[%emt 0:00:09]} Kg8 {[%emt 0:00:02]} 28. Kg2 {[%emt 0:00:31]} g6 {[%emt 0:00:10]} 29. Qe2 {[%emt 0:00:07]} Kf7 {[%emt 0:00:05]} 30. Nh3 {[%emt 0:00:21]} Be7 {[%emt 0:00:18]} 31. Nf4 {[%emt 0:00:10]} Bc5 {[%emt 0:00:08]} 32. Qe1 {[%emt 0:00:12]} Bf8 {[%emt 0:00:08]} 33. Qe2 {[%emt 0:00:37]} Bh6 {[%emt 0:00:02]} 34. Nxe6 {[%emt 0:00:12]} Qxe6 {[%emt 0:00:02]} 35. Qa6 {[%emt 0:00:03]} Qd7 {[%emt 0:00:42]} 36. Qa5 {[%emt 0:00:40]} Bf8 {[%emt 0:00:06]} 37. a4 {[%emt 0:00:09]} Be7 {[%emt 0:00:10]} 38. Bd2 {[%emt 0:00:34]} Qd3 {[%emt 0:00:04]} 39. Be3 {[%emt 0:00:07]} a6 {[%emt 0:00:21]} 40. Qc7 {[%emt 0:00:04]} Qd5 {[%emt 0:00:01]} 41. Bg5 {[%emt 0:00:09]} e3+ {[%emt 0:00:14]} 42. Kh2 {[%emt 0:00:05]} Qe6 {[%emt 0:00:02]} 43. fxe3 {[%emt 0:00:04]} Kf8 {[%emt 0:00:04]} 44. Qb8+ {[%emt 0:00:03]} Kf7 {[%emt 0:00:01]} 45. Qb7 {[%emt 0:00:04]} Kf8 {[%emt 0:00:03]} 46. Bxe7+ {[%emt 0:00:09]} Qxe7 {[%emt 0:00:00]} 47. Qc8+ {[%emt 0:00:05]} Kf7 {[%emt 0:00:02]} 48. Qxc6 {[%emt 0:00:02]} Qxe5 {[%emt 0:00:04]} 49. Qb7+ {[%emt 0:00:03]} Kf8 {[%emt 0:00:13]} 50. Qa8+ {[%emt 0:00:02]} Kg7 {[%emt 0:00:07]} 51. Qxa6 {[%emt 0:00:04]} Qxe3 {[%emt 0:00:06]} 52. Qb7+ {[%emt 0:00:03]} Kg8 {[%emt 0:00:05]} 53. Qc8+ {[%emt 0:00:03]} Kg7 {[%emt 0:00:03]} 54. Qb7+ {[%emt 0:00:05]} Kg8 {[%emt 0:00:02]} 55. b4 {[%emt 0:00:08]} Qd2+ {[%emt 0:00:03]} 56. Kh3 {[%emt 0:00:02]} Qd1 {[%emt 0:00:17]} 57. a5 {[%emt 0:00:08]} Qf1+ {[%emt 0:00:03]} 58. Qg2 {[%emt 0:00:11]} Qb5 {[%emt 0:00:02]} 59. Qa8+ {[%emt 0:00:04]} Kg7 {[%emt 0:00:01]} 60. Qa7+ {[%emt 0:00:05]} Kg8 {[%emt 0:00:04]} 61. Qa8+ {[%emt 0:00:07]} Kg7 {[%emt 0:00:01]} 62. a6 {[%emt 0:00:01]} f4 {[%emt 0:00:18]} 63. Qb7+ {[%emt 0:00:04]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "9.6"]
[White "Bjerre, Jonas Buhl"]
[Black "Nihal Sarin"]
[Result "0-1"]
[ECO "A41"]
[WhiteElo "2550"]
[BlackElo "2620"]
[Annotator "TA"]
[PlyCount "80"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,80,36,38,40,58,64,63,29,57,48,54,-3,-3,0,0,-2,8,-14,-17,-43,-25,-31,-29,-33,-32,-102,-97,-102,-104,-95,-85,-80,-79,-110,-112,-180,-99,-98,-95,-93,-96,-89,-92,-96,-95,-105,-101,-96,-97,-111,-111,-124,-124,-140,-134,-140,-140,-140,-140,-140,-133,-152,-133,-139,0,0,0,-139,-133,-460,-460,-29998,-29999]} 1. d4 g6 2. c4 Bg7 3. Nf3 d6 4. Nc3 Nc6 5. g3 Bd7 6. Bg2 {A41: 1 d4 d6: Tartakower System and Modern Defence.} Qc8 7. O-O Bh3 8. Qa4 {White is slightly better.} Kf8 {[#]} 9. Be3 $146 ({Predecessor:} 9. Bxh3 Qxh3 10. Qb5 Rb8 11. Be3 a6 12. Qb3 Nh6 13. Nd5 Qd7 14. Rfd1 Nf5 15. c5 {0-1 (58) Pau Plana,A (2065)-Fernandez Serrano,P (1991) Barcelona 2018}) 9... h5 10. Ne4 ({White should play} 10. Bxh3 $14 Qxh3 11. Rad1) 10... Bxg2 $11 11. Kxg2 h4 $1 12. Neg5 Nh6 13. Nxh4 Nxd4 14. Qd1 Ndf5 15. Nxf5 Nxf5 16. Bc1 Bf6 17. e4 {[#]} (17. Qd3 $15) 17... Nxg3 $1 $17 {[%mdl 512]} 18. hxg3 {Threatens to win with Rh1.} Bxg5 19. Rh1 Bf6 20. Rxh8+ Bxh8 21. Qh1 {[%cal Rh1h8]} Kg8 22. Qh4 (22. Qd1 $17 {was necessary.}) 22... Bf6 ({Black should try} 22... Qe6 $19 23. Bg5 Bxb2) 23. Bg5 Bxg5 24. Qxg5 {[%mdl 4096] Endgame KQR-KQR} Qe6 25. Qh4 Qf6 26. Qxf6 exf6 {KR-KR} 27. Rd1 Kf8 28. Kf3 Ke7 29. Rd3 a5 30. Ra3 b6 31. b4 Ke6 32. Ke3 f5 33. exf5+ Kxf5 34. Kd4 {[#]} Ke6 35. Ra4 Kd7 36. Ra3 Ke6 37. Re3+ Kd7 38. Ra3 $1 f5 39. Kd5 $2 {[%mdl 8192] [#]} (39. c5 $17 {is tougher.}) 39... Re8 $1 $19 40. bxa5 (40. b5 $19 Re2 41. Rd3) 40... Re4 {[%csl Gd7][%cal Rc7c6] Weighted Error Value: White=0.46/Black=0.09} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "9.7"]
[White "Gukesh D"]
[Black "Mammadzada, Gunay"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "2578"]
[BlackElo "2443"]
[Annotator "ChessBase"]
[PlyCount "115"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nf6 {[%emt 0:00:08]} 3. Bf4 {[%emt 0:00:01]} e6 {[%emt 0:00:06]} 4. e3 {[%emt 0:00:03]} Bd6 {[%emt 0:00:23]} 5. Nbd2 {[%emt 0:00:06]} O-O {[%emt 0:00:13]} 6. c3 {[%emt 0:00:32]} c5 {[%emt 0:00:05]} 7. Bd3 {[%emt 0:00:14]} Nc6 {[%emt 0:00:40]} 8. Bg3 {[%emt 0:00:33]} h6 {[%emt 0:01:14]} 9. Ne5 {[%emt 0:01:39]} Ne7 {[%emt 0:00:18]} 10. f4 {[%emt 0:00:50]} b6 {[%emt 0:01:54]} 11. Qf3 {[%emt 0:01:15]} Bb7 {[%emt 0:00:19]} 12. Bh4 {[%emt 0:00:21]} Nf5 {[%emt 0:00:24]} 13. Bxf6 {[%emt 0:00:55]} gxf6 {[%emt 0:02:20]} 14. Ng4 {[%emt 0:00:04]} Kg7 {[%emt 0:00:02]} 15. Qh3 {[%emt 0:01:16]} Rh8 {[%emt 0:00:02]} 16. O-O {[%emt 0:00:19]} h5 {[%emt 0:00:41]} 17. Nf2 {[%emt 0:00:42]} Nh6 {[%emt 0:01:09]} 18. Nf3 {[%emt 0:00:34]} f5 {[%emt 0:00:09]} 19. Rae1 {[%emt 0:01:22]} Ng4 {[%emt 0:00:18]} 20. Nd1 {[%emt 0:00:22]} Qf6 {[%emt 0:00:22]} 21. Ne5 {[%emt 0:00:03]} Rag8 {[%emt 0:00:25]} 22. Kh1 {[%emt 0:00:01]} Qh6 {[%emt 0:00:12]} 23. Qh4 {[%emt 0:00:17]} f6 {[%emt 0:00:18]} 24. Nf3 {[%emt 0:00:01]} Kf7 {[%emt 0:00:03]} 25. Re2 {[%emt 0:00:16]} Qg7 {[%emt 0:00:02]} 26. c4 {[%emt 0:00:10]} dxc4 {[%emt 0:00:06]} 27. Bxc4 {[%emt 0:00:01]} Ke7 {[%emt 0:00:11]} 28. Qh3 {[%emt 0:00:07]} Rc8 {[%emt 0:00:03]} 29. b3 {[%emt 0:00:04]} a6 {[%emt 0:00:02]} 30. a4 {[%emt 0:00:02]} Qf7 {[%emt 0:00:16]} 31. Nc3 {[%emt 0:00:02]} Kd7 {[%emt 0:00:03]} 32. e4 {[%emt 0:00:11]} Kc7 {[%emt 0:00:06]} 33. exf5 {[%emt 0:00:02]} Rcd8 {[%emt 0:00:02]} 34. Bxe6 {[%emt 0:00:03]} Qg7 {[%emt 0:00:02]} 35. Bd5 {[%emt 0:00:05]} Bxf4 {[%emt 0:00:03]} 36. Bxb7 {[%emt 0:00:06]} Kxb7 {[%emt 0:00:00]} 37. dxc5 {[%emt 0:00:04]} Rd3 {[%emt 0:00:05]} 38. Ne4 {[%emt 0:00:03]} Ne3 {[%emt 0:00:10]} 39. Rfe1 {[%emt 0:00:08]} Qg4 {[%emt 0:00:08]} 40. Nf2 {[%emt 0:00:04]} Qxh3 {[%emt 0:00:04]} 41. Nxh3 {[%emt 0:00:00]} Bh6 {[%emt 0:00:01]} 42. Nf2 {[%emt 0:00:05]} Rxb3 {[%emt 0:00:01]} 43. c6+ {[%emt 0:00:01]} Kc7 {[%emt 0:00:04]} 44. Ne4 {[%emt 0:00:04]} Rf8 {[%emt 0:00:13]} 45. Nd4 {[%emt 0:00:02]} Rb4 {[%emt 0:00:06]} 46. Ne6+ {[%emt 0:00:02]} Kxc6 {[%emt 0:00:01]} 47. Nxf8 {[%emt 0:00:00]} Rxe4 {[%emt 0:00:02]} 48. Nh7 {[%emt 0:00:03]} Re5 {[%emt 0:00:08]} 49. Nxf6 {[%emt 0:00:01]} Rxf5 {[%emt 0:00:00]} 50. Ne4 {[%emt 0:00:03]} Re5 {[%emt 0:00:14]} 51. Rxe3 {[%emt 0:00:19]} Bxe3 {[%emt 0:00:05]} 52. Rxe3 {[%emt 0:00:01]} b5 {[%emt 0:00:10]} 53. axb5+ {[%emt 0:00:01]} axb5 {[%emt 0:00:02]} 54. Kg1 {[%emt 0:00:01]} b4 {[%emt 0:00:01]} 55. Kf2 {[%emt 0:00:01]} b3 {[%emt 0:00:03]} 56. Rc3+ {[%emt 0:00:15]} Kd5 {[%emt 0:00:10]} 57. Nd2 {[%emt 0:00:02]} b2 {[%emt 0:00:14]} 58. Rb3 {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "9.8"]
[White "Keymer, Vincent"]
[Black "Murzin, Volodar"]
[Result "0-1"]
[ECO "D46"]
[WhiteElo "2591"]
[BlackElo "2478"]
[Annotator "ChessBase"]
[PlyCount "70"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} Nf6 {[%emt 0:00:12]} 4. e3 {[%emt 0:00:01]} e6 {[%emt 0:00:14]} 5. Bd3 {[%emt 0:00:01]} Bd6 {[%emt 0:00:09]} 6. O-O {[%emt 0:00:19]} O-O {[%emt 0:00:04]} 7. Nc3 {[%emt 0:00:15]} Nbd7 {[%emt 0:00:14]} 8. e4 {[%emt 0:00:30]} dxc4 {[%emt 0:00:33]} 9. Bxc4 {[%emt 0:00:08]} e5 {[%emt 0:00:02]} 10. h3 {[%emt 0:01:36]} b5 {[%emt 0:01:08]} 11. Bd3 {[%emt 0:00:17]} Bb7 {[%emt 0:00:11]} 12. dxe5 {[%emt 0:01:36]} Nxe5 {[%emt 0:00:04]} 13. Nxe5 {[%emt 0:00:05]} Bxe5 {[%emt 0:00:00]} 14. f4 {[%emt 0:00:01]} Bd4+ {[%emt 0:00:46]} 15. Kh2 {[%emt 0:00:05]} b4 {[%emt 0:00:31]} 16. Ne2 {[%emt 0:00:54]} c5 {[%emt 0:00:21]} 17. e5 {[%emt 0:01:44]} Ng4+ {[%emt 0:02:13]} 18. Kg3 {[%emt 0:00:01]} Qd5 {[%emt 0:00:10]} 19. Rf3 {[%emt 0:03:04]} Bf2+ {[%emt 0:00:24]} 20. Kxg4 {[%emt 0:00:33]} f5+ {[%emt 0:00:06]} 21. Bxf5 {[%emt 0:00:24]} Qxd1 {[%emt 0:00:09]} 22. Be6+ {[%emt 0:00:01]} Kh8 {[%emt 0:00:02]} 23. Rxf2 {[%emt 0:00:00]} Ba6 {[%emt 0:00:12]} 24. Kf3 {[%emt 0:00:06]} Rae8 {[%emt 0:00:02]} 25. Bb3 {[%emt 0:00:04]} Qd3+ {[%emt 0:00:03]} 26. Kg4 {[%emt 0:00:06]} Rxe5 {[%emt 0:00:52]} 27. fxe5 {[%emt 0:00:09]} Rxf2 {[%emt 0:00:04]} 28. Nf4 {[%emt 0:00:00]} Qe4 {[%emt 0:00:19]} 29. Kg3 {[%emt 0:00:11]} Rf1 {[%emt 0:00:04]} 30. e6 {[%emt 0:00:05]} Rxc1 {[%emt 0:00:39]} 31. Rxc1 {[%emt 0:00:02]} Qe3+ {[%emt 0:00:01]} 32. Kg4 {[%emt 0:00:00]} Qxc1 {[%emt 0:00:02]} 33. e7 {[%emt 0:00:00]} Bb5 {[%emt 0:00:02]} 34. Be6 {[%emt 0:00:17]} Qxb2 {[%emt 0:00:06]} 35. Bc4 {[%emt 0:00:09]} Be8 {[%emt 0:00:10]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "9.9"]
[White "Mendonca, Leon Luke"]
[Black "Abdusattorov, Nodirbek"]
[Result "1-0"]
[ECO "A17"]
[WhiteElo "2549"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "191"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,191,0,17,0,35,2,32,25,50,50,45,0,9,0,0,-2,-5,-26,15,10,25,21,16,-14,30,0,0,-16,27,0,0,0,0,0,15,-16,-6,-8,-14,-18,-11,-29,-11,-14,0,0,0,0,0,0,0,0,0,0,0,0,0,-99,-91,-99,-6,-6,-6,-12,0,0,0,-25,-7,-7,0,0,0,-7,-7,-82,0,0,0,-43,-7,-243,-240,-241,-232,-367,-254,-390,-390,-336,-62,-60,0,0,0,0,64,63,140,148,156,20,127,18,18,2,8,3,164,164,1340,1334,1069,961,1047,666,6725,5591,10291,8812,6613,1562,1550,1478,1328,1214,405,7,7,7,7,7,29968,29969,29973,29974,29974,29975,29975,29976,29975,29976,29976,29977,29977,29978,29979,29980,29977,29973,29973,29974,29974,29975,29975,29976,29976,29976,29976,29976,29976,29977,29975,29976,29976,29977,29981,29977,29980,29973,29981,29982,29983,29984,29983,29984,29986,29987,29988,29989,29991,29989,29996,4818]} 1. Nf3 Nf6 2. c4 e6 3. Nc3 d5 4. e3 c5 5. cxd5 Nxd5 6. b3 {[#] A17: English Opening: 1...Nf6 with ...Bb4.} Nb4 $146 ({Predecessor:} 6... Be7 7. Bb2 O-O 8. Qc2 Nc6 9. a3 b6 10. h4 f5 11. Nxd5 exd5 12. d4 Be6 13. Rd1 Rc8 14. Ba6 Rc7 15. dxc5 bxc5 16. O-O h6 17. Bc4 Kh8 18. Rd2 Bd6 19. Rfd1 Ne7 20. Be2 Rb7 21. Be5 {½-½ (21) Roiz,M (2614)-Zanan,E (2482) Israel 2018}) 7. d3 (7. Bb2 {seems wilder.} Be7 8. d4 cxd4 9. Nxd4 O-O 10. Be2) 7... b6 8. a3 {White is slightly better.} N4c6 9. Bb2 Be7 10. Be2 Bb7 11. Ne4 O-O 12. O-O Nd7 13. Qc2 e5 14. Rac1 Rc8 15. Qb1 Re8 16. Rfe1 h6 17. Bf1 Bf8 18. h3 Nf6 19. Nxf6+ Qxf6 20. Nd2 Qg6 21. Bc3 Bd6 22. Ne4 Bb8 23. b4 cxb4 24. axb4 Ne7 25. Ba1 Nf5 26. Rxc8 Rxc8 27. Rc1 Rd8 28. b5 Nh4 29. Qb4 {Hoping for Qe7.} Rd7 30. Ng3 $1 Qg5 31. Qg4 f5 32. Qxg5 hxg5 33. f3 (33. Be2 $11) 33... e4 $17 34. Kf2 {[%cal Rd3e4]} f4 (34... exd3 $6 35. Rd1 $11) (34... exf3 $17 35. gxf3 f4 36. exf4 (36. Ne4 $2 fxe3+ 37. Ke2 Bf4 $19) 36... Bxf4) 35. Nxe4 $11 fxe3+ 36. Ke1 Nf5 37. Rc4 Bf4 38. g4 Ng3 39. Be2 Rd5 40. Rb4 Rd8 41. Rc4 Bd5 42. Rc2 (42. Rc1 $11 {remains equal.}) 42... Rf8 (42... Bb3 $17 43. Rc1 Rd5) 43. Bd4 Rd8 44. Bb2 Bf7 45. d4 $2 (45. Nxg3 $11 Bxg3+ 46. Kf1) 45... Nxe2 $19 46. Kxe2 Be8 47. Rc6 (47. Nc3 $142) 47... Rd5 48. Rc8 (48. Rc3 {was the only defense.}) 48... Kf7 49. Nc3 {Black should prevent Rxe8.} Rxd4 $2 (49... Rxb5 $19 50. Bc1 (50. Nxb5 Bxb5+ 51. Ke1 Bg3+ 52. Kd1 e2+ 53. Kc2 e1=Q 54. Bc1 Qf2+ 55. Kb3 Qxd4 56. f4 gxf4 57. Rc7+ Ke6 58. Bd2 f3 59. Bc3 Qd1+ 60. Kb2 Bxc7 61. h4 Bf4 62. h5 Bc4 63. Bd2 Bxd2 64. Ka3 Qb3#) 50... Rb3 51. Bxe3 Bd7) 50. Bc1 $15 Bd7 (50... Rd7 $15) 51. Bxe3 $11 Rb4 52. Ra8 Rb3 ({Black should try} 52... Bxb5+ $11 53. Nxb5 Rxb5 54. Bxf4 (54. Rxa7+ Kf6 $11) 54... gxf4) 53. Bxf4 $14 gxf4 (53... Rxc3 $14 54. Rxa7 Ke6) 54. Rxa7 {[%mdl 4096] Endgame KRB-KRN} Ke6 55. Kd2 (55. Kd3 $1 $16) 55... Bxb5 (55... Rb2+ $1 $11 {keeps the balance.} 56. Kd3 g5) 56. Nxb5 (56. Kc2 $16 Bc4 57. Rxg7) 56... Rxb5 $11 57. Rxg7 {KR-KR} Rb3 58. Ke2 {Threatens to win with h4.} b5 $2 {[#]} (58... Rb2+ $1 $11 59. Kd3 Rb3+ 60. Ke2 Rb2+ 61. Kd3 Rb3+ 62. Ke2) 59. h4 $1 $18 Ke5 $2 (59... Rb2+ 60. Kf1 Rb3) 60. h5 Rb2+ 61. Kf1 b4 62. h6 Rh2 63. Rb7 Rxh6 64. Rxb4 Rf6 65. Rb5+ (65. Re4+ $142 Kd5 66. Ke2) 65... Kd4 66. Kf2 Rf8 67. Ra5 Rf7 68. g5 $2 (68. Ra3 $18 Kc4 69. Ke2) 68... Rb7 69. Kg2 {Strongly threatening Kh3.} Rh7 $1 70. Rf5 Ke3 $2 {[%mdl 8192] [#]} (70... Rh5 $11) 71. Re5+ $1 {White mates.} Kd3 72. g6 Rg7 73. Re6 Kd4 74. Kh3 Kd5 75. Ra6 Ke5 76. Kg4 Rb7 77. Kg5 Rb3 78. Ra5+ Ke6 79. Kxf4 Kf6 80. Ra6+ Kg7 81. Kg4 Kh6 82. f4 Rb5 83. Rc6 Ra5 84. Re6 Rb5 85. f5 Rb4+ 86. Kf3 Rb3+ 87. Kf4 Rb4+ 88. Re4 Rb5 89. Re8 Rb4+ 90. Ke5 Rb7 91. Kf6 Rb6+ 92. Kf7 Rb7+ 93. Re7 Rb5 94. f6 Rg5 95. Re1 Rg1 96. Rxg1 {Never resign too early!  Weighted Error Value: White=0.34/Black=0.35} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "9.10"]
[White "Abdumalik, Zhansaya"]
[Black "Khademalsharieh, Sarasadat"]
[Result "1-0"]
[ECO "C78"]
[WhiteElo "2472"]
[BlackElo "2494"]
[Annotator "ChessBase"]
[PlyCount "111"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 4. Ba4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. O-O {[%emt 0:00:00]} b5 {[%emt 0:00:00]} 6. Bb3 {[%emt 0:00:00]} Bc5 {[%emt 0:00:00]} 7. d3 {[%emt 0:00:15]} O-O {[%emt 0:00:15]} 8. c3 {[%emt 0:00:08]} d6 {[%emt 0:00:11]} 9. h3 {[%emt 0:00:05]} h6 {[%emt 0:00:02]} 10. Re1 {[%emt 0:00:08]} Be6 {[%emt 0:00:27]} 11. Bc2 {[%emt 0:00:03]} Bb6 {[%emt 0:00:12]} 12. Nbd2 {[%emt 0:00:03]} Ne7 {[%emt 0:00:10]} 13. Nf1 {[%emt 0:00:05]} Ng6 {[%emt 0:00:04]} 14. Ng3 {[%emt 0:00:05]} d5 {[%emt 0:00:19]} 15. exd5 {[%emt 0:00:33]} Nxd5 {[%emt 0:00:07]} 16. d4 {[%emt 0:00:28]} c5 {[%emt 0:01:04]} 17. Nxe5 {[%emt 0:00:13]} Nxe5 {[%emt 0:00:19]} 18. Rxe5 {[%emt 0:00:01]} cxd4 {[%emt 0:00:05]} 19. Qd3 {[%emt 0:00:20]} Nf6 {[%emt 0:00:27]} 20. Nh5 {[%emt 0:01:08]} Re8 {[%emt 0:01:31]} 21. Nxf6+ {[%emt 0:02:37]} Qxf6 {[%emt 0:00:03]} 22. Qh7+ {[%emt 0:00:01]} Kf8 {[%emt 0:00:01]} 23. Re2 {[%emt 0:00:16]} Rad8 {[%emt 0:01:19]} 24. b3 {[%emt 0:00:16]} b4 {[%emt 0:01:24]} 25. cxd4 {[%emt 0:00:05]} Bxd4 {[%emt 0:00:04]} 26. Rb1 {[%emt 0:00:03]} a5 {[%emt 0:00:45]} 27. Bd2 {[%emt 0:00:16]} Ke7 {[%emt 0:00:41]} 28. Rbe1 {[%emt 0:00:25]} Rh8 {[%emt 0:00:11]} 29. Qe4 {[%emt 0:00:13]} Kf8 {[%emt 0:00:03]} 30. Be3 {[%emt 0:00:50]} Bc3 {[%emt 0:00:35]} 31. Bc5+ {[%emt 0:00:09]} Kg8 {[%emt 0:00:02]} 32. Rf1 {[%emt 0:00:34]} g6 {[%emt 0:00:06]} 33. Qb7 {[%emt 0:00:19]} Rd7 {[%emt 0:00:21]} 34. Qb6 {[%emt 0:00:49]} Rd5 {[%emt 0:00:26]} 35. Be4 {[%emt 0:00:20]} Rg5 {[%emt 0:00:27]} 36. Kh1 {[%emt 0:00:38]} Kh7 {[%emt 0:00:09]} 37. f4 {[%emt 0:00:10]} Rh5 {[%emt 0:00:09]} 38. Kh2 {[%emt 0:00:28]} Rc8 {[%emt 0:00:06]} 39. Be3 {[%emt 0:00:13]} a4 {[%emt 0:00:06]} 40. bxa4 {[%emt 0:00:13]} Rd8 {[%emt 0:00:32]} 41. Ref2 {[%emt 0:00:14]} Bd4 {[%emt 0:00:16]} 42. Bxd4 {[%emt 0:00:05]} Qxd4 {[%emt 0:00:04]} 43. Qb7 {[%emt 0:00:14]} Rd7 {[%emt 0:00:08]} 44. Qa8 {[%emt 0:00:06]} Ra7 {[%emt 0:00:12]} 45. Qc6 {[%emt 0:00:05]} Rc5 {[%emt 0:00:04]} 46. Qb6 {[%emt 0:00:05]} Rxa4 {[%emt 0:00:05]} 47. Bxg6+ {[%emt 0:00:05]} Kg7 {[%emt 0:00:06]} 48. f5 {[%emt 0:00:05]} Bxa2 {[%emt 0:00:04]} 49. Bh5 {[%emt 0:00:08]} Qe5+ {[%emt 0:00:02]} 50. Kh1 {[%emt 0:00:03]} Bd5 {[%emt 0:00:05]} 51. f6+ {[%emt 0:00:06]} Kh7 {[%emt 0:00:02]} 52. Bd1 {[%emt 0:00:14]} Ra3 {[%emt 0:00:02]} 53. Bg4 {[%emt 0:00:09]} Be4 {[%emt 0:00:22]} 54. Qxb4 {[%emt 0:00:06]} Rcc3 {[%emt 0:00:02]} 55. Kg1 {[%emt 0:00:04]} Bg6 {[%emt 0:00:11]} 56. Qf8 {[%emt 0:00:02]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "10.1"]
[White "Zhu, Jiner"]
[Black "Khademalsharieh, Sarasadat"]
[Result "1-0"]
[ECO "C29"]
[WhiteElo "2459"]
[BlackElo "2494"]
[Annotator "ChessBase"]
[PlyCount "45"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nc3 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 3. f4 {[%emt 0:00:00]} d5 {[%emt 0:00:04]} 4. fxe5 {[%emt 0:00:00]} Nxe4 {[%emt 0:00:01]} 5. Qf3 {[%emt 0:00:01]} Nxc3 {[%emt 0:00:15]} 6. bxc3 {[%emt 0:00:01]} Be7 {[%emt 0:00:03]} 7. d4 {[%emt 0:00:14]} O-O {[%emt 0:00:20]} 8. Bd3 {[%emt 0:00:01]} c5 {[%emt 0:00:11]} 9. Ne2 {[%emt 0:00:21]} c4 {[%emt 0:00:18]} 10. Bf5 {[%emt 0:00:01]} Bxf5 {[%emt 0:00:28]} 11. Qxf5 {[%emt 0:00:02]} f6 {[%emt 0:00:01]} 12. O-O {[%emt 0:01:15]} fxe5 {[%emt 0:00:27]} 13. Qe6+ {[%emt 0:00:03]} Kh8 {[%emt 0:00:02]} 14. Rxf8+ {[%emt 0:00:20]} Bxf8 {[%emt 0:00:04]} 15. dxe5 {[%emt 0:02:11]} Bc5+ {[%emt 0:00:40]} 16. Kh1 {[%emt 0:00:16]} Nc6 {[%emt 0:00:06]} 17. Bf4 {[%emt 0:00:12]} Qg8 {[%emt 0:02:39]} 18. Qd7 {[%emt 0:00:35]} Re8 {[%emt 0:00:16]} 19. Ng3 {[%emt 0:02:53]} Nxe5 {[%emt 0:00:50]} 20. Bxe5 {[%emt 0:00:04]} Rxe5 {[%emt 0:00:01]} 21. Qc7 {[%emt 0:00:09]} Re3 {[%emt 0:00:42]} 22. Qxc5 {[%emt 0:00:05]} Rxc3 {[%emt 0:00:25]} 23. Rf1 {[%emt 0:00:09]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "10.2"]
[White "Abdusattorov, Nodirbek"]
[Black "Abdumalik, Zhansaya"]
[Result "1-0"]
[ECO "C55"]
[WhiteElo "2627"]
[BlackElo "2472"]
[Annotator "TA"]
[PlyCount "119"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,119,38,40,41,31,35,27,18,-2,25,5,29,4,7,-39,79,79,69,59,70,65,128,122,135,89,78,87,108,113,101,83,88,76,90,73,99,85,101,86,113,90,111,117,98,90,73,106,93,0,104,80,72,67,94,43,81,79,131,123,129,19,94,64,140,123,182,152,270,268,329,322,321,327,297,274,245,212,310,291,310,310,272,204,446,428,591,562,594,588,573,571,815,717,1005,1029,954,1025,1024,995,1029,1096,1955,1926,1813,1489,5804,6000,2848,2677,29979,1137]} 1. e4 e5 2. Nf3 Nc6 3. Bc4 Nf6 4. d3 Be7 5. O-O d6 6. a4 {[%cal Ba2a4,Ba4a5][%mdl 32]} O-O {C55: Two Knights: 4 d3, 4 d4 exd4 5 e5 and Max Lange Attack.} 7. a5 a6 8. c3 Be6 {White has an edge.} 9. Nbd2 d5 10. exd5 {[#]} Nxd5 $146 ({Predecessor:} 10... Bxd5 11. Re1 Bxc4 12. Nxc4 e4 13. dxe4 Qxd1 14. Rxd1 Nxe4 15. Be3 Rad8 16. Nd4 Nxd4 17. Bxd4 Bc5 {½-½ (17) Izrailev,A (2261)-Hermann,M (2320) Germany 2014}) 11. Re1 Nf4 12. Bxe6 Nxe6 {[#]} (12... fxe6 $15 {stays ahead.} 13. Ne4 Nxd3) 13. Nc4 $1 $16 Bd6 14. Nfxe5 Nxe5 15. Nxe5 Qh4 (15... Bxe5 $14 16. Rxe5 Qd6) 16. g3 Qh3 17. Qg4 Qxg4 18. Nxg4 c5 19. f4 h5 20. Nf2 g6 21. Kg2 Rfd8 22. Kf3 Kg7 23. Be3 Rac8 24. Ra4 Bf8 25. Rc4 f5 26. Ra1 Kf7 27. Ra3 Rd7 28. Rb3 Nd8 29. Ra3 (29. Rb6 $16) 29... Rcc7 (29... Ne6 $11 {remains equal.}) 30. Ke2 Rc6 31. Kd2 Ke8 32. Rb3 (32. h4 $16) 32... Nf7 33. Ke2 Re6 ({Black should play} 33... Re7) 34. Kf3 Rc7 35. Ra4 (35. Rb6 $16 Rec6 36. d4) 35... Kd7 (35... Nd8 $1 $11 {keeps the balance.}) 36. Nh3 {White leaves nothing to chance now.} Nd6 (36... Be7 $14) 37. Rb6 c4 (37... Nf7 $16) 38. Nf2 Re8 (38... Be7 $16 39. Bd4 g5) 39. Bd4 $18 cxd3 40. Nxd3 Kc8 41. Ne5 Re6 42. c4 {Hoping for c5.} Re8 43. b3 g5 (43... Rd8 $142 44. Be3 (44. Nxg6 Ne4 $18) 44... Bg7 45. Nxg6 Ne4) 44. fxg5 Ne4 45. Kf4 Bg7 46. Kxf5 Nc5 (46... Nxg5 47. Kxg5 Bxe5) 47. Ra3 Nd7 {[%cal Rd7e5]} 48. Re6 {[%cal Re6e8]} Rf8+ 49. Kg6 {[%mdl 64] [#] Double Attack} Bxe5 50. Bxe5 Rc6 51. Bd6 Rd8 52. Kf7 Nc5 53. Bxc5 Rxc5 {[%mdl 4096] Endgame KRR-KRR} 54. g6 Rg5 55. Ra2 Rd7+ 56. Kf6 Rg4 57. Rae2 Rd3 58. Re8+ Kc7 59. R2e7+ Kc6 60. Rc8+ {Weighted Error Value: White=0.19/Black=0.36} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "10.3"]
[White "Murzin, Volodar"]
[Black "Mendonca, Leon Luke"]
[Result "1-0"]
[ECO "B53"]
[WhiteElo "2478"]
[BlackElo "2549"]
[Annotator "ChessBase"]
[PlyCount "99"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:01]} 4. Qxd4 {[%emt 0:00:01]} Nf6 {[%emt 0:00:12]} 5. Be2 {[%emt 0:00:16]} Nc6 {[%emt 0:00:06]} 6. Qe3 {[%emt 0:00:03]} g6 {[%emt 0:00:12]} 7. O-O {[%emt 0:00:02]} Bg7 {[%emt 0:00:01]} 8. Rd1 {[%emt 0:00:03]} O-O {[%emt 0:00:30]} 9. Nc3 {[%emt 0:00:06]} Qb6 {[%emt 0:01:14]} 10. Qxb6 {[%emt 0:02:46]} axb6 {[%emt 0:00:00]} 11. Be3 {[%emt 0:00:12]} Nb4 {[%emt 0:02:03]} 12. Rdc1 {[%emt 0:00:28]} Nd7 {[%emt 0:01:24]} 13. Bd4 {[%emt 0:00:31]} Nc5 {[%emt 0:00:16]} 14. a3 {[%emt 0:00:17]} Nc6 {[%emt 0:00:17]} 15. Bxg7 {[%emt 0:00:03]} Kxg7 {[%emt 0:00:00]} 16. Rd1 {[%emt 0:02:30]} Na4 {[%emt 0:01:00]} 17. Nxa4 {[%emt 0:00:10]} Rxa4 {[%emt 0:00:00]} 18. Nd2 {[%emt 0:00:13]} Be6 {[%emt 0:00:07]} 19. c3 {[%emt 0:00:07]} Rc8 {[%emt 0:00:18]} 20. Re1 {[%emt 0:00:10]} g5 {[%emt 0:00:26]} 21. f3 {[%emt 0:00:37]} Ne5 {[%emt 0:00:13]} 22. Kf2 {[%emt 0:00:03]} Ra5 {[%emt 0:00:31]} 23. Rad1 {[%emt 0:00:14]} Bc4 {[%emt 0:00:22]} 24. Nxc4 {[%emt 0:00:34]} Nxc4 {[%emt 0:00:01]} 25. Bxc4 {[%emt 0:00:00]} Rxc4 {[%emt 0:00:01]} 26. Re2 {[%emt 0:00:02]} Kf6 {[%emt 0:00:15]} 27. Ke3 {[%emt 0:00:03]} Rac5 {[%emt 0:00:20]} 28. Red2 {[%emt 0:00:37]} Rc8 {[%emt 0:00:13]} 29. Rd4 {[%emt 0:00:10]} h5 {[%emt 0:00:19]} 30. Rd5 {[%emt 0:00:36]} R8c5 {[%emt 0:00:12]} 31. R1d4 {[%emt 0:00:15]} Rxd5 {[%emt 0:01:19]} 32. Rxd5 {[%emt 0:00:06]} Rc5 {[%emt 0:00:03]} 33. Rxc5 {[%emt 0:01:05]} bxc5 {[%emt 0:00:15]} 34. a4 {[%emt 0:00:11]} Ke5 {[%emt 0:00:05]} 35. b4 {[%emt 0:00:09]} cxb4 {[%emt 0:00:24]} 36. cxb4 {[%emt 0:00:00]} d5 {[%emt 0:00:01]} 37. a5 {[%emt 0:00:03]} dxe4 {[%emt 0:00:09]} 38. fxe4 {[%emt 0:00:01]} Kd6 {[%emt 0:00:05]} 39. Kd4 {[%emt 0:00:02]} Kc6 {[%emt 0:00:09]} 40. Kc4 {[%emt 0:00:01]} f6 {[%emt 0:00:10]} 41. b5+ {[%emt 0:00:02]} Kd7 {[%emt 0:00:02]} 42. Kc5 {[%emt 0:00:07]} e6 {[%emt 0:00:07]} 43. a6 {[%emt 0:00:18]} bxa6 {[%emt 0:00:02]} 44. bxa6 {[%emt 0:00:00]} Kc7 {[%emt 0:00:01]} 45. a7 {[%emt 0:00:01]} Kb7 {[%emt 0:00:01]} 46. Kd6 {[%emt 0:00:01]} f5 {[%emt 0:00:01]} 47. exf5 {[%emt 0:00:01]} exf5 {[%emt 0:00:00]} 48. Ke5 {[%emt 0:00:01]} f4 {[%emt 0:00:01]} 49. Kf5 {[%emt 0:00:05]} h4 {[%emt 0:00:14]} 50. h3 {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "10.4"]
[White "Mammadzada, Gunay"]
[Black "Keymer, Vincent"]
[Result "0-1"]
[ECO "B90"]
[WhiteElo "2443"]
[BlackElo "2591"]
[Annotator "ChessBase"]
[PlyCount "72"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:00]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 6. Be3 {[%emt 0:00:01]} e5 {[%emt 0:00:01]} 7. Nb3 {[%emt 0:00:01]} Be7 {[%emt 0:00:01]} 8. Qd2 {[%emt 0:00:02]} Ng4 {[%emt 0:00:02]} 9. g3 {[%emt 0:00:01]} Nd7 {[%emt 0:00:20]} 10. Bh3 {[%emt 0:00:57]} Ndf6 {[%emt 0:00:36]} 11. Bxg4 {[%emt 0:00:04]} Bxg4 {[%emt 0:00:05]} 12. Qd3 {[%emt 0:00:16]} O-O {[%emt 0:00:28]} 13. h3 {[%emt 0:00:42]} Be6 {[%emt 0:00:08]} 14. O-O-O {[%emt 0:00:10]} b5 {[%emt 0:00:29]} 15. f4 {[%emt 0:00:08]} Bc4 {[%emt 0:01:18]} 16. Qd2 {[%emt 0:00:04]} a5 {[%emt 0:01:02]} 17. Qg2 {[%emt 0:00:21]} Qc7 {[%emt 0:00:18]} 18. Kb1 {[%emt 0:01:00]} b4 {[%emt 0:00:28]} 19. Nd5 {[%emt 0:00:41]} Nxd5 {[%emt 0:00:50]} 20. exd5 {[%emt 0:00:04]} a4 {[%emt 0:00:00]} 21. Nc1 {[%emt 0:01:19]} Rfc8 {[%emt 0:01:12]} 22. Rh2 {[%emt 0:02:19]} Bf6 {[%emt 0:01:29]} 23. fxe5 {[%emt 0:00:37]} Bxe5 {[%emt 0:00:03]} 24. Bd4 {[%emt 0:00:03]} Bxd4 {[%emt 0:00:07]} 25. Rxd4 {[%emt 0:00:02]} a3 {[%emt 0:00:03]} 26. b3 {[%emt 0:00:06]} Be2 {[%emt 0:00:06]} 27. c4 {[%emt 0:00:16]} Bh5 {[%emt 0:00:58]} 28. Qd2 {[%emt 0:00:08]} Qa7 {[%emt 0:00:35]} 29. g4 {[%emt 0:00:29]} Bg6+ {[%emt 0:00:03]} 30. Ka1 {[%emt 0:00:01]} Re8 {[%emt 0:00:01]} 31. Rh1 {[%emt 0:00:03]} Re5 {[%emt 0:00:32]} 32. Rd1 {[%emt 0:01:37]} Rae8 {[%emt 0:00:32]} 33. Qxb4 {[%emt 0:00:15]} Bc2 {[%emt 0:00:03]} 34. Qxd6 {[%emt 0:00:16]} Bxd1 {[%emt 0:00:11]} 35. Rxd1 {[%emt 0:00:00]} Re1 {[%emt 0:00:07]} 36. Rxe1 {[%emt 0:00:13]} Qd4+ {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "10.5"]
[White "Nihal Sarin"]
[Black "Gukesh D"]
[Result "1/2-1/2"]
[ECO "C70"]
[WhiteElo "2620"]
[BlackElo "2578"]
[Annotator "RC"]
[PlyCount "90"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:02]} a6 {[%emt 0:00:08]} 4. Ba4 {[%emt 0:00:03]} Bc5 {[%emt 0:00:05]} 5. c3 {[%emt 0:00:56]} Nge7 {[%emt 0:00:13]} 6. d4 {[%emt 0:00:14]} exd4 {[%emt 0:00:19]} 7. cxd4 {[%emt 0:00:00]} Bb4+ {[%emt 0:00:01]} 8. Bd2 {[%emt 0:00:05]} Bxd2+ {[%emt 0:00:08]} 9. Qxd2 {[%emt 0:00:34]} d5 {[%emt 0:00:07]} 10. exd5 {[%emt 0:00:16]} Nxd5 {[%emt 0:00:08]} 11. Bxc6+ {[%emt 0:00:02]} bxc6 {[%emt 0:00:01]} 12. O-O {[%emt 0:00:01]} O-O {[%emt 0:00:03]} 13. Nc3 {[%emt 0:00:05]} Nxc3 {[%emt 0:00:18]} 14. Qxc3 {[%emt 0:00:00]} Be6 {[%emt 0:00:01]} 15. Ne5 {[%emt 0:01:16]} Bd5 {[%emt 0:00:13]} 16. Nxc6 {[%emt 0:00:05]} Bxc6 {[%emt 0:00:18]} 17. Qxc6 {[%emt 0:00:00]} Qxd4 {[%emt 0:00:01]} 18. b3 {[%emt 0:00:18]} a5 {[%emt 0:01:44]} 19. Rac1 {[%emt 0:00:46]} a4 {[%emt 0:01:19]} 20. Rc4 {[%emt 0:01:31]} Qb6 {[%emt 0:00:40]} 21. Qxb6 {[%emt 0:00:19]} cxb6 {[%emt 0:00:02]} 22. bxa4 {[%emt 0:00:37]} Rfd8 {[%emt 0:00:53]} 23. g3 {[%emt 0:00:21]} Rd2 {[%emt 0:01:39]} 24. Rb1 {[%emt 0:00:06]} Rxa2 {[%emt 0:00:17]} 25. Rxb6 {[%emt 0:00:04]} g6 {[%emt 0:00:01]} 26. Rbb4 {[%emt 0:00:07]} h5 {[%emt 0:00:11]} 27. h4 {[%emt 0:00:03]} Kg7 {[%emt 0:00:04]} 28. Kg2 {[%emt 0:00:01]} Ra7 {[%emt 0:00:02]} 29. Rf4 {[%emt 0:00:02]} Ra3 {[%emt 0:00:11]} 30. Rbc4 {[%emt 0:00:01]} Ra2 {[%emt 0:00:03]} 31. Kf3 {[%emt 0:00:02]} Ra3+ {[%emt 0:00:02]} 32. Ke2 {[%emt 0:00:07]} Rb7 {[%emt 0:00:23]} 33. Rb4 {[%emt 0:00:24]} Rc7 {[%emt 0:00:09]} 34. Kd2 {[%emt 0:00:28]} Ra1 {[%emt 0:01:37]} 35. Rbc4 {[%emt 0:00:21]} Rb7 {[%emt 0:00:04]} 36. Kc3 {[%emt 0:00:27]} Ra7 {[%emt 0:00:37]} 37. Kb2 {[%emt 0:00:09]} Re1 {[%emt 0:00:02]} 38. Rc5 {[%emt 0:00:21]} Re2+ {[%emt 0:00:18]} 39. Kb3 {[%emt 0:00:03]} Re1 {[%emt 0:00:04]} 40. Rc2 {[%emt 0:01:53]} Rb7+ {[%emt 0:00:09]} 41. Ka2 {[%emt 0:00:12]} Ra7 {[%emt 0:00:03]} 42. Rb2 {[%emt 0:00:16]} Rd1 {[%emt 0:00:17]} 43. Rc2 {[%emt 0:00:21]} Re1 {[%emt 0:00:03]} 44. Rb2 {[%emt 0:00:01]} Rd1 {[%emt 0:00:01]} 45. Rc2 {[%emt 0:00:16]} Re1 {[%emt 0:00:02]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "10.6"]
[White "Badelka, Olga"]
[Black "Bjerre, Jonas Buhl"]
[Result "0-1"]
[ECO "E46"]
[WhiteElo "2433"]
[BlackElo "2550"]
[Annotator "ChessBase"]
[PlyCount "116"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:00]} Bb4 {[%emt 0:00:00]} 4. e3 {[%emt 0:00:00]} O-O {[%emt 0:00:03]} 5. Nge2 {[%emt 0:00:03]} Re8 {[%emt 0:00:13]} 6. a3 {[%emt 0:00:03]} Bf8 {[%emt 0:00:01]} 7. d5 {[%emt 0:00:01]} a5 {[%emt 0:00:09]} 8. Ng3 {[%emt 0:00:06]} Na6 {[%emt 0:00:11]} 9. Be2 {[%emt 0:00:05]} Nc5 {[%emt 0:00:05]} 10. e4 {[%emt 0:00:13]} exd5 {[%emt 0:00:23]} 11. exd5 {[%emt 0:00:03]} a4 {[%emt 0:00:15]} 12. Be3 {[%emt 0:01:31]} d6 {[%emt 0:01:17]} 13. O-O {[%emt 0:00:29]} Bd7 {[%emt 0:00:07]} 14. Qc2 {[%emt 0:00:27]} g6 {[%emt 0:01:15]} 15. Rae1 {[%emt 0:00:05]} Bg7 {[%emt 0:00:04]} 16. Bd1 {[%emt 0:01:29]} h5 {[%emt 0:01:21]} 17. Bg5 {[%emt 0:00:06]} Rxe1 {[%emt 0:00:17]} 18. Rxe1 {[%emt 0:00:01]} Qf8 {[%emt 0:00:01]} 19. h3 {[%emt 0:01:37]} Re8 {[%emt 0:00:44]} 20. Re2 {[%emt 0:00:10]} Nh7 {[%emt 0:00:18]} 21. Be3 {[%emt 0:00:05]} h4 {[%emt 0:00:19]} 22. Bxc5 {[%emt 0:00:42]} dxc5 {[%emt 0:00:23]} 23. Nge4 {[%emt 0:00:39]} Bd4 {[%emt 0:00:58]} 24. Qd3 {[%emt 0:00:39]} Qh6 {[%emt 0:01:07]} 25. Nd2 {[%emt 0:00:41]} Qf4 {[%emt 0:00:24]} 26. Rxe8+ {[%emt 0:00:07]} Bxe8 {[%emt 0:00:02]} 27. Nf3 {[%emt 0:00:27]} Bf6 {[%emt 0:00:35]} 28. Bxa4 {[%emt 0:00:22]} Bxc3 {[%emt 0:00:14]} 29. Bxe8 {[%emt 0:00:07]} Bxb2 {[%emt 0:00:08]} 30. Qe2 {[%emt 0:00:46]} Bf6 {[%emt 0:00:29]} 31. a4 {[%emt 0:00:21]} Nf8 {[%emt 0:00:23]} 32. Bb5 {[%emt 0:00:16]} b6 {[%emt 0:00:09]} 33. Bc6 {[%emt 0:00:03]} Kg7 {[%emt 0:00:07]} 34. Bb5 {[%emt 0:00:03]} Bd4 {[%emt 0:00:05]} 35. Bc6 {[%emt 0:00:19]} Nh7 {[%emt 0:00:01]} 36. Nxd4 {[%emt 0:00:18]} cxd4 {[%emt 0:00:10]} 37. c5 {[%emt 0:00:14]} Qc1+ {[%emt 0:00:05]} 38. Kh2 {[%emt 0:00:01]} Qxc5 {[%emt 0:00:02]} 39. Qe5+ {[%emt 0:00:02]} Nf6 {[%emt 0:00:06]} 40. Qxc7 {[%emt 0:00:15]} d3 {[%emt 0:00:14]} 41. d6 {[%emt 0:00:02]} Qe5+ {[%emt 0:00:09]} 42. Kg1 {[%emt 0:00:03]} d2 {[%emt 0:00:21]} 43. Bf3 {[%emt 0:00:01]} Qe1+ {[%emt 0:00:06]} 44. Kh2 {[%emt 0:00:01]} d1=Q {[%emt 0:00:04]} 45. Bxd1 {[%emt 0:00:02]} Qxd1 {[%emt 0:00:02]} 46. Qxb6 {[%emt 0:00:06]} Ne4 {[%emt 0:00:03]} 47. Qb2+ {[%emt 0:00:22]} Kh7 {[%emt 0:00:06]} 48. a5 {[%emt 0:00:19]} Qxd6+ {[%emt 0:00:05]} 49. Kg1 {[%emt 0:00:01]} Qd1+ {[%emt 0:00:04]} 50. Kh2 {[%emt 0:00:01]} Nd2 {[%emt 0:00:12]} 51. g4 {[%emt 0:00:09]} hxg3+ {[%emt 0:00:07]} 52. Kxg3 {[%emt 0:00:02]} Qf3+ {[%emt 0:00:02]} 53. Kh2 {[%emt 0:00:06]} Qxf2+ {[%emt 0:00:02]} 54. Kh1 {[%emt 0:00:01]} Qf1+ {[%emt 0:00:03]} 55. Kh2 {[%emt 0:00:01]} Qe2+ {[%emt 0:00:09]} 56. Kh1 {[%emt 0:00:03]} Qe4+ {[%emt 0:00:02]} 57. Kh2 {[%emt 0:00:06]} Nc4 {[%emt 0:00:11]} 58. Qc3 {[%emt 0:00:24]} Qe5+ {[%emt 0:00:04]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "10.7"]
[White "Lei, Tingjie"]
[Black "Shuvalova, Polina"]
[Result "1/2-1/2"]
[ECO "C54"]
[WhiteElo "2505"]
[BlackElo "2476"]
[Annotator "ChessBase"]
[PlyCount "104"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:02]} Nc6 {[%emt 0:00:00]} 3. Bc4 {[%emt 0:00:01]} Bc5 {[%emt 0:00:00]} 4. c3 {[%emt 0:00:03]} Nf6 {[%emt 0:00:02]} 5. d3 {[%emt 0:00:01]} d6 {[%emt 0:00:01]} 6. O-O {[%emt 0:00:05]} O-O {[%emt 0:00:05]} 7. Bd2 {[%emt 0:00:08]} a6 {[%emt 0:00:21]} 8. Bb3 {[%emt 0:00:50]} Re8 {[%emt 0:00:09]} 9. h3 {[%emt 0:00:06]} h6 {[%emt 0:00:02]} 10. Re1 {[%emt 0:00:02]} Be6 {[%emt 0:00:07]} 11. Bxe6 {[%emt 0:00:20]} Rxe6 {[%emt 0:00:07]} 12. Nh4 {[%emt 0:01:11]} d5 {[%emt 0:00:44]} 13. Nf5 {[%emt 0:00:43]} Ne7 {[%emt 0:00:35]} 14. Nxe7+ {[%emt 0:00:43]} Qxe7 {[%emt 0:00:11]} 15. Be3 {[%emt 0:02:16]} Rd8 {[%emt 0:00:14]} 16. Bxc5 {[%emt 0:00:24]} Qxc5 {[%emt 0:00:02]} 17. Nd2 {[%emt 0:00:04]} dxe4 {[%emt 0:01:57]} 18. dxe4 {[%emt 0:02:11]} Red6 {[%emt 0:01:30]} 19. Nb3 {[%emt 0:00:02]} Qc4 {[%emt 0:00:37]} 20. Qc2 {[%emt 0:00:48]} b6 {[%emt 0:00:32]} 21. Re2 {[%emt 0:00:15]} Qa4 {[%emt 0:00:16]} 22. Rae1 {[%emt 0:00:17]} c5 {[%emt 0:00:15]} 23. c4 {[%emt 0:00:22]} Nh7 {[%emt 0:00:26]} 24. Nc1 {[%emt 0:00:39]} Qxc2 {[%emt 0:00:17]} 25. Rxc2 {[%emt 0:00:02]} Ng5 {[%emt 0:00:04]} 26. f3 {[%emt 0:00:15]} Ne6 {[%emt 0:00:30]} 27. Ne2 {[%emt 0:00:03]} Rd1 {[%emt 0:01:12]} 28. Rxd1 {[%emt 0:00:08]} Rxd1+ {[%emt 0:00:02]} 29. Kf2 {[%emt 0:00:01]} g5 {[%emt 0:00:32]} 30. Nc3 {[%emt 0:00:08]} Ra1 {[%emt 0:00:08]} 31. a3 {[%emt 0:00:12]} Nd4 {[%emt 0:00:16]} 32. Rd2 {[%emt 0:00:02]} Rc1 {[%emt 0:00:02]} 33. Na4 {[%emt 0:00:11]} b5 {[%emt 0:00:13]} 34. Nxc5 {[%emt 0:00:01]} Rxc4 {[%emt 0:00:38]} 35. Nd7 {[%emt 0:00:01]} Nc6 {[%emt 0:00:07]} 36. Nf6+ {[%emt 0:00:04]} Kg7 {[%emt 0:00:02]} 37. Ng4 {[%emt 0:00:01]} h5 {[%emt 0:00:19]} 38. Ne3 {[%emt 0:00:03]} Rc1 {[%emt 0:00:09]} 39. Nf5+ {[%emt 0:00:01]} Kf8 {[%emt 0:00:22]} 40. Rd7 {[%emt 0:00:03]} Ke8 {[%emt 0:00:05]} 41. Rc7 {[%emt 0:00:07]} Rc2+ {[%emt 0:00:02]} 42. Kf1 {[%emt 0:00:17]} f6 {[%emt 0:00:03]} 43. Ne3 {[%emt 0:00:09]} Rc1+ {[%emt 0:00:04]} 44. Kf2 {[%emt 0:00:02]} Kd8 {[%emt 0:00:00]} 45. Rf7 {[%emt 0:00:02]} Rb1 {[%emt 0:00:06]} 46. Rxf6 {[%emt 0:00:05]} Rxb2+ {[%emt 0:00:03]} 47. Kf1 {[%emt 0:00:13]} Kd7 {[%emt 0:00:04]} 48. Nd5 {[%emt 0:00:09]} a5 {[%emt 0:00:09]} 49. Nb6+ {[%emt 0:00:01]} Kc7 {[%emt 0:00:01]} 50. Nd5+ {[%emt 0:00:01]} Kd7 {[%emt 0:00:01]} 51. Nb6+ {[%emt 0:00:02]} Kc7 {[%emt 0:00:01]} 52. Nd5+ {[%emt 0:00:01]} Kd7 {[%emt 0:00:13]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "10.8"]
[White "Yip, Carissa"]
[Black "Yoo, Christopher Woojin"]
[Result "0-1"]
[ECO "B45"]
[WhiteElo "2430"]
[BlackElo "2455"]
[Annotator "ChessBase"]
[PlyCount "78"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:00]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:02]} Nc6 {[%emt 0:00:00]} 6. Nxc6 {[%emt 0:00:11]} bxc6 {[%emt 0:00:03]} 7. e5 {[%emt 0:00:03]} Nd5 {[%emt 0:00:02]} 8. Ne4 {[%emt 0:00:09]} Qc7 {[%emt 0:00:02]} 9. f4 {[%emt 0:00:02]} Rb8 {[%emt 0:00:02]} 10. Bd3 {[%emt 0:00:35]} Qb6 {[%emt 0:00:26]} 11. c4 {[%emt 0:00:38]} Bb4+ {[%emt 0:02:00]} 12. Ke2 {[%emt 0:00:02]} f5 {[%emt 0:00:03]} 13. exf6 {[%emt 0:01:52]} Nxf6 {[%emt 0:00:03]} 14. Be3 {[%emt 0:00:17]} Qa5 {[%emt 0:01:12]} 15. Nxf6+ {[%emt 0:01:11]} gxf6 {[%emt 0:00:02]} 16. a3 {[%emt 0:00:09]} Be7 {[%emt 0:01:20]} 17. b4 {[%emt 0:00:26]} Qc7 {[%emt 0:00:02]} 18. Kf2 {[%emt 0:00:08]} O-O {[%emt 0:01:56]} 19. Qg4+ {[%emt 0:02:35]} Kh8 {[%emt 0:00:03]} 20. Qh5 {[%emt 0:00:02]} f5 {[%emt 0:00:04]} 21. g4 {[%emt 0:01:01]} d5 {[%emt 0:02:01]} 22. gxf5 {[%emt 0:00:40]} exf5 {[%emt 0:00:06]} 23. Qh6 {[%emt 0:00:13]} Qd8 {[%emt 0:00:32]} 24. Rhg1 {[%emt 0:00:34]} Bf6 {[%emt 0:00:11]} 25. Rad1 {[%emt 0:00:03]} d4 {[%emt 0:00:38]} 26. Bc1 {[%emt 0:00:19]} Be6 {[%emt 0:00:08]} 27. Rg5 {[%emt 0:00:25]} Qd7 {[%emt 0:00:43]} 28. Re1 {[%emt 0:00:22]} Rbe8 {[%emt 0:00:13]} 29. Bd2 {[%emt 0:00:07]} Bxg5 {[%emt 0:00:11]} 30. fxg5 {[%emt 0:00:01]} Bf7 {[%emt 0:00:15]} 31. Bf4 {[%emt 0:00:12]} Bg6 {[%emt 0:00:05]} 32. h4 {[%emt 0:00:08]} Qf7 {[%emt 0:00:04]} 33. Be5+ {[%emt 0:00:06]} Kg8 {[%emt 0:00:02]} 34. Bf6 {[%emt 0:00:10]} Rxe1 {[%emt 0:00:05]} 35. Kxe1 {[%emt 0:00:01]} Re8+ {[%emt 0:00:06]} 36. Kd2 {[%emt 0:00:01]} f4 {[%emt 0:00:05]} 37. Bf1 {[%emt 0:00:14]} f3 {[%emt 0:00:05]} 38. Kd1 {[%emt 0:00:05]} f2 {[%emt 0:00:03]} 39. c5 {[%emt 0:00:06]} Qb3+ {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "10.9"]
[White "Praggnanandhaa R"]
[Black "Liang, Awonder"]
[Result "1/2-1/2"]
[ECO "A45"]
[WhiteElo "2608"]
[BlackElo "2592"]
[Annotator "TA"]
[PlyCount "100"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,100,33,31,16,28,35,27,23,67,72,87,75,96,61,51,56,38,-5,0,-35,-35,-21,-20,-31,0,0,0,0,0,-11,22,0,22,-64,0,0,-17,-87,-94,-102,-96,-146,-81,-161,-170,-316,-279,-497,-514,-508,-509,-445,-505,-491,-501,-484,-454,-502,-537,-718,-685,-719,-695,-629,-450,-499,-473,-570,-551,-582,-571,-582,-582,-629,-108,-108,-95,-102,-108,-103,-72,-80,-80,-80,-80,-80,-80,-80,0,-80,-80,-89,0]} 1. d4 Nf6 2. Bf4 c5 3. e3 g6 4. c3 Bg7 5. dxc5 O-O 6. Nf3 {A45: Trompowsky Attack.} a5 {[#]} 7. Bb5 $146 ({Predecessor:} 7. Nbd2 Na6 8. Bxa6 Rxa6 9. Be5 b6 10. cxb6 d6 11. Bxf6 Bxf6 12. O-O Rxb6 13. Qc2 {½-½ (56) Tunik,G (2388)-Menac Comas,J (2012) Sabadell 2017}) 7... Na6 8. Qd4 {White has an edge.} Nh5 9. Be5 f6 10. Bg3 e5 11. Qc4+ Kh8 12. Nbd2 b6 13. cxb6 d5 14. Qe2 (14. b7 $5 Bxb7 15. Qe2 $11) 14... Qxb6 15. a4 Nc7 16. c4 dxc4 17. Bxc4 Qxb2 18. O-O Qb4 19. Rfc1 Qe7 20. Rab1 Bd7 21. Bb5 (21. Bh4 $11) 21... Bf5 (21... Nxb5 $15 22. axb5 Nxg3 23. hxg3 Rfc8) 22. e4 Be6 23. Qe3 (23. Bc6 $11 Ra7 24. Qe3) 23... Nxb5 $17 24. Rxb5 Rfb8 25. Rbc5 Rd8 ({Black should play} 25... Qf8 26. Rc7 Bh6) 26. Qc3 (26. h3 $17 {was necessary.}) 26... Rdc8 $19 27. h3 (27. Rxc8+ $142 Rxc8 28. Qb2) 27... Bf8 28. Rc7 {[#]} (28. Rxc8 Rxc8 29. Qa1) 28... Rxc7 29. Qxc7 Rc8 30. Qxc8 Bxc8 31. Rxc8 Kg8 32. Bh2 Qd7 33. Ra8 Qxa4 34. g4 Nf4 35. Bxf4 exf4 36. Kg2 Kf7 37. e5 Be7 38. Ra7 Qb4 39. exf6 Kxf6 40. Ra6+ Kg7 41. Re6 a4 $2 (41... Qb7 $19 {has better winning chances.} 42. Nc4 a4) 42. Re4 $17 Qa3 43. Nb1 Qd6 44. Rxa4 h5 {White must now prevent ...hxg4.} 45. gxh5 gxh5 {[#] aiming for ...Qg6+.} 46. Nbd2 Qg6+ 47. Kf1 Qf5 48. Kg2 Qg6+ 49. Kf1 $1 Qd3+ 50. Kg2 Qg6+ {Weighted Error Value: White=0.30/Black=0.31} ({Better is} 50... Qd6 $17 51. Rc4 Qg6+ 52. Kh2 Qd3) 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "11.2"]
[White "Liang, Awonder"]
[Black "Salimova, Nurgyul"]
[Result "1-0"]
[ECO "C55"]
[WhiteElo "2592"]
[BlackElo "2397"]
[Annotator "ChessBase"]
[PlyCount "67"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:08]} Nc6 {[%emt 0:00:00]} 3. Bc4 {[%emt 0:00:05]} Nf6 {[%emt 0:00:06]} 4. d3 {[%emt 0:00:02]} Be7 {[%emt 0:00:05]} 5. O-O {[%emt 0:00:09]} O-O {[%emt 0:00:08]} 6. a4 {[%emt 0:00:05]} d6 {[%emt 0:00:07]} 7. h3 {[%emt 0:00:02]} h6 {[%emt 0:00:23]} 8. Re1 {[%emt 0:00:12]} Kh8 {[%emt 0:01:06]} 9. c3 {[%emt 0:00:16]} Nh7 {[%emt 0:01:26]} 10. d4 {[%emt 0:02:13]} f5 {[%emt 0:00:33]} 11. Bd5 {[%emt 0:01:27]} exd4 {[%emt 0:02:04]} 12. cxd4 {[%emt 0:00:08]} Nb4 {[%emt 0:00:44]} 13. Nc3 {[%emt 0:00:17]} c6 {[%emt 0:00:16]} 14. Bb3 {[%emt 0:00:03]} fxe4 {[%emt 0:00:05]} 15. Nxe4 {[%emt 0:00:01]} d5 {[%emt 0:00:18]} 16. Ne5 {[%emt 0:00:29]} Kg8 {[%emt 0:01:55]} 17. Bd2 {[%emt 0:00:58]} a5 {[%emt 0:00:18]} 18. Ng3 {[%emt 0:00:17]} Qd6 {[%emt 0:00:19]} 19. Qh5 {[%emt 0:00:22]} Bd7 {[%emt 0:00:34]} 20. Ng6 {[%emt 0:01:28]} Rf7 {[%emt 0:00:12]} 21. Ne4 {[%emt 0:01:43]} Qc7 {[%emt 0:00:12]} 22. Bf4 {[%emt 0:00:01]} Qd8 {[%emt 0:00:12]} 23. Bd6 {[%emt 0:00:15]} Bf6 {[%emt 0:00:26]} 24. Bxb4 {[%emt 0:00:08]} axb4 {[%emt 0:00:02]} 25. Nd6 {[%emt 0:00:01]} Bg4 {[%emt 0:00:23]} 26. Bxd5 {[%emt 0:00:08]} cxd5 {[%emt 0:00:06]} 27. Qxd5 {[%emt 0:00:01]} Ng5 {[%emt 0:00:06]} 28. hxg4 {[%emt 0:00:20]} Kh7 {[%emt 0:00:01]} 29. Qf5 {[%emt 0:00:04]} Kg8 {[%emt 0:00:09]} 30. Nxf7 {[%emt 0:00:10]} Nxf7 {[%emt 0:00:05]} 31. Re6 {[%emt 0:00:05]} Qxd4 {[%emt 0:00:02]} 32. Rae1 {[%emt 0:00:02]} Qd7 {[%emt 0:00:05]} 33. Re7 {[%emt 0:00:08]} Qc6 {[%emt 0:00:12]} 34. Rxf7 {[%emt 0:00:03]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "11.3"]
[White "Yoo, Christopher Woojin"]
[Black "Praggnanandhaa R"]
[Result "0-1"]
[ECO "B33"]
[WhiteElo "2455"]
[BlackElo "2608"]
[Annotator "TA"]
[PlyCount "146"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,146,22,60,43,58,49,50,40,41,35,28,19,55,20,65,58,70,68,66,61,63,74,110,63,64,54,58,-76,-81,-175,-169,-169,-164,-252,-265,-298,-289,-347,-331,-320,-195,-328,-170,-308,-312,-514,-510,-536,-544,-536,-538,-516,-505,-577,-568,-565,-562,-527,-386,-363,-363,-366,-350,-596,-436,-797,-543,-679,-673,-657,-678,-680,-545,-693,-701,-688,-684,-646,-568,-819,-765,-641,-1020,-1007,-986,-1100,-1097,-1049,-984,-1133,-1133,-1126,-1126,-1115,-1100,-1071,-1020,-1056,-1035,-959,-906,-959,-880,-857,-841,-832,-801,-823,-768,-29973,-29974,-29974,-29975,-29975,-29976,-29973,-3093,-2212,-1554,-743,-609,-29981,-29978,-29978,-29977,-29980,-29981,-29981,-29982,-29989,-29990,-29991,-29989,-29990,-29991,-29994,-29994,-29994,-29991]} 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 h5 6. Bg5 {B33: Sicilian: Pelikan and Sveshnikov Variations.} Qa5 7. Bxf6 gxf6 {[#]} 8. Be2 $146 {White is slightly better.} ({Predecessor:} 8. Nb3 Qg5 9. Qd3 e6 10. h4 Qe5 11. Be2 a6 12. O-O-O b5 13. g3 Qc7 14. f4 {½-½ (36) Villalba,M (2258)-Aravindh,C (2641) chess.com INT 2020}) 8... e6 9. Ndb5 Be7 10. a3 (10. Bxh5 $2 a6 $19) 10... a6 {[#]} 11. b4 $1 Qb6 {[#]} (11... Qd8 12. Nd6+) 12. Na4 $1 Qd8 13. Nd6+ Bxd6 14. Qxd6 b5 15. Nc5 Qe7 16. Qc7 Qd8 17. Qg3 d6 18. Qg7 Ke7 $1 $17 {White is on the road to losing.} 19. e5 Nxe5 $19 ({But not} 19... dxc5 $2 20. exf6+ Kd6 21. O-O-O+ (21. Qg3+ e5 $18) 21... Nd4 22. Bf3 $18) 20. Ne4 Nd7 $1 21. Nxd6 (21. Qg3 $142 Qb6 22. Rd1) 21... Kxd6 22. Qxf7 Bb7 23. c4 bxc4 ({Weaker is} 23... Bxg2 24. Rg1 $15) 24. Bxc4 Bd5 ({Inferior is} 24... Bxg2 25. O-O-O+ Kc7 26. Bxe6 $11) 25. Rd1 (25. Bxd5 $142 exd5 26. O-O-O) 25... Qe7 (25... Qg8 $142 26. Qxg8 Rhxg8 27. Bxd5 exd5) 26. Qg6 (26. Qxe7+ $142 Kxe7 27. Bxd5 exd5 28. Rxd5) 26... Ne5 27. Qg3 (27. Qe4 Nxc4 28. Qxc4) 27... Rhg8 28. Qb3 Nxc4 29. Qxc4 Qc7 30. Qf4+ Kd7 31. Rxd5+ exd5 32. Qf5+ Ke7 {Strongly threatening ...Qc1+.} 33. O-O {Threatens to win with Re1+.} Rg7 34. Qxd5 {And now Re1+ would win.} Re8 35. Qxh5 {aiming for Re1+.} Qe5 36. Qh6 $2 (36. Qf3 {is a better defense.}) 36... Kf7 37. h3 (37. Qd2 $142) 37... Qd5 {[%csl Gg7][%cal Rd5g2]} 38. g3 Qg5 39. Qxg5 Rxg5 40. Rd1 Rge5 {Hoping for ...Re1+.} 41. Rd3 a5 42. Kg2 axb4 43. axb4 Rb5 44. Rd4 Reb8 45. h4 Rxb4 46. Rd6 Rb2 47. Rd7+ Kg6 48. Rd4 Rc8 49. Rf4 f5 50. Rd4 Rcc2 51. Rf4 Re2 52. Rf3 Rb4 53. Kf1 Re6 54. Kg2 Ree4 55. Kh3 Kf6 56. Rd3 Ke5 57. Rf3 Re1 58. Kg2 f4 59. g4 Ke4 60. Ra3 f3+ 61. Kh2 Kf4 62. Ra8 Kxg4 (62... Rb2 $142 63. Rf8+ Kxg4 64. Rg8+ Kxh4 65. Rh8+ Kg4 66. Rg8+ Kh5 67. Rh8+ Kg4 68. Rg8+ Kh4 69. Rh8+ Kg5 70. Kg3 Rb3 71. Rg8+ Kf5 72. Rf8+ Kg6 73. Rg8+ Kf6 74. Rf8+ Kg5 75. Rg8+ Kh6 76. Rh8+ Kg7 77. Rc8 Rg1+ 78. Kf4 Rg2 79. Rc2 Kg6 80. Rd2 Kh5 81. Ke5 Re3+ $3 {[%mdl 512]} 82. Kf4 Ra3 83. Kf5 Rg4 84. Ke6 Ra5 85. Kd6 Re4 86. Rd3 Kg4 87. Rd2 Re2 88. Rd4+ Kh5 89. Rf4 Rxf2 90. Ke6 Kg5 91. Rf7 Re2+ 92. Kd6 f2 93. Kc6 Rf5 94. Rg7+ Kf6 95. Rg8 f1=Q 96. Rf8+ Kg7 97. Kd7 Kxf8 98. Kc7 Rb2 99. Kd6 Qc4 100. Kd7 Rd2#) 63. Rg8+ Kh5 64. Rh8+ {[#]} Kg6 $1 {[%cal Rg6g7] ( -> ...Kg7)} 65. Rg8+ Kh7 {Black mates.} 66. Rg5 Rxh4+ 67. Kg3 Rh6 68. Rf5 Kg7 69. Ra5 Rf6 70. Ra7+ Kg6 71. Ra8 Rg1+ 72. Kh4 Kh7 {[%cal Rf6h6]} 73. Ra7+ Rg7 {[%cal Rf6h6] Weighted Error Value: White=0.56/Black=0.19} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "11.4"]
[White "Shuvalova, Polina"]
[Black "Yip, Carissa"]
[Result "1-0"]
[ECO "B08"]
[WhiteElo "2476"]
[BlackElo "2430"]
[Annotator "ChessBase"]
[PlyCount "89"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 2. e4 {[%emt 0:00:39]} Bg7 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:01]} d6 {[%emt 0:00:02]} 4. Be3 {[%emt 0:00:15]} c6 {[%emt 0:00:09]} 5. Nf3 {[%emt 0:00:32]} Nd7 {[%emt 0:00:06]} 6. a4 {[%emt 0:00:10]} Qa5 {[%emt 0:00:25]} 7. Qd2 {[%emt 0:00:06]} Ngf6 {[%emt 0:00:42]} 8. h3 {[%emt 0:00:04]} O-O {[%emt 0:00:19]} 9. Bd3 {[%emt 0:00:15]} e5 {[%emt 0:00:19]} 10. O-O {[%emt 0:00:10]} Re8 {[%emt 0:00:12]} 11. Rfe1 {[%emt 0:00:34]} Nf8 {[%emt 0:00:31]} 12. Rab1 {[%emt 0:00:41]} Qc7 {[%emt 0:00:09]} 13. b4 {[%emt 0:00:37]} Ne6 {[%emt 0:00:19]} 14. dxe5 {[%emt 0:00:11]} dxe5 {[%emt 0:00:01]} 15. Ne2 {[%emt 0:00:03]} Bd7 {[%emt 0:00:28]} 16. c3 {[%emt 0:00:36]} Rad8 {[%emt 0:00:14]} 17. Qc2 {[%emt 0:00:13]} c5 {[%emt 0:00:35]} 18. Ng3 {[%emt 0:00:36]} b6 {[%emt 0:01:15]} 19. Red1 {[%emt 0:01:37]} Bc6 {[%emt 0:00:37]} 20. b5 {[%emt 0:00:13]} Ba8 {[%emt 0:00:05]} 21. Bc4 {[%emt 0:00:14]} Nf4 {[%emt 0:01:02]} 22. Ng5 {[%emt 0:00:17]} Rxd1+ {[%emt 0:00:41]} 23. Rxd1 {[%emt 0:00:00]} Rf8 {[%emt 0:00:01]} 24. Qa2 {[%emt 0:00:24]} Bb7 {[%emt 0:00:25]} 25. a5 {[%emt 0:00:37]} h6 {[%emt 0:00:37]} 26. Nxf7 {[%emt 0:00:16]} Rxf7 {[%emt 0:00:01]} 27. a6 {[%emt 0:00:36]} Bxe4 {[%emt 0:00:09]} 28. Bxf7+ {[%emt 0:00:44]} Qxf7 {[%emt 0:00:01]} 29. Rd8+ {[%emt 0:00:02]} Bf8 {[%emt 0:00:02]} 30. Qxf7+ {[%emt 0:00:01]} Kxf7 {[%emt 0:00:01]} 31. Nxe4 {[%emt 0:00:07]} Nxe4 {[%emt 0:00:02]} 32. Bxf4 {[%emt 0:00:15]} exf4 {[%emt 0:00:02]} 33. Rd7+ {[%emt 0:00:01]} Ke6 {[%emt 0:01:26]} 34. Rxa7 {[%emt 0:00:00]} Nd6 {[%emt 0:00:01]} 35. Ra8 {[%emt 0:00:53]} Nxb5 {[%emt 0:00:48]} 36. Rxf8 {[%emt 0:00:05]} Kd5 {[%emt 0:00:16]} 37. Rxf4 {[%emt 0:00:26]} Kc6 {[%emt 0:00:16]} 38. Rf6+ {[%emt 0:00:23]} Kc7 {[%emt 0:00:02]} 39. c4 {[%emt 0:00:04]} Nd4 {[%emt 0:00:13]} 40. Rxg6 {[%emt 0:00:07]} b5 {[%emt 0:00:03]} 41. cxb5 {[%emt 0:00:05]} Nxb5 {[%emt 0:00:02]} 42. Rxh6 {[%emt 0:00:01]} c4 {[%emt 0:00:02]} 43. Rh4 {[%emt 0:00:03]} c3 {[%emt 0:00:01]} 44. Rc4+ {[%emt 0:00:06]} Kb6 {[%emt 0:00:06]} 45. h4 {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "11.5"]
[White "Bjerre, Jonas Buhl"]
[Black "Lei, Tingjie"]
[Result "1-0"]
[ECO "E04"]
[WhiteElo "2550"]
[BlackElo "2505"]
[Annotator "ChessBase"]
[PlyCount "135"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 4. g3 {[%emt 0:00:00]} dxc4 {[%emt 0:00:11]} 5. Bg2 {[%emt 0:00:05]} Nc6 {[%emt 0:00:03]} 6. Qa4 {[%emt 0:00:33]} Bb4+ {[%emt 0:00:04]} 7. Bd2 {[%emt 0:00:39]} Nd5 {[%emt 0:00:04]} 8. Bxb4 {[%emt 0:00:42]} Ndxb4 {[%emt 0:00:03]} 9. Ne5 {[%emt 0:00:17]} O-O {[%emt 0:02:13]} 10. Nxc6 {[%emt 0:00:06]} Nxc6 {[%emt 0:00:04]} 11. e3 {[%emt 0:00:03]} b5 {[%emt 0:01:20]} 12. Qxb5 {[%emt 0:00:57]} Rb8 {[%emt 0:00:02]} 13. Qa4 {[%emt 0:01:41]} Nb4 {[%emt 0:00:03]} 14. O-O {[%emt 0:00:14]} Bd7 {[%emt 0:00:43]} 15. Qd1 {[%emt 0:00:02]} Qe7 {[%emt 0:03:58]} 16. Na3 {[%emt 0:00:59]} Nd3 {[%emt 0:00:50]} 17. Nxc4 {[%emt 0:00:08]} Nxb2 {[%emt 0:00:02]} 18. Nxb2 {[%emt 0:00:02]} Rxb2 {[%emt 0:00:00]} 19. Qc1 {[%emt 0:00:05]} Qa3 {[%emt 0:00:06]} 20. Qxc7 {[%emt 0:00:58]} Bb5 {[%emt 0:00:03]} 21. Rfb1 {[%emt 0:00:21]} Bd3 {[%emt 0:00:15]} 22. Rxb2 {[%emt 0:00:37]} Qxb2 {[%emt 0:00:05]} 23. Qc1 {[%emt 0:00:10]} Qb4 {[%emt 0:00:46]} 24. Qd1 {[%emt 0:00:23]} Qa3 {[%emt 0:00:29]} 25. Qb3 {[%emt 0:00:44]} Qxb3 {[%emt 0:00:02]} 26. axb3 {[%emt 0:00:02]} Rc8 {[%emt 0:00:27]} 27. d5 {[%emt 0:01:08]} exd5 {[%emt 0:00:05]} 28. Bxd5 {[%emt 0:00:03]} Rc7 {[%emt 0:00:04]} 29. e4 {[%emt 0:00:25]} g5 {[%emt 0:00:13]} 30. f3 {[%emt 0:00:22]} Kg7 {[%emt 0:00:02]} 31. Kf2 {[%emt 0:00:03]} a6 {[%emt 0:00:02]} 32. Ke3 {[%emt 0:00:04]} Bb5 {[%emt 0:00:02]} 33. Kd4 {[%emt 0:00:19]} Rc2 {[%emt 0:00:03]} 34. h4 {[%emt 0:00:07]} gxh4 {[%emt 0:00:05]} 35. gxh4 {[%emt 0:00:03]} Rh2 {[%emt 0:00:08]} 36. Rg1+ {[%emt 0:00:12]} Kf8 {[%emt 0:00:01]} 37. Rg4 {[%emt 0:00:05]} Be8 {[%emt 0:00:16]} 38. e5 {[%emt 0:00:13]} Ke7 {[%emt 0:00:04]} 39. Bc4 {[%emt 0:00:09]} a5 {[%emt 0:00:04]} 40. Rf4 {[%emt 0:00:07]} Rf2 {[%emt 0:00:07]} 41. Kc5 {[%emt 0:00:04]} Rc2 {[%emt 0:00:06]} 42. Kb6 {[%emt 0:00:05]} Rc1 {[%emt 0:00:06]} 43. Kxa5 {[%emt 0:00:03]} Re1 {[%emt 0:00:01]} 44. Rf5 {[%emt 0:00:06]} Rh1 {[%emt 0:00:03]} 45. h5 {[%emt 0:00:02]} Rb1 {[%emt 0:00:10]} 46. Kb4 {[%emt 0:00:03]} Rb2 {[%emt 0:00:01]} 47. Kc5 {[%emt 0:00:04]} Rc2 {[%emt 0:00:03]} 48. h6 {[%emt 0:00:06]} Kd8 {[%emt 0:00:02]} 49. Kb4 {[%emt 0:00:04]} Ke7 {[%emt 0:00:02]} 50. f4 {[%emt 0:00:02]} Rf2 {[%emt 0:00:08]} 51. Rf6 {[%emt 0:00:02]} Rf3 {[%emt 0:00:02]} 52. Kc5 {[%emt 0:00:03]} Rc3 {[%emt 0:00:02]} 53. Kd4 {[%emt 0:00:02]} Rc1 {[%emt 0:00:02]} 54. Bd3 {[%emt 0:00:05]} Rd1 {[%emt 0:00:05]} 55. Kc3 {[%emt 0:00:02]} Rh1 {[%emt 0:00:11]} 56. Bxh7 {[%emt 0:00:04]} Bd7 {[%emt 0:00:02]} 57. Be4 {[%emt 0:00:06]} Rh3+ {[%emt 0:00:02]} 58. Kd4 {[%emt 0:00:09]} Be6 {[%emt 0:00:09]} 59. b4 {[%emt 0:00:03]} Rb3 {[%emt 0:00:03]} 60. Kc5 {[%emt 0:00:07]} Rc3+ {[%emt 0:00:01]} 61. Kb5 {[%emt 0:00:12]} Bd7+ {[%emt 0:00:19]} 62. Kb6 {[%emt 0:00:03]} Be6 {[%emt 0:00:06]} 63. h7 {[%emt 0:00:03]} Rh3 {[%emt 0:00:01]} 64. b5 {[%emt 0:00:06]} Kf8 {[%emt 0:00:03]} 65. f5 {[%emt 0:00:07]} Bd7 {[%emt 0:00:06]} 66. e6 {[%emt 0:00:07]} Be8 {[%emt 0:00:02]} 67. exf7 {[%emt 0:00:02]} Bd7 {[%emt 0:00:04]} 68. Rd6 {[%emt 0:00:04]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "11.6"]
[White "Gukesh D"]
[Black "Badelka, Olga"]
[Result "1-0"]
[ECO "E04"]
[WhiteElo "2578"]
[BlackElo "2433"]
[Annotator "TA"]
[PlyCount "135"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 14,135,8,0,10,0,0,-14,-12,-17,-12,-11,-11,-11,-15,-17,-18,-107,-40,-30,-32,-31,-40,-29,33,0,35,0,0,0,0,0,0,0,0,0,0,-22,216,212,201,212,205,197,197,197,212,212,212,212,259,259,292,268,294,273,290,248,229,226,229,229,211,191,281,258,510,428,646,425,420,401,411,235,29988,806,29989,393,754,393,5043,645,582,395,364,243,250,242,240,168,214,208,193,175,189,178,324,319,288,249,397,290,462,655,479,479,5122,140,383,345,432,289,454,446,460,443,29983,29984,29984,29985,29985,29986,29986,29987]} 1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. g3 dxc4 5. Bg2 c6 6. O-O b5 7. Ne5 Bb7 8. Nc3 a6 {E04: Open Catalan: 5 Nf3.} 9. b3 cxb3 10. Qxb3 $5 {[%mdl 4] Leaves trodden paths.} Qxd4 {The position is equal.} 11. Bf4 Be7 {[#]} 12. Rfd1 $146 ({Predecessor:} 12. a4 b4 13. Rac1 Qa7 14. Nc4 c5 15. Bxb7 Qxb7 16. a5 Nc6 17. Na4 Rd8 18. Rfd1 {0-1 (34) Troff,K (2543)-Nyzhnyk,I (2622) Las Vegas 2016}) 12... Qb4 13. Qc2 $1 O-O 14. Rab1 Qc5 15. Qd3 (15. a4 $1 $11) 15... Nd5 ({Black should try} 15... g5 $1 $17 16. Na4 bxa4 17. Rxb7 gxf4 18. gxf4 h5) 16. Nxd5 $1 $15 cxd5 17. Rbc1 Qb6 18. e4 {[%cal Re4d5]} f6 {[#]} (18... d4 $11 19. Qxd4 Qxd4 20. Rxd4 Rd8) 19. Be3 $1 Qd8 (19... d4 {is more complex.} 20. Bxd4 Qa5 21. Nf3 Nc6 22. Qb3 Nd8) 20. Ng4 {[%cal Re4d5]} (20. Qb3 $5 {[%cal Re4d5]} Kh8 21. exd5 exd5 22. Rxd5 (22. Bxd5 Bxd5 23. Rxd5 Qe8 $11) 22... Bxd5 23. Qxd5 Qxd5 24. Bxd5 $14) 20... Nc6 21. exd5 Nb4 {[%mdl 64] Double Attack} 22. Qe2 Nxd5 {aiming for ...Qd7.} (22... Bxd5 $6 23. a3 $16) 23. Bc5 Bxc5 24. Qxe6+ Kh8 {Threatens to win with ...Re8.} 25. Bxd5 Bc8 (25... Bxd5 $11 26. Rxd5 Qe7 27. Qxe7 Bxe7) 26. Qe2 $18 Bxg4 27. Qxg4 Rc8 {...Bxf2+! is the strong threat.} 28. Be6 $1 {[%csl LRc8,LRd8][%mdl 64] Discovered Attack} Bxf2+ 29. Kxf2 Qb6+ 30. Kg2 Rxc1 31. Rxc1 Qe3 32. Rc2 Re8 33. Bd7 Rf8 34. Qf3 Qd4 35. Bf5 g6 36. Bd3 Rd8 37. Bf1 Qe5 38. Re2 Qd4 (38... Qd5 $142 39. Rc2 Rd6 40. Qxd5 Rxd5) 39. h4 Rf8 $2 (39... Qd6 40. Kh2 Kg7) 40. Qb7 Qa4 (40... Rd8 $142 41. Qxa6 g5 42. hxg5 Qd5+ 43. Kh2 Qxg5) 41. Qe7 {[%cal Re7f8]} Kg8 42. Kh2 {Black must now prevent Bh3.} Qd4 43. Bh3 (43. Qe6+ $142 Rf7 44. Bg2) 43... Rd8 $2 (43... f5 $18 44. Qe6+ Kg7 45. Qxa6 f4 46. Qb7+ (46. Qxb5 $2 fxg3+ {[%mdl 64] Discovered Attack} 47. Kxg3 Qf4+ 48. Kg2 Qf1+ 49. Kh2 Rf2+ 50. Rxf2 Qxb5 $19) 46... Rf7) 44. Be6+ Kh8 45. Bb3 $2 (45. h5 {mates} Rb8 46. h6 Qh4+ 47. gxh4 Rg8 48. Bxg8 Kxg8 49. Qg7#) 45... a5 $2 (45... Qd6 46. Qf7 Rf8) 46. a3 b4 $2 (46... Qd6 47. Qa7 Qd7 48. Qxa5 Qd3) 47. a4 (47. Qf7 $142 g5 48. Bc2) 47... Qd6 {If only Black now had time for ...Qxe7....} 48. Qf7 {White threatens Re7 and mate.} Rf8 49. Qe6 ({Weaker is} 49. Re8 Rxe8 50. Qxe8+ Kg7 $18) 49... Rd8 {If Black can now play ...Qxe6 this consolidates a bit.} 50. Qxd6 Rxd6 {[%mdl 4096] Endgame KRB-KR} 51. Re3 Rd2+ 52. Kh3 Rb2 53. g4 Kg7 54. Kg3 h5 (54... Kf8 $142 55. Rf3 Ke7) 55. gxh5 gxh5 56. Kf3 Kg6 (56... Rh2 {might work better.} 57. Kg3 Rb2) 57. Ke4 Rh2 (57... Rg2 {was worth a try.} 58. Be6 Rg1) 58. Rg3+ Kh6 59. Kf5 Rxh4 (59... Rf2+ $142 60. Ke6 Rf4) 60. Kxf6 $2 (60. Be6 $18 b3 61. Kxf6) 60... Rf4+ {A mistake that costs the game.} (60... Rg4 $16 61. Rh3 Rf4+ 62. Ke5 Rf1) 61. Ke5 Rf2 62. Bd5 h4 (62... Rf8 {keeps fighting.} 63. Bb3 Rf2) 63. Rg8 Kh7 64. Rg4 Rh2 (64... h3 $18 65. Rh4+ Kg6 66. Rxh3 Rf5+ 67. Kd4 Rf1) 65. Be4+ {White mates.} Kh6 66. Kf6 Rf2+ {[#]} 67. Bf5 $1 {[%cal Rg4h4]} Kh5 68. Rg8 {[%cal Rg8h8] Weighted Error Value: White=0.76/Black=0.62} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "11.7"]
[White "Keymer, Vincent"]
[Black "Nihal Sarin"]
[Result "1/2-1/2"]
[ECO "D36"]
[WhiteElo "2591"]
[BlackElo "2620"]
[Annotator "TA"]
[PlyCount "98"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 23,98,50,54,47,41,49,78,22,92,83,49,94,199,210,209,198,189,169,162,177,235,97,94,79,50,70,591,77,62,-91,-94,-191,0,0,0,-184,-12,-75,-72,-116,-117,-203,-201,-201,-184,-207,0,0,0,0,0,0,0,-7,0,0,0,3,62,62,61,59,154,147,146,137,135,0,0,0,0,0,0,0,0,0,0]} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. Bg5 Nbd7 6. cxd5 exd5 7. Qc2 Be7 8. e3 O-O 9. Bd3 Re8 10. h3 Nf8 11. O-O Ng6 12. Ne5 Nd7 13. Bxe7 {D36: Queen's Gambit Declined: Exchange Variation: Main line (5 Bg5 c6 6 Qc2).} Qxe7 14. f4 Ngf8 {[%cal Bg6f8,Bf8e6,Be6f4][%mdl 32]} 15. e4 {[#]} (15. Rae1 $16) 15... Qb4 $146 (15... dxe4 $11 {keeps the balance.} 16. Bc4 (16. Nxe4 Nf6 $11) 16... Nxe5 17. fxe5 Be6 18. Nxe4 Qh4) ({Predecessor:} 15... Nf6 16. exd5 Nxd5 17. Nxd5 cxd5 18. Rae1 Qd8 19. f5 f6 20. Nf3 Bd7 21. Qb3 Bc6 22. Rxe8 Qxe8 23. Re1 Qd7 24. Qa3 Kf7 25. b4 {½-½ (25) Kononenko,T (2305)-Shadrina,T (2401) Vladimir 2004}) 16. Nf3 $16 (16. exd5 $6 Qxd4+ 17. Kh1 Nxe5 $11) 16... dxe4 17. Nxe4 h6 (17... Nb6 $16) 18. Rae1 $18 Ne6 19. a3 Qf8 20. f5 Nf4 21. Bc4 Nb6 (21... Nd5 {might work better.} 22. Qb3 N7b6) 22. Ba2 (22. Ne5 $18 {has better winning chances.} Nxc4 23. Qxc4) 22... Bxf5 $16 {[#]} 23. Nf6+ gxf6 24. Qxf5 {[%mdl 64] Double Attack} Qd6 {[%mdl 8192] [#]} (24... Nbd5 $14) 25. Rxe8+ $2 (25. Bxf7+ $1 $18 {[%mdl 512] is the precise move to win.} Kxf7 26. Ne5+ Rxe5 27. dxe5 Qd4+ 28. Kh1) 25... Rxe8 26. Qg4+ $2 (26. Kh1 $1 $14 {stays ahead.}) 26... Kf8 $17 27. Qh4 (27. Kh1 $17 Ne2 28. Ne5 Qxd4 29. Qxd4 Nxd4 30. Ng4) 27... Kg7 28. Qg4+ Kf8 {...h5 is the strong threat.} 29. Qh4 f5 $2 (29... Ne2+ $19 30. Kf2 f5) 30. Kh1 (30. Ne5 $11 Qxd4+ {[%mdl 64] Double Attack} 31. Kh2 Qxe5 32. Qxh6+ Ke7 33. Qg5+ f6 34. Qxf4) 30... Re4 $1 {aiming for ...Ne2.} 31. Ne5 Ne2 ({But not} 31... Rxd4 $2 32. Nxf7 Nxg2 33. Qh5 $18 (33. Kxg2 Rd2+ 34. Rf2 Rxf2+ 35. Qxf2 Qf6 $18)) 32. Qf2 (32. g4 $17) 32... Qxd4 $19 ({Don't do} 32... Nxd4 33. Nxf7 Qf6 34. Re1 $15) 33. Nxf7 Qxf2 34. Rxf2 Ng3+ $2 (34... Nc1 $19 35. Rxf5 Re1+ 36. Kh2 Nxa2 37. Nd8+ Ke7 38. Nxb7 Nd5) 35. Kh2 $11 f4 36. Nxh6 Nd5 37. Bxd5 cxd5 {[%mdl 4096] Endgame KRN-KRN} 38. Ng4 Ke7 39. Rf3 d4 40. h4 Ke6 (40... Ne2 $11) 41. Nf2 $14 Re3 42. Rxf4 d3 {[#]} ({Black should try} 42... Nf5 $14) 43. Ng4 $1 $16 {[%cal Rg4e3]} Ne2 44. Rf6+ Ke7 {[#] Hoping for ...Rg3.} 45. Rf1 (45. Rf7+ $3 $16 {[%mdl 512]} Kxf7 46. Nxe3) 45... Re4 $11 {The position is equal.} 46. Kh3 Nf4+ (46... d2 $5 47. Rd1 $8 Nf4+ 48. Kh2 Re2 $11) 47. Kh2 Ne2 (47... d2 $5 48. Rd1 $8 Re2 $11) 48. Kh3 Nf4+ (48... d2 $5 49. Rd1 $8 Nf4+ 50. Kh2 Re2 $11) 49. Kh2 Ne2 {A wild game.  Weighted Error Value: White=0.44/Black=0.54} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "11.8"]
[White "Mendonca, Leon Luke"]
[Black "Mammadzada, Gunay"]
[Result "1-0"]
[ECO "D15"]
[WhiteElo "2549"]
[BlackElo "2443"]
[Annotator "ChessBase"]
[PlyCount "51"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:05]} c6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:06]} Nf6 {[%emt 0:00:00]} 4. e3 {[%emt 0:00:45]} Bf5 {[%emt 0:00:04]} 5. Nc3 {[%emt 0:00:03]} a6 {[%emt 0:00:03]} 6. Ne5 {[%emt 0:01:54]} Nbd7 {[%emt 0:00:03]} 7. Qb3 {[%emt 0:00:05]} Qc7 {[%emt 0:00:03]} 8. cxd5 {[%emt 0:00:25]} Nxe5 {[%emt 0:00:05]} 9. dxe5 {[%emt 0:00:01]} Nxd5 {[%emt 0:00:01]} 10. Bc4 {[%emt 0:00:09]} e6 {[%emt 0:00:34]} 11. e4 {[%emt 0:00:09]} Nxc3 {[%emt 0:00:38]} 12. exf5 {[%emt 0:00:04]} Nd5 {[%emt 0:05:22]} 13. O-O {[%emt 0:00:41]} O-O-O {[%emt 0:01:04]} 14. Bg5 {[%emt 0:01:01]} Rd7 {[%emt 0:00:21]} 15. fxe6 {[%emt 0:00:35]} fxe6 {[%emt 0:00:00]} 16. Rac1 {[%emt 0:00:10]} h6 {[%emt 0:00:45]} 17. Be3 {[%emt 0:01:42]} Qxe5 {[%emt 0:01:11]} 18. Rfe1 {[%emt 0:00:33]} Bd6 {[%emt 0:00:51]} 19. g3 {[%emt 0:00:07]} Qf5 {[%emt 0:00:09]} 20. Bxa6 {[%emt 0:01:07]} bxa6 {[%emt 0:00:05]} 21. Rxc6+ {[%emt 0:00:02]} Kd8 {[%emt 0:00:06]} 22. Rxd6 {[%emt 0:00:12]} Rxd6 {[%emt 0:00:08]} 23. Qb8+ {[%emt 0:00:02]} Ke7 {[%emt 0:00:01]} 24. Qxh8 {[%emt 0:00:04]} Kf7 {[%emt 0:00:05]} 25. Bc5 {[%emt 0:00:40]} Rb6 {[%emt 0:00:25]} 26. Qf8+ {[%emt 0:00:08]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "11.9"]
[White "Abdumalik, Zhansaya"]
[Black "Murzin, Volodar"]
[Result "0-1"]
[ECO "B01"]
[WhiteElo "2472"]
[BlackElo "2478"]
[Annotator "ChessBase"]
[PlyCount "56"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 2. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 3. Nd2 {[%emt 0:00:00]} dxe4 {[%emt 0:00:00]} 4. Nxe4 {[%emt 0:00:00]} Bf5 {[%emt 0:00:03]} 5. Ng3 {[%emt 0:00:00]} Bg6 {[%emt 0:00:01]} 6. Nh3 {[%emt 0:00:00]} Nf6 {[%emt 0:01:01]} 7. Nf4 {[%emt 0:00:03]} Nbd7 {[%emt 0:01:15]} 8. c3 {[%emt 0:00:05]} Qc7 {[%emt 0:00:50]} 9. Bc4 {[%emt 0:00:06]} e6 {[%emt 0:00:42]} 10. O-O {[%emt 0:00:28]} Bd6 {[%emt 0:00:04]} 11. Qf3 {[%emt 0:01:19]} O-O-O {[%emt 0:00:31]} 12. a4 {[%emt 0:00:15]} Nb6 {[%emt 0:00:13]} 13. Bb3 {[%emt 0:00:25]} Nbd5 {[%emt 0:00:07]} 14. Nxg6 {[%emt 0:00:40]} hxg6 {[%emt 0:00:06]} 15. a5 {[%emt 0:00:00]} a6 {[%emt 0:00:30]} 16. c4 {[%emt 0:00:27]} Ne7 {[%emt 0:00:07]} 17. d5 {[%emt 0:02:02]} exd5 {[%emt 0:00:22]} 18. cxd5 {[%emt 0:00:01]} Nexd5 {[%emt 0:00:01]} 19. h3 {[%emt 0:00:15]} Bf4 {[%emt 0:00:26]} 20. Ne4 {[%emt 0:00:18]} Nxe4 {[%emt 0:01:33]} 21. Bxd5 {[%emt 0:00:30]} Bh2+ {[%emt 0:01:35]} 22. Kh1 {[%emt 0:00:02]} cxd5 {[%emt 0:00:01]} 23. Be3 {[%emt 0:00:07]} Kb8 {[%emt 0:00:13]} 24. Rfc1 {[%emt 0:02:01]} Qd6 {[%emt 0:00:06]} 25. Qxf7 {[%emt 0:00:41]} Rhf8 {[%emt 0:00:24]} 26. Qxg7 {[%emt 0:00:05]} Be5 {[%emt 0:00:02]} 27. Qh7 {[%emt 0:00:27]} Rh8 {[%emt 0:00:05]} 28. Qf7 {[%emt 0:00:06]} Rdf8 {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "11.10"]
[White "Khademalsharieh, Sarasadat"]
[Black "Abdusattorov, Nodirbek"]
[Result "1/2-1/2"]
[ECO "D41"]
[WhiteElo "2494"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "131"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 26,130,29,0,21,0,18,18,15,0,0,0,0,0,0,0,0,-8,0,-9,-5,-7,-8,-5,-3,-22,-49,-119,-3,-3,-4,-4,-5,-29,0,0,0,0,0,-1,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-7,-8,-9,-10,-12,0,0,0,0,0,-3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c5 5. cxd5 Nxd5 6. e4 Nxc3 7. bxc3 cxd4 8. cxd4 Bb4+ 9. Bd2 Bxd2+ 10. Qxd2 O-O 11. Bc4 Nd7 12. O-O b6 13. Rfe1 Bb7 14. Rad1 Rc8 {D41: Queen's Gambit Declined: Semi-Tarrasch with 5 cxd5.} 15. Bb3 h6 16. Re3 Re8 17. h3 Nf6 {[#]} 18. Rde1 $146 ({Predecessor:} 18. Qe2 Rc7 19. d5 exd5 20. e5 Nh5 21. Rd4 g6 22. Qd2 Qe7 23. Nh2 Qc5 24. Re1 {1-0 (39) Goryachkina,A (2579)-Ju,W (2583) Lausanne 2020}) 18... Qc7 19. a4 Red8 20. Qb2 Qe7 21. Qd2 a5 22. d5 exd5 23. exd5 Qb4 24. Qxb4 axb4 25. Rd1 Bxd5 26. Bxd5 (26. Red3 $15 Rc3 27. Kh2) 26... Nxd5 (26... Rxd5 $17 27. Rb1 Rdc5) 27. Red3 $11 Rc5 28. Rd4 b3 {[#] ...b2 is the strong threat.} 29. Rb1 (29. Nd2 $5 {[%cal Rd2b3]}) 29... Re8 30. Rxb3 {The position is equal.} Re2 31. Rbd3 Nc3 32. Rb4 Ne4 33. Re3 Rxe3 34. fxe3 {[%mdl 4096] Endgame KRN-KRN} Nc3 35. Rxb6 Nxa4 36. Rb8+ Kh7 37. Rb7 Kg6 38. Ra7 {And now Ra6+ would win.} Nc3 39. Ra6+ f6 40. Ra7 h5 41. Nh4+ Kh6 42. Nf3 Nd5 43. e4 Nf4 44. Nh4 g6 45. Ra6 Rc2 46. Rxf6 Kg5 {[%mdl 64] [#] Double Attack} 47. e5 Ne2+ 48. Kh2 $1 Kxh4 {KRN-KR} 49. Rf2 Kg5 {Hoping for ...Nd4.} 50. e6 Rc7 {Threatens to win with ...Nf4.} 51. Rxe2 {aiming for e7. KR-KR} Kf6 52. Kg3 (52. g3 {looks sharper.} Re7 53. Rf2+ Kg7 54. Re2 Kf6) 52... Re7 53. Kh4 (53. h4 {feels hotter.} Rxe6 54. Rxe6+ Kxe6 55. Kf4 Kf6 56. Ke4) 53... Rxe6 54. Rxe6+ Kxe6 {KPP-KPP} 55. Kg5 Kf7 56. Kh6 Kf6 57. g4 hxg4 58. hxg4 {KP-KP} g5 59. Kh5 Kf7 60. Kxg5 {White threatens Kh6 and mate. KP-K} Kg7 61. Kh5 Kh7 62. g5 Kg7 63. g6 Kg8 64. Kh6 {Intending g7 and mate.} Kh8 65. g7+ Kg8 66. Kg6 {Weighted Error Value: White=0.04/Black=0.07} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "12.1"]
[White "Zhu, Jiner"]
[Black "Abdusattorov, Nodirbek"]
[Result "0-1"]
[ECO "B12"]
[WhiteElo "2459"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "58"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,58,25,37,43,39,23,27,17,37,37,50,29,79,79,79,68,93,80,75,42,54,53,50,16,27,17,18,-11,8,0,0,0,0,-650,-72,-75,-69,-842,-831,-29989,-29990,-29991,-1786,-1716,-1628]} 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3 e6 5. Be2 c5 6. Be3 cxd4 7. Nxd4 Ne7 8. O-O {now scores much better than the old 8.Nd2.} Nbc6 9. Bb5 {B12: Caro-Kann: Advance Variation.} Bg6 10. c4 a6 11. cxd5 {White has an edge.} axb5 12. dxc6 bxc6 {[#]} 13. Nc3 $146 ({Predecessor:} 13. Qe2 Nf5 14. Nxc6 Qd7 15. Rc1 Rc8 16. Qf3 Nh4 17. Qg4 Nf5 18. Qf3 Nh4 19. Qg4 Nf5 20. Qf3 Nh4 {½-½ (20) Muminova,N (2312)-Yakubboev,N (2004) Tashkent 2013}) 13... Qd7 14. Rc1 b4 15. Na4 {[#] And now Nb6 would win.} Nd5 16. Nxc6 Rc8 ({But not} 16... Nxe3 $2 17. Qxd7+ Kxd7 18. Nb6+ Ke8 19. fxe3 $18 (19. Nxa8 Nxf1 20. Kxf1 f6 $18)) 17. Nd4 Be7 18. Rxc8+ Qxc8 19. Qc1 O-O 20. Nc6 {Hoping for Nb6.} Bh4 {Strongly threatening ...Qa6.} 21. Qc4 {[#]} Qd7 $1 22. Rc1 (22. Nb6 Nxe3) 22... Nxe3 23. Qxh4 Qd2 {[%cal Rd2c1]} 24. Ne7+ (24. Ra1 $1 $11 {keeps the balance.} Nd5 25. Ne7+ Nxe7 26. Qxe7) 24... Kh8 $17 {[%cal Rd2c1]} 25. Ra1 Nd1 $40 {[%cal Rd2e1][%mdl 1152] Black has strong compensation. Black mounts an attack.} 26. f3 $2 {[%mdl 8192] Loses the game.} ({Don't blunder} 26. Nxg6+ $2 fxg6 27. f3 g5 $19) (26. h3 $15) 26... Bc2 $19 27. b3 g5 28. Qg3 Qe3+ (28... Qd4+ $142 29. Kh1 Qxa1 30. Kg1 Qd4+ 31. Kh1 Nf2+ 32. Qxf2 Qxf2 33. h4 Bd3 34. h5 Bf1 35. Ng6+ fxg6 36. hxg6 Qxg2#) 29. Kh1 Nf2+ {Weighted Error Value: White=1.06/Black=0.34} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "12.2"]
[White "Murzin, Volodar"]
[Black "Khademalsharieh, Sarasadat"]
[Result "1-0"]
[ECO "C78"]
[WhiteElo "2478"]
[BlackElo "2494"]
[Annotator "ChessBase"]
[PlyCount "101"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 4. Ba4 {[%emt 0:00:01]} Nf6 {[%emt 0:00:00]} 5. O-O {[%emt 0:00:01]} b5 {[%emt 0:00:00]} 6. Bb3 {[%emt 0:00:03]} Bc5 {[%emt 0:00:01]} 7. c3 {[%emt 0:00:02]} d6 {[%emt 0:00:01]} 8. d4 {[%emt 0:00:02]} Bb6 {[%emt 0:00:02]} 9. Be3 {[%emt 0:00:02]} Bg4 {[%emt 0:00:36]} 10. Nbd2 {[%emt 0:00:03]} O-O {[%emt 0:00:37]} 11. h3 {[%emt 0:00:06]} Bh5 {[%emt 0:00:37]} 12. dxe5 {[%emt 0:00:05]} Nxe5 {[%emt 0:00:39]} 13. Bxb6 {[%emt 0:00:03]} cxb6 {[%emt 0:00:04]} 14. g4 {[%emt 0:00:03]} Bg6 {[%emt 0:00:14]} 15. Nd4 {[%emt 0:00:06]} Nxe4 {[%emt 0:01:36]} 16. f4 {[%emt 0:00:10]} Qh4 {[%emt 0:00:12]} 17. Nxe4 {[%emt 0:00:06]} Bxe4 {[%emt 0:00:03]} 18. Qe1 {[%emt 0:00:01]} Qxh3 {[%emt 0:01:49]} 19. Qxe4 {[%emt 0:00:03]} Nxg4 {[%emt 0:00:01]} 20. Qg2 {[%emt 0:00:02]} Qxg2+ {[%emt 0:00:03]} 21. Kxg2 {[%emt 0:00:00]} Ne3+ {[%emt 0:00:01]} 22. Kf3 {[%emt 0:00:01]} Nxf1 {[%emt 0:00:01]} 23. Rxf1 {[%emt 0:00:00]} g6 {[%emt 0:00:16]} 24. Rd1 {[%emt 0:00:07]} Rad8 {[%emt 0:00:09]} 25. Nc6 {[%emt 0:00:24]} Rd7 {[%emt 0:00:03]} 26. Nb4 {[%emt 0:00:03]} a5 {[%emt 0:00:58]} 27. Nd5 {[%emt 0:00:02]} Rb7 {[%emt 0:00:03]} 28. f5 {[%emt 0:00:47]} gxf5 {[%emt 0:00:17]} 29. Bc2 {[%emt 0:00:33]} Rc8 {[%emt 0:01:07]} 30. Bxf5 {[%emt 0:00:06]} Rc5 {[%emt 0:00:03]} 31. Be4 {[%emt 0:00:20]} Rb8 {[%emt 0:00:04]} 32. Nf6+ {[%emt 0:00:03]} Kg7 {[%emt 0:00:08]} 33. Nd7 {[%emt 0:00:04]} Rd8 {[%emt 0:00:02]} 34. Rg1+ {[%emt 0:00:34]} Kh8 {[%emt 0:00:08]} 35. Nxc5 {[%emt 0:00:07]} dxc5 {[%emt 0:00:09]} 36. Ke3 {[%emt 0:00:25]} Rd6 {[%emt 0:00:02]} 37. Rg2 {[%emt 0:00:21]} h6 {[%emt 0:00:11]} 38. Kf4 {[%emt 0:01:14]} Rd1 {[%emt 0:00:57]} 39. Ke5 {[%emt 0:00:13]} Re1 {[%emt 0:00:02]} 40. Kd5 {[%emt 0:00:09]} Rf1 {[%emt 0:00:40]} 41. Kc6 {[%emt 0:00:16]} f5 {[%emt 0:00:41]} 42. Bd3 {[%emt 0:00:03]} Ra1 {[%emt 0:00:05]} 43. Bxf5 {[%emt 0:00:44]} Rxa2 {[%emt 0:00:04]} 44. Kxb5 {[%emt 0:00:03]} a4 {[%emt 0:00:02]} 45. Be6 {[%emt 0:00:02]} Ra1 {[%emt 0:00:08]} 46. Kxb6 {[%emt 0:00:01]} Re1 {[%emt 0:00:05]} 47. Bd5 {[%emt 0:00:11]} Rc1 {[%emt 0:00:24]} 48. Kxc5 {[%emt 0:00:21]} a3 {[%emt 0:00:01]} 49. Kb4 {[%emt 0:00:15]} axb2 {[%emt 0:00:07]} 50. Rxb2 {[%emt 0:00:02]} Kg7 {[%emt 0:00:06]} 51. c4 {[%emt 0:00:07]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "12.3"]
[White "Mammadzada, Gunay"]
[Black "Abdumalik, Zhansaya"]
[Result "1-0"]
[ECO "C89"]
[WhiteElo "2443"]
[BlackElo "2472"]
[Annotator "ChessBase"]
[PlyCount "103"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 4. Ba4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. O-O {[%emt 0:00:03]} Be7 {[%emt 0:00:00]} 6. Re1 {[%emt 0:00:01]} b5 {[%emt 0:00:00]} 7. Bb3 {[%emt 0:00:02]} O-O {[%emt 0:00:01]} 8. c3 {[%emt 0:00:10]} d5 {[%emt 0:00:28]} 9. exd5 {[%emt 0:00:04]} Nxd5 {[%emt 0:00:01]} 10. Nxe5 {[%emt 0:00:01]} Nxe5 {[%emt 0:00:01]} 11. Rxe5 {[%emt 0:00:01]} c6 {[%emt 0:00:01]} 12. d3 {[%emt 0:00:01]} Bd6 {[%emt 0:00:10]} 13. Re1 {[%emt 0:00:02]} Bf5 {[%emt 0:00:00]} 14. Qf3 {[%emt 0:00:05]} Qd7 {[%emt 0:00:06]} 15. Bxd5 {[%emt 0:01:28]} cxd5 {[%emt 0:00:02]} 16. Bf4 {[%emt 0:00:04]} Bxf4 {[%emt 0:00:09]} 17. Qxf4 {[%emt 0:00:01]} Bxd3 {[%emt 0:00:03]} 18. Nd2 {[%emt 0:00:03]} d4 {[%emt 0:00:20]} 19. cxd4 {[%emt 0:01:27]} Rad8 {[%emt 0:00:02]} 20. Nf3 {[%emt 0:00:07]} Bc4 {[%emt 0:00:06]} 21. b3 {[%emt 0:01:19]} Bd5 {[%emt 0:00:04]} 22. Rad1 {[%emt 0:00:02]} Qb7 {[%emt 0:00:21]} 23. Re3 {[%emt 0:00:11]} a5 {[%emt 0:00:29]} 24. Nh4 {[%emt 0:00:18]} Rfe8 {[%emt 0:00:36]} 25. Nf5 {[%emt 0:00:22]} Rxe3 {[%emt 0:00:03]} 26. fxe3 {[%emt 0:00:45]} g6 {[%emt 0:01:49]} 27. Rc1 {[%emt 0:00:24]} Qd7 {[%emt 0:00:33]} 28. Qg5 {[%emt 0:01:53]} Re8 {[%emt 0:00:44]} 29. Rf1 {[%emt 0:00:29]} Qd8 {[%emt 0:01:19]} 30. Qxd8 {[%emt 0:01:19]} Rxd8 {[%emt 0:00:01]} 31. Ne7+ {[%emt 0:00:02]} Kg7 {[%emt 0:00:01]} 32. Nxd5 {[%emt 0:00:04]} Rxd5 {[%emt 0:00:00]} 33. Rc1 {[%emt 0:00:05]} a4 {[%emt 0:00:05]} 34. b4 {[%emt 0:00:04]} f5 {[%emt 0:00:14]} 35. Rc5 {[%emt 0:00:42]} Rd7 {[%emt 0:00:07]} 36. Rxb5 {[%emt 0:00:10]} f4 {[%emt 0:00:01]} 37. Kf2 {[%emt 0:00:02]} fxe3+ {[%emt 0:00:33]} 38. Kxe3 {[%emt 0:00:00]} Re7+ {[%emt 0:00:00]} 39. Re5 {[%emt 0:00:01]} Rc7 {[%emt 0:00:01]} 40. Kd3 {[%emt 0:00:19]} Rc1 {[%emt 0:00:04]} 41. Ra5 {[%emt 0:00:06]} Rd1+ {[%emt 0:00:05]} 42. Kc4 {[%emt 0:00:03]} Rd2 {[%emt 0:00:03]} 43. Rxa4 {[%emt 0:00:02]} Rxg2 {[%emt 0:00:00]} 44. b5 {[%emt 0:00:01]} Rxh2 {[%emt 0:00:04]} 45. b6 {[%emt 0:00:05]} Rc2+ {[%emt 0:00:01]} 46. Kb5 {[%emt 0:00:12]} Rc8 {[%emt 0:00:25]} 47. Rc4 {[%emt 0:00:01]} Rb8 {[%emt 0:00:02]} 48. a4 {[%emt 0:00:03]} h5 {[%emt 0:00:01]} 49. a5 {[%emt 0:00:01]} h4 {[%emt 0:00:01]} 50. a6 {[%emt 0:00:01]} h3 {[%emt 0:00:00]} 51. a7 {[%emt 0:00:03]} Rh8 {[%emt 0:00:06]} 52. Rc1 {[%emt 0:00:04]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "12.4"]
[White "Nihal Sarin"]
[Black "Mendonca, Leon Luke"]
[Result "1/2-1/2"]
[ECO "A50"]
[WhiteElo "2620"]
[BlackElo "2549"]
[Annotator "TA"]
[PlyCount "91"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,91,-36,-35,-56,-57,-53,-52,-64,-63,-65,-74,-72,-68,-75,-67,-77,-72,-72,-68,-79,-69,-67,-59,-66,-46,-76,0,0,52,51,52,75,45,33,33,0,0,-77,0,0,0,0,0,0,0,0,0,0,7,7,31,0,47,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. d4 Nf6 2. c4 c6 3. Bf4 Qb6 4. Nc3 Qxb2 {[#]} 5. Bd2 $146 ({Predecessor:} 5. Rc1 d6 6. e4 e5 7. Be3 Ng4 8. Bd2 exd4 9. Na4 Qa3 10. Rb1 c5 11. Bc1 Qxa2 {1-0 (48) Agopov,M (2431)-Solozhenkin,E (2457) Helsinki 2014}) 5... Qb6 6. Nf3 {A50: Queen's Fianchetto Defence (1 d4 Nf6 2 c4 b6).} d6 7. Rb1 Qc7 8. e4 {Black is slightly better.} e5 9. h3 Nbd7 10. Be2 Be7 11. O-O O-O 12. Be3 exd4 13. Nxd4 Re8 14. f4 Bf8 15. Qc2 Nc5 {[%cal Rf6e4]} 16. Bf3 Qe7 {[%cal Rf6e4]} (16... g6 {is interesting.} 17. Rfe1 Nfd7 18. Nb3 b6 19. Bf2 Bh6) 17. Rbe1 Nfxe4 (17... Ncxe4 $2 18. Bf2 $18) (17... Nfd7 $17) 18. Nxc6 $1 $11 bxc6 (18... Qd7 $1 $11 19. Nxe4 bxc6) 19. Bxc5 $14 {[%cal Rf3e4]} dxc5 20. Bxe4 Qd7 21. Bxh7+ Kh8 22. Be4 (22. Rd1 {feels hotter.} Qe7 23. Bd3 Ba6 24. Kh2 Rad8 25. Rfe1) 22... Ba6 23. Qf2 (23. Rd1 $11 {keeps the balance.} Qe6 24. Qa4 Qxc4 25. Qxc4 Bxc4 26. Bxc6 {[%mdl 64] Double Attack}) 23... Qd4 ({Black should play} 23... f5 $17 24. Rd1 Qe6) 24. Bxc6 $11 Rxe1 25. Rxe1 Rc8 26. Bb5 Bxb5 27. Nxb5 Qxc4 28. Nxa7 Ra8 {[#] Threatens to win with ...Qa4.} 29. Nc6 Kg8 (29... Qd5 $5 {[%cal Rd5c6]} 30. Ne7 Qd4 $14) 30. Re2 Qd5 31. Ne5 c4 {The position is equal.} 32. Qf3 Qd1+ 33. Kh2 c3 $1 34. Qxa8 Qxe2 35. Qd5 c2 {[#] ...Qxe5! is the strong threat.} 36. Qxf7+ Kh7 37. Qf5+ Kg8 38. Qe6+ Kh7 39. Qc6 {Strongly threatening Nf3.} Qd1 40. Qg6+ Kg8 $1 ({But not} 40... Kh8 $2 41. Nf7+ Kg8 42. Ng5 $18) 41. Qf7+ Kh7 42. Qf5+ Kg8 43. Qe6+ Kh7 44. Qg6+ Kg8 $1 ({Wrong is} 44... Kh8 $2 45. Nf7+ Kg8 46. Ng5 $18) 45. Qe6+ Kh7 46. Qg6+ {Weighted Error Value: White=0.09/Black=0.08} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "12.5"]
[White "Badelka, Olga"]
[Black "Keymer, Vincent"]
[Result "0-1"]
[ECO "A07"]
[WhiteElo "2433"]
[BlackElo "2591"]
[Annotator "ChessBase"]
[PlyCount "86"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. g3 {[%emt 0:00:00]} Bg4 {[%emt 0:00:00]} 3. Bg2 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 4. h3 {[%emt 0:00:03]} Bh5 {[%emt 0:00:07]} 5. O-O {[%emt 0:00:02]} Nd7 {[%emt 0:00:04]} 6. d4 {[%emt 0:00:02]} Ngf6 {[%emt 0:00:06]} 7. c4 {[%emt 0:00:02]} e6 {[%emt 0:00:03]} 8. cxd5 {[%emt 0:00:05]} exd5 {[%emt 0:00:01]} 9. Nh4 {[%emt 0:00:01]} Bg6 {[%emt 0:00:19]} 10. Nc3 {[%emt 0:00:11]} Be7 {[%emt 0:00:19]} 11. Nxg6 {[%emt 0:00:19]} hxg6 {[%emt 0:00:02]} 12. Bf4 {[%emt 0:00:24]} O-O {[%emt 0:00:12]} 13. Qd2 {[%emt 0:00:29]} Re8 {[%emt 0:00:17]} 14. h4 {[%emt 0:00:11]} Nf8 {[%emt 0:00:07]} 15. Qd3 {[%emt 0:00:47]} a5 {[%emt 0:00:44]} 16. Rad1 {[%emt 0:00:05]} Bd6 {[%emt 0:00:20]} 17. e3 {[%emt 0:02:20]} Be7 {[%emt 0:01:00]} 18. Bf3 {[%emt 0:00:16]} Ne6 {[%emt 0:00:09]} 19. Kg2 {[%emt 0:00:10]} Nxf4+ {[%emt 0:00:50]} 20. exf4 {[%emt 0:00:01]} Qd7 {[%emt 0:00:02]} 21. Rh1 {[%emt 0:00:25]} Qf5 {[%emt 0:00:05]} 22. h5 {[%emt 0:01:26]} Qxd3 {[%emt 0:00:21]} 23. Rxd3 {[%emt 0:00:00]} gxh5 {[%emt 0:00:15]} 24. Bxh5 {[%emt 0:00:03]} g6 {[%emt 0:00:17]} 25. Bd1 {[%emt 0:01:03]} Nd7 {[%emt 0:01:07]} 26. f5 {[%emt 0:01:07]} Bf6 {[%emt 0:01:05]} 27. fxg6 {[%emt 0:00:02]} fxg6 {[%emt 0:00:00]} 28. Ne2 {[%emt 0:00:33]} Nf8 {[%emt 0:00:34]} 29. Kf1 {[%emt 0:01:18]} Ra6 {[%emt 0:00:55]} 30. Rb3 {[%emt 0:00:03]} Re7 {[%emt 0:00:04]} 31. Bc2 {[%emt 0:00:05]} Kg7 {[%emt 0:00:13]} 32. g4 {[%emt 0:00:13]} a4 {[%emt 0:00:49]} 33. Rg3 {[%emt 0:00:04]} Rf7 {[%emt 0:01:46]} 34. Re3 {[%emt 0:00:18]} Rb6 {[%emt 0:00:06]} 35. b3 {[%emt 0:00:04]} axb3 {[%emt 0:00:02]} 36. axb3 {[%emt 0:00:02]} Rb4 {[%emt 0:00:07]} 37. Rd3 {[%emt 0:00:12]} Ne6 {[%emt 0:00:28]} 38. g5 {[%emt 0:00:01]} Bxd4 {[%emt 0:00:03]} 39. Nxd4 {[%emt 0:00:26]} Rxd4 {[%emt 0:00:01]} 40. Rg3 {[%emt 0:00:03]} Rd2 {[%emt 0:00:03]} 41. Bxg6 {[%emt 0:00:14]} Rfxf2+ {[%emt 0:00:10]} 42. Kg1 {[%emt 0:00:01]} Rfe2 {[%emt 0:00:05]} 43. Rh7+ {[%emt 0:00:17]} Kxg6 {[%emt 0:00:03]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "12.6"]
[White "Lei, Tingjie"]
[Black "Gukesh D"]
[Result "1/2-1/2"]
[ECO "B90"]
[WhiteElo "2505"]
[BlackElo "2578"]
[Annotator "ChessBase"]
[PlyCount "107"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:00]} 4. Nxd4 {[%emt 0:00:01]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:01]} a6 {[%emt 0:00:01]} 6. a4 {[%emt 0:00:01]} g6 {[%emt 0:00:18]} 7. Be2 {[%emt 0:00:05]} Bg7 {[%emt 0:00:02]} 8. O-O {[%emt 0:00:03]} O-O {[%emt 0:00:03]} 9. Be3 {[%emt 0:00:05]} Nc6 {[%emt 0:00:29]} 10. Qd2 {[%emt 0:00:18]} Bd7 {[%emt 0:00:09]} 11. f4 {[%emt 0:01:52]} Nxd4 {[%emt 0:00:18]} 12. Bxd4 {[%emt 0:00:04]} Bc6 {[%emt 0:00:01]} 13. Bf3 {[%emt 0:00:03]} Nd7 {[%emt 0:01:15]} 14. Bxg7 {[%emt 0:00:04]} Kxg7 {[%emt 0:00:02]} 15. a5 {[%emt 0:00:21]} b5 {[%emt 0:00:58]} 16. e5 {[%emt 0:02:03]} Rc8 {[%emt 0:01:35]} 17. exd6 {[%emt 0:01:51]} Nf6 {[%emt 0:00:12]} 18. Rad1 {[%emt 0:00:49]} Qxd6 {[%emt 0:02:57]} 19. Qxd6 {[%emt 0:00:46]} exd6 {[%emt 0:00:01]} 20. Rd2 {[%emt 0:00:06]} Rfe8 {[%emt 0:01:08]} 21. Na2 {[%emt 0:01:33]} Bxf3 {[%emt 0:01:07]} 22. Rxf3 {[%emt 0:00:03]} Ne4 {[%emt 0:00:37]} 23. Re2 {[%emt 0:00:21]} Ng5 {[%emt 0:00:03]} 24. Rfe3 {[%emt 0:00:01]} Rxe3 {[%emt 0:00:02]} 25. Rxe3 {[%emt 0:00:01]} Ne6 {[%emt 0:00:02]} 26. Nb4 {[%emt 0:00:05]} Rc4 {[%emt 0:00:23]} 27. c3 {[%emt 0:00:08]} Rxf4 {[%emt 0:00:09]} 28. Rd3 {[%emt 0:00:08]} Re4 {[%emt 0:00:14]} 29. Kf2 {[%emt 0:00:21]} Nc5 {[%emt 0:00:01]} 30. Rd1 {[%emt 0:00:23]} Kf8 {[%emt 0:00:09]} 31. Kf3 {[%emt 0:00:06]} Re6 {[%emt 0:00:01]} 32. Nd5 {[%emt 0:00:09]} Nb3 {[%emt 0:00:08]} 33. Nc7 {[%emt 0:00:25]} Rf6+ {[%emt 0:00:01]} 34. Ke2 {[%emt 0:00:05]} Nxa5 {[%emt 0:00:06]} 35. Nxa6 {[%emt 0:00:02]} Nc4 {[%emt 0:00:02]} 36. b3 {[%emt 0:00:02]} Re6+ {[%emt 0:00:01]} 37. Kf2 {[%emt 0:00:03]} Na5 {[%emt 0:00:17]} 38. b4 {[%emt 0:00:13]} Nc4 {[%emt 0:00:05]} 39. Nc7 {[%emt 0:00:15]} Re5 {[%emt 0:00:04]} 40. Rd4 {[%emt 0:00:02]} Rf5+ {[%emt 0:00:06]} 41. Ke2 {[%emt 0:00:03]} Re5+ {[%emt 0:00:01]} 42. Kf2 {[%emt 0:00:01]} Ne3 {[%emt 0:00:09]} 43. Rxd6 {[%emt 0:00:20]} Ng4+ {[%emt 0:00:01]} 44. Kg3 {[%emt 0:00:01]} h5 {[%emt 0:00:03]} 45. Rd3 {[%emt 0:00:01]} Kg7 {[%emt 0:00:08]} 46. Nd5 {[%emt 0:00:09]} g5 {[%emt 0:00:06]} 47. h3 {[%emt 0:00:02]} Nh6 {[%emt 0:00:01]} 48. Nc7 {[%emt 0:00:07]} Nf5+ {[%emt 0:00:02]} 49. Kf3 {[%emt 0:00:01]} Nh4+ {[%emt 0:00:08]} 50. Kf2 {[%emt 0:00:03]} Rf5+ {[%emt 0:00:07]} 51. Kg1 {[%emt 0:00:04]} Re5 {[%emt 0:00:03]} 52. Kf2 {[%emt 0:00:07]} Rf5+ {[%emt 0:00:10]} 53. Kg1 {[%emt 0:00:02]} Re5 {[%emt 0:00:05]} 54. Kf2 {[%emt 0:00:19]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "12.7"]
[White "Yip, Carissa"]
[Black "Bjerre, Jonas Buhl"]
[Result "0-1"]
[ECO "B90"]
[WhiteElo "2430"]
[BlackElo "2550"]
[Annotator "ChessBase"]
[PlyCount "56"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:02]} cxd4 {[%emt 0:00:00]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:01]} a6 {[%emt 0:00:00]} 6. Be3 {[%emt 0:00:01]} e5 {[%emt 0:00:04]} 7. Nf3 {[%emt 0:00:01]} Be7 {[%emt 0:00:02]} 8. Bc4 {[%emt 0:00:03]} O-O {[%emt 0:00:02]} 9. O-O {[%emt 0:00:03]} Nc6 {[%emt 0:00:02]} 10. Re1 {[%emt 0:00:13]} Be6 {[%emt 0:00:34]} 11. Bxe6 {[%emt 0:01:18]} fxe6 {[%emt 0:00:02]} 12. Ng5 {[%emt 0:00:01]} Qd7 {[%emt 0:00:24]} 13. Na4 {[%emt 0:00:16]} Bd8 {[%emt 0:00:23]} 14. Nb6 {[%emt 0:00:02]} Bxb6 {[%emt 0:00:04]} 15. Bxb6 {[%emt 0:00:00]} Ne7 {[%emt 0:00:50]} 16. c3 {[%emt 0:00:15]} h6 {[%emt 0:00:20]} 17. Nf3 {[%emt 0:00:02]} Ng6 {[%emt 0:00:42]} 18. Be3 {[%emt 0:00:13]} Nxe4 {[%emt 0:01:36]} 19. Bxh6 {[%emt 0:01:34]} Nxf2 {[%emt 0:01:14]} 20. Qc2 {[%emt 0:00:05]} e4 {[%emt 0:00:41]} 21. Kxf2 {[%emt 0:00:12]} d5 {[%emt 0:01:02]} 22. Rxe4 {[%emt 0:00:58]} dxe4 {[%emt 0:00:13]} 23. Qxe4 {[%emt 0:00:01]} Rf5 {[%emt 0:00:24]} 24. Be3 {[%emt 0:00:38]} Ne5 {[%emt 0:00:17]} 25. Bd4 {[%emt 0:00:48]} Nxf3 {[%emt 0:00:18]} 26. gxf3 {[%emt 0:00:00]} Raf8 {[%emt 0:00:15]} 27. Rg1 {[%emt 0:00:02]} e5 {[%emt 0:00:21]} 28. Be3 {[%emt 0:01:07]} Rxf3+ {[%emt 0:00:23]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "12.8"]
[White "Praggnanandhaa R"]
[Black "Shuvalova, Polina"]
[Result "1-0"]
[ECO "E17"]
[WhiteElo "2608"]
[BlackElo "2476"]
[Annotator "TA"]
[PlyCount "77"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 24,77,8,-5,27,27,28,30,39,20,29,35,31,31,22,28,49,54,54,57,46,49,86,52,52,55,51,54,222,230,218,214,244,245,239,243,240,248,243,209,216,206,340,316,739,701,716,722,643,493,556,505,1191,1068,1293,1214]} 1. Nf3 Nf6 2. g3 d5 3. Bg2 e6 4. O-O Be7 5. c4 O-O 6. b3 b6 7. Bb2 Bb7 8. cxd5 Nxd5 9. d4 Nf6 10. Na3 Nbd7 {[%cal Bb8d7,Bd7c5,Bc5d3][%mdl 32]} 11. Rc1 c5 12. Nc4 Rc8 13. e3 {13.Re1 is a critical line.} cxd4 {E17: Queen's Indian: 4 g3 Bb7 5 Bg2 Be7.} 14. Nxd4 Bxg2 15. Kxg2 Nc5 {White has an edge.} 16. Qf3 Nd3 17. Nc6 Rxc6 18. Qxc6 {[#] Strongly threatening Rcd1.} Nxc1 19. Rxc1 Qd5+ 20. Qxd5 Nxd5 {[#]} 21. Ne5 $146 ({Predecessor:} 21. e4 Nf6 22. Kf3 Rc8 23. Ne5 Rxc1 24. Bxc1 Bc5 25. Be3 Bxe3 26. Kxe3 Kf8 27. Kd4 Ke8 28. b4 {1-0 (50) Abramovic,B (2375)-Konstantinov,A (2091) Paracin 2019}) 21... Bd6 22. Nc6 a5 23. Bd4 f5 $1 24. f3 Ba3 25. Rc2 Bc5 $2 {[#] A mistake that costs the game.} (25... b5 $14) 26. Bxc5 $18 bxc5 27. Rxc5 {[%mdl 4096] Endgame KRN-KRN} a4 28. bxa4 Nxe3+ 29. Kf2 Nd5 30. a5 Ra8 31. Ke2 Kf7 32. Kd3 Ra6 (32... Ke8 $142 33. Kc4 Kd7 34. Ne5+ Kd6) 33. Kc4 Kf6 $2 (33... Ra8 34. Rb5 g5) 34. Nb4 {White is clearly winning.} Nxb4 35. Kxb4 Ra8 36. f4 Rb8+ 37. Rb5 Rd8 (37... Ra8 $142 38. Rb6 Ke7) 38. a6 Rd2 39. a4 {Weighted Error Value: White=0.19/Black=0.27} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "12.9"]
[White "Salimova, Nurgyul"]
[Black "Yoo, Christopher Woojin"]
[Result "1/2-1/2"]
[ECO "E06"]
[WhiteElo "2397"]
[BlackElo "2455"]
[Annotator "ChessBase"]
[PlyCount "78"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. c4 {[%emt 0:00:10]} d5 {[%emt 0:00:02]} 4. g3 {[%emt 0:00:03]} Be7 {[%emt 0:00:04]} 5. Bg2 {[%emt 0:00:02]} O-O {[%emt 0:00:01]} 6. Nc3 {[%emt 0:00:01]} dxc4 {[%emt 0:01:19]} 7. Ne5 {[%emt 0:00:03]} c5 {[%emt 0:00:17]} 8. dxc5 {[%emt 0:00:21]} Qc7 {[%emt 0:01:14]} 9. Nxc4 {[%emt 0:00:22]} Qxc5 {[%emt 0:00:11]} 10. Qb3 {[%emt 0:02:10]} Nc6 {[%emt 0:00:46]} 11. Be3 {[%emt 0:00:18]} Qh5 {[%emt 0:00:06]} 12. h3 {[%emt 0:00:29]} e5 {[%emt 0:01:29]} 13. g4 {[%emt 0:00:14]} Qh4 {[%emt 0:00:04]} 14. Nd2 {[%emt 0:01:47]} Nd4 {[%emt 0:00:46]} 15. Bxd4 {[%emt 0:00:28]} exd4 {[%emt 0:00:06]} 16. Nf3 {[%emt 0:00:04]} Qh6 {[%emt 0:00:18]} 17. g5 {[%emt 0:00:20]} Qg6 {[%emt 0:00:12]} 18. gxf6 {[%emt 0:00:29]} Be6 {[%emt 0:00:18]} 19. Nd5 {[%emt 0:01:49]} Bd6 {[%emt 0:01:20]} 20. Kf1 {[%emt 0:00:29]} Qe4 {[%emt 0:01:11]} 21. Nd2 {[%emt 0:01:04]} Qh4 {[%emt 0:00:16]} 22. Qf3 {[%emt 0:00:11]} g6 {[%emt 0:00:33]} 23. Rd1 {[%emt 0:00:22]} Kh8 {[%emt 0:00:14]} 24. Qe4 {[%emt 0:00:12]} Qh5 {[%emt 0:00:38]} 25. Nf4 {[%emt 0:00:17]} Bxf4 {[%emt 0:00:14]} 26. Qxf4 {[%emt 0:00:00]} d3 {[%emt 0:00:11]} 27. Qf3 {[%emt 0:00:14]} dxe2+ {[%emt 0:00:06]} 28. Qxe2 {[%emt 0:00:01]} Qf5 {[%emt 0:00:03]} 29. Qf3 {[%emt 0:00:16]} Qc2 {[%emt 0:00:07]} 30. Ne4 {[%emt 0:00:07]} Bc4+ {[%emt 0:00:09]} 31. Kg1 {[%emt 0:00:02]} Be2 {[%emt 0:00:02]} 32. Qf4 {[%emt 0:00:04]} Qxd1+ {[%emt 0:00:05]} 33. Kh2 {[%emt 0:00:01]} Qd4 {[%emt 0:00:11]} 34. Qh6 {[%emt 0:00:07]} Rg8 {[%emt 0:00:02]} 35. Ng5 {[%emt 0:00:05]} Qf4+ {[%emt 0:00:08]} 36. Kg1 {[%emt 0:00:00]} Qc1+ {[%emt 0:00:04]} 37. Kh2 {[%emt 0:00:01]} Qf4+ {[%emt 0:00:01]} 38. Kg1 {[%emt 0:00:01]} Qc1+ {[%emt 0:00:01]} 39. Kh2 {[%emt 0:00:01]} Qf4+ {[%emt 0:00:03]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "13.1"]
[White "Liang, Awonder"]
[Black "Zhu, Jiner"]
[Result "1-0"]
[ECO "D40"]
[WhiteElo "2592"]
[BlackElo "2459"]
[Annotator "ChessBase"]
[PlyCount "93"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. c4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nc3 {[%emt 0:00:00]} e6 {[%emt 0:00:04]} 3. Nf3 {[%emt 0:00:02]} d5 {[%emt 0:00:12]} 4. e3 {[%emt 0:00:02]} c5 {[%emt 0:00:18]} 5. d4 {[%emt 0:00:04]} Nc6 {[%emt 0:00:08]} 6. a3 {[%emt 0:00:01]} a6 {[%emt 0:00:30]} 7. dxc5 {[%emt 0:00:08]} Bxc5 {[%emt 0:00:02]} 8. b4 {[%emt 0:00:04]} Ba7 {[%emt 0:00:10]} 9. Bb2 {[%emt 0:00:03]} O-O {[%emt 0:00:05]} 10. Qc2 {[%emt 0:00:03]} Qe7 {[%emt 0:00:30]} 11. Be2 {[%emt 0:01:03]} h6 {[%emt 0:00:23]} 12. O-O {[%emt 0:00:08]} dxc4 {[%emt 0:00:25]} 13. Bxc4 {[%emt 0:00:02]} b5 {[%emt 0:01:02]} 14. Ba2 {[%emt 0:00:15]} Bb7 {[%emt 0:00:07]} 15. Rac1 {[%emt 0:00:08]} Rac8 {[%emt 0:00:24]} 16. Bb1 {[%emt 0:00:32]} Rfd8 {[%emt 0:01:47]} 17. Rfd1 {[%emt 0:00:30]} Rxd1+ {[%emt 0:00:11]} 18. Rxd1 {[%emt 0:00:02]} Bb8 {[%emt 0:00:27]} 19. Ne4 {[%emt 0:01:00]} Nxe4 {[%emt 0:00:03]} 20. Qxe4 {[%emt 0:00:01]} f5 {[%emt 0:00:01]} 21. Qd3 {[%emt 0:00:04]} Rd8 {[%emt 0:00:06]} 22. Qe2 {[%emt 0:00:02]} Rxd1+ {[%emt 0:00:03]} 23. Qxd1 {[%emt 0:00:00]} Qd6 {[%emt 0:00:14]} 24. Qc2 {[%emt 0:00:23]} Qd5 {[%emt 0:00:59]} 25. e4 {[%emt 0:01:24]} fxe4 {[%emt 0:00:07]} 26. Qxe4 {[%emt 0:00:00]} Qd1+ {[%emt 0:00:36]} 27. Qe1 {[%emt 0:00:27]} Qxe1+ {[%emt 0:00:06]} 28. Nxe1 {[%emt 0:00:00]} Ne5 {[%emt 0:00:21]} 29. f3 {[%emt 0:01:03]} Ba7+ {[%emt 0:00:16]} 30. Kf1 {[%emt 0:00:09]} Nc4 {[%emt 0:00:01]} 31. Bc1 {[%emt 0:00:04]} Be3 {[%emt 0:00:33]} 32. Bxe3 {[%emt 0:00:08]} Nxe3+ {[%emt 0:00:00]} 33. Ke2 {[%emt 0:00:01]} Nc4 {[%emt 0:00:01]} 34. Nc2 {[%emt 0:00:02]} Bd5 {[%emt 0:00:41]} 35. Kd3 {[%emt 0:00:48]} Kf7 {[%emt 0:00:05]} 36. Ne3 {[%emt 0:02:00]} Nxa3 {[%emt 0:00:16]} 37. Nxd5 {[%emt 0:00:01]} exd5 {[%emt 0:00:03]} 38. Ba2 {[%emt 0:00:02]} Ke6 {[%emt 0:00:07]} 39. f4 {[%emt 0:00:22]} Kd6 {[%emt 0:00:19]} 40. h4 {[%emt 0:00:29]} Nc4 {[%emt 0:00:16]} 41. Kd4 {[%emt 0:00:09]} Na3 {[%emt 0:00:04]} 42. Bb3 {[%emt 0:00:16]} Nc4 {[%emt 0:00:03]} 43. g4 {[%emt 0:00:03]} Nb6 {[%emt 0:00:14]} 44. f5 {[%emt 0:00:21]} Nc4 {[%emt 0:00:15]} 45. g5 {[%emt 0:00:06]} Nb6 {[%emt 0:00:34]} 46. f6 {[%emt 0:00:04]} gxf6 {[%emt 0:00:28]} 47. gxh6 {[%emt 0:00:02]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "13.3"]
[White "Shuvalova, Polina"]
[Black "Salimova, Nurgyul"]
[Result "0-1"]
[ECO "E05"]
[WhiteElo "2476"]
[BlackElo "2397"]
[Annotator "ChessBase"]
[PlyCount "98"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:02]} d5 {[%emt 0:00:04]} 4. g3 {[%emt 0:00:03]} Be7 {[%emt 0:00:03]} 5. Bg2 {[%emt 0:00:02]} O-O {[%emt 0:00:02]} 6. O-O {[%emt 0:00:00]} dxc4 {[%emt 0:00:01]} 7. Ne5 {[%emt 0:00:04]} Nc6 {[%emt 0:00:22]} 8. Bxc6 {[%emt 0:00:03]} bxc6 {[%emt 0:00:02]} 9. Nxc6 {[%emt 0:00:00]} Qe8 {[%emt 0:00:03]} 10. Nxe7+ {[%emt 0:00:02]} Qxe7 {[%emt 0:00:01]} 11. Nc3 {[%emt 0:00:05]} c5 {[%emt 0:01:38]} 12. dxc5 {[%emt 0:00:04]} Qxc5 {[%emt 0:00:08]} 13. Be3 {[%emt 0:00:02]} Qh5 {[%emt 0:00:36]} 14. f3 {[%emt 0:00:31]} e5 {[%emt 0:00:45]} 15. Qa4 {[%emt 0:04:16]} Bh3 {[%emt 0:01:29]} 16. Rf2 {[%emt 0:00:37]} Be6 {[%emt 0:00:18]} 17. Qa5 {[%emt 0:00:58]} Rab8 {[%emt 0:00:45]} 18. Rd1 {[%emt 0:00:23]} Rxb2 {[%emt 0:01:25]} 19. Rd8 {[%emt 0:00:50]} Rb8 {[%emt 0:00:19]} 20. Rxb8 {[%emt 0:00:05]} Rxb8 {[%emt 0:00:02]} 21. Qxa7 {[%emt 0:00:29]} Rc8 {[%emt 0:00:16]} 22. Qa5 {[%emt 0:00:13]} Nd7 {[%emt 0:01:23]} 23. Rf1 {[%emt 0:00:11]} Qg6 {[%emt 0:00:07]} 24. Rc1 {[%emt 0:01:00]} h5 {[%emt 0:00:17]} 25. Nd5 {[%emt 0:00:19]} Bxd5 {[%emt 0:00:26]} 26. Qxd5 {[%emt 0:00:00]} Qc6 {[%emt 0:00:15]} 27. Qxc6 {[%emt 0:00:22]} Rxc6 {[%emt 0:00:00]} 28. a4 {[%emt 0:00:13]} f6 {[%emt 0:00:08]} 29. a5 {[%emt 0:00:27]} Kf7 {[%emt 0:00:04]} 30. Ra1 {[%emt 0:00:12]} Nb8 {[%emt 0:00:01]} 31. Kf2 {[%emt 0:00:24]} Ke6 {[%emt 0:00:04]} 32. Ke1 {[%emt 0:00:07]} Na6 {[%emt 0:00:16]} 33. Kd2 {[%emt 0:00:01]} Nb4 {[%emt 0:00:13]} 34. Ra3 {[%emt 0:00:17]} Nd5 {[%emt 0:00:14]} 35. Bf2 {[%emt 0:00:06]} Nc7 {[%emt 0:00:41]} 36. Ra4 {[%emt 0:00:09]} f5 {[%emt 0:00:08]} 37. e4 {[%emt 0:00:05]} fxe4 {[%emt 0:00:01]} 38. fxe4 {[%emt 0:00:00]} Kd7 {[%emt 0:00:14]} 39. Be3 {[%emt 0:00:04]} Kc8 {[%emt 0:00:06]} 40. Kc3 {[%emt 0:00:06]} Nb5+ {[%emt 0:00:02]} 41. Kb4 {[%emt 0:00:10]} Nd6 {[%emt 0:00:17]} 42. a6 {[%emt 0:00:02]} Kb8 {[%emt 0:00:03]} 43. a7+ {[%emt 0:00:05]} Ka8 {[%emt 0:00:01]} 44. Ra1 {[%emt 0:00:21]} c3 {[%emt 0:00:07]} 45. Rc1 {[%emt 0:00:07]} Nxe4 {[%emt 0:00:05]} 46. Kb5 {[%emt 0:00:03]} Rc8 {[%emt 0:00:05]} 47. Rc2 {[%emt 0:00:06]} Nd6+ {[%emt 0:00:04]} 48. Kb4 {[%emt 0:00:02]} Nf5 {[%emt 0:00:05]} 49. Bf2 {[%emt 0:00:17]} Ne7 {[%emt 0:00:08]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "13.4"]
[White "Bjerre, Jonas Buhl"]
[Black "Praggnanandhaa R"]
[Result "0-1"]
[ECO "E94"]
[WhiteElo "2550"]
[BlackElo "2608"]
[Annotator "TA"]
[PlyCount "64"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 18,64,96,62,100,50,48,26,47,18,14,14,10,0,0,-41,-12,-36,-32,0,-41,-71,-68,-60,-63,-55,0,-161,-134,-257,-232,-285,-301,-307,-268,-267,-270,-258,-254,-898,-885,-2199,-2086,-29985,-29986,-29986,-29987,-29986,-29987]} 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Nbd7 7. O-O e5 8. Be3 c6 9. d5 c5 10. Ne1 Kh8 {E94: King's Indian: Classical: 6 Be2 e5 7 0-0: Various Black 7th moves.} 11. g4 Ng8 12. Qd2 f5 {aiming for ...f4.White has an edge.} 13. gxf5 gxf5 14. exf5 Ne7 15. Kh1 {[#]} Nf6 $146 ({Predecessor:} 15... Nxf5 16. Bg5 Bf6 17. Ne4 Bxg5 18. Nxg5 Nf6 19. Bd3 Qe7 20. f3 Nh5 21. Ng2 Nf4 22. Nxf4 Qxg5 {0-1 (22) Jaeger,F (2020)-Ostenstad,B (2465) Harstad 1997}) 16. Bd3 Bxf5 17. Rg1 e4 18. Be2 Ng6 19. Rg5 {[#]} Qd7 20. Nc2 Rf7 21. Rag1 Raf8 (21... Ne5 $1 $15) 22. Qe1 $2 {[#]} (22. Ne1 $1 $11 {and White is okay.}) 22... Ne5 $1 $19 23. Qf1 (23. Nb5 $17 {was called for.} Ne8 24. Qd2) 23... Nf3 24. Bxf3 exf3 25. Ne1 Ng4 26. Bf4 ({Avoid the trap} 26. Nxf3 $2 Bxc3 27. Qc1 Bf6 $19) 26... Bd4 27. Bg3 {intending Nb5.} Rf6 28. Nxf3 $2 (28. a4) 28... Bxc3 29. Nh4 Be4+ 30. f3 Rxf3 {Black mates.} 31. Nxf3 Rxf3 {[%cal Rf3f1]} 32. Qg2 {[#]} Rxg3 $1 {[%cal Rg4f2][%mdl 512] Weighted Error Value: White=1.08/Black=0.06} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "13.5"]
[White "Gukesh D"]
[Black "Yip, Carissa"]
[Result "0-1"]
[ECO "C90"]
[WhiteElo "2578"]
[BlackElo "2430"]
[Annotator "ChessBase"]
[PlyCount "124"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:02]} a6 {[%emt 0:00:00]} 4. Ba4 {[%emt 0:00:01]} Nf6 {[%emt 0:00:01]} 5. O-O {[%emt 0:00:07]} Be7 {[%emt 0:00:02]} 6. d3 {[%emt 0:01:04]} b5 {[%emt 0:00:32]} 7. Bb3 {[%emt 0:00:02]} d6 {[%emt 0:00:01]} 8. c3 {[%emt 0:00:27]} O-O {[%emt 0:00:06]} 9. Nbd2 {[%emt 0:00:02]} Na5 {[%emt 0:00:07]} 10. Bc2 {[%emt 0:00:01]} c5 {[%emt 0:00:01]} 11. Re1 {[%emt 0:00:02]} Re8 {[%emt 0:00:08]} 12. Nf1 {[%emt 0:00:03]} Bf8 {[%emt 0:00:02]} 13. Ng3 {[%emt 0:00:03]} g6 {[%emt 0:00:01]} 14. h3 {[%emt 0:00:12]} Bg7 {[%emt 0:00:02]} 15. Bg5 {[%emt 0:00:02]} h6 {[%emt 0:00:13]} 16. Be3 {[%emt 0:00:02]} Bb7 {[%emt 0:00:14]} 17. Qd2 {[%emt 0:00:36]} Kh7 {[%emt 0:00:02]} 18. b4 {[%emt 0:00:03]} cxb4 {[%emt 0:00:12]} 19. cxb4 {[%emt 0:00:02]} Nc6 {[%emt 0:00:00]} 20. Bb3 {[%emt 0:00:19]} d5 {[%emt 0:01:26]} 21. Bc5 {[%emt 0:01:19]} Qd7 {[%emt 0:00:23]} 22. exd5 {[%emt 0:03:03]} Nxd5 {[%emt 0:00:03]} 23. Ne4 {[%emt 0:00:01]} Nf4 {[%emt 0:03:01]} 24. d4 {[%emt 0:00:05]} Rad8 {[%emt 0:01:14]} 25. d5 {[%emt 0:02:02]} Ne7 {[%emt 0:01:59]} 26. Bb6 {[%emt 0:01:17]} Rc8 {[%emt 0:01:00]} 27. Nc5 {[%emt 0:00:08]} Rxc5 {[%emt 0:00:07]} 28. Bxc5 {[%emt 0:00:05]} Nexd5 {[%emt 0:00:02]} 29. Rad1 {[%emt 0:00:38]} Qf5 {[%emt 0:00:46]} 30. Bxd5 {[%emt 0:00:10]} Bxd5 {[%emt 0:00:02]} 31. Re3 {[%emt 0:00:01]} Nxh3+ {[%emt 0:00:15]} 32. Kf1 {[%emt 0:00:14]} Bc4+ {[%emt 0:00:04]} 33. Ke1 {[%emt 0:00:13]} Nf4 {[%emt 0:00:01]} 34. Nh4 {[%emt 0:00:11]} Qg4 {[%emt 0:00:06]} 35. Qd7 {[%emt 0:00:06]} Qxh4 {[%emt 0:00:34]} 36. g3 {[%emt 0:00:01]} Ng2+ {[%emt 0:00:03]} 37. Kd2 {[%emt 0:00:00]} Qd8 {[%emt 0:00:03]} 38. Rd3 {[%emt 0:00:15]} Bxd3 {[%emt 0:00:04]} 39. Qxd3 {[%emt 0:00:02]} Qxd3+ {[%emt 0:00:10]} 40. Kxd3 {[%emt 0:00:01]} Rd8+ {[%emt 0:00:05]} 41. Ke2 {[%emt 0:00:00]} Rxd1 {[%emt 0:00:00]} 42. Kxd1 {[%emt 0:00:02]} h5 {[%emt 0:00:03]} 43. Ke2 {[%emt 0:00:00]} h4 {[%emt 0:00:02]} 44. Kf1 {[%emt 0:00:04]} h3 {[%emt 0:00:02]} 45. f3 {[%emt 0:00:09]} f5 {[%emt 0:00:04]} 46. Kg1 {[%emt 0:00:04]} f4 {[%emt 0:00:02]} 47. Kh2 {[%emt 0:00:01]} fxg3+ {[%emt 0:00:02]} 48. Kxh3 {[%emt 0:00:01]} Nf4+ {[%emt 0:00:03]} 49. Kxg3 {[%emt 0:00:00]} g5 {[%emt 0:00:02]} 50. Kg4 {[%emt 0:00:03]} Kg6 {[%emt 0:00:01]} 51. Be7 {[%emt 0:00:01]} Bf6 {[%emt 0:00:01]} 52. Bc5 {[%emt 0:00:01]} Nd3 {[%emt 0:00:05]} 53. Bd6 {[%emt 0:00:03]} Nc1 {[%emt 0:00:03]} 54. a3 {[%emt 0:00:01]} Ne2 {[%emt 0:00:03]} 55. Bc5 {[%emt 0:00:02]} Nd4 {[%emt 0:00:02]} 56. Kg3 {[%emt 0:00:05]} Nc2 {[%emt 0:00:01]} 57. Kg4 {[%emt 0:00:02]} Nxa3 {[%emt 0:00:01]} 58. Bd6 {[%emt 0:00:00]} Nc2 {[%emt 0:00:02]} 59. Bc5 {[%emt 0:00:00]} Bg7 {[%emt 0:00:05]} 60. Bd6 {[%emt 0:00:02]} Ne3+ {[%emt 0:00:01]} 61. Kh3 {[%emt 0:00:01]} Kf5 {[%emt 0:00:03]} 62. Bc5 {[%emt 0:00:03]} Nd5 {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "13.6"]
[White "Keymer, Vincent"]
[Black "Lei, Tingjie"]
[Result "1-0"]
[ECO "A13"]
[WhiteElo "2591"]
[BlackElo "2505"]
[Annotator "ChessBase"]
[PlyCount "107"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. e3 {[%emt 0:00:00]} Nf6 {[%emt 0:00:01]} 3. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:04]} 4. Nc3 {[%emt 0:00:01]} Be7 {[%emt 0:00:09]} 5. b3 {[%emt 0:00:02]} O-O {[%emt 0:00:06]} 6. Bb2 {[%emt 0:00:01]} dxc4 {[%emt 0:00:03]} 7. Bxc4 {[%emt 0:00:05]} a6 {[%emt 0:00:02]} 8. a4 {[%emt 0:00:02]} c5 {[%emt 0:00:31]} 9. O-O {[%emt 0:01:46]} Nc6 {[%emt 0:00:25]} 10. Ne2 {[%emt 0:00:08]} Bd7 {[%emt 0:00:50]} 11. Qb1 {[%emt 0:00:47]} h6 {[%emt 0:02:49]} 12. Rd1 {[%emt 0:01:17]} Na5 {[%emt 0:00:42]} 13. Ng3 {[%emt 0:00:22]} b5 {[%emt 0:00:14]} 14. axb5 {[%emt 0:00:02]} axb5 {[%emt 0:00:07]} 15. Be2 {[%emt 0:00:05]} Bc6 {[%emt 0:01:27]} 16. e4 {[%emt 0:00:22]} Qb6 {[%emt 0:00:29]} 17. Qc2 {[%emt 0:00:24]} Rfc8 {[%emt 0:00:13]} 18. Rab1 {[%emt 0:00:37]} Be8 {[%emt 0:00:11]} 19. Bxf6 {[%emt 0:00:20]} Bxf6 {[%emt 0:00:04]} 20. e5 {[%emt 0:00:01]} Be7 {[%emt 0:00:41]} 21. Qe4 {[%emt 0:00:54]} Nc6 {[%emt 0:00:17]} 22. Bd3 {[%emt 0:00:10]} g6 {[%emt 0:00:09]} 23. Qf4 {[%emt 0:00:41]} Kg7 {[%emt 0:00:26]} 24. h4 {[%emt 0:00:10]} Nb4 {[%emt 0:00:08]} 25. Be4 {[%emt 0:00:18]} Nd5 {[%emt 0:00:30]} 26. Bxd5 {[%emt 0:01:24]} exd5 {[%emt 0:00:02]} 27. d4 {[%emt 0:00:11]} c4 {[%emt 0:00:22]} 28. bxc4 {[%emt 0:00:01]} Rxc4 {[%emt 0:00:03]} 29. Nf1 {[%emt 0:00:09]} Qe6 {[%emt 0:00:25]} 30. Ne3 {[%emt 0:00:02]} h5 {[%emt 0:00:37]} 31. Nxc4 {[%emt 0:00:21]} bxc4 {[%emt 0:00:01]} 32. Ng5 {[%emt 0:00:03]} Qc6 {[%emt 0:00:08]} 33. Ra1 {[%emt 0:00:23]} Rxa1 {[%emt 0:00:14]} 34. Rxa1 {[%emt 0:00:00]} Qb7 {[%emt 0:00:03]} 35. Qc1 {[%emt 0:00:14]} Qb6 {[%emt 0:00:05]} 36. Qf4 {[%emt 0:00:16]} Qb7 {[%emt 0:00:10]} 37. Qf3 {[%emt 0:00:08]} Bf8 {[%emt 0:00:11]} 38. Qf6+ {[%emt 0:00:18]} Kg8 {[%emt 0:00:01]} 39. e6 {[%emt 0:00:00]} Bg7 {[%emt 0:00:01]} 40. exf7+ {[%emt 0:00:16]} Bxf7 {[%emt 0:00:01]} 41. Ra8+ {[%emt 0:00:09]} Qxa8 {[%emt 0:00:04]} 42. Qxf7+ {[%emt 0:00:01]} Kh8 {[%emt 0:00:01]} 43. Qxg6 {[%emt 0:00:01]} Kg8 {[%emt 0:00:14]} 44. Qf7+ {[%emt 0:00:02]} Kh8 {[%emt 0:00:02]} 45. Qxh5+ {[%emt 0:00:01]} Kg8 {[%emt 0:00:01]} 46. Qh7+ {[%emt 0:00:09]} Kf8 {[%emt 0:00:01]} 47. Ne6+ {[%emt 0:00:02]} Kf7 {[%emt 0:00:07]} 48. Nxg7 {[%emt 0:00:01]} Qa1+ {[%emt 0:00:07]} 49. Kh2 {[%emt 0:00:01]} c3 {[%emt 0:00:02]} 50. Nf5+ {[%emt 0:00:05]} Ke6 {[%emt 0:00:06]} 51. Qg6+ {[%emt 0:00:03]} Kd7 {[%emt 0:00:02]} 52. Qd6+ {[%emt 0:00:04]} Kc8 {[%emt 0:00:01]} 53. Qc6+ {[%emt 0:00:10]} Kb8 {[%emt 0:00:05]} 54. Ne3 {[%emt 0:00:06]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "13.7"]
[White "Mendonca, Leon Luke"]
[Black "Badelka, Olga"]
[Result "1-0"]
[ECO "D24"]
[WhiteElo "2549"]
[BlackElo "2433"]
[Annotator "ChessBase"]
[PlyCount "63"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:03]} d5 {[%emt 0:00:00]} 4. Nc3 {[%emt 0:00:03]} dxc4 {[%emt 0:00:02]} 5. e4 {[%emt 0:00:04]} b5 {[%emt 0:00:02]} 6. e5 {[%emt 0:00:04]} Nd5 {[%emt 0:00:01]} 7. Nxb5 {[%emt 0:00:02]} Nb6 {[%emt 0:00:01]} 8. Be2 {[%emt 0:00:14]} Be7 {[%emt 0:00:01]} 9. O-O {[%emt 0:00:04]} Nc6 {[%emt 0:00:03]} 10. Be3 {[%emt 0:00:14]} O-O {[%emt 0:00:18]} 11. b3 {[%emt 0:01:08]} a6 {[%emt 0:01:16]} 12. Nc3 {[%emt 0:00:18]} cxb3 {[%emt 0:00:02]} 13. axb3 {[%emt 0:00:01]} Bb7 {[%emt 0:00:17]} 14. Qb1 {[%emt 0:00:28]} Nb4 {[%emt 0:00:09]} 15. Rc1 {[%emt 0:00:30]} N6d5 {[%emt 0:00:44]} 16. Ne4 {[%emt 0:00:27]} Nxe3 {[%emt 0:01:08]} 17. fxe3 {[%emt 0:00:03]} Nd5 {[%emt 0:00:33]} 18. Kf2 {[%emt 0:01:36]} f5 {[%emt 0:00:19]} 19. exf6 {[%emt 0:00:34]} Nxf6 {[%emt 0:00:17]} 20. Nxf6+ {[%emt 0:01:32]} Bxf6 {[%emt 0:00:02]} 21. Ra5 {[%emt 0:01:06]} Rb8 {[%emt 0:02:13]} 22. Bd3 {[%emt 0:00:34]} g6 {[%emt 0:00:43]} 23. Be4 {[%emt 0:00:18]} Qd6 {[%emt 0:00:46]} 24. Rac5 {[%emt 0:00:48]} Bxd4 {[%emt 0:00:43]} 25. Rc6 {[%emt 0:01:18]} Bxc6 {[%emt 0:00:02]} 26. Rxc6 {[%emt 0:00:01]} Bxe3+ {[%emt 0:01:32]} 27. Kxe3 {[%emt 0:00:00]} Qf4+ {[%emt 0:00:01]} 28. Kf2 {[%emt 0:00:03]} Rbd8 {[%emt 0:00:19]} 29. Kg1 {[%emt 0:00:38]} Qe3+ {[%emt 0:00:06]} 30. Kh1 {[%emt 0:00:01]} Qxe4 {[%emt 0:00:17]} 31. Qxe4 {[%emt 0:00:10]} Rd1+ {[%emt 0:00:10]} 32. Ng1 {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "13.8"]
[White "Abdumalik, Zhansaya"]
[Black "Nihal Sarin"]
[Result "1/2-1/2"]
[ECO "B15"]
[WhiteElo "2472"]
[BlackElo "2620"]
[Annotator "TA"]
[PlyCount "96"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,96,29,0,0,-8,11,-20,-9,-55,-50,-89,-54,-95,-21,-25,-26,-23,-25,-164,-150,-132,12,-83,-41,-51,-39,-49,-25,-36,-35,-32,-2,-7,-3,-5,-3,-11,0,0,0,0,0,0,0,0,0,0,10,0,0,0,0,-2,-6,-10,-10,-12,-13,-25,-8,-131,-209,-191,-8,-8,-8,-8,-8,-8,-3,-3,-2,-3,0,0,0,0,0,0,16,16,16,16,16,0,29]} 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nf6 5. Ng3 h5 6. h4 Bg4 7. Be2 Nbd7 {B15: Caro-Kann: 3 Nc3: 3...g6 and 3...dxe4 4 Nxe4 Nf6 5 Nxf6+ exf6.} 8. Nf3 Qc7 9. Qd3 e6 10. Bd2 Bd6 {[#]} 11. Nf1 $146 ({Predecessor:} 11. Ng5 Bxe2 12. Nxe2 c5 13. g3 c4 14. Qf3 Nb6 15. Bf4 Nbd5 16. Bxd6 Qxd6 17. c3 {1-0 (45) Silva,K (1884)-Teshima,R (1970) Sao Paulo 2018}) 11... e5 12. Nxe5 Bxe5 (12... Nxe5 $17 13. dxe5 Bxe5 14. Bxg4 Nxg4) 13. Bxg4 $1 $11 Nxg4 14. dxe5 O-O-O 15. Qa3 (15. Ne3 $1 $11) 15... Qxe5+ $19 16. Ne3 a6 (16... Nc5 $17 17. Rf1 Nxe3 18. Bxe3 Ne4) 17. Qc3 (17. O-O-O $1 $11 {remains equal.}) 17... Qxc3 18. Bxc3 Nxe3 19. fxe3 Rhe8 20. Bxg7 Rxe3+ 21. Kf2 Re6 (21... Re4 {looks sharper.} 22. g3 Rg8 23. Bh6 Nc5 24. Bf4 Ne6) 22. Rad1 Rg8 23. Bd4 Reg6 24. Rhg1 Rg4 25. g3 f5 26. Be3 Nf6 27. Bf4 Nd5 28. Bg5 Re8 29. Rge1 Rge4 (29... Rf8 {is more complex.} 30. Bh6 Rfg8 31. Bg5 Rb4 32. b3 Nc3) 30. a3 Kd7 31. Rxe4 Rxe4 $11 {[%mdl 4096] Endgame KRB-KRN} 32. Rd3 Ke6 33. b3 b5 34. Rd2 a5 35. Re2 a4 {Black wants to play ...Rxe2+.} 36. Kf3 (36. Rxe4+ $11 {keeps the balance.} fxe4 37. Bc1) 36... b4 (36... Rxe2 $17 37. Kxe2 b4) 37. Bc1 $19 Nc3 {[#]} (37... bxa3 $19 38. Bxa3 Rxe2 39. Kxe2 Nc3+ 40. Kf3 Nb5) 38. Rxe4+ $11 {The position is equal.} fxe4+ {KB-KN} 39. Ke3 bxa3 40. Bxa3 {Black should prevent bxa4.} axb3 (40... Nb5 {keeps more tension.} 41. Bc1 axb3 42. cxb3 Ke5 43. Bb2+ Kf5) 41. cxb3 Kf5 42. Bd6 Nd5+ 43. Kd4 e3 {[#] ...e2 is the strong threat.} 44. Kd3 Kg4 {And now ...Kf3 would win.} 45. Ke2 Kf5 {aiming for ...Ke4.} 46. Kf3 e2 47. Kxe2 Ke4 $1 48. Kd2 Nf6 {Weighted Error Value: White=0.20/Black=0.23} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "13.9"]
[White "Khademalsharieh, Sarasadat"]
[Black "Mammadzada, Gunay"]
[Result "1-0"]
[ECO "D15"]
[WhiteElo "2494"]
[BlackElo "2443"]
[Annotator "ChessBase"]
[PlyCount "115"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. e3 {[%emt 0:00:00]} Nf6 {[%emt 0:00:01]} 3. c4 {[%emt 0:00:01]} c6 {[%emt 0:00:02]} 4. Nc3 {[%emt 0:00:05]} a6 {[%emt 0:00:07]} 5. d4 {[%emt 0:00:32]} Bf5 {[%emt 0:00:02]} 6. Ne5 {[%emt 0:00:01]} Nbd7 {[%emt 0:00:02]} 7. Qb3 {[%emt 0:00:05]} Qc7 {[%emt 0:00:02]} 8. cxd5 {[%emt 0:00:03]} Nxe5 {[%emt 0:00:02]} 9. dxe5 {[%emt 0:00:01]} Nxd5 {[%emt 0:00:01]} 10. Bc4 {[%emt 0:00:02]} e6 {[%emt 0:00:03]} 11. e4 {[%emt 0:00:09]} Nxc3 {[%emt 0:00:02]} 12. exf5 {[%emt 0:00:02]} Nd5 {[%emt 0:00:01]} 13. Bxd5 {[%emt 0:00:00]} cxd5 {[%emt 0:01:33]} 14. O-O {[%emt 0:00:20]} Be7 {[%emt 0:02:20]} 15. Qg3 {[%emt 0:00:22]} g6 {[%emt 0:02:37]} 16. f6 {[%emt 0:00:38]} Bc5 {[%emt 0:00:02]} 17. Be3 {[%emt 0:00:42]} d4 {[%emt 0:01:20]} 18. Bh6 {[%emt 0:00:27]} Qd7 {[%emt 0:00:34]} 19. Rac1 {[%emt 0:00:06]} Qd5 {[%emt 0:00:13]} 20. a3 {[%emt 0:02:45]} Kd7 {[%emt 0:00:13]} 21. b4 {[%emt 0:00:21]} Bb6 {[%emt 0:00:01]} 22. Rcd1 {[%emt 0:00:04]} Rac8 {[%emt 0:00:11]} 23. Rd3 {[%emt 0:00:02]} Rc4 {[%emt 0:00:33]} 24. Rfd1 {[%emt 0:00:04]} Kc8 {[%emt 0:00:06]} 25. h4 {[%emt 0:00:25]} Bc7 {[%emt 0:00:30]} 26. Re1 {[%emt 0:01:01]} Rd8 {[%emt 0:00:11]} 27. h5 {[%emt 0:00:21]} Kb8 {[%emt 0:00:24]} 28. Bf4 {[%emt 0:00:04]} Qc6 {[%emt 0:00:12]} 29. Bd2 {[%emt 0:01:00]} Rd5 {[%emt 0:00:06]} 30. f4 {[%emt 0:00:30]} Rd8 {[%emt 0:00:13]} 31. Rd1 {[%emt 0:00:04]} Bb6 {[%emt 0:00:03]} 32. Be1 {[%emt 0:00:16]} gxh5 {[%emt 0:00:18]} 33. Bf2 {[%emt 0:00:09]} Qe4 {[%emt 0:00:13]} 34. Qh4 {[%emt 0:00:15]} Rg8 {[%emt 0:00:03]} 35. Rg3 {[%emt 0:00:10]} Rxg3 {[%emt 0:00:11]} 36. Qxg3 {[%emt 0:00:02]} Qg6 {[%emt 0:00:01]} 37. Qf3 {[%emt 0:00:07]} Qg4 {[%emt 0:00:04]} 38. Qxg4 {[%emt 0:00:29]} hxg4 {[%emt 0:00:00]} 39. f5 {[%emt 0:00:10]} Rc6 {[%emt 0:00:32]} 40. Bxd4 {[%emt 0:00:19]} Kc7 {[%emt 0:00:01]} 41. Bxb6+ {[%emt 0:00:10]} Rxb6 {[%emt 0:00:00]} 42. fxe6 {[%emt 0:00:19]} Rxe6 {[%emt 0:00:02]} 43. Rd5 {[%emt 0:00:02]} b6 {[%emt 0:00:04]} 44. Kh2 {[%emt 0:00:11]} h5 {[%emt 0:00:15]} 45. Kg3 {[%emt 0:00:05]} Kc6 {[%emt 0:00:00]} 46. Rd8 {[%emt 0:00:14]} Rxe5 {[%emt 0:00:02]} 47. Rf8 {[%emt 0:00:01]} Kd6 {[%emt 0:00:02]} 48. Rxf7 {[%emt 0:00:03]} Ke6 {[%emt 0:00:01]} 49. Rb7 {[%emt 0:00:26]} Kxf6 {[%emt 0:00:04]} 50. Rxb6+ {[%emt 0:00:01]} Kg5 {[%emt 0:00:07]} 51. Rxa6 {[%emt 0:00:02]} Re3+ {[%emt 0:00:01]} 52. Kh2 {[%emt 0:00:02]} Kh4 {[%emt 0:00:10]} 53. Rf6 {[%emt 0:00:11]} Rxa3 {[%emt 0:00:05]} 54. Rf5 {[%emt 0:00:12]} Rb3 {[%emt 0:00:07]} 55. g3+ {[%emt 0:00:04]} Rxg3 {[%emt 0:00:06]} 56. Rxh5+ {[%emt 0:00:00]} Kxh5 {[%emt 0:00:00]} 57. Kxg3 {[%emt 0:00:01]} Kg5 {[%emt 0:00:09]} 58. b5 {[%emt 0:00:03]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "13.10"]
[White "Abdusattorov, Nodirbek"]
[Black "Murzin, Volodar"]
[Result "1-0"]
[ECO "B14"]
[WhiteElo "2627"]
[BlackElo "2478"]
[Annotator "TA"]
[PlyCount "93"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 14,93,18,0,7,8,12,0,0,0,23,19,21,14,68,6,21,22,25,25,22,18,25,22,26,0,56,66,70,51,58,43,76,52,62,55,47,55,66,61,48,20,61,54,54,54,56,54,87,86,81,50,164,158,165,113,144,95,96,88,93,74,97,95,100,89,83,53,157,161,172,76,775,777,774,759,1706,1089,1092,1072,29989,522]} 1. e4 c6 2. d4 d5 3. exd5 cxd5 4. c4 Nf6 5. Nc3 g6 6. Qb3 Bg7 7. cxd5 O-O 8. g3 a5 {B14: Caro-Kann: Panov-Botvinnik Attack with 5...e6 and 5...g6.} 9. Bg2 {[#]} a4 $146 ({Predecessor:} 9... Na6 10. Nge2 Nb4 11. O-O Bf5 12. Bf4 Bc2 13. Qa3 Nfxd5 14. Be5 Bf5 15. Bxg7 Kxg7 16. Rad1 {½-½ (57) Erdogdu,M (2396)-Purtseladze,M (2274) Chess.com INT 2021}) 10. Nxa4 Nxd5 {The position is equal.} 11. Ne2 e6 12. O-O Nc6 13. Nac3 Re8 (13... Nxc3 $11 14. bxc3 Na5) 14. Rd1 (14. Nxd5 $14 exd5 15. Be3) 14... Bd7 15. Nxd5 (15. Qxb7 $2 Na5 $19) 15... exd5 16. Be3 Bg4 17. Nc3 Bxd1 18. Rxd1 Ne7 19. Nxd5 {And now Bg5 would win.} ({Don't play} 19. Qxb7 Rb8 $15) 19... Nxd5 (19... Nf5 $11) 20. Bxd5 $14 Qd7 21. Kg2 ({But not} 21. Bxb7 $2 Rab8 $19) 21... Red8 22. Bf3 ({Wrong is} 22. Bxb7 $2 Rab8 $19) 22... Ra5 23. a3 Rb5 24. Qc2 Rc8 25. Qa4 Rd5 26. Qxd7 Rxd7 27. Rd2 Bf8 28. Bg4 f5 29. Bd1 $36 {[%mdl 2048] Threatens to win with Bb3+. White is pushing.} Kg7 30. Bb3 {Be6 is the strong threat.} Rdd8 31. Be6 Rc7 32. d5 {aiming for Bd4+.} Rc4 (32... Bc5 $14) 33. Bd4+ $18 Kh6 {[#]} 34. Bf6 ({White should try} 34. Bb6 $1 $18 {[%cal Rb6d8]} Ra8 35. d6) 34... Rd6 35. Be5 Rd8 36. h4 Bd6 37. Bc3 Re8 38. Rd3 Ra8 39. Kh3 Re8 40. f3 f4 ({Black should play} 40... b5 $14) 41. g4 $16 {Intending g5+ and mate.} g5 42. Bf6 (42. Rd1 $18 {has better winning chances.}) 42... gxh4 $2 {[%mdl 8192] [#] Black cannot hold the game after this.} (42... Kg6 $16 43. hxg5 h6) 43. Bf7 $1 $18 {[%csl Gf6][%cal Rg4g5]} Re5 44. Kxh4 Be7 45. g5+ {[%mdl 64] Overworked Piece} Rxg5 46. Bxe7 {White threatens Bf8+ and mate.} Rg1 47. Bf8+ {Weighted Error Value: White=0.14/Black=0.37} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "14.1"]
[White "Zhu, Jiner"]
[Black "Murzin, Volodar"]
[Result "0-1"]
[ECO "B12"]
[WhiteElo "2459"]
[BlackElo "2478"]
[Annotator "TA"]
[PlyCount "150"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,150,17,20,56,37,37,38,39,29,33,29,38,5,138,130,133,133,126,127,150,122,134,129,114,93,83,83,82,31,33,33,36,20,49,41,66,66,79,72,79,79,76,75,80,79,80,34,47,29,46,55,77,72,144,138,139,0,107,108,102,66,105,106,104,74,125,85,83,79,85,79,87,81,80,60,66,63,85,8,8,0,0,0,0,0,0,0,0,0,0,0,8,0,0,-32,-20,-33,-41,-48,-29,-39,-29,-22,-43,-127,-143,-239,-239,-387,-255,-255,-255,-368,-360,-384,-360,-351,-303,-346,-291,-274,-246,-666,-666,-535,-526,-506,-305,-865,-792,-1033,-787,-1538,-1450,-29979,-29980,-29981,-29982,-29983,-29983]} 1. e4 c6 2. d4 d5 3. e5 Bf5 4. Nf3 e6 5. Be2 Ne7 6. O-O c5 {6...h6 is setting a new trend.} 7. dxc5 Nbc6 {B12: Caro-Kann: Advance Variation.} 8. c4 dxc4 9. Bxc4 Ng6 {White is slightly better.} 10. Be3 Be7 11. Nc3 O-O 12. Be2 {[#]} Ngxe5 $146 (12... Qb8 $11) ({Predecessor:} 12... Qb8 13. Nd2 Rd8 14. f4 Nb4 15. Rc1 b6 16. c6 Nxc6 17. Bf3 Qb7 18. Nb5 Rac8 {1-0 (42) Harikrishna,P (2729)-Mamedyarov,S (2817) Kolkata 2018}) 13. Nxe5 $16 Nxe5 14. f4 $1 {Black must now prevent Qxd8.} Qxd1 15. Raxd1 Ng4 16. Bxg4 Bxg4 17. Rd7 {[%csl LRb7,LRe7][%mdl 64] Double Attack} Bf6 18. Rxb7 Bxc3 19. bxc3 {Strongly threatening c6.} Bf5 20. c6 (20. Rd1 $16) 20... Be4 $14 21. Rxa7 Bxc6 22. Rd1 Bd5 23. a3 Rab8 24. Bc5 Rfc8 25. Bb4 h6 26. Rd4 Rc4 27. Rxc4 Bxc4 $16 {[%mdl 4096] Endgame KRB-KRB} 28. Rc7 Bb3 29. Rd7 Rc8 30. Kf2 Rc4 31. Ke3 Rc6 32. g3 f6 (32... g5 $142) 33. Ra7 Rc8 34. Rd7 ({White should play} 34. a4 $16) 34... Ba4 (34... Rc6 $1 $11) 35. Rd6 (35. Re7 {feels hotter.} Bb3 36. Ra7 Re8 37. a4 e5 38. a5) 35... Bb3 36. Kd4 Rc4+ {[#]} 37. Kd3 $1 Rc8 38. Rd7 Ba4 (38... Kh7 $142) 39. Rd4 Kf7 40. Bd6 Bc6 41. c4 g5 42. Kc3 Kg6 43. c5 Ra8 44. Kb3 Kf5 45. a4 (45. Rb4 $16) 45... e5 $11 46. fxe5 fxe5 47. g4+ Ke6 48. Rb4 (48. Rd3 {is interesting.} Bxa4+ 49. Kb4 Be8 50. Re3 Ra4+ 51. Kc3) 48... Kd5 49. Kc3 Bxa4 50. Rb2 Bc6 51. Rd2+ Ke6 52. Re2 e4 53. Kd4 Ra4+ 54. Ke3 Ra3+ 55. Kd4 Rd3+ 56. Kc4 Bd5+ 57. Kb4 Rb3+ 58. Ka5 {[#] White is on the road to losing.} ({Better is} 58. Ka4 $1 $15) 58... e3 $1 $17 59. Bg3 (59. Bf8 $17) 59... Bc4 $19 60. Rc2 (60. Ka4 {was the only defense.} Kd5 61. Bd6) 60... Rb5+ 61. Ka4 Rxc5 {aiming for ...Bb5+.} 62. Kb4 (62. Rc3 {is the only way for White.} e2 63. Re3+ Kd5 64. Re5+ Kd4 65. Rxc5 Kxc5 66. Bf2+ Kd5 67. Kb4) 62... Kd5 63. Rc1 {Hoping for Rd1+.} Rb5+ 64. Kc3 {With the idea Rd1+.} Rb3+ 65. Kc2 Ke4 66. Ra1 Rb6 67. Ra7 $2 (67. Ra4 Kd4 68. Be1) 67... Bd3+ 68. Kc3 Rc6+ 69. Kb4 Kf3 70. Re7 $2 (70. Rc7 Rb6+ 71. Kc3) 70... e2 71. Rd7 Be4 72. Re7 Rc1 73. Re6 Rg1 {Black mates.} 74. Rf6+ Kxg4 75. Re6 Rxg3 {Weighted Error Value: White=0.19/Black=0.18} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "14.2"]
[White "Mammadzada, Gunay"]
[Black "Abdusattorov, Nodirbek"]
[Result "0-1"]
[ECO "C72"]
[WhiteElo "2443"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "68"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,68,35,34,41,57,46,35,116,0,0,-33,-39,-43,-20,-20,-20,-20,-22,-35,-31,-41,-38,-36,0,-9,0,-31,-31,-31,-35,-37,-37,-33,-33,-113,-101,-158,-116,-245,-231,-254,-241,-240,-250,-331,-302,-476,-516,-556,-547,-529,-529,-475,-341,-797,-789,-756,-739,-1420,-1364]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. O-O Bd7 6. c3 g5 {C72: Ruy Lopez: Deferred Steinitz: 5 0-0.} 7. d4 g4 8. Ne1 Bg7 $5 {[%mdl 4] [#] A promising side line.} ({Better is} 8... h5 $14) 9. dxe5 $146 ({White should play} 9. d5 $16 Nce7 10. Qxg4) ({Predecessor:} 9. d5 Nce7 10. Qxg4 Bxa4 11. Qxg7 Ng6 12. f4 Qf6 13. Qxf6 Nxf6 14. fxe5 Nxe4 15. exd6 cxd6 16. Nd2 Nc5 17. Nc4 {1-0 (17) Boguslavsky,O (2316)-Dushatskiy,F (2225) Eppingen 2004}) 9... Nxe5 $11 10. Bxd7+ Qxd7 11. Nd3 h5 12. Nxe5 Bxe5 13. Nd2 O-O-O 14. Nc4 $1 Bg7 15. Bg5 Re8 16. f3 h4 {White must now prevent ...Qb5.} (16... Qb5 $5 17. Qd5 $8 Qxd5 18. exd5 b5 $11) 17. fxg4 h3 18. g3 Rxe4 19. Qd5 Qe6 20. Qxe6+ fxe6 21. Rf4 Re2 {Strongly threatening ...Nh6.} 22. Raf1 (22. Rf2 $15 Rxf2 23. Kxf2) 22... b5 23. Na5 (23. Ne3 $142) 23... Nh6 ({And not} 23... Rxb2 24. Rf8+ $1 {[%mdl 512]} Bxf8 25. Rxf8+ Kd7 26. Rd8#) 24. R1f2 {[#] White does not recover from this.} (24. R4f2 $17 Rxf2 25. Rxf2) 24... Re5 $1 $19 {[%cal Re5g5]} 25. Bh4 Re1+ 26. Rf1 Rxf1+ 27. Kxf1 e5 28. Rf3 (28. Re4 $142 d5 29. Re2) 28... Nxg4 29. Kg1 Bh6 30. Nc6 e4 31. Rf7 e3 {( -> ...e2)} 32. Kf1 (32. Nd4) 32... Nxh2+ {Black is clearly winning.} 33. Ke2 Ng4 34. Ne7+ Kb7 {Weighted Error Value: White=0.55/Black=0.13} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "14.3"]
[White "Nihal Sarin"]
[Black "Khademalsharieh, Sarasadat"]
[Result "1-0"]
[ECO "A05"]
[WhiteElo "2620"]
[BlackElo "2494"]
[Annotator "TA"]
[PlyCount "131"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 16,131,6,11,49,13,56,3,93,77,92,105,121,118,110,113,144,129,171,164,158,132,137,135,138,134,129,129,125,123,138,126,154,150,154,154,154,0,123,133,136,136,153,135,156,156,185,182,179,143,196,189,189,202,200,166,251,184,277,184,266,259,284,268,372,365,517,322,301,0,366,359,466,344,443,443,444,443,449,449,449,0,448,448,443,420,521,436,519,446,531,487,538,458,591,587,539,523,491,509,604,594,710,725,855,850,801,789,683,671,1096,1018,2312,1840,2154,1878,29983,29984]} 1. Nf3 d5 2. b3 Nf6 3. Bb2 g6 4. c4 dxc4 5. bxc4 Bg7 6. g3 O-O 7. Bg2 c5 8. O-O Nc6 9. d3 e6 {[#] A05: Réti Opening: 1 Nf3 Nf6.} 10. Nbd2 $146 ({Predecessor:} 10. Nc3 Qc7 11. Qd2 Qd8 12. Rfd1 Bd7 13. Rac1 Qe7 14. e3 Rac8 15. Ba3 b6 16. d4 {0-1 (42) Zarubitski,V (2442)-Lu,S (2615) Tornelo INT 2020}) 10... Qe7 11. Rb1 (11. Ne5 $14) 11... Rd8 (11... Qc7 $11) 12. Ne5 $16 Nxe5 13. Bxe5 Ne8 {[#]} 14. Bxg7 Kxg7 15. Qa4 Nd6 16. Qa5 Nf5 17. Nb3 Nd4 18. Rfe1 ({Resist} 18. Qxc5 $6 Nxe2+ 19. Kh1 Qf6 $16) 18... Nxb3 19. Rxb3 Rd7 20. Reb1 Rc7 21. h4 h5 22. Bf3 e5 23. Bd5 Qd7 24. Rb5 Qe7 25. Qa3 Kh7 26. Qa5 Kg7 $1 27. Kg2 Kh7 28. Qa3 Kg7 29. Ra5 a6 30. Rb6 Ra7 31. Qb2 Kh7 32. Ra3 {[%cal Ba5a3,Ba3b3,Bb3b1][%mdl 32]} Ra8 (32... a5 $16 {was necessary.} 33. Kh1 a4) 33. Rab3 $18 Ra7 34. Qc1 Kg7 35. Qe3 Ra8 (35... a5 $142 36. Rb2 a4) 36. Rb1 Ra7 (36... a5 $142 37. Kg1 a4) 37. Qd2 Ra8 (37... Bd7 $142 38. Qe3 (38. Bxb7 $2 Rcxb7 39. f3 Bc8 $19) 38... Bc8) 38. a4 {[%cal Ba2a4,Ba4a5][%mdl 32]} Ra7 39. a5 Kh7 40. Qe3 Rd7 (40... f6 $142 41. Kg1 Kg7) 41. Qf3 Kg7 42. Qe3 $2 {[#]} ({White should play} 42. Qe4 $18) 42... Rc7 $2 {[%mdl 8192]} (42... Kh7 $1 $11 {and Black has nothing to worry.} 43. Kg1 Rc7) 43. f3 Rd7 44. Qg5 Qxg5 45. hxg5 Rc7 46. Kf2 Kf8 47. Ke3 Re7 48. Kf2 Rc7 $1 49. e4 Re7 50. Ke3 Ke8 51. Rd6 Be6 52. Rbb6 Bxd5 53. Rxd5 {[%mdl 4096] Endgame KRR-KRR} Ra8 54. Rxc5 Rd8 55. Rd5 Rc8 56. f4 exf4+ 57. Kxf4 Rcc7 58. c5 Re6 59. d4 Ree7 60. Rdd6 Kf8 61. e5 Ke8 62. Ke4 Kf8 63. Rd8+ Kg7 64. Rbd6 Kh7 65. Rb8 Red7 66. d5 {Weighted Error Value: White=0.32/Black=0.52} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "14.4"]
[White "Badelka, Olga"]
[Black "Abdumalik, Zhansaya"]
[Result "1-0"]
[ECO "E60"]
[WhiteElo "2433"]
[BlackElo "2472"]
[Annotator "ChessBase"]
[PlyCount "133"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. g3 {[%emt 0:00:04]} Bg7 {[%emt 0:00:14]} 4. c4 {[%emt 0:00:04]} c5 {[%emt 0:00:07]} 5. Nc3 {[%emt 0:00:04]} cxd4 {[%emt 0:00:18]} 6. Nxd4 {[%emt 0:00:02]} O-O {[%emt 0:00:03]} 7. Bg2 {[%emt 0:00:03]} Qc7 {[%emt 0:00:00]} 8. Qd3 {[%emt 0:00:03]} Nc6 {[%emt 0:00:34]} 9. O-O {[%emt 0:00:05]} Ne5 {[%emt 0:00:36]} 10. Qe3 {[%emt 0:00:02]} d6 {[%emt 0:00:43]} 11. b3 {[%emt 0:00:16]} Qb6 {[%emt 0:00:48]} 12. Na4 {[%emt 0:01:17]} Qc7 {[%emt 0:00:51]} 13. Bb2 {[%emt 0:00:15]} Bd7 {[%emt 0:00:08]} 14. Nc3 {[%emt 0:00:08]} a6 {[%emt 0:00:08]} 15. h3 {[%emt 0:00:30]} Rfe8 {[%emt 0:00:12]} 16. Rac1 {[%emt 0:00:22]} Qb6 {[%emt 0:00:24]} 17. Nd5 {[%emt 0:01:27]} Qd8 {[%emt 0:00:24]} 18. Nxf6+ {[%emt 0:02:09]} Bxf6 {[%emt 0:00:45]} 19. f4 {[%emt 0:00:03]} Nc6 {[%emt 0:00:01]} 20. Nxc6 {[%emt 0:00:01]} Bxc6 {[%emt 0:00:19]} 21. Bxf6 {[%emt 0:00:12]} exf6 {[%emt 0:00:03]} 22. Qf2 {[%emt 0:00:37]} Qa5 {[%emt 0:00:13]} 23. Rc2 {[%emt 0:00:23]} Rac8 {[%emt 0:00:40]} 24. Rd1 {[%emt 0:00:29]} Re6 {[%emt 0:00:33]} 25. Rcd2 {[%emt 0:00:31]} Rce8 {[%emt 0:00:19]} 26. Bf1 {[%emt 0:00:32]} Qb4 {[%emt 0:00:26]} 27. f5 {[%emt 0:00:49]} Re5 {[%emt 0:01:28]} 28. fxg6 {[%emt 0:00:02]} hxg6 {[%emt 0:00:01]} 29. Rxd6 {[%emt 0:00:17]} Rf5 {[%emt 0:00:15]} 30. Qd4 {[%emt 0:00:10]} Re4 {[%emt 0:00:09]} 31. Rd8+ {[%emt 0:00:24]} Kg7 {[%emt 0:00:01]} 32. Qd6 {[%emt 0:00:09]} Qb6+ {[%emt 0:00:28]} 33. Rd4 {[%emt 0:00:06]} Kh7 {[%emt 0:00:48]} 34. Qf8 {[%emt 0:00:31]} Qxd4+ {[%emt 0:00:01]} 35. Rxd4 {[%emt 0:00:02]} Rxd4 {[%emt 0:00:01]} 36. Qxf7+ {[%emt 0:00:01]} Kh6 {[%emt 0:00:04]} 37. Qf8+ {[%emt 0:00:05]} Kg5 {[%emt 0:00:16]} 38. Qh8 {[%emt 0:00:34]} Re5 {[%emt 0:00:37]} 39. Kf2 {[%emt 0:00:02]} Kf5 {[%emt 0:00:06]} 40. g4+ {[%emt 0:00:15]} Ke6 {[%emt 0:00:05]} 41. Qg8+ {[%emt 0:00:07]} Ke7 {[%emt 0:00:05]} 42. Qg7+ {[%emt 0:00:02]} Ke6 {[%emt 0:00:02]} 43. Qg8+ {[%emt 0:00:02]} Ke7 {[%emt 0:00:03]} 44. Qxg6 {[%emt 0:00:04]} Rf4+ {[%emt 0:00:03]} 45. Ke1 {[%emt 0:00:01]} Rd4 {[%emt 0:00:12]} 46. h4 {[%emt 0:00:06]} Be8 {[%emt 0:00:02]} 47. Qg7+ {[%emt 0:00:03]} Bf7 {[%emt 0:00:01]} 48. g5 {[%emt 0:00:05]} Ke8 {[%emt 0:00:11]} 49. Qxf6 {[%emt 0:00:05]} Rde4 {[%emt 0:00:05]} 50. g6 {[%emt 0:00:01]} Bg8 {[%emt 0:00:01]} 51. Qh8 {[%emt 0:00:16]} Kf8 {[%emt 0:00:03]} 52. Qf6+ {[%emt 0:00:08]} Ke8 {[%emt 0:00:01]} 53. g7 {[%emt 0:00:00]} Kd7 {[%emt 0:00:02]} 54. Qf8 {[%emt 0:00:03]} Re8 {[%emt 0:00:01]} 55. Qf5+ {[%emt 0:00:14]} Kc7 {[%emt 0:00:01]} 56. h5 {[%emt 0:00:06]} R4e6 {[%emt 0:00:01]} 57. Qf4+ {[%emt 0:00:04]} Kb6 {[%emt 0:00:06]} 58. h6 {[%emt 0:00:02]} Bh7 {[%emt 0:00:00]} 59. Qd4+ {[%emt 0:00:05]} Kc7 {[%emt 0:00:04]} 60. Qf4+ {[%emt 0:00:05]} Kb6 {[%emt 0:00:01]} 61. Qd4+ {[%emt 0:00:01]} Kc7 {[%emt 0:00:00]} 62. a4 {[%emt 0:00:02]} Rd6 {[%emt 0:00:06]} 63. Qf4 {[%emt 0:00:02]} Kc6 {[%emt 0:00:06]} 64. Bg2+ {[%emt 0:00:06]} Kd7 {[%emt 0:00:01]} 65. Bd5 {[%emt 0:00:06]} Rg6 {[%emt 0:00:06]} 66. Qf7+ {[%emt 0:00:06]} Re7 {[%emt 0:00:04]} 67. Qxg6 {[%emt 0:00:02]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "14.5"]
[White "Lei, Tingjie"]
[Black "Mendonca, Leon Luke"]
[Result "0-1"]
[ECO "B90"]
[WhiteElo "2505"]
[BlackElo "2549"]
[Annotator "ChessBase"]
[PlyCount "124"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:09]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:01]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:00]} a6 {[%emt 0:00:02]} 6. a4 {[%emt 0:00:01]} g6 {[%emt 0:00:45]} 7. Be2 {[%emt 0:00:02]} Bg7 {[%emt 0:00:03]} 8. O-O {[%emt 0:00:01]} O-O {[%emt 0:00:03]} 9. Be3 {[%emt 0:00:01]} Nc6 {[%emt 0:00:08]} 10. Qd2 {[%emt 0:00:01]} Bd7 {[%emt 0:00:49]} 11. Rfd1 {[%emt 0:00:03]} Rc8 {[%emt 0:00:50]} 12. f3 {[%emt 0:00:02]} Nxd4 {[%emt 0:02:40]} 13. Bxd4 {[%emt 0:00:03]} Be6 {[%emt 0:00:03]} 14. a5 {[%emt 0:01:53]} Bc4 {[%emt 0:00:51]} 15. Ra4 {[%emt 0:00:35]} Bxe2 {[%emt 0:00:24]} 16. Qxe2 {[%emt 0:00:07]} Qd7 {[%emt 0:00:51]} 17. Rb4 {[%emt 0:00:29]} Qc7 {[%emt 0:00:15]} 18. Bb6 {[%emt 0:01:03]} Qc6 {[%emt 0:00:16]} 19. Rd2 {[%emt 0:01:21]} Rfe8 {[%emt 0:00:18]} 20. Nd5 {[%emt 0:00:59]} Nd7 {[%emt 0:00:48]} 21. Be3 {[%emt 0:00:14]} e6 {[%emt 0:00:16]} 22. Nb6 {[%emt 0:00:12]} Nxb6 {[%emt 0:00:01]} 23. Rxb6 {[%emt 0:00:01]} Qa4 {[%emt 0:00:18]} 24. c3 {[%emt 0:00:57]} d5 {[%emt 0:00:24]} 25. Rxb7 {[%emt 0:00:09]} Qxa5 {[%emt 0:00:10]} 26. Bd4 {[%emt 0:00:56]} Bxd4+ {[%emt 0:00:46]} 27. Rxd4 {[%emt 0:00:03]} Qc5 {[%emt 0:00:24]} 28. Qf2 {[%emt 0:00:26]} dxe4 {[%emt 0:00:22]} 29. fxe4 {[%emt 0:00:48]} Rc7 {[%emt 0:00:16]} 30. Rxc7 {[%emt 0:01:02]} Qxc7 {[%emt 0:00:00]} 31. Qf6 {[%emt 0:00:02]} Rb8 {[%emt 0:00:08]} 32. Rd2 {[%emt 0:00:35]} Qb6+ {[%emt 0:00:04]} 33. Qf2 {[%emt 0:00:17]} Qc6 {[%emt 0:00:07]} 34. Qf4 {[%emt 0:00:04]} Qb6+ {[%emt 0:00:05]} 35. Qf2 {[%emt 0:00:13]} Qc6 {[%emt 0:00:03]} 36. Qf4 {[%emt 0:00:07]} Qc5+ {[%emt 0:00:06]} 37. Qf2 {[%emt 0:00:03]} Qe5 {[%emt 0:00:06]} 38. Qd4 {[%emt 0:00:11]} Qxd4+ {[%emt 0:00:03]} 39. cxd4 {[%emt 0:00:01]} Kf8 {[%emt 0:00:01]} 40. Kf2 {[%emt 0:00:02]} Ke7 {[%emt 0:00:01]} 41. Rc2 {[%emt 0:00:04]} Kd6 {[%emt 0:00:07]} 42. Ke3 {[%emt 0:00:07]} Rb3+ {[%emt 0:00:03]} 43. Kf4 {[%emt 0:00:10]} f5 {[%emt 0:00:05]} 44. exf5 {[%emt 0:00:04]} gxf5 {[%emt 0:00:04]} 45. Rc8 {[%emt 0:00:10]} Rxb2 {[%emt 0:00:06]} 46. Rd8+ {[%emt 0:00:02]} Ke7 {[%emt 0:00:03]} 47. Rh8 {[%emt 0:00:02]} Rxg2 {[%emt 0:00:03]} 48. Rxh7+ {[%emt 0:00:01]} Kd6 {[%emt 0:00:02]} 49. h4 {[%emt 0:00:10]} Rg4+ {[%emt 0:00:08]} 50. Ke3 {[%emt 0:00:01]} Rg3+ {[%emt 0:00:07]} 51. Ke2 {[%emt 0:00:12]} Kd5 {[%emt 0:00:06]} 52. Rd7+ {[%emt 0:00:01]} Kc6 {[%emt 0:00:12]} 53. Ra7 {[%emt 0:00:03]} Rh3 {[%emt 0:00:03]} 54. Re7 {[%emt 0:00:09]} Kd5 {[%emt 0:00:04]} 55. Rd7+ {[%emt 0:00:01]} Kc6 {[%emt 0:00:10]} 56. Ra7 {[%emt 0:00:08]} Rxh4 {[%emt 0:00:04]} 57. Rxa6+ {[%emt 0:00:01]} Kd5 {[%emt 0:00:01]} 58. Ra5+ {[%emt 0:00:07]} Kc4 {[%emt 0:00:09]} 59. Ra6 {[%emt 0:00:12]} Re4+ {[%emt 0:00:08]} 60. Kf3 {[%emt 0:00:01]} Kxd4 {[%emt 0:00:04]} 61. Ra4+ {[%emt 0:00:03]} Ke5 {[%emt 0:00:01]} 62. Ra5+ {[%emt 0:00:04]} Kf6 {[%emt 0:00:01]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "14.6"]
[White "Yip, Carissa"]
[Black "Keymer, Vincent"]
[Result "0-1"]
[ECO "B97"]
[WhiteElo "2430"]
[BlackElo "2591"]
[Annotator "ChessBase"]
[PlyCount "86"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:00]} 4. Nxd4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Nc3 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 6. Bg5 {[%emt 0:00:05]} e6 {[%emt 0:00:00]} 7. f4 {[%emt 0:00:03]} Qb6 {[%emt 0:00:01]} 8. Qd2 {[%emt 0:00:15]} Qxb2 {[%emt 0:00:02]} 9. Rb1 {[%emt 0:00:01]} Qa3 {[%emt 0:00:02]} 10. f5 {[%emt 0:00:03]} Be7 {[%emt 0:00:15]} 11. Be2 {[%emt 0:00:15]} O-O {[%emt 0:02:42]} 12. Be3 {[%emt 0:00:18]} Qa5 {[%emt 0:01:09]} 13. g4 {[%emt 0:00:33]} Qd8 {[%emt 0:01:01]} 14. g5 {[%emt 0:00:06]} Nfd7 {[%emt 0:00:11]} 15. Rg1 {[%emt 0:01:05]} Nc6 {[%emt 0:00:39]} 16. f6 {[%emt 0:02:05]} Nxf6 {[%emt 0:00:01]} 17. gxf6 {[%emt 0:00:01]} Bxf6 {[%emt 0:00:01]} 18. Nf3 {[%emt 0:00:56]} b5 {[%emt 0:00:32]} 19. Bg5 {[%emt 0:00:28]} Bb7 {[%emt 0:00:15]} 20. Nd1 {[%emt 0:00:18]} Rc8 {[%emt 0:00:48]} 21. Nf2 {[%emt 0:00:58]} Bxg5 {[%emt 0:00:41]} 22. Qxg5 {[%emt 0:00:32]} Qxg5 {[%emt 0:00:05]} 23. Rxg5 {[%emt 0:00:01]} Ba8 {[%emt 0:00:21]} 24. Kd2 {[%emt 0:00:12]} f6 {[%emt 0:00:31]} 25. Rgg1 {[%emt 0:00:26]} Rfd8 {[%emt 0:00:05]} 26. Rgd1 {[%emt 0:00:25]} Rc7 {[%emt 0:00:17]} 27. Ke1 {[%emt 0:00:13]} Kf7 {[%emt 0:00:08]} 28. c4 {[%emt 0:00:29]} b4 {[%emt 0:00:04]} 29. Nd3 {[%emt 0:00:23]} a5 {[%emt 0:00:02]} 30. c5 {[%emt 0:00:08]} d5 {[%emt 0:00:24]} 31. exd5 {[%emt 0:00:10]} Rxd5 {[%emt 0:00:00]} 32. Rbc1 {[%emt 0:00:12]} Ne7 {[%emt 0:00:10]} 33. Rc4 {[%emt 0:00:36]} Bb7 {[%emt 0:00:19]} 34. Rd4 {[%emt 0:00:08]} e5 {[%emt 0:00:02]} 35. Rxd5 {[%emt 0:00:36]} Nxd5 {[%emt 0:00:00]} 36. c6 {[%emt 0:00:28]} Bxc6 {[%emt 0:00:15]} 37. Ndxe5+ {[%emt 0:00:20]} fxe5 {[%emt 0:00:03]} 38. Bc4 {[%emt 0:00:01]} Ke6 {[%emt 0:00:11]} 39. Kf2 {[%emt 0:00:05]} Bb7 {[%emt 0:00:41]} 40. Bb3 {[%emt 0:00:06]} a4 {[%emt 0:00:08]} 41. Bxa4 {[%emt 0:00:01]} Rf7 {[%emt 0:00:09]} 42. Bb3 {[%emt 0:00:04]} e4 {[%emt 0:00:03]} 43. Re1 {[%emt 0:00:12]} Rxf3+ {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "14.7"]
[White "Praggnanandhaa R"]
[Black "Gukesh D"]
[Result "1/2-1/2"]
[ECO "D32"]
[WhiteElo "2608"]
[BlackElo "2578"]
[Annotator "TA"]
[PlyCount "92"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,92,22,31,29,24,24,25,32,38,28,74,68,73,54,60,66,80,13,22,14,31,27,23,40,96,93,160,160,164,146,144,155,136,141,145,146,137,134,129,135,142,142,237,239,320,328,302,283,527,511,507,489,516,431,380,55,58,63,67,81,79,0,0,0,8,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 c5 5. cxd5 exd5 6. Bg5 Be6 7. Bxf6 Qxf6 8. e4 {D32: Tarrasch Defence: Sidelines and lines without g3.} dxe4 9. Nxe4 Qf4 10. Bb5+ {White has an edge.} Nc6 11. Qe2 {Strongly threatening d5!} O-O-O 12. Bxc6 (12. dxc5 Bd5 $15) 12... bxc6 13. O-O $1 ({Weaker is} 13. dxc5 Bd5 $15) 13... Bd5 14. Rfe1 ({But not} 14. Nxc5 Bxc5 15. Qa6+ (15. dxc5 Bc4 $17) 15... Kb8 $15) 14... cxd4 {White should prevent ...Bb4.} 15. Qa6+ (15. g3 $16 Qc7 16. Nxd4) 15... Kb8 $11 16. Nxd4 Bb4 $1 {[%cal Rb4e1] [#]} 17. g3 $1 Qc7 18. Nc3 {[#]} Bxc3 $146 (18... Qb7 $14 19. Qa4 Bh1 20. Kxh1 Rxd4) ({Predecessor:} 18... Qb7 19. Qa4 Bh1 20. Kxh1 Rxd4 21. Qc2 h5 22. Qf5 Ka8 23. a3 Bxc3 24. bxc3 Rd5 {½-½ (36) Nozicka,V (2018)-Green,M (2047) ICCF email 2017}) 19. bxc3 $16 {[%cal Bb2c3,Bc3c4][%mdl 32] Threatens to win with c4.} Rhe8 {[#]} ({Black should play} 19... Ka8) 20. c4 $1 $36 {[%cal Rc4d5][%mdl 2048] White has strong initiative.} Rxe1+ 21. Rxe1 Bh1 22. Kxh1 Rxd4 {[%mdl 4096] Endgame KQR-KQR} 23. Re8+ Rd8 24. Rxd8+ {[%mdl 64] Overworked Piece} Qxd8 25. Qxc6 {KQ-KQ} Qc7 26. Qd5 Qb7 {[#]} 27. Kg2 $1 Qc7 (27... Qe7 $16 {was worth a try.} 28. Qd4 g6) 28. Kf3 $18 g6 29. c5 Kc8 30. h4 h5 (30... a5 31. Kg4 f6) 31. Ke4 Qe7+ 32. Kd3 {aiming for Qa8+.} Kc7 33. f4 f6 34. f5 $2 (34. Kd4 $18 Qf8 35. f5 gxf5 36. Qxf5) 34... gxf5 $14 35. Qxf5 Qe1 {And now ...Qb1+ would win.} 36. Qf4+ Kc8 37. Kc4 (37. Qf3 $16) 37... Qe2+ $11 {The position is equal.} 38. Kb3 (38. Kd5 {seems wilder.} Qxa2+ 39. Kd6 Qf7 40. Qf5+ Kd8 41. g4) 38... Qb5+ (38... Qd3+ {is more complex.} 39. Kb2 f5 40. c6 Qb5+ 41. Ka1 Qc5) 39. Qb4 Qd3+ 40. Qc3 Qb5+ 41. Ka3 Qa6+ 42. Kb2 Qe2+ 43. Qc2 Qe5+ 44. Qc3 {Black must now prevent Qxe5.} Qe2+ 45. Ka3 Qa6+ 46. Kb2 Qe2+ {White really could win this.  Weighted Error Value: White=0.23/Black=0.16} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "14.8"]
[White "Salimova, Nurgyul"]
[Black "Bjerre, Jonas Buhl"]
[Result "1/2-1/2"]
[ECO "E11"]
[WhiteElo "2397"]
[BlackElo "2550"]
[Annotator "ChessBase"]
[PlyCount "148"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:01]} d5 {[%emt 0:00:00]} 3. c4 {[%emt 0:00:04]} e6 {[%emt 0:00:00]} 4. g3 {[%emt 0:00:01]} Bb4+ {[%emt 0:00:01]} 5. Bd2 {[%emt 0:00:03]} Be7 {[%emt 0:00:01]} 6. Bg2 {[%emt 0:00:07]} O-O {[%emt 0:00:01]} 7. O-O {[%emt 0:00:23]} c6 {[%emt 0:00:02]} 8. Bf4 {[%emt 0:00:10]} dxc4 {[%emt 0:00:03]} 9. Ne5 {[%emt 0:00:24]} Nd5 {[%emt 0:00:01]} 10. Nxc4 {[%emt 0:00:03]} Nxf4 {[%emt 0:00:01]} 11. gxf4 {[%emt 0:00:01]} Qc7 {[%emt 0:00:01]} 12. e3 {[%emt 0:00:15]} Nd7 {[%emt 0:00:11]} 13. Nc3 {[%emt 0:00:16]} b6 {[%emt 0:00:24]} 14. Rc1 {[%emt 0:00:40]} Bb7 {[%emt 0:00:06]} 15. Qf3 {[%emt 0:00:17]} Rab8 {[%emt 0:01:24]} 16. Qg3 {[%emt 0:00:27]} f5 {[%emt 0:01:22]} 17. Ne5 {[%emt 0:00:31]} Nxe5 {[%emt 0:00:35]} 18. dxe5 {[%emt 0:00:07]} Rbd8 {[%emt 0:01:09]} 19. Nb5 {[%emt 0:00:30]} Qd7 {[%emt 0:00:10]} 20. Nd4 {[%emt 0:00:24]} c5 {[%emt 0:00:53]} 21. Nxe6 {[%emt 0:03:02]} Qxe6 {[%emt 0:00:43]} 22. Bxb7 {[%emt 0:00:01]} Rd2 {[%emt 0:00:15]} 23. Ba6 {[%emt 0:00:29]} Kh8 {[%emt 0:00:40]} 24. Bc4 {[%emt 0:00:06]} Qc6 {[%emt 0:00:14]} 25. Rfd1 {[%emt 0:01:17]} Rxb2 {[%emt 0:00:35]} 26. Bd5 {[%emt 0:00:02]} Qh6 {[%emt 0:00:04]} 27. Rb1 {[%emt 0:00:57]} Rxb1 {[%emt 0:01:27]} 28. Rxb1 {[%emt 0:00:02]} Rd8 {[%emt 0:00:01]} 29. Qg2 {[%emt 0:00:12]} Qg6 {[%emt 0:00:37]} 30. Qxg6 {[%emt 0:00:44]} hxg6 {[%emt 0:00:03]} 31. Bf7 {[%emt 0:00:09]} Kh7 {[%emt 0:00:31]} 32. Kg2 {[%emt 0:00:08]} Rd2 {[%emt 0:00:06]} 33. h4 {[%emt 0:00:06]} Kh6 {[%emt 0:00:12]} 34. Rh1 {[%emt 0:00:35]} b5 {[%emt 0:00:22]} 35. Rh3 {[%emt 0:00:08]} c4 {[%emt 0:00:14]} 36. Rg3 {[%emt 0:00:03]} c3 {[%emt 0:00:14]} 37. Rxg6+ {[%emt 0:00:03]} Kh7 {[%emt 0:00:01]} 38. Rc6 {[%emt 0:00:06]} c2 {[%emt 0:00:08]} 39. Bg6+ {[%emt 0:00:04]} Kg8 {[%emt 0:00:02]} 40. Rc8+ {[%emt 0:00:07]} Rd8 {[%emt 0:00:15]} 41. Rxc2 {[%emt 0:00:03]} Bxh4 {[%emt 0:00:02]} 42. Bxf5 {[%emt 0:00:04]} b4 {[%emt 0:00:06]} 43. Be6+ {[%emt 0:00:05]} Kh8 {[%emt 0:00:04]} 44. Kf3 {[%emt 0:00:06]} g6 {[%emt 0:00:05]} 45. Rc1 {[%emt 0:00:08]} Kg7 {[%emt 0:00:08]} 46. Rc7+ {[%emt 0:00:02]} Kh6 {[%emt 0:00:01]} 47. Rxa7 {[%emt 0:00:04]} Rd2 {[%emt 0:00:01]} 48. Ra8 {[%emt 0:00:10]} Rxf2+ {[%emt 0:00:05]} 49. Kg4 {[%emt 0:00:06]} Be7 {[%emt 0:00:04]} 50. Rh8+ {[%emt 0:00:03]} Kg7 {[%emt 0:00:03]} 51. Rg8+ {[%emt 0:00:01]} Kh6 {[%emt 0:00:02]} 52. Re8 {[%emt 0:00:08]} Bc5 {[%emt 0:00:01]} 53. f5 {[%emt 0:00:10]} gxf5+ {[%emt 0:00:03]} 54. Bxf5 {[%emt 0:00:01]} Bxe3 {[%emt 0:00:02]} 55. Be6 {[%emt 0:00:08]} Bd4 {[%emt 0:00:05]} 56. Bb3 {[%emt 0:00:05]} Re2 {[%emt 0:00:06]} 57. Kf5 {[%emt 0:00:03]} Kg7 {[%emt 0:00:04]} 58. Rg8+ {[%emt 0:00:03]} Kh7 {[%emt 0:00:01]} 59. Re8 {[%emt 0:00:06]} Kg7 {[%emt 0:00:04]} 60. e6 {[%emt 0:00:08]} Bc5 {[%emt 0:00:03]} 61. Rc8 {[%emt 0:00:04]} Be7 {[%emt 0:00:04]} 62. Rc7 {[%emt 0:00:03]} Kf8 {[%emt 0:00:01]} 63. Rb7 {[%emt 0:00:04]} Re1 {[%emt 0:00:03]} 64. Kg6 {[%emt 0:00:06]} Rg1+ {[%emt 0:00:03]} 65. Kf5 {[%emt 0:00:01]} Re1 {[%emt 0:00:01]} 66. Rb8+ {[%emt 0:00:04]} Kg7 {[%emt 0:00:01]} 67. Re8 {[%emt 0:00:02]} Bc5 {[%emt 0:00:03]} 68. Rc8 {[%emt 0:00:09]} Be7 {[%emt 0:00:01]} 69. Rc2 {[%emt 0:00:04]} Kf8 {[%emt 0:00:13]} 70. Rg2 {[%emt 0:00:04]} Re3 {[%emt 0:00:11]} 71. Rh2 {[%emt 0:00:09]} Kg7 {[%emt 0:00:07]} 72. Rg2+ {[%emt 0:00:01]} Kf8 {[%emt 0:00:02]} 73. Kf4 {[%emt 0:00:04]} Re1 {[%emt 0:00:03]} 74. Kf5 {[%emt 0:00:06]} Re3 {[%emt 0:00:04]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "14.10"]
[White "Liang, Awonder"]
[Black "Yoo, Christopher Woojin"]
[Result "1-0"]
[ECO "B40"]
[WhiteElo "2592"]
[BlackElo "2455"]
[Annotator "ChessBase"]
[PlyCount "69"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:01]} 4. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:07]} 5. Nxd4 {[%emt 0:00:01]} Nf6 {[%emt 0:00:18]} 6. Nxc6 {[%emt 0:00:07]} bxc6 {[%emt 0:00:00]} 7. Bd3 {[%emt 0:00:01]} d5 {[%emt 0:00:04]} 8. O-O {[%emt 0:00:01]} Be7 {[%emt 0:00:01]} 9. e5 {[%emt 0:00:16]} Nd7 {[%emt 0:00:03]} 10. Re1 {[%emt 0:00:02]} c5 {[%emt 0:01:21]} 11. Qg4 {[%emt 0:00:10]} g6 {[%emt 0:00:11]} 12. Bh6 {[%emt 0:00:10]} c4 {[%emt 0:00:46]} 13. Bf1 {[%emt 0:00:02]} Bf8 {[%emt 0:01:08]} 14. Bxf8 {[%emt 0:00:36]} Kxf8 {[%emt 0:00:03]} 15. b3 {[%emt 0:00:01]} cxb3 {[%emt 0:02:11]} 16. axb3 {[%emt 0:00:00]} Kg7 {[%emt 0:00:16]} 17. Nb5 {[%emt 0:00:14]} a6 {[%emt 0:00:38]} 18. Qf4 {[%emt 0:00:10]} Qe7 {[%emt 0:00:55]} 19. Nd6 {[%emt 0:00:19]} a5 {[%emt 0:00:51]} 20. c4 {[%emt 0:01:41]} dxc4 {[%emt 0:00:13]} 21. bxc4 {[%emt 0:00:59]} a4 {[%emt 0:00:07]} 22. Ra3 {[%emt 0:00:15]} Ra5 {[%emt 0:00:46]} 23. Qd4 {[%emt 0:00:06]} Rd8 {[%emt 0:00:39]} 24. Qc3 {[%emt 0:00:29]} Ra6 {[%emt 0:00:23]} 25. Qb4 {[%emt 0:01:19]} Kg8 {[%emt 0:00:43]} 26. Rxa4 {[%emt 0:00:06]} Rxa4 {[%emt 0:00:04]} 27. Qxa4 {[%emt 0:00:01]} Nxe5 {[%emt 0:00:07]} 28. Nxc8 {[%emt 0:00:03]} Qg5 {[%emt 0:00:03]} 29. Rxe5 {[%emt 0:00:05]} Qc1 {[%emt 0:00:17]} 30. Ne7+ {[%emt 0:00:12]} Kg7 {[%emt 0:00:05]} 31. c5 {[%emt 0:00:06]} Rd1 {[%emt 0:00:03]} 32. Qb5 {[%emt 0:00:01]} Qf4 {[%emt 0:00:08]} 33. Re3 {[%emt 0:00:08]} Rd2 {[%emt 0:00:07]} 34. Rf3 {[%emt 0:00:01]} Qg5 {[%emt 0:00:09]} 35. Qe8 {[%emt 0:00:03]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "15.1"]
[White "Yoo, Christopher Woojin"]
[Black "Zhu, Jiner"]
[Result "1/2-1/2"]
[ECO "C84"]
[WhiteElo "2455"]
[BlackElo "2459"]
[Annotator "TA"]
[PlyCount "148"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,148,17,14,13,20,16,16,12,12,14,12,60,0,10,0,0,0,0,0,8,2,4,8,27,0,6,10,14,0,0,-5,-1,-15,-3,-3,0,0,-2,-38,-30,-28,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,22,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d4 exd4 6. O-O Be7 7. e5 Ne4 8. Nxd4 Nxd4 9. Qxd4 Nc5 10. Nc3 O-O 11. Bb3 d6 {C84: Closed Ruy Lopez: Unusual White 6th moves.} 12. Bf4 dxe5 13. Qxe5 Bd6 14. Qd4 Bxf4 15. Qxf4 Nxb3 16. axb3 (16. Rad1 $5 {[%cal Rd1d8]} Qf6 17. Qxf6 gxf6 18. cxb3 $14) 16... Be6 17. Rfe1 {[#]} Qd7 $146 ({Predecessor:} 17... Qd6 18. Qxd6 cxd6 19. Rad1 Rfd8 20. Re2 Rac8 21. Red2 Rc6 22. f3 Kf8 23. g4 Ke7 {0-1 (49) Izbinsky,S-Romanovsky,A St Petersburg 1906}) 18. Rad1 {[%cal Ba1d1,Bd1d3,Bd3g3][%mdl 32]} Qc6 19. Rd3 Rad8 20. Rg3 f6 21. h4 Kh8 22. Rge3 Rfe8 23. Qa4 Bd7 24. Rxe8+ Rxe8 25. Rxe8+ Bxe8 26. Qb4 {[%cal Rb4f8] [#]} (26. Qc4 {is interesting.} Bg6 27. Nd5 Bxc2 28. Nxc7 Bxb3 29. Qxc6 bxc6 30. Nxa6 g5 31. hxg5 fxg5 32. f3) 26... Kg8 27. Qe7 Qd7 28. Qe4 c6 29. Qf4 (29. Na4 {feels hotter.} Bf7 30. Nb6 Qd1+ 31. Kh2 h6 32. Nc4) 29... Bg6 30. Ne4 Bxe4 (30... Qd1+ {seems wilder.} 31. Kh2 h5 32. Nc5 Bxc2 33. b4 b6) 31. Qxe4 $11 {[%mdl 4096] Endgame KQ-KQ. The position is equal.} h6 (31... a5 {is interesting.} 32. Qc4+ Kh8 33. Qc5 h6 34. g3 Kh7) 32. g3 Kf7 33. Kg2 Qd6 34. b4 Qd7 35. h5 Qd6 36. c3 Qd7 37. g4 Qd6 38. Qg6+ Kf8 39. Qf5 Kf7 40. Qe4 Qd7 41. Qf4 Qd5+ 42. Kg3 Qd3+ 43. f3 Qd7 44. Qc4+ Kf8 45. Qf4 Kf7 46. Kf2 Kf8 47. Ke3 Qe6+ 48. Qe4 Qd6 49. Qf5 {Threatens to win with Qc8+.} Qe7+ 50. Kf2 Kf7 51. Qg6+ Kf8 52. Qd3 Qc7 53. Ke3 Qe5+ 54. Qe4 {[#] Hoping for Qxe5.} Qd6 55. Qd4 Qe6+ 56. Kf2 Qb3 57. Qd8+ Kf7 58. Qd7+ Kg8 59. Qe8+ Kh7 60. Qg6+ Kh8 61. Qe8+ Kh7 62. Qe2 Kh8 63. Kg3 Qf7 64. Qe4 Qb3 65. Qe2 Kh7 66. f4 Qd5 67. Qf3 Qd2 68. Qf2 Qd3+ 69. Kg2 Qe4+ 70. Kg3 Qd3+ 71. Qf3 Qc2 72. Qg2 Qd3+ 73. Qf3 Qc2 74. Qf2 Qd3+ {Weighted Error Value: White=0.04/Black=0.03} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "15.2"]
[White "Shuvalova, Polina"]
[Black "Liang, Awonder"]
[Result "0-1"]
[ECO "E97"]
[WhiteElo "2476"]
[BlackElo "2592"]
[Annotator "ChessBase"]
[PlyCount "70"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:00]} Bg7 {[%emt 0:00:00]} 4. e4 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 5. Nf3 {[%emt 0:00:00]} O-O {[%emt 0:00:00]} 6. Be2 {[%emt 0:00:01]} e5 {[%emt 0:00:01]} 7. O-O {[%emt 0:00:01]} Nc6 {[%emt 0:00:01]} 8. d5 {[%emt 0:00:01]} Ne7 {[%emt 0:00:01]} 9. Bg5 {[%emt 0:00:01]} h6 {[%emt 0:00:11]} 10. Bd2 {[%emt 0:00:03]} a5 {[%emt 0:00:59]} 11. Rc1 {[%emt 0:00:13]} c5 {[%emt 0:00:46]} 12. dxc6 {[%emt 0:00:46]} bxc6 {[%emt 0:00:02]} 13. c5 {[%emt 0:00:21]} d5 {[%emt 0:00:06]} 14. exd5 {[%emt 0:00:43]} Nfxd5 {[%emt 0:00:02]} 15. Bc4 {[%emt 0:02:42]} f5 {[%emt 0:00:46]} 16. Qe2 {[%emt 0:00:24]} e4 {[%emt 0:00:15]} 17. Ne1 {[%emt 0:00:02]} Kh7 {[%emt 0:00:09]} 18. Nc2 {[%emt 0:00:06]} Be6 {[%emt 0:00:48]} 19. f3 {[%emt 0:01:16]} Nxc3 {[%emt 0:02:00]} 20. Bxc3 {[%emt 0:00:05]} Bxc3 {[%emt 0:00:03]} 21. Bxe6 {[%emt 0:00:49]} Qd2 {[%emt 0:00:50]} 22. Rce1 {[%emt 0:01:34]} Qxe2 {[%emt 0:01:18]} 23. Rxe2 {[%emt 0:00:01]} Bxb2 {[%emt 0:00:01]} 24. fxe4 {[%emt 0:00:09]} f4 {[%emt 0:00:00]} 25. e5 {[%emt 0:00:07]} g5 {[%emt 0:00:15]} 26. a4 {[%emt 0:00:33]} Ng6 {[%emt 0:00:15]} 27. Rfe1 {[%emt 0:00:34]} Rae8 {[%emt 0:00:51]} 28. Bd7 {[%emt 0:00:18]} Rxe5 {[%emt 0:00:01]} 29. Bxc6 {[%emt 0:00:02]} Rxc5 {[%emt 0:00:08]} 30. Be4 {[%emt 0:00:56]} Kg7 {[%emt 0:00:02]} 31. Rd1 {[%emt 0:00:04]} Ne5 {[%emt 0:00:25]} 32. h3 {[%emt 0:00:23]} Rc4 {[%emt 0:00:31]} 33. Ne1 {[%emt 0:00:14]} Bd4+ {[%emt 0:00:11]} 34. Kh2 {[%emt 0:00:01]} Be3 {[%emt 0:00:02]} 35. Rd5 {[%emt 0:00:17]} Rxe4 {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "15.4"]
[White "Gukesh D"]
[Black "Salimova, Nurgyul"]
[Result "1-0"]
[ECO "B12"]
[WhiteElo "2578"]
[BlackElo "2397"]
[Annotator "ChessBase"]
[PlyCount "133"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 2. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 3. e5 {[%emt 0:00:00]} Bf5 {[%emt 0:00:02]} 4. Nf3 {[%emt 0:00:00]} e6 {[%emt 0:00:01]} 5. Be2 {[%emt 0:00:01]} Ne7 {[%emt 0:00:02]} 6. c3 {[%emt 0:00:04]} Nd7 {[%emt 0:00:31]} 7. O-O {[%emt 0:00:09]} Ng6 {[%emt 0:00:15]} 8. Ne1 {[%emt 0:00:02]} h5 {[%emt 0:00:41]} 9. Nc2 {[%emt 0:00:03]} c5 {[%emt 0:02:07]} 10. Ne3 {[%emt 0:00:17]} Bxb1 {[%emt 0:00:07]} 11. Rxb1 {[%emt 0:00:02]} Qb6 {[%emt 0:00:20]} 12. Bxh5 {[%emt 0:00:41]} O-O-O {[%emt 0:00:41]} 13. Re1 {[%emt 0:02:50]} cxd4 {[%emt 0:00:27]} 14. cxd4 {[%emt 0:00:04]} Bb4 {[%emt 0:00:02]} 15. Rf1 {[%emt 0:00:09]} Nf4 {[%emt 0:01:07]} 16. Bf3 {[%emt 0:01:05]} Kb8 {[%emt 0:00:15]} 17. Nc2 {[%emt 0:00:27]} Ng6 {[%emt 0:00:18]} 18. Nxb4 {[%emt 0:00:40]} Qxb4 {[%emt 0:00:00]} 19. g3 {[%emt 0:00:03]} Ne7 {[%emt 0:00:52]} 20. Qd3 {[%emt 0:00:13]} Nf5 {[%emt 0:01:03]} 21. Rd1 {[%emt 0:00:03]} f6 {[%emt 0:00:13]} 22. exf6 {[%emt 0:00:23]} gxf6 {[%emt 0:00:09]} 23. Bf4+ {[%emt 0:00:13]} Ka8 {[%emt 0:00:01]} 24. Bg4 {[%emt 0:00:07]} Ng7 {[%emt 0:00:24]} 25. Rbc1 {[%emt 0:00:55]} e5 {[%emt 0:00:54]} 26. Bd2 {[%emt 0:00:12]} Qd6 {[%emt 0:00:20]} 27. Qb3 {[%emt 0:01:17]} f5 {[%emt 0:00:28]} 28. dxe5 {[%emt 0:00:17]} Nxe5 {[%emt 0:00:04]} 29. Be2 {[%emt 0:00:02]} Ne6 {[%emt 0:00:08]} 30. Ba5 {[%emt 0:00:16]} Nf4 {[%emt 0:00:33]} 31. Qe3 {[%emt 0:01:35]} Nh3+ {[%emt 0:00:17]} 32. Kf1 {[%emt 0:00:07]} Rde8 {[%emt 0:00:07]} 33. Bc7 {[%emt 0:00:04]} Qf6 {[%emt 0:00:06]} 34. Qd4 {[%emt 0:00:09]} f4 {[%emt 0:00:07]} 35. Bxe5 {[%emt 0:00:04]} Rxe5 {[%emt 0:00:02]} 36. Rc5 {[%emt 0:00:14]} fxg3 {[%emt 0:00:07]} 37. hxg3 {[%emt 0:00:03]} Ng5 {[%emt 0:00:05]} 38. Qh4 {[%emt 0:00:07]} Rf8 {[%emt 0:00:03]} 39. Qf4 {[%emt 0:00:03]} Qe7 {[%emt 0:00:04]} 40. Rdc1 {[%emt 0:00:02]} b6 {[%emt 0:00:09]} 41. Qxf8+ {[%emt 0:00:04]} Qxf8 {[%emt 0:00:02]} 42. Rc8+ {[%emt 0:00:01]} Qxc8 {[%emt 0:00:01]} 43. Rxc8+ {[%emt 0:00:00]} Kb7 {[%emt 0:00:00]} 44. Rc2 {[%emt 0:00:02]} Ne6 {[%emt 0:00:08]} 45. Rd2 {[%emt 0:00:02]} Kc6 {[%emt 0:00:09]} 46. f4 {[%emt 0:00:04]} Re3 {[%emt 0:00:02]} 47. Kf2 {[%emt 0:00:01]} d4 {[%emt 0:00:02]} 48. Bf3+ {[%emt 0:00:02]} Kc5 {[%emt 0:00:05]} 49. a3 {[%emt 0:00:18]} Rb3 {[%emt 0:00:15]} 50. Bd1 {[%emt 0:00:08]} Re3 {[%emt 0:00:02]} 51. Bg4 {[%emt 0:00:08]} Nc7 {[%emt 0:00:06]} 52. Be2 {[%emt 0:00:06]} Ne6 {[%emt 0:00:04]} 53. b4+ {[%emt 0:00:04]} Kd5 {[%emt 0:00:07]} 54. Rc2 {[%emt 0:00:17]} Rxa3 {[%emt 0:00:02]} 55. Bc4+ {[%emt 0:00:04]} Kd6 {[%emt 0:00:02]} 56. Rd2 {[%emt 0:00:01]} Rc3 {[%emt 0:00:14]} 57. Bxe6 {[%emt 0:00:04]} Kxe6 {[%emt 0:00:00]} 58. Rxd4 {[%emt 0:00:00]} Kf5 {[%emt 0:00:05]} 59. Rd5+ {[%emt 0:00:02]} Kg4 {[%emt 0:00:08]} 60. Rg5+ {[%emt 0:00:04]} Kh3 {[%emt 0:00:01]} 61. b5 {[%emt 0:00:01]} Rb3 {[%emt 0:00:06]} 62. Rg7 {[%emt 0:00:15]} Rxb5 {[%emt 0:00:05]} 63. Rh7+ {[%emt 0:00:02]} Kg4 {[%emt 0:00:02]} 64. Rh4+ {[%emt 0:00:00]} Kf5 {[%emt 0:00:03]} 65. Rh5+ {[%emt 0:00:01]} Kg4 {[%emt 0:00:01]} 66. Rxb5 {[%emt 0:00:01]} a6 {[%emt 0:00:07]} 67. Rxb6 {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "15.5"]
[White "Keymer, Vincent"]
[Black "Praggnanandhaa R"]
[Result "1-0"]
[ECO "E62"]
[WhiteElo "2591"]
[BlackElo "2608"]
[Annotator "TA"]
[PlyCount "93"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 19,93,51,58,43,60,60,54,49,56,25,10,15,12,15,15,11,10,10,10,10,10,10,7,10,10,6,8,9,10,7,7,6,16,10,10,5,8,5,9,0,11,0,5,0,0,0,10,2,5,6,8,9,10,0,0,0,0,0,7,0,43,43,39,60,77,75,500,499,463,444,518,508,29987,29988,29991,29992]} 1. Nf3 Nf6 2. c4 g6 3. Nc3 Bg7 4. g3 O-O 5. Bg2 d6 6. d4 Nc6 7. O-O e5 8. dxe5 dxe5 9. Bg5 h6 10. Qxd8 Rxd8 11. Bxf6 {E62: King's Indian: Fianchetto: 6...c6 and Panno Variation (6...Nc6) without ...a6.} Bxf6 12. Nd5 Kg7 {outshines the older 12...Bg7.} 13. Nxc7 {White is slightly better.} Rb8 14. Nd5 e4 15. Nd2 e3 16. Nxf6 {[#] Nde4 is the strong threat.} exd2 17. Nd5 Bg4 18. f3 Be6 {[#] And now ...b5 would win.} 19. e4 $146 ({Predecessor:} 19. f4 Na5 20. Rfd1 Nxc4 21. e4 Bg4 22. b3 Bxd1 23. Rxd1 Nd6 24. Rxd2 Rbc8 25. Kf2 {0-1 (43) Oparin,G (2652)-Shevchenko,K (2599) Tornelo INT 2021}) 19... Na5 20. Rfd1 Nxc4 21. b3 Bxd5 22. exd5 Ne3 23. Rxd2 Rxd5 24. Rxd5 Nxd5 $11 {[%mdl 4096] Endgame KRB-KRN} 25. Rc1 Nf6 26. f4 Ne8 27. Kf2 b6 28. Bf3 Rd8 29. Ke3 Kf8 30. Rc4 Nd6 31. Rc7 Nf5+ 32. Ke4 a5 (32... Re8+ {with more complications.} 33. Kd5 Rd8+ 34. Ke5 Re8+ 35. Kd5) 33. Bg4 Re8+ 34. Kd3 Rd8+ 35. Kc3 Ne3 {[#] White must now prevent ...Nd5+.} 36. Bf3 Rd6 37. a4 h5 38. b4 axb4+ 39. Kxb4 Rd2 40. Kb5 Rb2+ 41. Ka6 Rxh2 42. Kxb6 Rh3 $2 {[%mdl 8192] Black cannot hold the game after this.} (42... Rb2+ $16 {is a better chance.} 43. Ka6 Nf5) 43. Rc3 $18 Nf5 44. a5 Rxg3 {If only Black now had time for ...Rg1....} 45. a6 {Threatens to win with a7.} Ne7 (45... Rg1 $18 46. a7 Ra1 47. a8=Q+ Rxa8) 46. a7 Rxf3 47. a8=Q+ {[%mdl 64] Double Attack.  Weighted Error Value: White=0.02/Black=0.41} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "15.6"]
[White "Mendonca, Leon Luke"]
[Black "Yip, Carissa"]
[Result "1-0"]
[ECO "E61"]
[WhiteElo "2549"]
[BlackElo "2430"]
[Annotator "ChessBase"]
[PlyCount "95"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:04]} g6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:03]} Bg7 {[%emt 0:00:00]} 4. Nf3 {[%emt 0:00:09]} O-O {[%emt 0:00:01]} 5. e3 {[%emt 0:00:02]} d6 {[%emt 0:00:05]} 6. Be2 {[%emt 0:00:02]} b6 {[%emt 0:00:10]} 7. O-O {[%emt 0:00:10]} Bb7 {[%emt 0:00:01]} 8. Qc2 {[%emt 0:00:52]} Nbd7 {[%emt 0:00:10]} 9. b3 {[%emt 0:00:26]} e5 {[%emt 0:00:07]} 10. Bb2 {[%emt 0:00:07]} Qe7 {[%emt 0:00:01]} 11. Rfd1 {[%emt 0:00:24]} Rad8 {[%emt 0:00:04]} 12. Rac1 {[%emt 0:01:25]} h6 {[%emt 0:00:25]} 13. dxe5 {[%emt 0:00:51]} Nxe5 {[%emt 0:00:21]} 14. Nd5 {[%emt 0:00:34]} Bxd5 {[%emt 0:01:19]} 15. cxd5 {[%emt 0:00:06]} Nxf3+ {[%emt 0:00:02]} 16. Bxf3 {[%emt 0:00:02]} Ne8 {[%emt 0:00:01]} 17. Bxg7 {[%emt 0:00:10]} Kxg7 {[%emt 0:00:01]} 18. Rd4 {[%emt 0:00:34]} f5 {[%emt 0:00:05]} 19. g3 {[%emt 0:00:15]} Rc8 {[%emt 0:00:13]} 20. Be2 {[%emt 0:00:17]} a5 {[%emt 0:00:11]} 21. Ba6 {[%emt 0:00:11]} Ra8 {[%emt 0:00:03]} 22. Bb5 {[%emt 0:00:06]} Rf7 {[%emt 0:00:05]} 23. Rc4 {[%emt 0:00:08]} Ra7 {[%emt 0:00:08]} 24. Bxe8 {[%emt 0:00:58]} Qxe8 {[%emt 0:00:00]} 25. Qc3+ {[%emt 0:00:20]} Kg8 {[%emt 0:00:03]} 26. Kg2 {[%emt 0:00:05]} Kh7 {[%emt 0:00:48]} 27. h4 {[%emt 0:00:11]} Qe7 {[%emt 0:00:07]} 28. Qd4 {[%emt 0:00:07]} Qe8 {[%emt 0:00:14]} 29. Qf4 {[%emt 0:00:21]} Qe7 {[%emt 0:00:35]} 30. Qd4 {[%emt 0:00:15]} Qe8 {[%emt 0:00:04]} 31. Kf1 {[%emt 0:00:52]} Qe7 {[%emt 0:00:13]} 32. Qc3 {[%emt 0:00:10]} Qe8 {[%emt 0:00:05]} 33. Ke2 {[%emt 0:00:04]} Qb5 {[%emt 0:00:25]} 34. Qd3 {[%emt 0:00:06]} Qe8 {[%emt 0:00:28]} 35. Kd2 {[%emt 0:00:22]} Kg8 {[%emt 0:00:25]} 36. Qc3 {[%emt 0:00:09]} Qb5 {[%emt 0:00:07]} 37. Qd3 {[%emt 0:00:06]} a4 {[%emt 0:00:43]} 38. Rxa4 {[%emt 0:00:26]} Ra5 {[%emt 0:00:08]} 39. Qxb5 {[%emt 0:00:06]} Rxb5 {[%emt 0:00:01]} 40. Rd4 {[%emt 0:00:01]} Re7 {[%emt 0:00:05]} 41. Rcc4 {[%emt 0:00:10]} Kf7 {[%emt 0:00:15]} 42. b4 {[%emt 0:00:15]} Re5 {[%emt 0:00:10]} 43. Rxc7+ {[%emt 0:00:09]} Kf6 {[%emt 0:00:02]} 44. Rc6 {[%emt 0:00:30]} Rexd5 {[%emt 0:00:05]} 45. Kc3 {[%emt 0:00:04]} Rxd4 {[%emt 0:00:08]} 46. exd4 {[%emt 0:00:00]} Ke6 {[%emt 0:00:10]} 47. a4 {[%emt 0:00:03]} Rd5 {[%emt 0:00:03]} 48. Rxb6 {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "15.7"]
[White "Abdumalik, Zhansaya"]
[Black "Lei, Tingjie"]
[Result "1/2-1/2"]
[ECO "C65"]
[WhiteElo "2472"]
[BlackElo "2505"]
[Annotator "ChessBase"]
[PlyCount "141"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 4. d3 {[%emt 0:00:08]} Bc5 {[%emt 0:00:00]} 5. Nbd2 {[%emt 0:00:02]} O-O {[%emt 0:00:04]} 6. Nb3 {[%emt 0:00:05]} Bd6 {[%emt 0:00:02]} 7. O-O {[%emt 0:00:10]} a6 {[%emt 0:00:01]} 8. Bxc6 {[%emt 0:00:04]} dxc6 {[%emt 0:00:01]} 9. Na5 {[%emt 0:00:03]} Re8 {[%emt 0:00:33]} 10. b3 {[%emt 0:00:12]} c5 {[%emt 0:00:21]} 11. Bb2 {[%emt 0:00:17]} Nd7 {[%emt 0:01:35]} 12. Nc4 {[%emt 0:00:34]} Qe7 {[%emt 0:01:00]} 13. a4 {[%emt 0:00:26]} f6 {[%emt 0:00:11]} 14. Nh4 {[%emt 0:00:15]} Nf8 {[%emt 0:00:03]} 15. Nf5 {[%emt 0:00:29]} Bxf5 {[%emt 0:00:31]} 16. exf5 {[%emt 0:00:01]} b5 {[%emt 0:01:07]} 17. Nd2 {[%emt 0:00:35]} Nd7 {[%emt 0:00:03]} 18. Qf3 {[%emt 0:00:05]} Rab8 {[%emt 0:00:14]} 19. Rfe1 {[%emt 0:00:09]} Qf7 {[%emt 0:00:41]} 20. h3 {[%emt 0:00:30]} Nb6 {[%emt 0:00:11]} 21. axb5 {[%emt 0:00:21]} axb5 {[%emt 0:00:01]} 22. Ra5 {[%emt 0:00:43]} Nd5 {[%emt 0:01:02]} 23. Rea1 {[%emt 0:00:13]} Red8 {[%emt 0:00:39]} 24. Qe4 {[%emt 0:00:47]} Bf8 {[%emt 0:00:31]} 25. Qg4 {[%emt 0:01:41]} Nb4 {[%emt 0:00:13]} 26. Rc1 {[%emt 0:00:01]} Ra8 {[%emt 0:00:17]} 27. Rxa8 {[%emt 0:01:06]} Rxa8 {[%emt 0:00:03]} 28. Bc3 {[%emt 0:00:27]} Nd5 {[%emt 0:00:48]} 29. Ra1 {[%emt 0:00:07]} Rxa1+ {[%emt 0:00:13]} 30. Bxa1 {[%emt 0:00:02]} Nb4 {[%emt 0:00:13]} 31. c4 {[%emt 0:00:32]} c6 {[%emt 0:00:26]} 32. f4 {[%emt 0:01:07]} exf4 {[%emt 0:00:56]} 33. Ne4 {[%emt 0:00:07]} Kh8 {[%emt 0:00:03]} 34. Qxf4 {[%emt 0:00:30]} Nxd3 {[%emt 0:00:17]} 35. Qb8 {[%emt 0:00:04]} h6 {[%emt 0:00:01]} 36. cxb5 {[%emt 0:00:10]} cxb5 {[%emt 0:00:01]} 37. Qxb5 {[%emt 0:00:01]} Nf4 {[%emt 0:00:19]} 38. Qf1 {[%emt 0:00:21]} Qc7 {[%emt 0:00:11]} 39. Qc4 {[%emt 0:00:12]} Qa7 {[%emt 0:00:06]} 40. Bc3 {[%emt 0:00:07]} Qa2 {[%emt 0:00:07]} 41. Bd2 {[%emt 0:00:05]} Qa1+ {[%emt 0:00:09]} 42. Kh2 {[%emt 0:00:20]} Qe5 {[%emt 0:00:01]} 43. g3 {[%emt 0:00:11]} Nd5 {[%emt 0:00:04]} 44. Kg2 {[%emt 0:00:07]} Kh7 {[%emt 0:00:03]} 45. Qd3 {[%emt 0:00:01]} Nb4 {[%emt 0:00:06]} 46. Qb1 {[%emt 0:00:03]} Kh8 {[%emt 0:00:07]} 47. Nf2 {[%emt 0:00:03]} Qd5+ {[%emt 0:00:04]} 48. Ne4 {[%emt 0:00:02]} Nd3 {[%emt 0:00:04]} 49. Kf3 {[%emt 0:00:02]} Qxf5+ {[%emt 0:00:02]} 50. Ke3 {[%emt 0:00:01]} Nb4 {[%emt 0:00:15]} 51. g4 {[%emt 0:00:04]} Nd5+ {[%emt 0:00:02]} 52. Ke2 {[%emt 0:00:01]} Qe5 {[%emt 0:00:02]} 53. Kf3 {[%emt 0:00:03]} f5 {[%emt 0:00:02]} 54. Nf2 {[%emt 0:00:03]} fxg4+ {[%emt 0:00:07]} 55. Nxg4 {[%emt 0:00:08]} Qh5 {[%emt 0:00:05]} 56. Kg2 {[%emt 0:00:04]} Qe8 {[%emt 0:00:02]} 57. Qd3 {[%emt 0:00:03]} Nc7 {[%emt 0:00:14]} 58. Qf3 {[%emt 0:00:03]} Bd6 {[%emt 0:00:05]} 59. Bc3 {[%emt 0:00:01]} Ne6 {[%emt 0:00:06]} 60. Nxh6 {[%emt 0:00:26]} Qg6+ {[%emt 0:00:02]} 61. Ng4 {[%emt 0:00:01]} Nf4+ {[%emt 0:00:02]} 62. Kf1 {[%emt 0:00:09]} Qb1+ {[%emt 0:00:02]} 63. Be1 {[%emt 0:00:01]} Qf5 {[%emt 0:00:16]} 64. Nf2 {[%emt 0:00:02]} Qe6 {[%emt 0:00:04]} 65. Qa8+ {[%emt 0:00:03]} Kh7 {[%emt 0:00:01]} 66. Qe4+ {[%emt 0:00:01]} Qxe4 {[%emt 0:00:01]} 67. Nxe4 {[%emt 0:00:00]} Be7 {[%emt 0:00:03]} 68. Bd2 {[%emt 0:00:06]} Nd5 {[%emt 0:00:10]} 69. Kf2 {[%emt 0:00:02]} Kg6 {[%emt 0:00:03]} 70. Kf3 {[%emt 0:00:08]} Kf5 {[%emt 0:00:08]} 71. Nc3 {[%emt 0:00:01]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "15.8"]
[White "Khademalsharieh, Sarasadat"]
[Black "Badelka, Olga"]
[Result "1/2-1/2"]
[ECO "A13"]
[WhiteElo "2494"]
[BlackElo "2433"]
[Annotator "ChessBase"]
[PlyCount "104"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. Nf3 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. e3 {[%emt 0:00:02]} d5 {[%emt 0:00:00]} 3. c4 {[%emt 0:00:01]} e6 {[%emt 0:00:06]} 4. b3 {[%emt 0:00:02]} c5 {[%emt 0:00:05]} 5. cxd5 {[%emt 0:00:02]} exd5 {[%emt 0:00:06]} 6. d4 {[%emt 0:00:13]} Nc6 {[%emt 0:00:02]} 7. Be2 {[%emt 0:00:29]} Bg4 {[%emt 0:00:14]} 8. dxc5 {[%emt 0:00:13]} Bxc5 {[%emt 0:00:06]} 9. O-O {[%emt 0:00:03]} O-O {[%emt 0:00:28]} 10. Bb2 {[%emt 0:00:04]} Re8 {[%emt 0:00:26]} 11. Nc3 {[%emt 0:00:43]} Rc8 {[%emt 0:00:29]} 12. Nb5 {[%emt 0:00:07]} a6 {[%emt 0:00:29]} 13. Nbd4 {[%emt 0:00:01]} Ne4 {[%emt 0:00:42]} 14. Rc1 {[%emt 0:00:03]} Qb6 {[%emt 0:00:44]} 15. h3 {[%emt 0:01:10]} Bd7 {[%emt 0:00:17]} 16. Nxc6 {[%emt 0:00:11]} bxc6 {[%emt 0:00:21]} 17. Bd4 {[%emt 0:00:38]} Bxd4 {[%emt 0:00:13]} 18. Qxd4 {[%emt 0:00:04]} Qxd4 {[%emt 0:00:16]} 19. exd4 {[%emt 0:00:02]} f6 {[%emt 0:01:40]} 20. Bd3 {[%emt 0:00:29]} a5 {[%emt 0:00:32]} 21. Rc2 {[%emt 0:00:28]} Ra8 {[%emt 0:00:28]} 22. Nd2 {[%emt 0:01:06]} Nxd2 {[%emt 0:00:26]} 23. Rxd2 {[%emt 0:00:02]} a4 {[%emt 0:00:02]} 24. bxa4 {[%emt 0:00:42]} Rxa4 {[%emt 0:00:02]} 25. Bc2 {[%emt 0:00:03]} Rb4 {[%emt 0:00:26]} 26. Bb3 {[%emt 0:00:10]} Kf7 {[%emt 0:00:56]} 27. f3 {[%emt 0:00:03]} f5 {[%emt 0:00:15]} 28. Kf2 {[%emt 0:00:11]} f4 {[%emt 0:00:05]} 29. Re1 {[%emt 0:00:11]} Rxe1 {[%emt 0:00:12]} 30. Kxe1 {[%emt 0:00:01]} Ke7 {[%emt 0:00:11]} 31. Kd1 {[%emt 0:00:06]} Bf5 {[%emt 0:00:28]} 32. Kc1 {[%emt 0:00:02]} Kd6 {[%emt 0:00:25]} 33. Kb2 {[%emt 0:00:02]} Rb7 {[%emt 0:00:18]} 34. Re2 {[%emt 0:00:16]} Bd3 {[%emt 0:00:05]} 35. Re5 {[%emt 0:00:35]} h6 {[%emt 0:00:11]} 36. h4 {[%emt 0:00:31]} Re7 {[%emt 0:00:20]} 37. Kc3 {[%emt 0:00:04]} Bf1 {[%emt 0:00:04]} 38. Rf5 {[%emt 0:00:07]} Bxg2 {[%emt 0:00:22]} 39. Rxf4 {[%emt 0:00:01]} g5 {[%emt 0:00:12]} 40. hxg5 {[%emt 0:00:25]} hxg5 {[%emt 0:00:00]} 41. Rg4 {[%emt 0:00:21]} Bxf3 {[%emt 0:00:03]} 42. Rxg5 {[%emt 0:00:01]} Kc7 {[%emt 0:00:04]} 43. Kb4 {[%emt 0:00:08]} Kb6 {[%emt 0:00:02]} 44. a4 {[%emt 0:00:03]} Ra7 {[%emt 0:00:22]} 45. Rg6 {[%emt 0:00:11]} Be4 {[%emt 0:00:02]} 46. Rf6 {[%emt 0:00:03]} Ra8 {[%emt 0:00:03]} 47. Bd1 {[%emt 0:00:10]} Ra7 {[%emt 0:00:04]} 48. Bg4 {[%emt 0:00:04]} Bd3 {[%emt 0:00:05]} 49. Bh5 {[%emt 0:00:05]} Bc2 {[%emt 0:00:03]} 50. a5+ {[%emt 0:00:31]} Rxa5 {[%emt 0:00:01]} 51. Rxc6+ {[%emt 0:00:01]} Kxc6 {[%emt 0:00:01]} 52. Kxa5 {[%emt 0:00:05]} Be4 {[%emt 0:00:03]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "15.9"]
[White "Abdusattorov, Nodirbek"]
[Black "Nihal Sarin"]
[Result "0-1"]
[ECO "C68"]
[WhiteElo "2627"]
[BlackElo "2620"]
[Annotator "TA"]
[PlyCount "102"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 17,102,0,6,0,22,-22,-8,-24,-25,-24,-9,-16,26,23,18,22,30,19,46,25,27,2,55,39,57,11,20,15,26,26,18,0,0,0,33,35,77,102,92,0,0,0,0,0,99,0,68,69,56,0,0,0,0,0,0,-21,-62,-402,-400,-441,-434,-489,-462,-481,-481,-776,-831,-777,-512,-916,-908,-1550,-1521,-1418,0,-389,0,-1683,-1581,-29976,-29977,-29978,-29979,-29978,-29980,-29990,-29991]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Bxc6 dxc6 5. O-O Bd6 6. d4 exd4 7. Qxd4 f6 8. Be3 Ne7 9. Nbd2 Be6 10. Qc3 {C68: Ruy Lopez: Exchange Variation, sidelines.} Ng6 11. Rad1 Qe7 12. Nd4 {The position is equal.} Bb4 13. Qd3 Ne5 ({Not} 13... Bxa2 $2 14. c3 $18) 14. Qe2 {[#]} Bxd2 $5 $146 {[%mdl 8] New and interesting.} ({Predecessor:} 14... O-O-O 15. Nxe6 Qxe6 16. a3 Bxd2 17. Bxd2 Nc4 18. Bc1 Rxd1 19. Rxd1 Re8 20. Re1 Nd6 {½-½ (36) Guseinov,G (2634)-Khairullin,I (2652) Skopje 2015}) 15. Qxd2 O-O-O {[#] ...c5 is the strong threat.} 16. Qc3 g5 17. f3 Rhg8 18. b3 h5 19. Rd2 Rd7 (19... Bd7 $11) 20. Rfd1 Rgd8 21. Nxe6 Rxd2 22. Rxd2 Rxd2 23. Qxd2 {Strongly threatening Nd4.} Qxe6 24. Bd4 b6 25. Kf2 c5 26. Bc3 a5 27. Qd5 Qe7 28. h4 (28. Bxe5 $16 fxe5 29. Qa8+ Kd7 30. Qd5+ Kc8 31. Qa8+ Kd7 32. Qh8) 28... gxh4 $11 29. f4 Ng4+ 30. Ke2 Qe8 (30... Qh7 $11) 31. Be1 (31. Qa8+ $16 Kd7 32. Qxe8+ Kxe8 33. Be1) 31... Kb8 (31... Qg6 $1 $11) 32. Bxh4 $14 a4 33. e5 ({White should try} 33. f5 $14) 33... axb3 34. axb3 fxe5 35. f5 Qb5+ 36. Qd3 Qc6 37. Qf3 {[%mdl 8192] White is on the road to losing.} (37. Kf1 $15) 37... e4 $19 38. Qf4 e3 39. Qf3 {[#]} Qb5+ 40. c4 Qxb3 41. Qd5 (41. Qe4 $142 Qb2+ 42. Kf3) 41... Qc2+ 42. Kf3 Qb1 {White must now prevent ...Qf1+.} 43. Kf4 (43. Ke2 $142 Qc2+ 44. Kf3) 43... e2 44. Qd8+ Kb7 45. Qd5+ Kb8 $2 (45... Ka7 46. Kg5 Qc1+ 47. Kg6 Qf4) 46. Qd8+ Kb7 $2 (46... Ka7 47. Kg5 e1=Q 48. Bxe1 Qxe1 49. Qxc7+ Ka6) 47. Qd5+ $1 Ka7 {( -> ...Qc1+)} 48. Qd2 Qf1+ {Black mates.} 49. Kg5 Nf2 50. Qf4 Qxg2+ 51. Bg3 Nh3+ {[%mdl 64] Double Attack.  Weighted Error Value: White=0.60/Black=0.54} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "15.10"]
[White "Murzin, Volodar"]
[Black "Mammadzada, Gunay"]
[Result "1-0"]
[ECO "B53"]
[WhiteElo "2478"]
[BlackElo "2443"]
[Annotator "ChessBase"]
[PlyCount "85"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d6 {[%emt 0:00:00]} 3. d4 {[%emt 0:00:00]} cxd4 {[%emt 0:00:00]} 4. Qxd4 {[%emt 0:00:02]} Nf6 {[%emt 0:00:01]} 5. Be2 {[%emt 0:00:03]} Nc6 {[%emt 0:00:23]} 6. Qe3 {[%emt 0:00:03]} g6 {[%emt 0:00:01]} 7. O-O {[%emt 0:00:02]} Bg7 {[%emt 0:00:08]} 8. Rd1 {[%emt 0:00:02]} O-O {[%emt 0:00:11]} 9. Nc3 {[%emt 0:00:03]} Nd7 {[%emt 0:00:53]} 10. Nd5 {[%emt 0:00:47]} a6 {[%emt 0:00:10]} 11. c3 {[%emt 0:00:25]} b6 {[%emt 0:01:07]} 12. Qf4 {[%emt 0:00:56]} Bb7 {[%emt 0:00:19]} 13. Qg3 {[%emt 0:00:05]} Nce5 {[%emt 0:01:01]} 14. Bg5 {[%emt 0:00:51]} Re8 {[%emt 0:02:50]} 15. Nxe5 {[%emt 0:00:40]} Bxe5 {[%emt 0:00:08]} 16. Qh4 {[%emt 0:00:24]} Bxd5 {[%emt 0:00:11]} 17. exd5 {[%emt 0:00:11]} Bf6 {[%emt 0:00:04]} 18. a4 {[%emt 0:00:08]} Qc7 {[%emt 0:00:26]} 19. Rd3 {[%emt 0:00:54]} Bxg5 {[%emt 0:01:14]} 20. Qxg5 {[%emt 0:00:03]} Nf6 {[%emt 0:00:01]} 21. Rd4 {[%emt 0:00:09]} Kg7 {[%emt 0:00:53]} 22. Rad1 {[%emt 0:00:22]} Qc5 {[%emt 0:00:18]} 23. Rc4 {[%emt 0:01:17]} Qa5 {[%emt 0:00:19]} 24. Qd2 {[%emt 0:00:16]} Rec8 {[%emt 0:00:35]} 25. Rd4 {[%emt 0:00:10]} b5 {[%emt 0:00:06]} 26. axb5 {[%emt 0:01:23]} axb5 {[%emt 0:00:00]} 27. h3 {[%emt 0:00:06]} Rab8 {[%emt 0:00:12]} 28. Bf1 {[%emt 0:00:28]} Rc7 {[%emt 0:00:25]} 29. Qe1 {[%emt 0:00:11]} Qa2 {[%emt 0:00:06]} 30. Qd2 {[%emt 0:01:28]} Rc5 {[%emt 0:00:05]} 31. f4 {[%emt 0:00:40]} b4 {[%emt 0:00:20]} 32. cxb4 {[%emt 0:00:02]} Rc7 {[%emt 0:00:03]} 33. b5 {[%emt 0:00:02]} Qa7 {[%emt 0:00:03]} 34. Kh2 {[%emt 0:00:08]} Rbc8 {[%emt 0:00:01]} 35. Qb4 {[%emt 0:00:12]} Qb6 {[%emt 0:00:02]} 36. Ra1 {[%emt 0:00:13]} Rc1 {[%emt 0:00:03]} 37. Ra6 {[%emt 0:00:03]} Qb7 {[%emt 0:00:15]} 38. Be2 {[%emt 0:00:02]} h5 {[%emt 0:00:08]} 39. Rc6 {[%emt 0:00:08]} h4 {[%emt 0:00:05]} 40. Bf3 {[%emt 0:00:07]} Kh7 {[%emt 0:00:03]} 41. Qd2 {[%emt 0:00:06]} Ra1 {[%emt 0:00:04]} 42. f5 {[%emt 0:00:02]} Rca8 {[%emt 0:00:13]} 43. Rxh4+ {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "16.1"]
[White "Zhu, Jiner"]
[Black "Mammadzada, Gunay"]
[Result "1-0"]
[ECO "B52"]
[WhiteElo "2459"]
[BlackElo "2443"]
[Annotator "TA"]
[PlyCount "149"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,149,20,31,11,24,14,28,0,8,-3,0,0,0,-16,0,-5,-5,-42,0,0,0,-60,24,-40,-37,-37,-35,-40,-30,-35,-19,-33,-21,-25,-22,-91,-4,-16,15,14,18,0,25,31,37,39,57,76,64,93,76,0,0,0,0,0,0,0,60,48,51,43,37,54,55,14,14,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-227,0,0,0,-89,0,-7,0,-14,0,0,0,0,22,0,0,0,22,22,22,22,397,378,350,266,272,166,489,281,318,301,444,443,460,454,830,777,710,543,822,821,872,817,841,830,1394,804,772,708,758,0,745,467,1820,1270,29984,1367]} 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Nxd7 5. O-O Ngf6 6. Qe2 Rc8 7. Rd1 {B52: Sicilian: Moscow Variation with 3...Bd7.} g6 {[#]} 8. b3 $146 ({Predecessor:} 8. c3 Bh6 9. b3 O-O 10. Bb2 Qc7 11. c4 e5 12. Nc3 Rfe8 13. Ne1 Nf8 14. Nc2 Ne6 {1-0 (35) Satyapragyan,S (2416)-Efroimski,M (2255) Douglas 2015}) 8... Bg7 9. Bb2 {White has an edge.} e5 10. c4 Nf8 11. Nc3 Ne6 12. Nd5 Nh5 13. g3 O-O 14. Ne1 Qe8 15. Ng2 f5 16. f3 ({Better is} 16. exf5 $11 gxf5 17. Nh4) 16... Qf7 (16... f4 $15 17. g4 Nf6) 17. Rf1 (17. exf5 $11 gxf5 18. Nh4) 17... f4 $15 18. g4 Nf6 19. h4 Nd7 20. a3 Nb8 21. Ne1 Nc6 22. Nc2 Na5 23. Qd3 (23. Rab1 $11) 23... Rfd8 (23... Bf6 $17 24. g5 (24. Nxf6+ Qxf6 25. g5 Qe7 $15) 24... Bg7) 24. Kg2 $11 a6 25. Rab1 Nc6 26. b4 h6 27. Qe2 Kh7 28. Bc3 Ned4 29. Bxd4 exd4 30. bxc5 dxc5 31. d3 (31. Rfc1 $16) 31... Ne5 32. Rb6 Rc6 33. Rfb1 Rd7 34. Ne1 g5 (34... Bf6 $11) 35. h5 Rxb6 36. Rxb6 Nc6 37. Qb2 Be5 38. Kf2 Bb8 39. Qd2 Ba7 40. Rb1 Ne5 41. Ke2 Qe6 42. Kf1 Kg7 43. Rb3 Rf7 44. Qb2 Qd7 45. Qb1 Qc6 46. Ke2 Qd7 47. Rb2 $2 (47. Kf1 $11 {and White has nothing to worry.}) 47... Kf8 $2 (47... Nxg4 $1 $19 {White must now prevent ...Ne3.} 48. Kd2 (48. fxg4 $2 Qxg4+ 49. Kd2 b5 $19) 48... Ne5) 48. Kf2 Qc6 49. Qd1 (49. Kf1 $11) 49... Ke8 ({Black should play} 49... b5 $17 50. Qc2 Rb7) 50. Kf1 Kd8 51. Rb1 Kc8 52. Nc2 Kb8 53. Na1 Ka8 54. Nb3 Qa4 55. Ke2 Qxa3 56. Qc2 {And now Ra1 would win.} Qa4 {[#]} 57. Nxd4 $1 {[%mdl 64] Discovered Attack} Qd7 {[%mdl 8192] White stays focused until the end.} (57... Qxc2+ $1 $11 58. Nxc2 Nc6) 58. Nf5 $18 Nc6 {Threatens to win with ...Rxf5!} 59. Kf2 Qe6 60. Qb2 {Hoping for Qh8+.} Bb8 $2 (60... Rh7 61. Qc3 Qe5) 61. Qa3 ({Weaker is} 61. Nb6+ Ka7 $18) (61. Qh8 $142 {aiming for Nd6!} Qe5 62. Qc8) 61... Ba7 62. Kg2 $1 Qe5 (62... Rd7 $142 63. Qb2 Qe5 64. Qxe5 Nxe5 65. Nxh6 Nxd3) 63. Nxh6 Rd7 64. Nf5 Nd4 (64... Rh7 $142 65. h6 Qh8) 65. Nxd4 Qxd4 66. Rb3 Qg7 67. Qb2 Qh6 68. Qe5 {White wants to mate with Qe8+.} Bb8 69. Qe8 Rg7 70. Nb6+ Ka7 71. Nc8+ Ka8 72. Nb6+ Ka7 73. Nd7 {[%csl Gd7][%cal Re8b8]} Bc7 (73... Qd6 $142 74. Nxb8 Qxb8 75. Qxb8+ Kxb8) 74. Nxc5 {[%csl Gc5][%cal Rb3b7]} b6 {[#]} 75. Ne6 {Weighted Error Value: White=0.25/Black=0.38} (75. Nxa6 $142 $1 {[%mdl 512]} Qd6 {[#]} 76. c5 $1 Qd8 77. Qa4 Kb7 78. Nxc7 Qxc7 79. Rxb6+ Kc8 80. Qa8+ Kd7 81. Rb7) 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "16.2"]
[White "Nihal Sarin"]
[Black "Murzin, Volodar"]
[Result "0-1"]
[ECO "D12"]
[WhiteElo "2620"]
[BlackElo "2478"]
[Annotator "TA"]
[PlyCount "88"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,88,21,29,28,26,26,46,23,31,18,25,7,0,1,7,12,12,0,0,0,0,0,12,0,15,13,14,0,15,9,23,0,16,0,22,16,22,0,0,-3,0,-46,-42,-43,-38,-147,-156,-155,-142,-275,-248,-242,-245,-482,-468,-506,-498,-496,-308,-425,-396,-381,-408,-427,-425,-564,-563,-997,-993,-29987,-29988,-29988,-29989,-29991,-29992]} 1. Nf3 Nf6 2. c4 c6 3. d4 d5 4. e3 Bf5 5. Nc3 e6 6. Nh4 Be4 7. f3 Bg6 8. Qb3 Qc7 9. Bd2 {D12: Slav Defence: 3 Nf3 Nf6 4 e3 Bf5.} Nbd7 {[%cal Bb8d7,Bd7f8,Bf8e6][%mdl 32]} 10. cxd5 exd5 11. Rc1 {White is slightly better.} Be7 12. g3 Qb6 {[#]} 13. Nxg6 $146 ({Predecessor:} 13. Qxb6 axb6 14. Nxg6 hxg6 15. a4 Bb4 16. b3 Nf8 17. Bd3 Ne6 18. Rc2 O-O 19. Kf2 {1-0 (37) Henrichs,T (2483)-Ducarmon,Q (2368) Maastricht 2012}) 13... hxg6 14. Kf2 Nf8 15. Qxb6 axb6 16. a3 Ne6 17. Bd3 g5 18. h3 g6 19. Ne2 Kf8 20. Kg2 Kg7 21. Bc3 Rhd8 22. Rhd1 Kg8 23. Rd2 Bf8 24. Rf1 Bg7 25. Rdd1 b5 26. Bb1 Ne8 27. f4 gxf4 28. exf4 Nd6 29. g4 Re8 30. Ng3 {White is now going downhill.} (30. Rde1 $15) 30... Nc4 $17 {...Ne3+ is the strong threat.} 31. Kf3 c5 {[%cal Rg7d4]} 32. dxc5 (32. Ne2 $17) 32... Bxc3 $19 {[%mdl 64] [#] Overworked Piece} ({Less strong is} 32... Nxb2 33. Bxb2 Bxb2 34. Rxd5 $17) 33. bxc3 Rxa3 34. Ne2 (34. Rfe1 {is the only way for White.}) 34... d4 {[%mdl 64] Deflection} 35. Nxd4 Rxc3+ 36. Kf2 Ne3 37. Nxb5 Nxd1+ {[%mdl 64] Discovered Attack} 38. Rxd1 Rxh3 39. Nd6 Rd8 40. Rc1 {[#]} Nxc5 $1 {[%mdl 512]} 41. Nxf7 (41. Rxc5 Rxd6) 41... Rd2+ 42. Ke1 Rb2 {[%cal Rh3h1] Black mates.} 43. Bc2 Kxf7 44. Kd2 Nb3+ {[%mdl 64] Double Attack.  Weighted Error Value: White=0.59/Black=0.08} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "16.3"]
[White "Badelka, Olga"]
[Black "Abdusattorov, Nodirbek"]
[Result "0-1"]
[ECO "E18"]
[WhiteElo "2433"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "88"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 14,88,25,12,21,0,33,14,68,60,66,14,19,-22,10,16,20,27,33,6,13,20,17,18,87,58,67,60,68,62,114,61,68,63,62,53,82,72,72,-12,-8,-7,-7,-37,305,-52,0,0,0,0,0,0,0,0,177,168,182,176,180,-8,-8,-8,-8,-8,0,-533,-20,-583,-572,-621,-580,-1502,-1256,-29987,-29986,-29989,-29990]} 1. Nf3 Nf6 2. g3 b6 3. Bg2 Bb7 4. d4 e6 5. O-O Be7 6. c4 O-O 7. Nc3 Na6 8. Re1 Ne4 {E18: Queen's Indian: Old Main Line (4 g3 Bb7 5 Bg2 Be7 6 0-0 0-0 7 Nc3).} 9. Bd2 Bf6 $5 {[%mdl 4] [#] A promising side line.} 10. Qc2 $146 ({Predecessor:} 10. Rc1 d6 11. a3 c5 12. d5 Nxd2 13. Qxd2 e5 14. Ne4 Be7 15. b4 Rb8 16. Rb1 {½-½ (30) Schreiner,P (2471)-Atlas,V (2453) Austria 2014}) 10... Nxc3 (10... Nxd2 $11 11. Qxd2 d5) 11. Bxc3 $14 {Threatens to win with Ng5!} d5 12. Ne5 ({Better is} 12. c5 $14) 12... c5 $11 13. e3 Bxe5 14. dxe5 Nc7 15. Rad1 Qe7 16. f4 Rad8 17. Qa4 a6 18. Qc2 b5 (18... Rd7 $11 {keeps the balance.}) 19. b3 b4 20. Bb2 Ba8 21. cxd5 Nxd5 (21... Bxd5 $14 22. e4 Bb7) 22. Rc1 (22. e4 $16 Nb6 23. Bc1) 22... Rc8 $14 23. e4 Nb6 24. Qd3 c4 25. bxc4 Rfd8 26. Qe2 ({White should try} 26. Bd4 $16) 26... Qc5+ 27. Kh1 a5 28. f5 Nxc4 $2 {[%mdl 8192]} (28... Bb7 $15) 29. f6 $2 (29. Bf1 exf5 30. Qxc4 Bxe4+ 31. Rxe4 Qf8 $16) (29. fxe6 $1 $18 fxe6 30. Bh3 (30. Bf1 Qf8 $18)) 29... Rd2 (29... Bb7 $1 $15) 30. Qxd2 $1 $11 Nxd2 31. Rxc5 Rxc5 32. Rd1 $1 {[%cal Rd1d2]} Rc2 33. Bc1 gxf6 $2 (33... h6 $11 {and Black has nothing to worry.} 34. Bxd2 Rxa2) 34. exf6 $18 h5 35. Bxd2 {Black must now prevent Bg5.} Rxa2 36. Be3 $2 (36. Bf4 $18 b3 37. Be5) 36... b3 $11 37. Bd4 ({Much worse is} 37. Rd8+ Kh7 $17) 37... a4 38. Bf3 $1 a3 {aiming for ...Rc2.} 39. Be5 $2 {[%mdl 8192] [#]} ({Wrong is} 39. Bxh5 $2 Bxe4+ 40. Kg1 Rg2+ 41. Kf1 Rxh2 $19) (39. Rb1 $1 $11 b2 40. Kg2) 39... b2 $2 (39... Bc6 $1 $19 40. Rb1 (40. Bxh5 $2 Bxe4+ 41. Kg1 Rg2+ 42. Kf1 b2 $19) 40... b2) 40. Rb1 $2 {[%mdl 8192]} (40. Kg1 $11 {and White stays safe.}) 40... Bc6 $19 41. Kg1 {[#] and the idea Kf1 leaves White hopeful.} Bb5 42. Bd1 {Strongly threatening Bb3.} Bd3 $1 {[%csl LRb1,LRe4][%mdl 64] Double Attack} 43. Bb3 Bxb1 44. Bxa2 Bxa2 {Weighted Error Value: White=0.95/Black=0.58} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "16.4"]
[White "Lei, Tingjie"]
[Black "Khademalsharieh, Sarasadat"]
[Result "1-0"]
[ECO "E04"]
[WhiteElo "2505"]
[BlackElo "2494"]
[Annotator "ChessBase"]
[PlyCount "53"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. g3 {[%emt 0:00:00]} d5 {[%emt 0:00:02]} 4. Bg2 {[%emt 0:00:02]} Bb4+ {[%emt 0:00:02]} 5. Bd2 {[%emt 0:00:03]} a5 {[%emt 0:00:01]} 6. Nf3 {[%emt 0:00:15]} dxc4 {[%emt 0:00:40]} 7. Qc2 {[%emt 0:00:26]} c5 {[%emt 0:00:57]} 8. Qxc4 {[%emt 0:00:42]} Bxd2+ {[%emt 0:01:21]} 9. Nbxd2 {[%emt 0:00:04]} cxd4 {[%emt 0:00:01]} 10. Nxd4 {[%emt 0:00:01]} O-O {[%emt 0:00:02]} 11. N2f3 {[%emt 0:01:32]} Qb6 {[%emt 0:00:46]} 12. O-O {[%emt 0:00:26]} Bd7 {[%emt 0:01:15]} 13. Ne5 {[%emt 0:00:44]} Rc8 {[%emt 0:00:03]} 14. Qd3 {[%emt 0:00:11]} Be8 {[%emt 0:00:07]} 15. Rfd1 {[%emt 0:02:14]} Nbd7 {[%emt 0:02:06]} 16. Nc4 {[%emt 0:00:42]} Qa6 {[%emt 0:00:09]} 17. Rac1 {[%emt 0:00:05]} Nc5 {[%emt 0:00:46]} 18. Qf3 {[%emt 0:00:27]} Nce4 {[%emt 0:00:22]} 19. Qd3 {[%emt 0:00:39]} Nc5 {[%emt 0:00:15]} 20. Qa3 {[%emt 0:00:07]} a4 {[%emt 0:00:23]} 21. Rc2 {[%emt 0:01:28]} Rab8 {[%emt 0:00:11]} 22. Rdc1 {[%emt 0:00:07]} Nd5 {[%emt 0:01:31]} 23. Ne5 {[%emt 0:00:19]} b6 {[%emt 0:00:31]} 24. b4 {[%emt 0:00:17]} Nd7 {[%emt 0:00:02]} 25. Nec6 {[%emt 0:00:15]} N7f6 {[%emt 0:00:19]} 26. b5 {[%emt 0:00:07]} Qb7 {[%emt 0:00:14]} 27. e4 {[%emt 0:00:01]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "16.5"]
[White "Yip, Carissa"]
[Black "Abdumalik, Zhansaya"]
[Result "0-1"]
[ECO "A34"]
[WhiteElo "2430"]
[BlackElo "2472"]
[Annotator "TA"]
[PlyCount "110"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,110,40,47,52,46,44,39,63,28,49,49,54,45,99,35,47,22,0,-23,49,32,37,35,59,54,62,5,43,50,66,0,0,0,0,-205,-208,-192,-103,-443,-414,-1071,-564,-576,-571,-570,-567,-543,-535,-547,0,-756,-738,-901,-678,-671,-667,-656,-643,-779,-774,-876,-768,-821,-806,-1197,-1175,-1227,-1214,-1282,-1263,-5197,-4794,-6399,-6387,-1698,-1164,-1104,-1084,-1188,-1185,-1591,-1090,-1508,-1079,-1132,-1138,-5285,-929,-1277,-758,-1281,-1240,-1027,-680,-640,-630,-589,-530,-634,-631]} 1. e4 c5 2. Nf3 a6 3. c4 e6 4. Nc3 b6 5. d4 cxd4 6. Nxd4 Bb7 7. Bd3 Qc7 {A34: Symmetrical English: 2 Nc3, lines with ...d5.} 8. O-O Nf6 9. Qe2 d6 {White is slightly better.} 10. Kh1 Nbd7 11. f4 Be7 12. Bd2 g6 (12... O-O $14) 13. b4 ({Better is} 13. Rae1 $16) 13... Rc8 {[#]} 14. f5 $146 ({Predecessor:} 14. Rae1 O-O 15. a3 Rfe8 16. f5 exf5 17. exf5 d5 18. fxg6 hxg6 19. Nxd5 Bxd5 20. cxd5 {1-0 (31) Kozirev,A (2343)-Fesenko,V (2221) Cheliabinsk 2010}) 14... gxf5 {[#] aiming for ...Ne5.} 15. exf5 (15. Nd5 $5 Qd8 16. Nxe7 Qxe7 17. exf5 $11) 15... e5 (15... Rg8 $1 $11 16. Rf2 (16. fxe6 Bxg2+ 17. Qxg2 Rxg2 $15) 16... e5) 16. Nf3 Rg8 17. Rac1 Qb8 18. Ng5 Qa8 19. Nge4 (19. Rg1 $14) 19... Nxe4 20. Bxe4 ({Don't play} 20. Nxe4 Nf6 $15) 20... Nf6 21. Bxb7 (21. Bf3 $14) 21... Qxb7 $11 22. Be3 Rxc4 23. Rc2 $2 (23. b5 $11 {and White stays safe.}) 23... Rcg4 $19 24. Rg1 Rh4 $40 {[%mdl 128] Black is out for blood.} (24... b5 $19 25. a3 h5) 25. b5 $2 {[%mdl 8192]} (25. Rgc1 $17) 25... Ng4 {[%csl Gg4][%cal Rh4h2]} 26. Rgc1 (26. Rf1 $142 Rxh2+ 27. Kg1 Nxe3 28. Kxh2 Rxg2+ 29. Qxg2 Nxg2 30. Rxg2) 26... Rxh2+ 27. Kg1 Nxe3 28. Kxh2 Rxg2+ 29. Qxg2 Nxg2 30. Rxg2 {intending bxa6.} a5 (30... Qf3 $19 31. Rcc2 a5) 31. Rd1 $2 {[%mdl 8192]} (31. Rg8+ $11 Bf8 32. Ne2) 31... Qf3 {[%mdl 64] [#] Double Attack. Black is clearly winning.} 32. Ne2 Qh5+ 33. Kg1 Bg5 {( -> ...Be3+)} 34. Rd3 h6 35. Nc3 Qh4 36. Nd5 Qe1+ 37. Kh2 Qe4 38. Rd1 Qxf5 39. Rgg1 Qc2+ 40. Kh3 Qxa2 41. Nxb6 Qb3+ 42. Kg4 Qe6+ 43. Kg3 Bf4+ 44. Kf2 Qa2+ 45. Kf1 Bg5 46. Nd5 Kd7 47. b6 Kc6 48. Rg3 Bh4 49. Rc3+ Kd7 {[%csl Gh4][%cal Ra2f2]} 50. Kg1 Qf2+ 51. Kh1 Bg3 {[%csl Gg3][%cal Rf2h2]} 52. Nf6+ Qxf6 53. Rxg3 Qh4+ 54. Kg2 Qb4 55. Rf3 f5 {Weighted Error Value: White=1.01/Black=0.51} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "16.6"]
[White "Praggnanandhaa R"]
[Black "Mendonca, Leon Luke"]
[Result "1-0"]
[ECO "D12"]
[WhiteElo "2608"]
[BlackElo "2549"]
[Annotator "TA"]
[PlyCount "101"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,101,29,25,0,59,47,83,67,69,20,46,40,66,63,64,56,99,89,122,122,151,140,152,102,92,91,145,85,162,167,191,164,171,154,201,181,193,94,100,92,93,99,93,62,64,64,71,62,80,58,58,58,70,60,171,169,460,466,550,543,691,702,712,712,709,706,701,691,651,473,727,678,2193,1946,1830,1536,1844,1748,1676,1453,1841,1802,1719,1673,1472,1311,1193,1157]} 1. d4 Nf6 2. c4 c6 3. Nf3 d5 4. e3 Bf5 5. Nc3 e6 6. Nh4 Be4 7. f3 Bg6 8. Qb3 Qc7 9. cxd5 {D12: Slav Defence: 3 Nf3 Nf6 4 e3 Bf5.} Nxd5 (9... cxd5 $11 10. Bd2 (10. Nxg6 hxg6 11. Bd2 Nc6 $11) 10... Nc6) 10. g3 Be7 11. Nxg6 {White is better.} hxg6 {[#]} 12. Kf2 $146 (12. e4 $5 {[%cal Re4d5]} Nf6 13. Be2 $14) ({Predecessor:} 12. e4 Nxc3 13. bxc3 Nd7 14. Kf2 Rb8 15. a4 g5 16. Be2 e5 17. Be3 O-O 18. Rhd1 {1-0 (67) Matlakov,M (2653)-Dubov,D (2614) Loo 2013}) 12... Nd7 13. e4 N5f6 14. Kg2 O-O 15. Be2 c5 16. Bf4 Qa5 17. d5 e5 18. Bg5 Qc7 19. Rac1 a6 20. a4 Bd6 ({Black should try} 20... Rfc8) 21. Nb1 (21. Bd2 $142) 21... Rab8 (21... Rfb8 $16) 22. Na3 $18 Rfc8 23. Rc2 Ne8 24. h4 Ndf6 25. Rhc1 Be7 26. a5 (26. Qe3 $18 {and White stays clearly on top.}) 26... Qxa5 $16 27. Nc4 {[%mdl 64] [#] Double Attack} Qc7 28. Nb6 Rd8 29. Be3 {[%cal Re3c5]} Nd7 30. Nxd7 Qxd7 31. Qb6 Rdc8 32. Bf1 {[%mdl 1024] White has strong compensation.} Bd8 33. Qb3 Be7 34. Kh2 {aiming for Bh3.} b5 {White leaves nothing to chance now.} (34... Rc7 $14) 35. Bh3 $18 Qc7 {[#]} (35... f5) 36. Bxc8 {[%cal Re3c5] White is clearly winning.} Rxc8 37. Bxc5 Bxc5 38. Rxc5 Qxc5 39. Rxc5 Rxc5 {[%mdl 4096] Endgame KQ-KRN} 40. Qa3 Rc2+ 41. Kh3 Nf6 42. d6 Rf2 (42... Kh7 $142 43. Qxa6 b4) 43. Qxa6 Rxf3 44. Qc8+ Kh7 45. d7 Nxd7 46. Qxd7 {KQ-KR} b4 47. Qe7 b3 48. Qxe5 Rd3 49. Qb5 Re3 50. Qc4 f6 51. Kg2 {Weighted Error Value: White=0.21/Black=0.44} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "16.7"]
[White "Salimova, Nurgyul"]
[Black "Keymer, Vincent"]
[Result "0-1"]
[ECO "E11"]
[WhiteElo "2397"]
[BlackElo "2591"]
[Annotator "ChessBase"]
[PlyCount "64"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. c4 {[%emt 0:00:04]} d5 {[%emt 0:00:00]} 4. g3 {[%emt 0:00:01]} Bb4+ {[%emt 0:00:02]} 5. Bd2 {[%emt 0:00:02]} Be7 {[%emt 0:00:02]} 6. Bg2 {[%emt 0:00:06]} O-O {[%emt 0:00:01]} 7. O-O {[%emt 0:00:20]} c6 {[%emt 0:00:01]} 8. Bf4 {[%emt 0:00:07]} dxc4 {[%emt 0:00:04]} 9. Ne5 {[%emt 0:00:21]} b5 {[%emt 0:00:01]} 10. Nxc6 {[%emt 0:01:10]} Nxc6 {[%emt 0:00:03]} 11. Bxc6 {[%emt 0:00:01]} Ba6 {[%emt 0:00:00]} 12. Bxa8 {[%emt 0:01:04]} Qxa8 {[%emt 0:00:00]} 13. Nd2 {[%emt 0:01:04]} h6 {[%emt 0:01:04]} 14. Nf3 {[%emt 0:00:07]} Qd5 {[%emt 0:00:05]} 15. h4 {[%emt 0:01:12]} Bb7 {[%emt 0:00:17]} 16. Re1 {[%emt 0:01:23]} Ne4 {[%emt 0:00:11]} 17. h5 {[%emt 0:01:15]} Qxh5 {[%emt 0:00:16]} 18. Kg2 {[%emt 0:00:01]} Qd5 {[%emt 0:01:07]} 19. Rh1 {[%emt 0:00:22]} Rd8 {[%emt 0:00:05]} 20. Qc2 {[%emt 0:01:34]} Qf5 {[%emt 0:00:44]} 21. Qc1 {[%emt 0:00:27]} Ng5 {[%emt 0:00:34]} 22. Bxg5 {[%emt 0:00:47]} hxg5 {[%emt 0:00:02]} 23. Qg1 {[%emt 0:00:16]} g4 {[%emt 0:00:45]} 24. Qh2 {[%emt 0:00:01]} gxf3+ {[%emt 0:00:01]} 25. Kg1 {[%emt 0:00:02]} f6 {[%emt 0:00:03]} 26. e3 {[%emt 0:00:04]} Be4 {[%emt 0:00:17]} 27. Qh4 {[%emt 0:00:07]} Kf7 {[%emt 0:00:12]} 28. Rc1 {[%emt 0:00:12]} Bd3 {[%emt 0:00:18]} 29. a3 {[%emt 0:00:05]} a5 {[%emt 0:00:06]} 30. g4 {[%emt 0:00:02]} Qg6 {[%emt 0:00:08]} 31. Qg3 {[%emt 0:00:04]} Bd6 {[%emt 0:00:02]} 32. Qh4 {[%emt 0:00:12]} Rh8 {[%emt 0:00:04]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "16.9"]
[White "Liang, Awonder"]
[Black "Bjerre, Jonas Buhl"]
[Result "1-0"]
[ECO "B23"]
[WhiteElo "2592"]
[BlackElo "2550"]
[Annotator "TA"]
[PlyCount "73"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,73,0,11,-10,-5,-16,0,2,4,0,0,0,0,-76,-63,-145,-42,-84,-58,-41,-51,-62,-15,-20,0,0,0,0,0,0,0,-186,-34,-30,-27,-34,0,0,0,0,0,0,0,0,108,83,111,114,102,8,1,10,62,78,335,329,312,325,309,291,483,509,443,481,598,383]} 1. e4 c5 2. Nc3 d6 3. d4 cxd4 4. Qxd4 Nc6 5. Qd2 Nf6 6. b3 {B23: Closed Sicilian: Lines without g3.} e6 7. Bb2 d5 8. exd5 {The position is equal.} exd5 9. O-O-O {[%cal Rc3d5]} Be6 10. Nf3 Qa5 11. Kb1 (11. Bb5 $11) 11... Bb4 $17 {[#]} 12. Qd3 $146 {[#]} ({Predecessor:} 12. Nd4 Ne4 13. Nxe4 Bxd2 14. Nd6+ Kf8 15. Nxb7 Qb6 16. Nxc6 Qxc6 17. Ba3+ Kg8 18. Nc5 {0-1 (39) Kairbekova,A (2065)-Nurmanova,A (2026) Almaty 2020}) 12... O-O (12... Ng4 $1 $17 13. Qd2 (13. Nxd5 $2 O-O-O $19) 13... O-O) 13. Nd4 Rac8 {Hoping for ...Nxd4.} 14. Nxc6 Rxc6 15. Nb5 Rfc8 16. a3 Be7 ({Don't play} 16... Rxc2 $6 17. axb4 Qxb4 18. Nd4 $16 (18. Nxa7 $2 Bf5 $19)) 17. b4 Qa4 {...Ne4 is the strong threat.} 18. Qb3 $1 {[%cal Rb3a4]} Qxb3 19. cxb3 Ne4 20. Bd4 {[#]} (20. Nxa7 $11 {and White stays safe.} Nxf2 {[%mdl 64] Double Attack} 21. Nxc6 Rxc6 22. Bb5) 20... Bf6 $2 (20... Rc2 $1 $19 21. Bc4 Rxf2) 21. Bd3 $1 $15 {[%cal Rd3e4] Black must now prevent Bxe4.} Bxd4 22. Bxe4 Bxf2 (22... Bf6 {with more complications.} 23. Bd3 Rd8 24. Rc1 g6 25. Nxa7 Rxc1+ 26. Rxc1 Bd4) 23. Bxd5 Bxd5 24. Rxd5 g6 25. Rf1 Bb6 26. Rd7 a6 (26... Be3 $11) 27. Nd6 $16 {[%mdl 64] Double Attack} Rf8 28. Nxf7 {Threatening mate with Nh6+.} Be3 29. Rf3 (29. Rxb7 $16 Rc3 30. Rd7) 29... Rc1+ $11 30. Kb2 Rfc8 31. Rd8+ $14 Kg7 $2 {[%mdl 8192] A mistake that costs the game.} (31... Rxd8 $16 {was called for.} 32. Nxd8 Re1) 32. Rxc8 $18 Rxc8 33. Rxe3 Kxf7 34. Rc3 Re8 (34... Rb8 {was necessary.} 35. Rc7+ Ke6 36. Rxh7 b5) 35. Rc7+ {White is clearly winning.} Kf6 36. Rxb7 h5 37. Rc7 {Weighted Error Value: White=0.18/Black=0.52} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "16.10"]
[White "Yoo, Christopher Woojin"]
[Black "Shuvalova, Polina"]
[Result "1-0"]
[ECO "D30"]
[WhiteElo "2455"]
[BlackElo "2476"]
[Annotator "TA"]
[PlyCount "65"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,64,0,0,-18,0,0,2,0,0,0,0,-27,-19,-18,-20,-12,-14,-30,46,18,44,-7,25,7,57,63,108,108,97,62,69,62,72,68,62,46,431,200,453,205,216,200,208,207,178,158,948,957,29981,29982,29982,29983,29983,29984,29981,29961,29999]} 1. d4 Nf6 2. Nf3 e6 3. c4 d5 4. Bg5 dxc4 5. Qa4+ Nbd7 6. Nc3 {D30: Queen's Gambit Declined: Systems without Nc3.} Be7 7. e4 O-O 8. Qxc4 {The position is equal.} h6 9. Bf4 c5 {[#]} 10. dxc5 $146 ({Predecessor:} 10. O-O-O cxd4 11. Bc7 Qe8 12. Nxd4 Nb6 13. Bxb6 axb6 14. e5 Nd5 15. Nxd5 exd5 16. Qxd5 {½-½ (78) Lalith,B (2541)-Teske,H (2512) Chennai 2013}) 10... Bxc5 11. Be2 a6 12. e5 {[#]} b5 $1 13. Qd3 {[#]} Nh7 (13... b4 $1 $11 14. exf6 Qxf6 {[%mdl 64] Double Attack}) 14. O-O Bb7 15. Rfd1 (15. Ne4 $14) 15... Nb6 16. Qc2 Qe7 17. Bd3 Ng5 18. Bxg5 hxg5 19. Be4 g4 20. Bxb7 Qxb7 21. Ng5 {[%csl Gg5][%cal Rc2h7]} g6 22. Qe2 {Nce4 is the strong threat.} Nc4 $2 {[%mdl 8192]} ({Better is} 22... Qb8 $14) 23. Qxg4 (23. Nce4 $142 Bb4 {[#]} 24. Rd7 $3 {[%mdl 512]}) 23... Kg7 $2 (23... Be7 {might work better.} 24. Nxe6 Qc8 {[%mdl 64] Pin}) 24. Nce4 $40 {[%mdl 128] Black is in trouble.} (24. Qh4 $142 {[%csl Gg5][%cal Rh4h7]} Rh8 25. Qf4 Nxb2 26. Nce4) 24... Be7 $18 25. Qh4 {[%csl Gg5][%cal Rh4h7]} Rh8 26. Qf4 Bxg5 27. Nxg5 {Hoping for Qf6+.} Rh5 $2 {Loses the game.} (27... Qe7 $16 28. b3 Nb6) 28. Qf6+ Kg8 29. Rd8+ {White mates.} Rxd8 30. Qxd8+ Kg7 31. Qf6+ Kh6 32. Nxf7+ Kh7 33. Qh8# {Weighted Error Value: White=0.32/Black=0.75} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "17.1"]
[White "Shuvalova, Polina"]
[Black "Zhu, Jiner"]
[Result "0-1"]
[ECO "A18"]
[WhiteElo "2476"]
[BlackElo "2459"]
[Annotator "TA"]
[PlyCount "126"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,125,28,18,27,18,26,6,10,31,9,0,37,29,26,30,30,16,8,-31,-25,-65,-16,-113,-99,-101,-121,-122,-111,-117,-134,-124,-81,-77,0,0,0,0,0,0,0,0,0,0,0,-91,0,0,0,0,0,0,0,0,0,0,0,0,0,-1016,-967,-958,-911,-755,-727,-930,-918,-1630,-820,-1952,-1321,-9244,-5493,-29967,-2014,-29978,-29974,-29974,-29975,-29975,-29975,-29984,-29985,-29985,-29986,-29986,-29987,-29987,-29988,-29988,-29989,-29989,-29990,-29990,-29989,-29989,-29990,-29992,-29993,-29993,-29993,-29995,-29993,-29993,-29993,-29993,0,-29993,-29993,-29993,-29994,-29996,-29997,-29997,-29998,-29998,-29999,-29999]} 1. c4 Nf6 2. Nc3 e6 3. e4 d5 4. cxd5 exd5 5. e5 Ne4 6. Nf3 Bf5 {A18: English Opening: Flohr-Mikenas System (1 c4 Nf6 2 Nc3 e6 3 e4).} 7. Be2 c5 8. d4 Nc6 {The position is equal.} 9. O-O c4 10. Nxe4 {[#]} dxe4 $146 ({Predecessor:} 10... Bxe4 11. Nd2 Bf5 12. g4 Be6 13. b3 h5 14. Nf3 cxb3 15. Qxb3 hxg4 16. Qxb7 gxf3 {½-½ (52) Liu,Z (2386)-Svetushkin,D (2528) Paracin 2019}) 11. Ng5 h6 {[#]} 12. Nxf7 Kxf7 13. Bxc4+ Kg6 14. Be3 (14. g4 {looks sharper.} Bc8 15. Be3 Na5 16. Be2 Be6 17. Qc2) 14... Kh7 $1 15. a3 Be7 16. b4 (16. f4 $1 $11) 16... a6 17. Rc1 Rf8 18. Qd2 Bg5 19. Qb2 Bxe3 20. fxe3 Qe7 21. Bd5 Rac8 (21... Qd7 $17 22. Qa2 Ne7) 22. Rxf5 $11 {[%mdl 64] Remove Defender} Rxf5 23. Bxe4 Qg5 24. Bxf5+ Qxf5 25. d5 Ne7 26. Rxc8 Nxc8 27. Qd4 (27. h3 $11 {keeps the balance.}) 27... Ne7 (27... Qb1+ $17 28. Kf2 Ne7) 28. h3 Qb1+ 29. Kh2 Qf5 30. a4 {White wants to play b5.} Kg8 31. b5 axb5 32. axb5 {d6 is the strong threat.} Ng6 33. e6 {Black must now prevent d6.} Qe5+ 34. Qxe5 $4 {[%mdl 8192] White is on the road to losing.} (34. g3 $11) 34... Nxe5 {[%mdl 4096] Endgame KN-KP} 35. Kg3 Kf8 36. Kf4 {[#]} Nc4 $1 37. e4 Ke7 38. e5 {[#]} Na3 $1 {[%cal Ra3b5]} 39. Kf5 Nxb5 40. h4 h5 41. g3 b6 (41... Nd4+ $142 42. Ke4 Ne2 43. Kf3 Nc3 44. d6+ Kxe6 45. Ke3 Na4 46. Kf3 Nc5 47. g4 hxg4+ 48. Kxg4 Kxe5 49. Kf3 Kd4 50. Ke2 Kc3 51. h5 b5 52. Ke3 b4 53. h6 gxh6 54. d7 Nxd7 55. Ke4 b3 56. Kd5 b2 57. Ke6 Nc5+ 58. Kd6 Kd4 59. Ke7 b1=Q 60. Kf6 Nd7+ 61. Ke7 Qh7+ 62. Kd8 Ne5 63. Ke8 Qf7+ 64. Kd8 Qd7#) 42. g4 hxg4 43. Kxg4 Nc3 44. d6+ Kxe6 {KN-K3P} 45. Kg5 b5 46. Kg6 b4 47. Kxg7 b3 48. d7 Kxd7 {KN-KPP} 49. h5 b2 50. h6 b1=Q 51. h7 Qg1+ 52. Kf7 Qh2 53. Kg8 Qg3+ 54. Kf7 Qf4+ 55. Kg8 Qg5+ 56. Kf7 Qf5+ 57. Kg7 Qg5+ 58. Kf7 $1 Qh6 {Black mates.} 59. e6+ Kd6 60. Kg8 Qg6+ 61. Kh8 Nd5 62. e7 Qf6+ {[%mdl 64] Double Attack} 63. Kg8 Nxe7# {Weighted Error Value: White=0.64/Black=0.22} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "17.2"]
[White "Bjerre, Jonas Buhl"]
[Black "Yoo, Christopher Woojin"]
[Result "1-0"]
[ECO "A50"]
[WhiteElo "2550"]
[BlackElo "2455"]
[Annotator "ChessBase"]
[PlyCount "97"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} b6 {[%emt 0:00:01]} 3. Nf3 {[%emt 0:00:12]} Bb7 {[%emt 0:00:04]} 4. g3 {[%emt 0:00:01]} g6 {[%emt 0:00:26]} 5. Bg2 {[%emt 0:00:15]} Bg7 {[%emt 0:00:03]} 6. O-O {[%emt 0:00:08]} O-O {[%emt 0:00:01]} 7. Nc3 {[%emt 0:00:51]} Ne4 {[%emt 0:00:04]} 8. Nxe4 {[%emt 0:00:22]} Bxe4 {[%emt 0:00:09]} 9. Bf4 {[%emt 0:00:09]} d6 {[%emt 0:00:56]} 10. Qd2 {[%emt 0:00:13]} e6 {[%emt 0:00:03]} 11. Bg5 {[%emt 0:00:36]} Qe8 {[%emt 0:02:10]} 12. Bh6 {[%emt 0:00:14]} Nd7 {[%emt 0:00:16]} 13. Qe3 {[%emt 0:00:38]} Bb7 {[%emt 0:00:14]} 14. Rfd1 {[%emt 0:00:39]} Nf6 {[%emt 0:00:43]} 15. Bxg7 {[%emt 0:00:03]} Kxg7 {[%emt 0:00:02]} 16. c5 {[%emt 0:00:24]} Qb5 {[%emt 0:00:48]} 17. a4 {[%emt 0:01:07]} Qb4 {[%emt 0:00:23]} 18. Rdc1 {[%emt 0:01:03]} Bd5 {[%emt 0:01:26]} 19. Nd2 {[%emt 0:00:42]} Bxg2 {[%emt 0:00:13]} 20. Kxg2 {[%emt 0:00:15]} Nd5 {[%emt 0:00:57]} 21. Qd3 {[%emt 0:00:03]} dxc5 {[%emt 0:00:16]} 22. Rc4 {[%emt 0:00:48]} Qxb2 {[%emt 0:00:12]} 23. Rb1 {[%emt 0:00:10]} Qa2 {[%emt 0:00:03]} 24. e4 {[%emt 0:00:26]} Nf6 {[%emt 0:00:27]} 25. d5 {[%emt 0:01:06]} exd5 {[%emt 0:00:29]} 26. exd5 {[%emt 0:00:02]} Rad8 {[%emt 0:00:12]} 27. Qc3 {[%emt 0:00:13]} Rxd5 {[%emt 0:00:10]} 28. Rb2 {[%emt 0:00:33]} Qa1 {[%emt 0:00:43]} 29. Ne4 {[%emt 0:00:01]} Rd1 {[%emt 0:00:19]} 30. Nxf6 {[%emt 0:00:34]} Rg1+ {[%emt 0:00:04]} 31. Kh3 {[%emt 0:00:04]} Kh8 {[%emt 0:00:35]} 32. Nd7+ {[%emt 0:00:11]} Kg8 {[%emt 0:00:01]} 33. Nf6+ {[%emt 0:00:11]} Kh8 {[%emt 0:00:02]} 34. Nxh7+ {[%emt 0:00:03]} f6 {[%emt 0:00:04]} 35. Nxf8 {[%emt 0:00:06]} Qf1+ {[%emt 0:00:06]} 36. Kh4 {[%emt 0:00:06]} g5+ {[%emt 0:00:12]} 37. Kh5 {[%emt 0:00:16]} Kg7 {[%emt 0:00:05]} 38. Ne6+ {[%emt 0:00:07]} Kf7 {[%emt 0:00:04]} 39. Nxg5+ {[%emt 0:00:06]} Kg7 {[%emt 0:00:04]} 40. Ne6+ {[%emt 0:00:06]} Kf7 {[%emt 0:00:01]} 41. Nf4 {[%emt 0:00:12]} Qd1+ {[%emt 0:00:05]} 42. f3 {[%emt 0:00:03]} Qd8 {[%emt 0:00:06]} 43. Kg4 {[%emt 0:00:06]} Qd7+ {[%emt 0:00:03]} 44. Kh4 {[%emt 0:00:03]} Qf5 {[%emt 0:00:01]} 45. g4 {[%emt 0:00:06]} Qg5+ {[%emt 0:00:10]} 46. Kh3 {[%emt 0:00:01]} f5 {[%emt 0:00:09]} 47. Nh5 {[%emt 0:00:03]} fxg4+ {[%emt 0:00:08]} 48. fxg4 {[%emt 0:00:01]} Rf1 {[%emt 0:00:07]} 49. Qg3 {[%emt 0:00:05]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "17.3"]
[White "Gukesh D"]
[Black "Liang, Awonder"]
[Result "1-0"]
[ECO "E99"]
[WhiteElo "2578"]
[BlackElo "2592"]
[Annotator "ChessBase"]
[PlyCount "119"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:01]} g6 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:01]} Bg7 {[%emt 0:00:00]} 4. e4 {[%emt 0:00:02]} d6 {[%emt 0:00:00]} 5. Nf3 {[%emt 0:00:08]} O-O {[%emt 0:00:01]} 6. Be2 {[%emt 0:00:02]} e5 {[%emt 0:00:01]} 7. O-O {[%emt 0:00:10]} Nc6 {[%emt 0:00:02]} 8. d5 {[%emt 0:00:02]} Ne7 {[%emt 0:00:01]} 9. Ne1 {[%emt 0:00:01]} Nd7 {[%emt 0:00:11]} 10. Nd3 {[%emt 0:00:02]} f5 {[%emt 0:00:04]} 11. f3 {[%emt 0:00:02]} f4 {[%emt 0:00:04]} 12. b4 {[%emt 0:00:01]} g5 {[%emt 0:00:28]} 13. c5 {[%emt 0:00:06]} Ng6 {[%emt 0:00:02]} 14. a4 {[%emt 0:00:34]} Rf7 {[%emt 0:00:05]} 15. a5 {[%emt 0:00:42]} Bf8 {[%emt 0:00:19]} 16. c6 {[%emt 0:00:37]} Nf6 {[%emt 0:00:30]} 17. b5 {[%emt 0:00:51]} h5 {[%emt 0:00:29]} 18. Nf2 {[%emt 0:00:23]} Rg7 {[%emt 0:00:26]} 19. Kh1 {[%emt 0:00:24]} Rb8 {[%emt 0:01:11]} 20. Rg1 {[%emt 0:02:43]} Nh8 {[%emt 0:00:45]} 21. g3 {[%emt 0:00:18]} Ng6 {[%emt 0:00:57]} 22. gxf4 {[%emt 0:00:54]} Nxf4 {[%emt 0:00:04]} 23. Bxf4 {[%emt 0:00:03]} exf4 {[%emt 0:00:11]} 24. Rg2 {[%emt 0:00:31]} bxc6 {[%emt 0:00:21]} 25. dxc6 {[%emt 0:00:07]} Qe7 {[%emt 0:00:59]} 26. Qd4 {[%emt 0:00:45]} Qe5 {[%emt 0:00:01]} 27. Qxa7 {[%emt 0:00:43]} Qxc3 {[%emt 0:00:02]} 28. Rag1 {[%emt 0:00:02]} Rxb5 {[%emt 0:00:03]} 29. Bxb5 {[%emt 0:00:03]} Qxf3 {[%emt 0:00:01]} 30. Qd4 {[%emt 0:00:42]} Rg6 {[%emt 0:02:23]} 31. Qd3 {[%emt 0:00:16]} Qxd3 {[%emt 0:00:43]} 32. Bxd3 {[%emt 0:00:02]} g4 {[%emt 0:00:05]} 33. e5 {[%emt 0:00:04]} f3 {[%emt 0:00:07]} 34. Bxg6 {[%emt 0:00:33]} fxg2+ {[%emt 0:00:01]} 35. Kxg2 {[%emt 0:00:09]} dxe5 {[%emt 0:00:05]} 36. Rb1 {[%emt 0:00:02]} Nd5 {[%emt 0:00:04]} 37. Rb8 {[%emt 0:00:22]} Ba6 {[%emt 0:00:04]} 38. Be4 {[%emt 0:00:12]} Nf4+ {[%emt 0:00:02]} 39. Kg1 {[%emt 0:00:03]} Kf7 {[%emt 0:00:02]} 40. Ra8 {[%emt 0:00:05]} Bb5 {[%emt 0:00:06]} 41. a6 {[%emt 0:00:10]} Bc5 {[%emt 0:00:04]} 42. a7 {[%emt 0:00:07]} Nh3+ {[%emt 0:00:12]} 43. Kg2 {[%emt 0:00:01]} Nxf2 {[%emt 0:00:47]} 44. Bd5+ {[%emt 0:00:01]} Ke7 {[%emt 0:00:07]} 45. Re8+ {[%emt 0:00:04]} Kxe8 {[%emt 0:00:01]} 46. a8=Q+ {[%emt 0:00:01]} Ke7 {[%emt 0:00:00]} 47. Qg8 {[%emt 0:00:27]} Kf6 {[%emt 0:00:04]} 48. Qf7+ {[%emt 0:00:06]} Kg5 {[%emt 0:00:02]} 49. Qg7+ {[%emt 0:00:02]} Kf5 {[%emt 0:00:05]} 50. Qxc7 {[%emt 0:00:05]} Nd3 {[%emt 0:00:05]} 51. Qf7+ {[%emt 0:00:06]} Kg5 {[%emt 0:00:01]} 52. c7 {[%emt 0:00:08]} Ba6 {[%emt 0:00:05]} 53. Qg8+ {[%emt 0:00:04]} Kf4 {[%emt 0:00:03]} 54. c8=Q {[%emt 0:00:03]} Bxc8 {[%emt 0:00:01]} 55. Qxc8 {[%emt 0:00:01]} e4 {[%emt 0:00:00]} 56. Qe6 {[%emt 0:00:10]} Ne1+ {[%emt 0:00:24]} 57. Kf1 {[%emt 0:00:01]} Nf3 {[%emt 0:00:02]} 58. Qxe4+ {[%emt 0:00:03]} Kg5 {[%emt 0:00:00]} 59. Kg2 {[%emt 0:00:04]} h4 {[%emt 0:00:09]} 60. h3 {[%emt 0:00:03]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "17.5"]
[White "Mendonca, Leon Luke"]
[Black "Salimova, Nurgyul"]
[Result "1-0"]
[ECO "D24"]
[WhiteElo "2549"]
[BlackElo "2397"]
[Annotator "TA"]
[PlyCount "123"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,123,14,58,47,59,50,58,44,44,42,45,40,50,0,4,0,18,7,14,6,11,0,9,0,0,0,0,-18,-26,-24,17,33,25,48,67,27,69,26,64,51,55,22,115,117,104,117,111,85,591,69,58,40,29,0,31,38,52,4,8,0,78,0,0,4,4,-67,0,0,66,4,51,58,91,64,114,9,26,0,126,90,177,181,443,460,416,411,442,450,504,495,645,533,717,662,628,502,485,483,476,420,720,672,616,588,1264,1221,29996,877,905,757,29976,29978,29978,29976,29976,29976]} 1. d4 Nf6 2. c4 e6 3. Nc3 d5 4. Nf3 dxc4 5. e4 b5 6. e5 {D24: Queen's Gambit Accepted: 3 Nf3 Nf6 4 Nc3.} Nd5 7. Nxb5 Nb6 8. Be2 {White is slightly better.} Be7 9. O-O Nc6 10. Be3 {10.Qd2 is more advanced technology.} Bb7 {[#]} 11. b3 $146 ({Predecessor:} 11. Rc1 Nb4 12. Bxc4 Nxc4 13. Rxc4 O-O 14. Qa4 Nd5 15. Rcc1 a5 16. Nc3 Nb6 17. Qc2 {1-0 (31) Sarana,A (2636)-Maghsoodloo,P (2671) chess.com INT 2019}) 11... cxb3 12. axb3 a6 13. Nc3 Nb4 14. Qb1 O-O 15. Rc1 N6d5 16. Ne4 Nxe3 17. fxe3 Nd5 18. Kf2 f6 19. exf6 gxf6 (19... Nxf6 {with more complications.} 20. Nxf6+ Bxf6 21. Qc2 e5 22. Qxc7 Qxc7 23. Rxc7 exd4 24. Rd1 Bd5) 20. Nc5 Bxc5 21. dxc5 Qe8 22. Ra4 Rf7 23. Rh4 Rg7 24. g3 Rd8 25. Qb2 Qf7 (25... e5 $1 $11) 26. Rd1 $16 Re8 27. e4 Ne7 {With the idea ...Ng6.} 28. Rd7 Qg6 $2 {[%mdl 8192]} (28... Qf8 $16) 29. Qd4 $2 (29. Nd4 $18 Bc8 30. c6) 29... Nc6 $14 30. Rxg7+ Qxg7 31. Qe3 Ne7 32. Nd4 Ng6 33. Rh5 Qe7 34. Bc4 {Strongly threatening c6.} Bc8 (34... Ne5 $11 {keeps the balance.} 35. Rh4 (35. Bxe6+ $2 Qxe6 {[%mdl 64] Remove Defender} 36. Nxe6 Ng4+ {[%mdl 64] Double Attack} 37. Ke2 Nxe3 $19) 35... Nxc4 36. bxc4 Qxc5) 35. Qh6 (35. Nf5 $16 Qf8 36. Nh6+ Kh8 37. Ng4) 35... Qg7 36. Qxg7+ (36. Qc1 {is more complex.} Ne5 37. Be2 Rd8 38. Nf3 Nxf3 39. Kxf3 e5 40. Bc4+) 36... Kxg7 37. Nf3 (37. Ke3 $11) 37... Rd8 ({Better is} 37... e5 $1 $15 38. h3 Rd8) 38. e5 $1 $11 {[%cal Re5f6] exf6+ is the strong threat.} fxe5 (38... f5 $11) 39. Nxe5 (39. Ke2 $14) 39... Rd2+ 40. Ke3 Rd1 41. Nf3 Bb7 42. Be2 (42. Bxe6 $16 Bxf3 43. Kxf3) 42... Rb1 43. Bc4 Ne7 (43... Rd1 $1 $11) 44. Nd4 {White stays focused until the end.} Nd5+ (44... Bd5 $16) 45. Kd2 $18 Nb4 $2 (45... Bc8 46. Bd3 (46. Bxd5 exd5 47. Rxd5 Kf6 $16) 46... Rb2+ 47. Kc1 Nf6) 46. Nxe6+ Kf6 47. Nxc7 a5 48. Rxh7 Rb2+ 49. Ke3 Bg2 50. Nb5 Nc2+ 51. Kf4 Nb4 52. Nd6 {Black must now prevent Ne8+.} Rf2+ 53. Kg4 {Threatens to win with Rf7+.} Bf3+ {[#]} 54. Kh3 $1 Kg6 (54... Ke5 $142 55. g4 Bc6) 55. Rf7 Bg2+ 56. Kh4 Bf3 {[%cal Rf2h2]} 57. h3 Nc6 58. Bd5 Ne5 {[#]} 59. Rf4 $1 Kh6 (59... Bxd5 60. Rxf2) 60. Nf7+ {White mates.} Nxf7 61. Rxf7 Bxd5 62. Rxf2 {Weighted Error Value: White=0.41/Black=0.45} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "17.6"]
[White "Abdumalik, Zhansaya"]
[Black "Praggnanandhaa R"]
[Result "0-1"]
[ECO "B63"]
[WhiteElo "2472"]
[BlackElo "2608"]
[Annotator "TA"]
[PlyCount "98"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 25,98,0,0,-65,-64,-58,-55,-78,-38,-53,-43,-70,-47,-47,-33,-62,-38,-103,-81,-71,-48,-56,-51,-37,-41,-86,-32,-26,-11,-46,-47,-52,-55,-58,-56,-110,-102,-133,-127,-130,-100,-115,-114,-93,-100,-80,-51,-301,-290,-236,-238,-229,-220,-218,-70,-277,-277,-329,-310,-297,-312,-437,-431,-415,-375,-717,-709,-693,-687,-1509,-1834,-29976,-29977,-29983,-29984]} 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Bg5 e6 7. Qd2 a6 8. O-O-O Be7 9. f3 Nxd4 10. Qxd4 O-O 11. Kb1 b5 12. h4 Bb7 13. g4 Rc8 14. h5 {[#] B63: Sicilian: Richter-Rauzer: 7...Be7 and unusual Black 7th moves.} (14. Bd3 $11) 14... Nxe4 $1 $15 15. Nxe4 {h6 is the strong threat.} Bxg5 16. Qxd6 {[#] Black is slightly better.} Bf4 $146 ({Predecessor:} 16... Be7 17. Qxd8 Rfxd8 18. Be2 f5 19. gxf5 exf5 20. Ng3 g6 21. hxg6 hxg6 22. Rdg1 Rc5 {0-1 (42) Sarwat,W (2325)-Sameeh,H (2289) Tanta 2003}) 17. Qxd8 Rfxd8 18. Rxd8+ Rxd8 {[%cal Rd8d1]} 19. Bd3 Rc8 20. Rf1 g6 21. a3 ({Better is} 21. hxg6 $15 hxg6 22. Nf6+ Kg7 23. Be4) 21... Kg7 22. b4 Rc7 23. Nc5 Bc8 24. hxg6 hxg6 25. Kb2 Bd6 (25... Be3 $17 26. Nb3 Kf6) 26. Ne4 Be5+ 27. c3 f5 28. Nc5 Bd6 29. Nb3 Kf6 30. Rh1 (30. Rd1 $15) 30... Bb7 $17 31. Rh3 Bd5 32. Nd4 {intending gxf5.} Be5 33. Ne2 fxg4 34. fxg4 {[#]} Kg5 $1 35. Re3 Bf4 36. Rh3 ({White has to play} 36. Nxf4 $15 Kxf4 37. Re1) 36... e5 $19 (36... Kxg4 37. Nxf4 Kxf4 38. Bxg6 $17) 37. Rh8 e4 (37... Kxg4 38. Bxg6 Kf3 39. Bh5+ Ke3 40. Re8 $17) 38. Rd8 Bb7 (38... exd3 39. Rxd5+ Kxg4 40. Rxd3 $17) 39. Bc2 Be5 ({Don't take} 39... Kxg4 40. Re8 $17) (39... Re7 $19 40. a4 bxa4 41. Bxa4 Kxg4) 40. Rg8 $2 (40. Re8 $15 Kf6 41. Bb3) 40... Re7 ({Don't play} 40... Kxg4 41. Rxg6+ Kf3 42. Nd4+ Ke3 43. a4 $17) 41. a4 Bd5 (41... Kxg4 42. axb5 axb5 43. Rxg6+ Kf3 44. Ng1+ Kf2 45. Nh3+ Ke2 46. Rg2+ Kf3 47. Rg6 $17) 42. Rd8 Bc4 43. Nc1 (43. Bd1 {was worth a try.}) 43... Bf4 44. axb5 axb5 45. Nb3 $2 (45. Rd4 e3 46. Bd3 Bxd3 47. Nxd3) 45... e3 46. Nd4 e2 47. Rf8 Bd5 48. Nxe2 Rxe2 49. Rd8 Be4 {Weighted Error Value: White=0.70/Black=0.10} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "17.7"]
[White "Khademalsharieh, Sarasadat"]
[Black "Yip, Carissa"]
[Result "1/2-1/2"]
[ECO "D77"]
[WhiteElo "2494"]
[BlackElo "2430"]
[Annotator "ChessBase"]
[PlyCount "92"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} Bg7 {[%emt 0:00:01]} 3. Nf3 {[%emt 0:00:03]} Nf6 {[%emt 0:00:09]} 4. g3 {[%emt 0:00:02]} d5 {[%emt 0:00:04]} 5. Bg2 {[%emt 0:00:08]} O-O {[%emt 0:00:03]} 6. O-O {[%emt 0:00:02]} dxc4 {[%emt 0:00:02]} 7. Na3 {[%emt 0:00:01]} Nc6 {[%emt 0:00:01]} 8. Nxc4 {[%emt 0:00:06]} Be6 {[%emt 0:00:01]} 9. b3 {[%emt 0:01:01]} Bd5 {[%emt 0:00:03]} 10. Bb2 {[%emt 0:00:12]} a5 {[%emt 0:00:02]} 11. a4 {[%emt 0:00:50]} Qc8 {[%emt 0:00:10]} 12. Rc1 {[%emt 0:00:11]} Rd8 {[%emt 0:00:41]} 13. e3 {[%emt 0:00:32]} Ne4 {[%emt 0:00:48]} 14. Qe2 {[%emt 0:00:14]} Qe6 {[%emt 0:00:30]} 15. Ne1 {[%emt 0:01:36]} Ng5 {[%emt 0:02:12]} 16. h4 {[%emt 0:01:51]} Bxg2 {[%emt 0:00:40]} 17. Nxg2 {[%emt 0:00:22]} Ne4 {[%emt 0:00:15]} 18. Nf4 {[%emt 0:00:32]} Qf5 {[%emt 0:00:02]} 19. Kg2 {[%emt 0:00:37]} e5 {[%emt 0:00:50]} 20. g4 {[%emt 0:01:17]} Qf6 {[%emt 0:00:03]} 21. g5 {[%emt 0:00:46]} Qf5 {[%emt 0:00:17]} 22. dxe5 {[%emt 0:00:01]} Nxe5 {[%emt 0:00:03]} 23. Bxe5 {[%emt 0:00:10]} Bxe5 {[%emt 0:00:04]} 24. Nxe5 {[%emt 0:00:01]} Qxe5 {[%emt 0:00:01]} 25. Rc2 {[%emt 0:00:04]} c6 {[%emt 0:01:13]} 26. Rd1 {[%emt 0:00:31]} Nc3 {[%emt 0:00:11]} 27. Rxd8+ {[%emt 0:00:02]} Rxd8 {[%emt 0:00:00]} 28. Qf3 {[%emt 0:00:04]} Ne4 {[%emt 0:00:03]} 29. Rc4 {[%emt 0:00:13]} Nd2 {[%emt 0:00:05]} 30. Qd1 {[%emt 0:00:02]} Rd6 {[%emt 0:00:19]} 31. Rc1 {[%emt 0:00:26]} Qe4+ {[%emt 0:00:24]} 32. Kg3 {[%emt 0:00:02]} Qf5 {[%emt 0:00:26]} 33. Kg2 {[%emt 0:00:11]} f6 {[%emt 0:00:29]} 34. gxf6 {[%emt 0:00:07]} Qxf6 {[%emt 0:00:07]} 35. Qg4 {[%emt 0:00:01]} Nxb3 {[%emt 0:00:17]} 36. Rc2 {[%emt 0:00:14]} Qf5 {[%emt 0:00:13]} 37. Qe2 {[%emt 0:00:01]} Qe4+ {[%emt 0:00:19]} 38. Kg3 {[%emt 0:00:04]} Qxa4 {[%emt 0:00:21]} 39. Qg4 {[%emt 0:00:05]} Rf6 {[%emt 0:00:26]} 40. Qc8+ {[%emt 0:00:07]} Rf8 {[%emt 0:00:01]} 41. Qe6+ {[%emt 0:00:10]} Rf7 {[%emt 0:00:23]} 42. Rc3 {[%emt 0:00:04]} Nd2 {[%emt 0:00:08]} 43. Qe8+ {[%emt 0:00:12]} Rf8 {[%emt 0:00:09]} 44. Qe6+ {[%emt 0:00:02]} Rf7 {[%emt 0:00:12]} 45. Qe8+ {[%emt 0:00:06]} Rf8 {[%emt 0:00:02]} 46. Qe6+ {[%emt 0:00:02]} Rf7 {[%emt 0:00:03]} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "17.8"]
[White "Abdusattorov, Nodirbek"]
[Black "Lei, Tingjie"]
[Result "0-1"]
[ECO "C54"]
[WhiteElo "2627"]
[BlackElo "2505"]
[Annotator "TA"]
[PlyCount "96"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,96,8,8,0,0,0,0,0,7,13,20,12,6,7,8,13,24,20,24,15,16,12,16,14,13,0,2,0,50,28,19,16,11,21,16,12,12,8,5,21,16,16,19,0,0,0,57,-26,-38,-65,124,137,137,78,88,42,47,55,43,55,116,108,107,0,0,0,0,-518,-450,-450,-450,-558,-552,-549,-542,-1020,-1017,-1014,-1014,-1010,-997,-1008,-986,-985,-935,-813,-768]} 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 d6 6. Bb3 h6 7. Nbd2 {[%cal Bb1d2,Bd2f1,Bf1g3][%mdl 32] C54: Giuoco Piano: 4 c3 Nf6, main lines with 5 d4 and 5 d3.} a5 8. h3 Bd7 9. Nf1 {[#] The position is equal.} Ne7 $146 ({Predecessor:} 9... O-O 10. Ng3 Ne7 11. O-O Ng6 12. d4 Ba7 13. Be3 Re8 14. Re1 Bc6 15. Bc2 exd4 16. Bxd4 {1-0 (35) Perez Gormaz,M (2413)-Cervantes Landeiro,T (2311) chess.com INT 2020}) 10. Ng3 Ng6 11. O-O a4 12. Bc2 O-O 13. d4 Ba7 14. Be3 b5 15. Qd2 Re8 16. Rad1 Qe7 17. Rfe1 Be6 18. b3 axb3 19. axb3 Rad8 20. Ra1 Bb6 21. d5 Bxe3 22. Qxe3 Bd7 23. Ra7 Rc8 24. Bd3 Nf4 25. Bf1 Qf8 26. Rea1 c6 27. Rxd7 {[%mdl 64] Remove Defender} Nxd7 28. dxc6 Rxc6 (28... Nb8 $1 $11) 29. Bxb5 (29. Ra7 $1 $14) 29... Rc7 $11 30. Ra7 {[#]} Rec8 31. Bxd7 $16 Rxc3 32. Qb6 (32. Qd2 $142 Rc2 33. Qa5) 32... Rb8 33. Rb7 Rxb7 34. Qxb7 Qd8 {White must now prevent ...Rc7.} 35. Bc6 Nxh3+ 36. gxh3 Rxf3 37. Kg2 (37. Bd5 $16) 37... Qf6 $11 38. Nf5 Rc3 39. Qe7 $2 {[%mdl 8192]} Qxe7 $19 {Black is clearly winning.} ({Weaker is} 39... Qg6+ 40. Ng3 $14) 40. Nxe7+ Kf8 41. Nd5 Rxc6 {[%mdl 4096] Endgame KR-KN} 42. b4 Rc4 43. Kf3 f5 44. exf5 Rd4 45. Nc7 Rxb4 46. Kg3 Kf7 47. f3 Rf4 48. Nb5 Ke7 {Weighted Error Value: White=0.44/Black=0.13} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "17.9"]
[White "Murzin, Volodar"]
[Black "Badelka, Olga"]
[Result "1-0"]
[ECO "C11"]
[WhiteElo "2478"]
[BlackElo "2433"]
[Annotator "ChessBase"]
[PlyCount "79"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 2. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 3. Nc3 {[%emt 0:00:02]} Nf6 {[%emt 0:00:00]} 4. e5 {[%emt 0:00:01]} Nfd7 {[%emt 0:00:00]} 5. Nce2 {[%emt 0:00:01]} c5 {[%emt 0:00:03]} 6. c3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:04]} 7. f4 {[%emt 0:00:04]} Be7 {[%emt 0:00:03]} 8. Nf3 {[%emt 0:00:01]} O-O {[%emt 0:00:03]} 9. g3 {[%emt 0:00:04]} b5 {[%emt 0:00:04]} 10. a3 {[%emt 0:00:03]} a5 {[%emt 0:00:02]} 11. Bg2 {[%emt 0:01:13]} b4 {[%emt 0:00:11]} 12. axb4 {[%emt 0:00:08]} cxb4 {[%emt 0:00:02]} 13. O-O {[%emt 0:00:06]} Nb6 {[%emt 0:01:01]} 14. g4 {[%emt 0:00:39]} bxc3 {[%emt 0:00:20]} 15. bxc3 {[%emt 0:00:03]} Nc4 {[%emt 0:00:25]} 16. Ng3 {[%emt 0:00:43]} f6 {[%emt 0:00:59]} 17. Kh1 {[%emt 0:00:08]} fxe5 {[%emt 0:00:41]} 18. dxe5 {[%emt 0:00:15]} Kh8 {[%emt 0:01:25]} 19. Nd4 {[%emt 0:00:15]} Nxd4 {[%emt 0:01:02]} 20. cxd4 {[%emt 0:00:03]} Bh4 {[%emt 0:00:21]} 21. Ne2 {[%emt 0:00:29]} Be7 {[%emt 0:00:15]} 22. Bh3 {[%emt 0:03:01]} Bd7 {[%emt 0:01:36]} 23. f5 {[%emt 0:00:18]} Bg5 {[%emt 0:00:18]} 24. Qd3 {[%emt 0:00:37]} Bxc1 {[%emt 0:00:41]} 25. Raxc1 {[%emt 0:00:03]} Qg5 {[%emt 0:00:15]} 26. Ng3 {[%emt 0:01:10]} a4 {[%emt 0:00:19]} 27. Ra1 {[%emt 0:01:55]} a3 {[%emt 0:00:02]} 28. Rfe1 {[%emt 0:00:37]} Qh4 {[%emt 0:01:11]} 29. Kg2 {[%emt 0:00:09]} Rab8 {[%emt 0:00:03]} 30. Re2 {[%emt 0:00:04]} Rb2 {[%emt 0:00:22]} 31. Ra2 {[%emt 0:00:12]} Qg5 {[%emt 0:00:08]} 32. Kh1 {[%emt 0:00:07]} Qc1+ {[%emt 0:00:03]} 33. Kg2 {[%emt 0:00:00]} Ne3+ {[%emt 0:00:22]} 34. Kf3 {[%emt 0:00:04]} Nd1 {[%emt 0:00:10]} 35. Qxa3 {[%emt 0:00:05]} Rfb8 {[%emt 0:00:16]} 36. Raxb2 {[%emt 0:00:04]} Nxb2 {[%emt 0:00:01]} 37. f6 {[%emt 0:00:05]} gxf6 {[%emt 0:00:03]} 38. exf6 {[%emt 0:00:01]} Qb1 {[%emt 0:00:12]} 39. Qe7 {[%emt 0:00:10]} Nc4 {[%emt 0:00:04]} 40. Qg7# {[%emt 0:00:02]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "17.10"]
[White "Mammadzada, Gunay"]
[Black "Nihal Sarin"]
[Result "0-1"]
[ECO "C70"]
[WhiteElo "2443"]
[BlackElo "2620"]
[Annotator "TA"]
[PlyCount "116"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,116,41,3,0,0,0,0,0,-14,0,-36,18,25,34,30,35,0,27,17,26,0,3,0,0,0,0,0,12,-10,0,-18,-14,-18,-21,-24,-25,-21,-21,-36,-26,-31,-29,-25,-17,-18,-20,-15,-18,-33,-28,-37,-37,-32,-23,-88,-94,-85,-80,-91,-79,-349,-347,-327,-318,-485,-492,-492,-477,-460,-414,-563,-555,-377,-312,-181,-35,-403,-404,-399,-388,-350,-324,-406,-393,-5364,-5269,-5089,-4718,-1780,-408,-403,-393,-378,0,0,0,0,0,0,0,-5076,-5052,-4133,-4133,-29984,-29985,-29988,-29989]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Bc5 5. O-O d6 6. h3 Nge7 {C70: Ruy Lopez: 3...a6 4 Ba4, Norwegian and Delayed Schliemann.} 7. c3 O-O 8. d4 Ba7 {[#] The position is equal.} 9. Bg5 $146 ({Predecessor:} 9. Re1 b5 10. Bb3 Ng6 11. a4 bxa4 12. Rxa4 Rb8 13. Bc4 Nh4 14. d5 Nxf3+ 15. Qxf3 {1-0 (56) Pineiro,D (2198)-Lallana Yanez,D (2003) Montevideo 2011}) 9... f6 10. Be3 Kh8 ({Black should play} 10... f5 $1 $15) 11. Nbd2 $11 Bd7 12. Re1 Be8 13. d5 Nb8 14. Bxe8 {Threatens to win with Bxa7.} Qxe8 15. Qb3 Bxe3 16. Rxe3 Ra7 17. c4 Nd7 18. Qc3 h6 19. Re2 Ra8 20. Rc1 a5 21. b3 f5 22. exf5 Nxf5 23. Ne4 b6 24. a3 Qg6 25. Kh2 Nf6 26. Ng3 Nxg3 27. fxg3 Kg8 28. Qe3 Rf7 29. g4 Raf8 30. b4 axb4 31. axb4 b5 32. Nh4 (32. cxb5 $11 {keeps the balance.} Nxd5 33. Qb3) 32... Nxg4+ $17 33. hxg4 Qxg4 {[%mdl 64] Double Attack} 34. g3 g5 $36 {[%mdl 2048] Black has strong initiative.} ({Reject} 34... bxc4 $6 35. Rec2 $11) 35. Ng2 {[%mdl 8192] [#]} (35. Qe4 $17 {was forced.} Qxe4 36. Rxe4 gxh4 37. Rxh4) 35... Rf1 $1 $19 (35... bxc4 36. Qe4 $16) 36. Rxf1 Rxf1 37. Rf2 (37. Re1 {keeps fighting.} Qh5+ 38. Nh4 Rxe1 39. Qxe1) 37... Qh5+ 38. Nh4 Rxf2+ 39. Qxf2 gxh4 40. cxb5 hxg3+ 41. Kxg3 {[%mdl 4096] Endgame KQ-KQ} Qg5+ 42. Kh3 Kg7 ({Black should try} 42... e4 $19 43. Qc2 Qh5+ 44. Kg3 Qg5+ 45. Kh3 Qf5+ 46. Kh2 Qh5+ 47. Kg3 Qe5+ 48. Kg2 Qe7) 43. Qa7 $2 {[%mdl 8192]} (43. b6 $1 $15 cxb6 44. Qxb6) 43... Qf5+ 44. Kh2 Qf4+ 45. Kh3 Qf7 ({Worse is} 45... Qxb4 46. Qxc7+ Kg6 47. b6 $11) 46. Qb7 e4 47. Qc6 $2 (47. Qa7) 47... Kg6 48. b6 Qf3+ 49. Kh2 Qf2+ (49... Qf4+ $142 50. Kg2 cxb6 51. Qxb6 e3) 50. Kh3 {Threatening Qe8+.} Qe3+ 51. Kg2 {[#]} Qxb6 $2 (51... Qg5+ $1 $19 52. Kh1 Qh5+ 53. Kg1 Qg4+ 54. Kh1 Qf3+ 55. Kg1 Qg3+ 56. Kf1 Qf4+ 57. Ke2 cxb6 58. Qxb6 Kf5) 52. Qe8+ $11 Kf5 53. Qe6+ $1 Kf4 54. Qf6+ $1 Ke3 55. Qxh6+ $2 {[%mdl 8192]} (55. Qc3+ $11 Kf4 56. Qf6+ Kg4 57. Qg6+ Kf4 58. Qf6+) 55... Kd3 56. Qh7 Qxb4 57. Qxc7 e3 58. Qh7+ Qe4+ {Weighted Error Value: White=0.79/Black=0.39} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "18.1"]
[White "Zhu, Jiner"]
[Black "Nihal Sarin"]
[Result "0-1"]
[ECO "C70"]
[WhiteElo "2459"]
[BlackElo "2620"]
[Annotator "TA"]
[PlyCount "66"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,66,42,42,38,11,18,0,0,-8,0,-23,14,-43,9,-26,18,9,10,5,7,-17,0,-56,0,0,34,-38,-12,-13,-27,-41,-50,-47,-35,-32,-39,-59,-56,-53,-24,-83,-102,-149,-139,-175,-171,-165,-171,-217,-218,-324,-148,-124,-153,-181,-163,-623,-615]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Bc5 5. O-O d6 6. c3 Ba7 {C70: Ruy Lopez: 3...a6 4 Ba4, Norwegian and Delayed Schliemann.} 7. h3 Nge7 8. d4 O-O {[#] The position is equal.} 9. Bg5 $146 ({Predecessor:} 9. Re1 b5 10. Bb3 Ng6 11. a4 bxa4 12. Rxa4 Rb8 13. Bc4 Nh4 14. d5 Nxf3+ 15. Qxf3 {1-0 (56) Pineiro,D (2198)-Lallana Yanez,D (2003) Montevideo 2011}) 9... f6 10. Be3 Kh8 11. Bb3 (11. Re1 $11) 11... Bd7 (11... f5 $1 $15) 12. Re1 Be8 13. Nbd2 Bh5 14. g4 Bg6 15. Be6 d5 16. exd5 ({White should try} 16. dxe5 $1 $11 dxe4 17. Nh4) 16... Nxd5 (16... exd4 $1 $15 17. Bxd4 Nxd4 18. cxd4 Nxd5 19. Bxd5 Qxd5) 17. Bxd5 $14 Qxd5 18. c4 (18. dxe5 $14 Bxe3 19. Rxe3) 18... Qd7 {[%cal Re5d4]} 19. d5 Ne7 20. Bxa7 Rxa7 21. Nh4 Raa8 22. Qe2 c6 23. dxc6 Qxc6 24. Rad1 Rad8 {White must now prevent ...Bd3.} 25. Nxg6+ (25. Nf1 $11 {remains equal.}) 25... Nxg6 $17 26. Qe4 Qb6 27. Nb3 Nf4 28. c5 Qb5 ({Worse is} 28... Nxh3+ 29. Kh2 $18 (29. Kg2 Qc6 $11)) 29. Kh2 a5 30. Rd6 (30. Qe3 {was worth a try.}) 30... Rxd6 (30... a4 $19 31. Rb6 Qd3 32. Qxd3 Nxd3) 31. cxd6 Qb6 32. Qe3 Qxd6 33. Nxa5 $2 {[#]} (33. Qc5 Qxc5 34. Nxc5) 33... Qd5 $1 {[%csl Gf4,LRa2,LRa5][%cal Rd5g2][%mdl 64] Double Attack.  Weighted Error Value: White=0.47/Black=0.21} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "18.2"]
[White "Badelka, Olga"]
[Black "Mammadzada, Gunay"]
[Result "0-1"]
[ECO "A07"]
[WhiteElo "2433"]
[BlackElo "2443"]
[Annotator "NA"]
[PlyCount "156"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. g3 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 3. Bg2 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 4. O-O {[%emt 0:00:00]} Bg4 {[%emt 0:00:00]} 5. h3 {[%emt 0:00:02]} Bh5 {[%emt 0:00:02]} 6. d4 {[%emt 0:00:01]} e6 {[%emt 0:00:31]} 7. c4 {[%emt 0:00:02]} Nbd7 {[%emt 0:00:19]} 8. cxd5 {[%emt 0:00:05]} exd5 {[%emt 0:00:04]} 9. Nh4 {[%emt 0:00:01]} Bg6 {[%emt 0:00:03]} 10. Nc3 {[%emt 0:00:01]} Bd6 {[%emt 0:00:19]} 11. Nxg6 {[%emt 0:00:14]} hxg6 {[%emt 0:00:02]} 12. Qd3 {[%emt 0:00:02]} O-O {[%emt 0:00:32]} 13. h4 {[%emt 0:00:21]} Re8 {[%emt 0:00:21]} 14. Bg5 {[%emt 0:00:17]} Qb6 {[%emt 0:00:12]} 15. Bf3 {[%emt 0:01:12]} Be7 {[%emt 0:00:46]} 16. Kg2 {[%emt 0:00:38]} Nf8 {[%emt 0:00:44]} 17. b3 {[%emt 0:00:56]} Ne6 {[%emt 0:00:09]} 18. Bxf6 {[%emt 0:00:20]} Bxf6 {[%emt 0:00:02]} 19. e3 {[%emt 0:00:01]} Rad8 {[%emt 0:01:46]} 20. Rh1 {[%emt 0:00:49]} Nf8 {[%emt 0:00:16]} 21. Rac1 {[%emt 0:00:59]} Qb4 {[%emt 0:00:21]} 22. Ne2 {[%emt 0:00:39]} Qd6 {[%emt 0:00:28]} 23. Rh3 {[%emt 0:00:28]} Ne6 {[%emt 0:00:18]} 24. Rch1 {[%emt 0:00:58]} c5 {[%emt 0:01:00]} 25. h5 {[%emt 0:00:05]} g5 {[%emt 0:00:27]} 26. dxc5 {[%emt 0:02:13]} Nxc5 {[%emt 0:00:05]} 27. Qf5 {[%emt 0:00:03]} Qe6 {[%emt 0:01:45]} 28. Qxe6 {[%emt 0:00:01]} fxe6 {[%emt 0:00:05]} 29. Rd1 {[%emt 0:00:44]} Nd7 {[%emt 0:00:16]} 30. Nd4 {[%emt 0:00:28]} Bxd4 {[%emt 0:00:57]} 31. exd4 {[%emt 0:00:02]} Nf6 {[%emt 0:00:00]} 32. Rhh1 {[%emt 0:00:11]} Rc8 {[%emt 0:00:01]} 33. Rc1 {[%emt 0:00:12]} g4 {[%emt 0:00:02]} 34. Be2 {[%emt 0:00:02]} Kh7 {[%emt 0:00:01]} 35. Bd3+ {[%emt 0:00:10]} Kh6 {[%emt 0:00:04]} 36. Bg6 {[%emt 0:00:04]} Rf8 {[%emt 0:00:21]} 37. Rce1 {[%emt 0:00:07]} Rc6 {[%emt 0:00:14]} 38. Re2 {[%emt 0:00:03]} Ng8 {[%emt 0:00:10]} 39. Rhe1 {[%emt 0:00:04]} Rf6 {[%emt 0:00:02]} 40. Be8 {[%emt 0:00:20]} Rd6 {[%emt 0:00:01]} 41. Rc1 {[%emt 0:00:04]} Rf8 {[%emt 0:00:08]} 42. Bg6 {[%emt 0:00:02]} Ne7 {[%emt 0:00:10]} 43. Rc7 {[%emt 0:00:10]} Nxg6 {[%emt 0:00:16]} 44. hxg6 {[%emt 0:00:00]} Rb6 {[%emt 0:00:01]} 45. Re1 {[%emt 0:00:13]} Kxg6 {[%emt 0:00:07]} 46. Rh1 {[%emt 0:00:02]} Rf7 {[%emt 0:00:10]} 47. Rc8 {[%emt 0:00:09]} Rc6 {[%emt 0:00:02]} 48. Rxc6 {[%emt 0:00:02]} bxc6 {[%emt 0:00:02]} 49. Rc1 {[%emt 0:00:01]} Rc7 {[%emt 0:00:01]} 50. b4 {[%emt 0:00:19]} Rb7 {[%emt 0:00:20]} 51. a3 {[%emt 0:00:02]} Rb6 {[%emt 0:00:02]} 52. Rc5 {[%emt 0:00:04]} Ra6 {[%emt 0:00:04]} 53. Rc3 {[%emt 0:00:06]} Kf5 {[%emt 0:00:09]} 54. Re3 {[%emt 0:00:01]} Ra4 {[%emt 0:00:03]} 55. Rc3 {[%emt 0:00:13]} a5 {[%emt 0:00:02]} 56. bxa5 {[%emt 0:00:02]} Rxd4 {[%emt 0:00:06]} 57. Rxc6 {[%emt 0:00:02]} Ra4 {[%emt 0:00:01]} 58. a6 {[%emt 0:00:02]} Rxa3 {[%emt 0:00:01]} 59. Kf1 {[%emt 0:00:15]} e5 {[%emt 0:00:03]} 60. Ke2 {[%emt 0:00:04]} Ke4 {[%emt 0:00:01]} 61. Rb6 {[%emt 0:00:05]} Ra2+ {[%emt 0:00:02]} 62. Ke1 {[%emt 0:00:03]} d4 {[%emt 0:00:02]} 63. Kf1 {[%emt 0:00:07]} d3 {[%emt 0:00:06]} 64. Ke1 {[%emt 0:00:01]} Kd4 {[%emt 0:00:15]} 65. Rc6 {[%emt 0:00:08]} Re2+ {[%emt 0:00:12]} 66. Kf1 {[%emt 0:00:03]} Rc2 {[%emt 0:00:10]} 67. a7 {[%emt 0:00:08]} Ra2 {[%emt 0:00:05]} 68. Rc7 {[%emt 0:00:02]} g5 {[%emt 0:00:03]} 69. Ke1 {[%emt 0:00:02]} Ke4 {[%emt 0:00:01]} 70. Kd1 {[%emt 0:00:13]} Kf3 {[%emt 0:00:10]} 71. Rf7+ {[%emt 0:00:02]} Kg2 {[%emt 0:00:03]} 72. Ke1 {[%emt 0:00:01]} e4 {[%emt 0:00:03]} 73. Kd1 {[%emt 0:00:02]} Kf1 {[%emt 0:00:05]} 74. Kc1 {[%emt 0:00:13]} Ke1 {[%emt 0:00:02]} 75. Kb1 {[%emt 0:00:01]} Ra4 {[%emt 0:00:14]} 76. Rd7 {[%emt 0:00:09]} d2 {[%emt 0:00:03]} 77. Kc2 {[%emt 0:00:01]} Ra2+ {[%emt 0:00:02]} 78. Kb3 {[%emt 0:00:06]} Rxa7 {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "18.3"]
[White "Lei, Tingjie"]
[Black "Murzin, Volodar"]
[Result "0-1"]
[ECO "D10"]
[WhiteElo "2505"]
[BlackElo "2478"]
[Annotator "ChessBase"]
[PlyCount "88"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 3. cxd5 {[%emt 0:00:00]} cxd5 {[%emt 0:00:00]} 4. Bf4 {[%emt 0:00:00]} Nc6 {[%emt 0:00:07]} 5. Nc3 {[%emt 0:00:02]} e6 {[%emt 0:00:00]} 6. e3 {[%emt 0:00:02]} Bd6 {[%emt 0:00:02]} 7. Bxd6 {[%emt 0:00:01]} Qxd6 {[%emt 0:00:00]} 8. Qg4 {[%emt 0:00:01]} Kf8 {[%emt 0:00:32]} 9. Nf3 {[%emt 0:00:11]} Nge7 {[%emt 0:00:03]} 10. Qg3 {[%emt 0:00:32]} Nf5 {[%emt 0:00:45]} 11. Qxd6+ {[%emt 0:00:04]} Nxd6 {[%emt 0:00:00]} 12. Rc1 {[%emt 0:00:03]} Bd7 {[%emt 0:00:04]} 13. Nb5 {[%emt 0:00:47]} Ke7 {[%emt 0:00:06]} 14. Nxd6 {[%emt 0:00:07]} Kxd6 {[%emt 0:00:01]} 15. Kd2 {[%emt 0:00:28]} f6 {[%emt 0:00:13]} 16. Bb5 {[%emt 0:00:35]} Rhc8 {[%emt 0:00:07]} 17. h4 {[%emt 0:00:58]} Be8 {[%emt 0:00:57]} 18. Bd3 {[%emt 0:00:18]} h6 {[%emt 0:00:52]} 19. g4 {[%emt 0:00:28]} Nb4 {[%emt 0:00:21]} 20. Bb1 {[%emt 0:00:05]} Rxc1 {[%emt 0:00:04]} 21. Rxc1 {[%emt 0:00:03]} Nc6 {[%emt 0:00:05]} 22. Rg1 {[%emt 0:00:45]} Ne7 {[%emt 0:00:11]} 23. g5 {[%emt 0:00:43]} Bh5 {[%emt 0:00:42]} 24. Ne1 {[%emt 0:00:23]} Rg8 {[%emt 0:01:26]} 25. Bh7 {[%emt 0:00:38]} Rf8 {[%emt 0:00:12]} 26. Nd3 {[%emt 0:02:15]} fxg5 {[%emt 0:02:10]} 27. hxg5 {[%emt 0:00:04]} g6 {[%emt 0:01:44]} 28. Nf4 {[%emt 0:00:03]} hxg5 {[%emt 0:00:40]} 29. Rxg5 {[%emt 0:00:12]} Rf7 {[%emt 0:00:02]} 30. Bxg6 {[%emt 0:00:21]} Bxg6 {[%emt 0:00:04]} 31. Nxg6 {[%emt 0:00:02]} Rxf2+ {[%emt 0:00:05]} 32. Kc3 {[%emt 0:00:01]} Nf5 {[%emt 0:00:14]} 33. Rh5 {[%emt 0:01:03]} Nxe3 {[%emt 0:00:26]} 34. Rh7 {[%emt 0:00:10]} Nd1+ {[%emt 0:00:04]} 35. Kd3 {[%emt 0:00:02]} Nxb2+ {[%emt 0:00:03]} 36. Ke3 {[%emt 0:00:01]} Rg2 {[%emt 0:00:18]} 37. Ne5 {[%emt 0:00:23]} Nc4+ {[%emt 0:00:06]} 38. Nxc4+ {[%emt 0:00:01]} dxc4 {[%emt 0:00:01]} 39. Rxb7 {[%emt 0:00:03]} Rxa2 {[%emt 0:00:05]} 40. Rb4 {[%emt 0:00:06]} c3 {[%emt 0:00:13]} 41. Rc4 {[%emt 0:00:29]} Rh2 {[%emt 0:00:06]} 42. Kd3 {[%emt 0:00:45]} c2 {[%emt 0:00:02]} 43. Rc8 {[%emt 0:00:02]} a5 {[%emt 0:00:04]} 44. Rc4 {[%emt 0:00:09]} a4 {[%emt 0:00:05]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "18.4"]
[White "Yip, Carissa"]
[Black "Abdusattorov, Nodirbek"]
[Result "0-1"]
[ECO "B19"]
[WhiteElo "2430"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "70"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 28,70,32,0,7,0,-22,-29,-30,-127,-124,-127,-122,-125,-116,-127,-77,-220,-125,-259,-259,-245,-257,-254,-256,-656,-651,-656,-671,-600,0,0,298,-724,-717,-708,-693,-725,-727,-797,-794,-919,-885,-1160,-1133]} 1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Bf5 5. Ng3 Bg6 6. Nf3 Nd7 7. h4 h6 8. h5 Bh7 9. Bd3 Bxd3 10. Qxd3 e6 11. Bd2 Ngf6 12. O-O-O Be7 13. Kb1 O-O 14. Ne4 c5 15. dxc5 (15. g4 $5) 15... Nxc5 {B19: Classical Caro-Kann: 4...Bf5 main line.} 16. Nxc5 Bxc5 17. Qe2 {aiming for Bxh6!} Qb6 {[#] Black has an edge.} 18. c4 $146 (18. Ne5 $11) ({Predecessor:} 18. Ne5 Rfd8 19. f4 Rac8 20. g4 Bd4 21. c3 Bxe5 22. fxe5 Nd5 23. Qf3 Qc6 24. Rhf1 Rd7 25. g5 Rcd8 26. gxh6 Nxc3+ 27. bxc3 Rxd2 28. Qxf7+ {1-0 (28) Womacka,M (2435)-Rozum,I (2566) chess.com INT 2020}) 18... Ng4 $17 19. Rhf1 Nxf2 20. Rde1 Rad8 $40 {[%mdl 128] Strongly threatening ...Nd3! Black attacks with force.} 21. Bc3 Rfe8 22. g4 (22. Nd2 $17) 22... Rd3 (22... Nxg4 $19 23. Nd2 f5) 23. Bxg7 Kxg7 $19 24. g5 e5 {White must now prevent ...e4.} 25. gxh6+ Qxh6 (25... Kxh6 26. Nxe5 Qf6 27. Qxd3 $11) 26. Rg1+ $2 (26. Nxe5 f6 27. Rxf2 Rxe5 {[%mdl 64] Double Attack} 28. Rg1+ Rg5 29. Rxg5+ Qxg5 30. h6+ Kxh6 31. Rxf6+ (31. Rh2+ $2 Kg7 $19) 31... Qxf6 32. Qxd3) 26... Kf8 27. Nxe5 {[#] Nd7+! would kill now.} Re7 {[%mdl 512]} 28. Qc2 (28. Ka1 Re3) 28... Rd2 (28... Re3 $19 29. Qf5 R7xe5 30. Qc8+ Ke7 31. Qxb7+ Kf6) 29. Qf5 $11 {Intending Qc8+ and mate.} Qb6 $2 {[%mdl 8192]} (29... Rc7 30. Ng6+ (30. Nxf7 $2 Rxb2+ {[%mdl 64] Clearance} 31. Kxb2 Qd2+ 32. Qc2 Nd3+ {[%mdl 64] Double Attack, Discovered Attack} 33. Kb1 Qxc2+ 34. Kxc2 Nxe1+ 35. Rxe1 Kxf7 $19) 30... Qxg6 31. hxg6 Bd4 32. g7+ (32. gxf7 $2 {leads to mate.} Rxb2+ 33. Kc1 Rxc4+ 34. Qc2 Rcxc2#) 32... Bxg7 33. Qh7 Re7 34. Qxg7+ Ke8 35. Rxe7+ Kxe7 36. Qg5+ {[%mdl 64] Double Attack} f6 37. Re1+ Kd7 38. Qxd2+ {[%mdl 64] Double Attack}) (29... Rxb2+ $11 30. Kxb2 Qd2+ 31. Kb3 (31. Kb1 Qb4+ 32. Kc2 Qa4+ {[%mdl 64] Double Attack} 33. Kc3 Qa3+ 34. Kc2 Qxa2+ 35. Kc3 Qa3+ 36. Kc2 Qa2+ 37. Kc3 Bd4+ {[%mdl 64] Decoy} 38. Kxd4 Qd2+ 39. Kc5 Rc7+ 40. Kb5 a6+ 41. Kb6 Qd6+ 42. Nc6 Qxc6+ {[%mdl 64] Double Attack} 43. Ka5 b6+ 44. Kb4 Qxc4+ 45. Ka3 Qc3+ 46. Ka2 Rc5 $19) 31... Qb4+ 32. Kc2 Qa4+ {[%mdl 64] Double Attack} 33. Kc1 (33. Kb1 Qb4+ 34. Kc2 Qa4+ {[%mdl 64] Double Attack} 35. Kc1 Qa3+ 36. Kb1 Qb4+ 37. Kc2 $11) 33... Qa3+ 34. Kb1 Qb4+ 35. Kc2 Qa4+ {[%mdl 64] Double Attack} 36. Kc1 (36. Kb1 Qb4+ 37. Kc2 $11) 36... Qa3+ 37. Kb1 Qb4+ 38. Kc2) 30. Qc8+ $4 {[%mdl 8192]} (30. b3 $18 Ne4 31. Rxe4) 30... Rd8 $19 {Black is clearly winning.} 31. Qf5 {[#]} Nd3 $1 {[%mdl 576] Discovered Attack} 32. Nxd3 (32. Ng6+ Ke8) 32... Bxg1 33. Rxe7 Kxe7 34. h6 Qxh6 35. Qe5+ Kf8 {Weighted Error Value: White=0.95/Black=0.71} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "18.5"]
[White "Praggnanandhaa R"]
[Black "Khademalsharieh, Sarasadat"]
[Result "1-0"]
[ECO "A07"]
[WhiteElo "2608"]
[BlackElo "2494"]
[Annotator "TA"]
[PlyCount "123"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,123,16,29,31,52,44,49,43,50,28,23,28,31,20,54,25,30,12,42,21,18,14,24,12,15,13,23,26,93,35,46,25,29,12,21,0,28,22,31,0,10,10,18,0,0,0,0,0,0,0,0,0,0,0,8,15,106,108,106,114,114,0,0,0,124,124,342,252,260,262,299,268,340,340,340,318,606,622,613,599,555,475,448,429,417,346,469,458,1148,1134,1091,1069,1991,1219,1964,1916,1804,1751,1573,1325,1826,950,1455,1410,1255,1254,1041,952,921,898,1922,1861,1860,1767,1140,884]} 1. Nf3 d5 2. g3 g6 3. Bg2 c6 4. d4 Nd7 5. b3 {[#]} Nh6 $146 ({Predecessor:} 5... Bg7 6. Bb2 Ngf6 7. O-O O-O 8. Nbd2 Qc7 9. Re1 e5 10. dxe5 Ng4 11. h3 Ngxe5 12. Nxe5 Nxe5 {1-0 (22) Manthey,W (1637)-Gehrmann,R (1964) Halberstadt 2015}) 6. O-O {A07: Réti Opening: New York and Capablanca Systems.} Nf5 7. Bb2 Bg7 8. c4 {White is slightly better.} O-O 9. cxd5 cxd5 10. Nc3 Nf6 11. Ne5 Be6 12. Na4 Nd7 13. Qd2 Rc8 14. Rac1 Rxc1 15. Rxc1 Nxe5 16. dxe5 b6 17. e3 Qb8 18. f4 h5 (18... Rd8 $1 $11) 19. Nc3 (19. Rc3 $16) 19... Rd8 $14 20. Nb5 (20. Nxd5 Bxd5 21. Bxd5 e6 $17) 20... Bd7 21. Nd4 (21. Qxd5 $2 Nxe3 22. Qe4 Nxg2 $19) (21. Na3 {keeps more tension.} Qb7 22. Bf1 Bf8 23. Bd3 Ng7 24. Nb5) 21... Nxd4 22. exd4 e6 23. Ba3 Rc8 24. Bf1 Rxc1 25. Qxc1 Bf8 26. Bxf8 Qxf8 27. Qc7 {[%mdl 64] [#] Double Attack} Qb4 28. Qxd7 {Strongly threatening Kg2.} Qxd4+ 29. Kg2 Qe4+ 30. Kf2 Qd4+ 31. Ke2 {Threatens to win with Qc8+.} Qb2+ 32. Kf3 Qc3+ (32... Qxa2 $11 {remains equal.} 33. Qb5 Qxh2) 33. Kg2 $16 {aiming for Qd8+.} Qc2+ 34. Kg1 Qc5+ 35. Kg2 Qc2+ 36. Kg1 Qc5+ $1 37. Kh1 a6 $2 {Black cannot hold the game after this.} (37... Qc2 $16) 38. Qb7 ({And not} 38. Bxa6 Qc1+ 39. Kg2 Qc2+ 40. Kh3 Qf5+ 41. Kg2 Qc2+ 42. Kf3 Qc3+ 43. Kf2 (43. Kg2 Qc2+ $11) 43... Qc5+ 44. Kf3 Qc3+ 45. Kf2 (45. Kg2 Qc2+ $11) 45... Qc5+ 46. Kg2 Qc2+ $11) 38... a5 39. Qa6 Qc1 40. Qd3 Qb2 41. a4 Qc1 42. Kg2 g5 $2 (42... Kg7 43. Be2 Qe1) 43. fxg5 $18 Qxg5 44. Qd4 Qc1 45. Qxb6 Qb2+ 46. Kg1 Qxe5 47. Qc5 Qb2 48. Qe3 {White is clearly winning.} d4 (48... Qg7 $142 49. b4 axb4) 49. Qg5+ {[%mdl 64] [#] Double Attack} Kf8 50. Qxa5 h4 51. Qd8+ Kg7 52. Qg5+ Kf8 53. Qxh4 Qd2 54. Qe4 Qb4 55. Qd3 e5 56. Qb5 Qe1 57. Qe2 Qa5 58. Bg2 Qc5 59. Qc4 Qa3 60. Be4 Qa1+ 61. Kg2 Qe1 62. Qc2 {Weighted Error Value: White=0.17/Black=0.26} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "18.6"]
[White "Salimova, Nurgyul"]
[Black "Abdumalik, Zhansaya"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "2397"]
[BlackElo "2472"]
[Annotator "ChessBase"]
[PlyCount "79"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} g6 {[%emt 0:00:00]} 3. Nbd2 {[%emt 0:00:01]} d5 {[%emt 0:00:00]} 4. e3 {[%emt 0:00:17]} Bg7 {[%emt 0:00:03]} 5. b4 {[%emt 0:00:14]} a5 {[%emt 0:00:22]} 6. b5 {[%emt 0:00:08]} c5 {[%emt 0:00:18]} 7. bxc6 {[%emt 0:00:29]} Nxc6 {[%emt 0:01:10]} 8. Be2 {[%emt 0:01:29]} O-O {[%emt 0:00:24]} 9. O-O {[%emt 0:00:09]} Bf5 {[%emt 0:00:05]} 10. a3 {[%emt 0:01:12]} Rc8 {[%emt 0:00:18]} 11. c4 {[%emt 0:00:48]} Re8 {[%emt 0:01:29]} 12. Bb2 {[%emt 0:00:26]} Qb6 {[%emt 0:00:22]} 13. Ra2 {[%emt 0:00:29]} dxc4 {[%emt 0:00:50]} 14. Bxc4 {[%emt 0:00:40]} h6 {[%emt 0:00:27]} 15. d5 {[%emt 0:01:13]} Nb8 {[%emt 0:00:05]} 16. Bd4 {[%emt 0:00:07]} Qd8 {[%emt 0:01:12]} 17. Qb3 {[%emt 0:00:18]} Ne4 {[%emt 0:00:09]} 18. Bxg7 {[%emt 0:00:26]} Kxg7 {[%emt 0:00:13]} 19. Nd4 {[%emt 0:00:17]} Nc5 {[%emt 0:01:03]} 20. Nxf5+ {[%emt 0:00:04]} gxf5 {[%emt 0:00:01]} 21. Qb2+ {[%emt 0:00:08]} f6 {[%emt 0:00:12]} 22. Nf3 {[%emt 0:00:37]} Rg8 {[%emt 0:00:56]} 23. Nd4 {[%emt 0:00:09]} Qd7 {[%emt 0:00:01]} 24. Qb1 {[%emt 0:00:34]} Ne4 {[%emt 0:00:08]} 25. Rc2 {[%emt 0:00:14]} Na6 {[%emt 0:00:28]} 26. Rfc1 {[%emt 0:00:24]} Nac5 {[%emt 0:00:13]} 27. Bb5 {[%emt 0:00:18]} Qxd5 {[%emt 0:00:21]} 28. f3 {[%emt 0:00:26]} Ng5 {[%emt 0:00:12]} 29. Bc4 {[%emt 0:00:26]} Qe5 {[%emt 0:00:04]} 30. Re2 {[%emt 0:00:04]} Nge6 {[%emt 0:00:28]} 31. f4 {[%emt 0:00:16]} Nxf4 {[%emt 0:00:36]} 32. Nxf5+ {[%emt 0:00:01]} Kh8 {[%emt 0:00:18]} 33. exf4 {[%emt 0:00:03]} Qxf4 {[%emt 0:00:00]} 34. Bxg8 {[%emt 0:00:02]} Rxg8 {[%emt 0:00:09]} 35. Rxc5 {[%emt 0:00:04]} e6 {[%emt 0:00:01]} 36. Qf1 {[%emt 0:00:08]} Qg4 {[%emt 0:00:07]} 37. Nxh6 {[%emt 0:00:07]} Qd4+ {[%emt 0:00:01]} 38. Kh1 {[%emt 0:00:05]} Rg6 {[%emt 0:00:01]} 39. Rc8+ {[%emt 0:00:10]} Kg7 {[%emt 0:00:04]} 40. Rg8+ {[%emt 0:00:03]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "18.8"]
[White "Liang, Awonder"]
[Black "Keymer, Vincent"]
[Result "0-1"]
[ECO "B17"]
[WhiteElo "2592"]
[BlackElo "2591"]
[Annotator "ChessBase"]
[PlyCount "98"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} c6 {[%emt 0:00:00]} 2. Nc3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} dxe4 {[%emt 0:00:00]} 4. Nxe4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 5. Ng3 {[%emt 0:00:01]} g6 {[%emt 0:00:06]} 6. d4 {[%emt 0:00:02]} Bg7 {[%emt 0:00:01]} 7. Bc4 {[%emt 0:01:02]} O-O {[%emt 0:00:05]} 8. O-O {[%emt 0:00:01]} Nbd7 {[%emt 0:00:28]} 9. Re1 {[%emt 0:00:03]} Nb6 {[%emt 0:00:35]} 10. Bb3 {[%emt 0:00:02]} a5 {[%emt 0:00:07]} 11. c3 {[%emt 0:00:30]} a4 {[%emt 0:00:59]} 12. Bc2 {[%emt 0:00:02]} Bg4 {[%emt 0:00:13]} 13. h3 {[%emt 0:00:04]} Bxf3 {[%emt 0:00:14]} 14. Qxf3 {[%emt 0:00:01]} Re8 {[%emt 0:00:06]} 15. Bf4 {[%emt 0:00:25]} Ra5 {[%emt 0:01:30]} 16. Rad1 {[%emt 0:00:13]} Nc4 {[%emt 0:00:26]} 17. b3 {[%emt 0:00:30]} axb3 {[%emt 0:00:04]} 18. axb3 {[%emt 0:00:19]} Nb6 {[%emt 0:00:01]} 19. Ne4 {[%emt 0:01:17]} Nxe4 {[%emt 0:00:11]} 20. Bxe4 {[%emt 0:00:02]} Ra3 {[%emt 0:00:14]} 21. Bc2 {[%emt 0:01:42]} e6 {[%emt 0:00:27]} 22. Be5 {[%emt 0:00:11]} Nd5 {[%emt 0:00:34]} 23. Bxg7 {[%emt 0:00:19]} Kxg7 {[%emt 0:00:04]} 24. c4 {[%emt 0:00:01]} Nf6 {[%emt 0:00:12]} 25. Qc3 {[%emt 0:00:09]} Qa5 {[%emt 0:00:11]} 26. Qg3 {[%emt 0:00:36]} Ra2 {[%emt 0:00:37]} 27. Bb1 {[%emt 0:00:06]} Rd2 {[%emt 0:00:23]} 28. Qe5 {[%emt 0:00:19]} Qc3 {[%emt 0:00:38]} 29. Rxd2 {[%emt 0:00:39]} Qxd2 {[%emt 0:00:00]} 30. Re3 {[%emt 0:00:12]} Qd1+ {[%emt 0:01:03]} 31. Kh2 {[%emt 0:00:02]} Qh5 {[%emt 0:00:03]} 32. Qg3 {[%emt 0:00:30]} Rd8 {[%emt 0:00:16]} 33. Qf4 {[%emt 0:00:19]} Qh6 {[%emt 0:00:13]} 34. Qe5 {[%emt 0:00:23]} Qh5 {[%emt 0:00:26]} 35. Qf4 {[%emt 0:00:05]} Qd1 {[%emt 0:00:14]} 36. Bd3 {[%emt 0:00:05]} Qa1 {[%emt 0:00:05]} 37. d5 {[%emt 0:00:54]} cxd5 {[%emt 0:00:03]} 38. c5 {[%emt 0:00:01]} Qa7 {[%emt 0:00:11]} 39. Qd4 {[%emt 0:00:17]} Qb8+ {[%emt 0:00:07]} 40. f4 {[%emt 0:00:06]} h6 {[%emt 0:01:25]} 41. g4 {[%emt 0:00:12]} g5 {[%emt 0:00:29]} 42. Re5 {[%emt 0:00:02]} Kg8 {[%emt 0:00:11]} 43. Re2 {[%emt 0:00:49]} Qxf4+ {[%emt 0:00:05]} 44. Qxf4 {[%emt 0:00:01]} gxf4 {[%emt 0:00:00]} 45. Ra2 {[%emt 0:00:03]} Nd7 {[%emt 0:00:09]} 46. b4 {[%emt 0:00:02]} b6 {[%emt 0:00:06]} 47. c6 {[%emt 0:00:15]} Ne5 {[%emt 0:00:01]} 48. Bb5 {[%emt 0:00:03]} Rc8 {[%emt 0:00:01]} 49. Rc2 {[%emt 0:00:08]} Nf3+ {[%emt 0:00:03]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "18.9"]
[White "Yoo, Christopher Woojin"]
[Black "Gukesh D"]
[Result "0-1"]
[ECO "D38"]
[WhiteElo "2455"]
[BlackElo "2578"]
[Annotator "ChessBase"]
[PlyCount "114"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:16]} 3. c4 {[%emt 0:00:02]} e6 {[%emt 0:00:03]} 4. Nc3 {[%emt 0:00:02]} Bb4 {[%emt 0:00:42]} 5. Qb3 {[%emt 0:00:30]} c5 {[%emt 0:00:23]} 6. dxc5 {[%emt 0:00:05]} Nc6 {[%emt 0:00:19]} 7. Bg5 {[%emt 0:00:03]} O-O {[%emt 0:01:12]} 8. e3 {[%emt 0:01:00]} h6 {[%emt 0:00:29]} 9. Bxf6 {[%emt 0:00:07]} Qxf6 {[%emt 0:00:01]} 10. cxd5 {[%emt 0:00:18]} exd5 {[%emt 0:00:04]} 11. Bb5 {[%emt 0:00:06]} d4 {[%emt 0:02:02]} 12. Bxc6 {[%emt 0:00:29]} dxc3 {[%emt 0:00:02]} 13. Qxb4 {[%emt 0:00:03]} cxb2 {[%emt 0:00:02]} 14. Rb1 {[%emt 0:00:01]} bxc6 {[%emt 0:00:49]} 15. O-O {[%emt 0:00:19]} Ba6 {[%emt 0:00:29]} 16. Rfe1 {[%emt 0:00:04]} Rab8 {[%emt 0:00:33]} 17. Qa3 {[%emt 0:00:06]} Bc4 {[%emt 0:00:37]} 18. Nd4 {[%emt 0:00:04]} Qg5 {[%emt 0:00:17]} 19. Rxb2 {[%emt 0:00:35]} Rxb2 {[%emt 0:00:02]} 20. Qxb2 {[%emt 0:00:00]} Qxc5 {[%emt 0:00:44]} 21. Qc3 {[%emt 0:00:20]} Rb8 {[%emt 0:00:41]} 22. a3 {[%emt 0:00:15]} f6 {[%emt 0:00:37]} 23. e4 {[%emt 0:01:49]} Re8 {[%emt 0:00:06]} 24. h3 {[%emt 0:00:35]} Kh8 {[%emt 0:01:02]} 25. Nf5 {[%emt 0:00:43]} Rd8 {[%emt 0:00:24]} 26. Ne3 {[%emt 0:00:15]} Rd4 {[%emt 0:00:07]} 27. Rc1 {[%emt 0:00:03]} Qe5 {[%emt 0:00:01]} 28. Nxc4 {[%emt 0:00:07]} Rd1+ {[%emt 0:00:01]} 29. Rxd1 {[%emt 0:00:32]} Qxc3 {[%emt 0:00:01]} 30. Ne3 {[%emt 0:00:06]} Qxa3 {[%emt 0:00:09]} 31. Nf5 {[%emt 0:00:13]} Qa5 {[%emt 0:00:07]} 32. Nd6 {[%emt 0:01:26]} Kg8 {[%emt 0:00:04]} 33. h4 {[%emt 0:00:10]} Qa4 {[%emt 0:00:06]} 34. Rc1 {[%emt 0:00:26]} h5 {[%emt 0:00:07]} 35. g3 {[%emt 0:00:18]} a5 {[%emt 0:00:02]} 36. Kg2 {[%emt 0:00:07]} Qd4 {[%emt 0:00:03]} 37. Rxc6 {[%emt 0:00:03]} a4 {[%emt 0:00:01]} 38. Ra6 {[%emt 0:00:49]} a3 {[%emt 0:00:08]} 39. Rxa3 {[%emt 0:00:37]} Qxd6 {[%emt 0:00:01]} 40. Re3 {[%emt 0:00:04]} Qe5 {[%emt 0:00:05]} 41. Kg1 {[%emt 0:00:09]} Kh7 {[%emt 0:00:02]} 42. Kg2 {[%emt 0:00:02]} Kg6 {[%emt 0:00:02]} 43. Kg1 {[%emt 0:00:01]} Kf7 {[%emt 0:00:06]} 44. Kg2 {[%emt 0:00:01]} Ke6 {[%emt 0:00:02]} 45. Kg1 {[%emt 0:00:10]} Qd4 {[%emt 0:00:02]} 46. Kg2 {[%emt 0:00:02]} Ke5 {[%emt 0:00:05]} 47. Kg1 {[%emt 0:00:04]} Qd1+ {[%emt 0:00:10]} 48. Kg2 {[%emt 0:00:02]} Kd4 {[%emt 0:00:02]} 49. e5 {[%emt 0:00:05]} fxe5 {[%emt 0:00:02]} 50. Rf3 {[%emt 0:00:08]} Qc2 {[%emt 0:00:11]} 51. Rf7 {[%emt 0:00:08]} Qc6+ {[%emt 0:00:02]} 52. Kg1 {[%emt 0:00:08]} g6 {[%emt 0:00:02]} 53. Kh2 {[%emt 0:00:04]} Kd3 {[%emt 0:00:02]} 54. Kg1 {[%emt 0:00:04]} Ke2 {[%emt 0:00:04]} 55. Rf8 {[%emt 0:00:05]} Qc1+ {[%emt 0:00:03]} 56. Kh2 {[%emt 0:00:02]} Qc5 {[%emt 0:00:04]} 57. Kg2 {[%emt 0:00:04]} Qxf8 {[%emt 0:00:03]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "18.10"]
[White "Shuvalova, Polina"]
[Black "Bjerre, Jonas Buhl"]
[Result "0-1"]
[ECO "D38"]
[WhiteElo "2476"]
[BlackElo "2550"]
[Annotator "RC"]
[PlyCount "176"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 4. Nc3 {[%emt 0:00:02]} Bb4 {[%emt 0:00:06]} 5. Qb3 {[%emt 0:00:06]} c5 {[%emt 0:00:27]} 6. dxc5 {[%emt 0:00:09]} Nc6 {[%emt 0:00:23]} 7. Bg5 {[%emt 0:00:19]} Qa5 {[%emt 0:00:22]} 8. Bxf6 {[%emt 0:00:14]} dxc4 {[%emt 0:00:05]} 9. Qxc4 {[%emt 0:00:01]} gxf6 {[%emt 0:00:01]} 10. g3 {[%emt 0:01:23]} Qxc5 {[%emt 0:01:35]} 11. Qxc5 {[%emt 0:00:11]} Bxc5 {[%emt 0:00:02]} 12. Bg2 {[%emt 0:00:01]} Bd7 {[%emt 0:00:31]} 13. O-O {[%emt 0:00:09]} O-O-O {[%emt 0:00:25]} 14. Rac1 {[%emt 0:00:15]} Be7 {[%emt 0:00:17]} 15. Rfd1 {[%emt 0:00:02]} Kb8 {[%emt 0:00:12]} 16. a3 {[%emt 0:00:47]} f5 {[%emt 0:00:38]} 17. e3 {[%emt 0:00:08]} Bc8 {[%emt 0:00:21]} 18. h4 {[%emt 0:00:46]} h6 {[%emt 0:00:24]} 19. Nb5 {[%emt 0:00:58]} a6 {[%emt 0:01:03]} 20. Nbd4 {[%emt 0:00:06]} Nxd4 {[%emt 0:00:06]} 21. exd4 {[%emt 0:00:05]} f4 {[%emt 0:00:50]} 22. gxf4 {[%emt 0:01:53]} Rhg8 {[%emt 0:00:08]} 23. Ne5 {[%emt 0:00:56]} f6 {[%emt 0:00:19]} 24. Nc4 {[%emt 0:00:09]} Bd7 {[%emt 0:01:21]} 25. Ne3 {[%emt 0:00:37]} Bd6 {[%emt 0:00:26]} 26. f5 {[%emt 0:00:35]} exf5 {[%emt 0:00:18]} 27. Nc4 {[%emt 0:00:32]} Bf4 {[%emt 0:00:11]} 28. Rc3 {[%emt 0:00:41]} Ba4 {[%emt 0:00:32]} 29. Rdd3 {[%emt 0:00:22]} Bc6 {[%emt 0:00:21]} 30. f3 {[%emt 0:00:01]} Rg7 {[%emt 0:00:09]} 31. Kf1 {[%emt 0:00:12]} Rgd7 {[%emt 0:00:22]} 32. Bh3 {[%emt 0:00:08]} Rxd4 {[%emt 0:00:10]} 33. Rxd4 {[%emt 0:00:08]} Rxd4 {[%emt 0:00:03]} 34. Bxf5 {[%emt 0:00:01]} Bc7 {[%emt 0:00:14]} 35. h5 {[%emt 0:00:12]} Rf4 {[%emt 0:00:05]} 36. Bg4 {[%emt 0:00:11]} f5 {[%emt 0:00:06]} 37. Bh3 {[%emt 0:00:01]} Bxf3 {[%emt 0:00:02]} 38. Ke1 {[%emt 0:00:13]} Bxh5 {[%emt 0:00:03]} 39. Ne3 {[%emt 0:00:06]} Be5 {[%emt 0:00:07]} 40. Rb3 {[%emt 0:00:06]} Bf7 {[%emt 0:00:13]} 41. Rd3 {[%emt 0:00:02]} Bxb2 {[%emt 0:00:07]} 42. Nxf5 {[%emt 0:00:02]} Be6 {[%emt 0:00:10]} 43. Nd6 {[%emt 0:00:28]} Bxh3 {[%emt 0:00:03]} 44. Rxh3 {[%emt 0:00:00]} Rf6 {[%emt 0:00:06]} 45. Nc4 {[%emt 0:00:03]} Bd4 {[%emt 0:00:02]} 46. Kd2 {[%emt 0:00:03]} b5 {[%emt 0:00:04]} 47. Na5 {[%emt 0:00:01]} Bc5 {[%emt 0:00:04]} 48. Kc2 {[%emt 0:00:05]} Bb6 {[%emt 0:00:06]} 49. Nb3 {[%emt 0:00:02]} Rc6+ {[%emt 0:00:03]} 50. Kb2 {[%emt 0:00:03]} Re6 {[%emt 0:00:02]} 51. Nc1 {[%emt 0:00:05]} Bd4+ {[%emt 0:00:07]} 52. Ka2 {[%emt 0:00:06]} Kb7 {[%emt 0:00:06]} 53. a4 {[%emt 0:00:10]} b4 {[%emt 0:00:08]} 54. Rh4 {[%emt 0:00:09]} Bc3 {[%emt 0:00:11]} 55. Nd3 {[%emt 0:00:04]} Rd6 {[%emt 0:00:05]} 56. Nc5+ {[%emt 0:00:20]} Kb6 {[%emt 0:00:05]} 57. Ne4 {[%emt 0:00:02]} Rc6 {[%emt 0:00:02]} 58. Kb3 {[%emt 0:00:02]} a5 {[%emt 0:00:02]} 59. Rh5 {[%emt 0:00:03]} Bd4 {[%emt 0:00:03]} 60. Rd5 {[%emt 0:00:02]} Be3 {[%emt 0:00:04]} 61. Rb5+ {[%emt 0:00:02]} Ka6 {[%emt 0:00:01]} 62. Re5 {[%emt 0:00:02]} Bd4 {[%emt 0:00:04]} 63. Rd5 {[%emt 0:00:02]} Bb6 {[%emt 0:00:01]} 64. Rh5 {[%emt 0:00:11]} Re6 {[%emt 0:00:03]} 65. Nd2 {[%emt 0:00:08]} Re3+ {[%emt 0:00:01]} 66. Kc2 {[%emt 0:00:05]} Rc3+ {[%emt 0:00:01]} 67. Kb2 {[%emt 0:00:01]} Be3 {[%emt 0:00:03]} 68. Nb3 {[%emt 0:00:03]} Bg5 {[%emt 0:00:21]} 69. Rh2 {[%emt 0:00:10]} Re3 {[%emt 0:00:02]} 70. Rc2 {[%emt 0:00:06]} Kb6 {[%emt 0:00:04]} 71. Rf2 {[%emt 0:00:06]} Re5 {[%emt 0:00:07]} 72. Rf8 {[%emt 0:00:08]} Re2+ {[%emt 0:00:02]} 73. Kb1 {[%emt 0:00:01]} Re5 {[%emt 0:00:11]} 74. Rb8+ {[%emt 0:00:02]} Kc6 {[%emt 0:00:04]} 75. Ra8 {[%emt 0:00:02]} h5 {[%emt 0:00:09]} 76. Nxa5+ {[%emt 0:00:04]} Kd5 {[%emt 0:00:06]} 77. Nb7 {[%emt 0:00:10]} Kc4 {[%emt 0:00:10]} 78. Na5+ {[%emt 0:00:14]} Kd3 {[%emt 0:00:11]} 79. Nc6 {[%emt 0:00:03]} Re4 {[%emt 0:00:03]} 80. a5 {[%emt 0:00:06]} Bf6 {[%emt 0:00:04]} 81. Rf8 {[%emt 0:00:07]} Bc3 {[%emt 0:00:04]} 82. Ka2 {[%emt 0:00:04]} Kc4 {[%emt 0:00:04]} 83. Rf2 {[%emt 0:00:08]} Kb5 {[%emt 0:00:03]} 84. Na7+ {[%emt 0:00:10]} Kxa5 {[%emt 0:00:04]} 85. Nc8 {[%emt 0:00:05]} Re6 {[%emt 0:00:05]} 86. Rf5+ {[%emt 0:00:01]} Ka4 {[%emt 0:00:01]} 87. Rf2 {[%emt 0:00:10]} b3+ {[%emt 0:00:03]} 88. Kb1 {[%emt 0:00:01]} Re1# {[%emt 0:00:02]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "19.1"]
[White "Bjerre, Jonas Buhl"]
[Black "Zhu, Jiner"]
[Result "0-1"]
[ECO "E07"]
[WhiteElo "2550"]
[BlackElo "2459"]
[Annotator "ChessBase"]
[PlyCount "72"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:00]} 4. g3 {[%emt 0:00:00]} Bb4+ {[%emt 0:00:00]} 5. Bd2 {[%emt 0:00:01]} Be7 {[%emt 0:00:01]} 6. Bg2 {[%emt 0:00:01]} O-O {[%emt 0:00:01]} 7. O-O {[%emt 0:00:01]} c6 {[%emt 0:00:01]} 8. Bf4 {[%emt 0:00:01]} Nbd7 {[%emt 0:00:24]} 9. Nc3 {[%emt 0:00:09]} dxc4 {[%emt 0:00:16]} 10. e4 {[%emt 0:00:03]} a5 {[%emt 0:00:41]} 11. a4 {[%emt 0:00:23]} b5 {[%emt 0:02:07]} 12. axb5 {[%emt 0:01:22]} cxb5 {[%emt 0:00:01]} 13. d5 {[%emt 0:01:10]} exd5 {[%emt 0:02:04]} 14. exd5 {[%emt 0:00:02]} Bc5 {[%emt 0:00:29]} 15. Nxb5 {[%emt 0:00:10]} Qb6 {[%emt 0:00:35]} 16. Nfd4 {[%emt 0:01:20]} Ne8 {[%emt 0:01:14]} 17. d6 {[%emt 0:01:47]} Rb8 {[%emt 0:00:02]} 18. Qd2 {[%emt 0:00:46]} Ba6 {[%emt 0:01:17]} 19. Bc6 {[%emt 0:01:17]} Nef6 {[%emt 0:01:28]} 20. Rxa5 {[%emt 0:00:43]} c3 {[%emt 0:00:16]} 21. Qxc3 {[%emt 0:00:08]} Bxb5 {[%emt 0:00:12]} 22. Rxb5 {[%emt 0:00:33]} Bxd4 {[%emt 0:00:01]} 23. Rxb6 {[%emt 0:01:03]} Bxc3 {[%emt 0:00:03]} 24. Rxb8 {[%emt 0:00:10]} Nxb8 {[%emt 0:00:00]} 25. bxc3 {[%emt 0:00:21]} Nxc6 {[%emt 0:00:01]} 26. c4 {[%emt 0:00:00]} h6 {[%emt 0:00:17]} 27. Ra1 {[%emt 0:00:06]} Rc8 {[%emt 0:00:19]} 28. Ra4 {[%emt 0:00:16]} Kf8 {[%emt 0:00:03]} 29. Ra6 {[%emt 0:00:07]} Ke8 {[%emt 0:00:06]} 30. Rb6 {[%emt 0:00:01]} Nd7 {[%emt 0:00:10]} 31. Rb7 {[%emt 0:00:12]} Na5 {[%emt 0:00:02]} 32. Rb1 {[%emt 0:00:20]} Nxc4 {[%emt 0:00:03]} 33. Re1+ {[%emt 0:00:01]} Kf8 {[%emt 0:00:01]} 34. Re7 {[%emt 0:00:02]} Ncb6 {[%emt 0:00:02]} 35. Be3 {[%emt 0:00:03]} Rc6 {[%emt 0:00:11]} 36. Bxb6 {[%emt 0:00:21]} Nxb6 {[%emt 0:00:01]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "19.2"]
[White "Gukesh D"]
[Black "Shuvalova, Polina"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "2578"]
[BlackElo "2476"]
[Annotator "ChessBase"]
[PlyCount "101"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:09]} e6 {[%emt 0:00:00]} 3. Bf4 {[%emt 0:00:02]} d5 {[%emt 0:00:09]} 4. e3 {[%emt 0:00:01]} Bd6 {[%emt 0:00:02]} 5. Nbd2 {[%emt 0:00:03]} O-O {[%emt 0:00:04]} 6. Bd3 {[%emt 0:00:22]} Bxf4 {[%emt 0:00:06]} 7. exf4 {[%emt 0:00:02]} b6 {[%emt 0:00:01]} 8. Qe2 {[%emt 0:00:10]} c5 {[%emt 0:00:05]} 9. c3 {[%emt 0:00:05]} Nc6 {[%emt 0:00:14]} 10. Ne5 {[%emt 0:00:13]} Bb7 {[%emt 0:00:09]} 11. Ndf3 {[%emt 0:00:18]} cxd4 {[%emt 0:00:05]} 12. Nxc6 {[%emt 0:00:03]} Bxc6 {[%emt 0:00:01]} 13. Nxd4 {[%emt 0:00:01]} Rc8 {[%emt 0:00:12]} 14. O-O {[%emt 0:00:10]} Nd7 {[%emt 0:00:49]} 15. Rfe1 {[%emt 0:00:30]} Nc5 {[%emt 0:00:11]} 16. Bc2 {[%emt 0:00:56]} Qf6 {[%emt 0:00:06]} 17. Qg4 {[%emt 0:00:38]} Bd7 {[%emt 0:00:25]} 18. Re3 {[%emt 0:00:39]} h6 {[%emt 0:00:50]} 19. Re5 {[%emt 0:00:24]} Ba4 {[%emt 0:00:11]} 20. b3 {[%emt 0:00:34]} Bd7 {[%emt 0:00:06]} 21. Rae1 {[%emt 0:00:10]} Rfe8 {[%emt 0:01:11]} 22. Qg3 {[%emt 0:00:14]} a5 {[%emt 0:00:41]} 23. h4 {[%emt 0:00:40]} b5 {[%emt 0:00:09]} 24. f5 {[%emt 0:00:58]} exf5 {[%emt 0:01:07]} 25. Rxe8+ {[%emt 0:00:03]} Rxe8 {[%emt 0:00:47]} 26. Rxe8+ {[%emt 0:00:02]} Bxe8 {[%emt 0:00:01]} 27. Qb8 {[%emt 0:00:09]} Kf8 {[%emt 0:00:27]} 28. Nxb5 {[%emt 0:01:14]} Qxh4 {[%emt 0:02:37]} 29. Nc7 {[%emt 0:00:32]} Qe7 {[%emt 0:00:07]} 30. Nxd5 {[%emt 0:00:07]} Qe1+ {[%emt 0:00:14]} 31. Kh2 {[%emt 0:00:01]} Qxf2 {[%emt 0:00:17]} 32. Qd6+ {[%emt 0:00:05]} Kg8 {[%emt 0:00:01]} 33. Bxf5 {[%emt 0:00:14]} Ne4 {[%emt 0:00:38]} 34. Qb8 {[%emt 0:01:10]} Kf8 {[%emt 0:00:13]} 35. Qe5 {[%emt 0:00:22]} Qh4+ {[%emt 0:00:19]} 36. Bh3 {[%emt 0:00:04]} Nf2 {[%emt 0:00:13]} 37. Qd6+ {[%emt 0:01:04]} Kg8 {[%emt 0:00:01]} 38. Qg3 {[%emt 0:00:05]} Qxg3+ {[%emt 0:00:07]} 39. Kxg3 {[%emt 0:00:01]} Nd1 {[%emt 0:00:04]} 40. Bg4 {[%emt 0:00:10]} Nb2 {[%emt 0:00:09]} 41. Be2 {[%emt 0:00:02]} Kf8 {[%emt 0:00:04]} 42. Kf4 {[%emt 0:00:07]} Bc6 {[%emt 0:00:02]} 43. c4 {[%emt 0:00:12]} Ke8 {[%emt 0:00:11]} 44. Ke5 {[%emt 0:00:04]} Kd7 {[%emt 0:00:01]} 45. Kd4 {[%emt 0:00:02]} a4 {[%emt 0:00:01]} 46. Kc3 {[%emt 0:00:04]} a3 {[%emt 0:00:02]} 47. Kb4 {[%emt 0:00:05]} f5 {[%emt 0:00:12]} 48. Kxa3 {[%emt 0:00:02]} Bxd5 {[%emt 0:00:01]} 49. cxd5 {[%emt 0:00:02]} g5 {[%emt 0:00:05]} 50. Kxb2 {[%emt 0:00:02]} g4 {[%emt 0:00:06]} 51. Bd3 {[%emt 0:00:04]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "19.3"]
[White "Keymer, Vincent"]
[Black "Yoo, Christopher Woojin"]
[Result "0-1"]
[ECO "A50"]
[WhiteElo "2591"]
[BlackElo "2455"]
[Annotator "ChessBase"]
[PlyCount "86"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} b6 {[%emt 0:00:07]} 3. Nc3 {[%emt 0:00:09]} Bb7 {[%emt 0:00:01]} 4. Qc2 {[%emt 0:00:01]} d5 {[%emt 0:00:02]} 5. cxd5 {[%emt 0:00:01]} Nxd5 {[%emt 0:00:01]} 6. e4 {[%emt 0:00:35]} Nxc3 {[%emt 0:00:03]} 7. bxc3 {[%emt 0:00:00]} e5 {[%emt 0:00:01]} 8. dxe5 {[%emt 0:00:44]} Nd7 {[%emt 0:00:03]} 9. Nf3 {[%emt 0:00:07]} Qe7 {[%emt 0:00:03]} 10. Bb5 {[%emt 0:00:25]} O-O-O {[%emt 0:01:35]} 11. O-O {[%emt 0:00:12]} a6 {[%emt 0:02:20]} 12. Bxd7+ {[%emt 0:01:37]} Qxd7 {[%emt 0:01:13]} 13. Bg5 {[%emt 0:00:01]} Be7 {[%emt 0:00:02]} 14. Rad1 {[%emt 0:00:23]} Qe6 {[%emt 0:00:06]} 15. Bxe7 {[%emt 0:00:35]} Qxe7 {[%emt 0:00:10]} 16. Rd4 {[%emt 0:00:02]} c5 {[%emt 0:01:26]} 17. Rxd8+ {[%emt 0:00:35]} Rxd8 {[%emt 0:00:00]} 18. h3 {[%emt 0:00:22]} h6 {[%emt 0:01:03]} 19. a4 {[%emt 0:01:00]} Bc6 {[%emt 0:00:20]} 20. Rb1 {[%emt 0:00:23]} b5 {[%emt 0:00:10]} 21. axb5 {[%emt 0:00:08]} axb5 {[%emt 0:00:00]} 22. Ra1 {[%emt 0:00:56]} Qb7 {[%emt 0:00:34]} 23. Re1 {[%emt 0:00:43]} Qd7 {[%emt 0:01:09]} 24. Qa2 {[%emt 0:00:18]} Kb8 {[%emt 0:00:02]} 25. Qa3 {[%emt 0:00:58]} Qa7 {[%emt 0:00:18]} 26. Qc1 {[%emt 0:00:01]} Qa2 {[%emt 0:00:12]} 27. Qf4 {[%emt 0:00:21]} Kb7 {[%emt 0:00:02]} 28. Nh4 {[%emt 0:00:52]} Qd2 {[%emt 0:00:43]} 29. Qxd2 {[%emt 0:00:28]} Rxd2 {[%emt 0:00:00]} 30. Nf5 {[%emt 0:00:00]} Kb6 {[%emt 0:00:01]} 31. Nxg7 {[%emt 0:00:07]} b4 {[%emt 0:00:02]} 32. cxb4 {[%emt 0:00:01]} cxb4 {[%emt 0:00:00]} 33. Nf5 {[%emt 0:00:04]} b3 {[%emt 0:00:20]} 34. Nd6 {[%emt 0:00:13]} Bb5 {[%emt 0:00:09]} 35. Re3 {[%emt 0:00:13]} Rd1+ {[%emt 0:00:15]} 36. Kh2 {[%emt 0:00:03]} b2 {[%emt 0:00:00]} 37. Rb3 {[%emt 0:00:01]} b1=Q {[%emt 0:00:02]} 38. Rxb1 {[%emt 0:00:01]} Rxb1 {[%emt 0:00:00]} 39. Nxf7 {[%emt 0:00:01]} h5 {[%emt 0:00:11]} 40. g4 {[%emt 0:00:25]} h4 {[%emt 0:00:06]} 41. g5 {[%emt 0:00:09]} Be2 {[%emt 0:00:11]} 42. Kg2 {[%emt 0:00:06]} Rb3 {[%emt 0:00:02]} 43. f4 {[%emt 0:00:14]} Bf3+ {[%emt 0:00:05]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "19.4"]
[White "Mendonca, Leon Luke"]
[Black "Liang, Awonder"]
[Result "1/2-1/2"]
[ECO "A07"]
[WhiteElo "2549"]
[BlackElo "2592"]
[Annotator "TA"]
[PlyCount "159"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,159,-22,15,6,13,16,50,40,39,24,36,46,41,0,9,11,18,21,13,19,20,10,13,31,44,22,15,20,15,32,25,0,-7,-73,-60,-74,-61,-71,-65,-68,-70,-55,-66,-69,-22,-28,377,-62,-56,-68,-50,-70,-21,-55,0,0,0,-69,-70,-160,-160,-150,-150,-146,-141,-256,-243,-276,-270,-235,-267,-267,-269,-270,-294,-294,-234,-255,-102,-564,-470,-4662,-4105,-2324,-1754,-4901,-4894,-4870,-4840,-4833,-4814,-4814,-4774,-4766,-8,-8,-7,-83,-8,-72,0,-228,-58,-35,-33,-63,-67,-600,-586,-4766,-4759,-1395,-83,-83,-83,-83,-83,-83,-83,-83,-83,-83,-60,-83,-67,-83,-79,-69,-75,-83,0,-83,0,-83,-83,-163,-8,-8,-8,-8,0,0,0,0,0,0,0,0,0,0,0,0]} 1. Nf3 Nf6 2. g3 d5 3. Bg2 Nc6 4. d3 e5 5. a3 Be6 6. b4 {A07: Réti Opening: New York and Capablanca Systems.} Bd6 {[#]} 7. Bb2 $146 ({Predecessor:} 7. O-O Qd7 8. Bb2 O-O-O 9. b5 Ne7 10. Bxe5 h5 11. Bxd6 Qxd6 12. h4 Ng4 13. Nbd2 {1-0 (37) Mirzoev,A (2550)-Rodriguez Dobladez,V (1978) Balaguer 2005}) 7... a6 8. Nbd2 {White is slightly better.} Qd7 9. c4 d4 10. O-O Bh3 11. c5 Bxg2 12. Kxg2 Be7 13. Nc4 Qe6 14. Re1 e4 15. Nxd4 Nxd4 16. Bxd4 O-O-O 17. e3 h5 18. h3 Nh7 19. h4 ({Wrong is} 19. Qxh5 $2 Nf6 $19) 19... Bf6 20. Rc1 g5 21. dxe4 (21. c6 $11 b5 22. Nd2) 21... gxh4 $17 22. Qf3 Bxd4 23. exd4 Rxd4 24. Qf5 Qxf5 25. exf5 hxg3 26. fxg3 Ng5 (26... Rg8 {looks sharper.} 27. Red1 Rdg4 28. Rd3 h4 29. Kh3 hxg3 30. Kg2 Nf6) 27. Red1 Rhd8 {[%mdl 8192] [#]} (27... Re4 $11 {and Black is okay.}) 28. Rxd4 $2 (28. Nd6+ $1 $18 {[%mdl 512]} R4xd6 29. cxd6) 28... Rxd4 $18 {[%mdl 4096] Endgame KRN-KRN} 29. Rc2 f6 30. Na5 Rg4 31. c6 b6 (31... b5 $15) 32. Re2 $1 $11 {[%cal Re2e8]} Ne4 33. Nc4 (33. Kf3 $1 $11 Ng5+ 34. Kg2) 33... Kb8 $15 34. Ne3 (34. Kh2 $1 $15) 34... Rxg3+ $17 35. Kh2 Rf3 36. Kg2 Rf4 37. Nd5 (37. Re1 $17) 37... Rxf5 $19 38. Nxb6 Rg5+ 39. Kh2 cxb6 40. Rxe4 {KR-KR} Re5 41. Rf4 f5 42. Rh4 Kc7 43. Rxh5 Kxc6 (43... Re2+ $1 $19 44. Kg1 Re3) 44. Kg2 $2 {[%mdl 8192]} (44. Rh6+ $17 {nothing else works.} Kc7 45. Rh7+ Kd6 46. a4) 44... Kb5 45. Kf2 (45. Rh6 $142 Re2+ 46. Kf1) 45... Ka4 46. Rh6 Rb5 $1 47. Rh3 a5 48. bxa5 Rxa5 49. Ke2 Rd5 50. Rf3 b5 51. Ke1 Ka5 $2 (51... f4 $19 {Threatening ...Rd7.} 52. Ke2 Rd8) 52. Ke2 $11 Kb6 53. Rc3 (53. Rf4 $11) 53... Rd4 (53... f4 $17 54. Kf3 Rd4) 54. Ke3 (54. Rf3 $11 {keeps the balance.}) 54... Rc4 (54... Rd8 $17) 55. Rb3 $2 (55. Rxc4 $1 $11 {and White stays safe.} bxc4 56. Kd4) 55... Kc5 $2 (55... Ka5 $1 $19 56. Rd3 Ka4) 56. Kf3 Rd4 57. Kf2 Kb6 58. Rf3 $2 {[%mdl 8192]} (58. Ke3 $15 Rg4 59. Rb1) 58... f4 $19 59. Ke2 {[#]} Ka5 $1 60. Rb3 Re4+ $2 (60... Rd5 $19 {has better winning chances.} 61. Rh3 Ka4) 61. Kd2 $17 Ka4 62. Rf3 Rd4+ 63. Kc2 Ka5 64. Kc3 Re4 {White must now prevent ...Re3+.} (64... Rc4+ {feels hotter.} 65. Kd3 Ka4 66. Kd2 Rc6 67. Kd1 Rc5) 65. Kd2 Kb6 66. Rc3 Rc4 {Strongly threatening ...Rxc3.} 67. Rb3 Kc5 68. Ke2 Re4+ 69. Kd2 Kb6 (69... Re5 $17) 70. Rf3 (70. Rc3 $11) 70... Ka5 71. Rb3 $1 Re6 72. Rb4 {[#]} (72. Rd3 $17 {was necessary.}) 72... f3 $2 (72... Rd6+ $1 $19 73. Ke2 f3+ 74. Ke3 Rc6) 73. Rf4 $11 {The position is equal.} Re2+ 74. Kc3 $1 Rf2 (74... f2 {with more complications.} 75. Rf6 f1=R 76. Rxf1 Ka4 77. Rf8 Re3+) 75. Rf6 Rf1 (75... Rh2 {keeps more tension.} 76. Rxf3 Ka4 77. Kd4 Rh5 78. Rg3 Rh2) 76. Kb2 Rf2+ (76... f2 $5) 77. Kb3 Rf1 78. Kb2 Rf2+ (78... f2 $5) 79. Kb3 Rf1 80. Kb2 {And White is the lucky defender.  Weighted Error Value: White=0.85/Black=0.45} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "19.6"]
[White "Khademalsharieh, Sarasadat"]
[Black "Salimova, Nurgyul"]
[Result "1-0"]
[ECO "D27"]
[WhiteElo "2494"]
[BlackElo "2397"]
[Annotator "ChessBase"]
[PlyCount "95"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. d4 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 2. c4 {[%emt 0:00:00]} e6 {[%emt 0:00:00]} 3. Nf3 {[%emt 0:00:00]} d5 {[%emt 0:00:02]} 4. Nc3 {[%emt 0:00:02]} dxc4 {[%emt 0:00:02]} 5. e3 {[%emt 0:00:10]} a6 {[%emt 0:00:15]} 6. a4 {[%emt 0:00:15]} c5 {[%emt 0:00:06]} 7. Bxc4 {[%emt 0:00:02]} Nc6 {[%emt 0:00:10]} 8. O-O {[%emt 0:00:03]} cxd4 {[%emt 0:00:03]} 9. exd4 {[%emt 0:00:02]} Be7 {[%emt 0:00:03]} 10. Bg5 {[%emt 0:00:16]} O-O {[%emt 0:00:05]} 11. Re1 {[%emt 0:00:02]} Nb4 {[%emt 0:00:24]} 12. Qe2 {[%emt 0:00:08]} Bd7 {[%emt 0:00:20]} 13. Ne5 {[%emt 0:00:07]} Rc8 {[%emt 0:00:35]} 14. Rad1 {[%emt 0:00:23]} Be8 {[%emt 0:02:51]} 15. Bb3 {[%emt 0:03:34]} Qc7 {[%emt 0:00:52]} 16. Qf3 {[%emt 0:00:38]} Nc6 {[%emt 0:01:33]} 17. Qh3 {[%emt 0:01:52]} Qb6 {[%emt 0:01:48]} 18. Bxe6 {[%emt 0:01:30]} fxe6 {[%emt 0:00:49]} 19. Qxe6+ {[%emt 0:00:03]} Kh8 {[%emt 0:00:11]} 20. Qxc8 {[%emt 0:00:22]} Qxb2 {[%emt 0:00:27]} 21. Bxf6 {[%emt 0:00:34]} gxf6 {[%emt 0:00:25]} 22. Nxc6 {[%emt 0:00:30]} Bxc6 {[%emt 0:00:02]} 23. Qh3 {[%emt 0:00:01]} Bb4 {[%emt 0:00:06]} 24. Re3 {[%emt 0:00:15]} Qc2 {[%emt 0:00:24]} 25. Rf1 {[%emt 0:00:09]} Bxc3 {[%emt 0:00:25]} 26. Rxc3 {[%emt 0:00:02]} Qe4 {[%emt 0:00:00]} 27. Rg3 {[%emt 0:00:20]} Rg8 {[%emt 0:00:08]} 28. Rxg8+ {[%emt 0:00:22]} Kxg8 {[%emt 0:00:00]} 29. Qg3+ {[%emt 0:00:02]} Kf7 {[%emt 0:00:07]} 30. a5 {[%emt 0:00:05]} Qd5 {[%emt 0:00:09]} 31. h4 {[%emt 0:00:07]} Qxa5 {[%emt 0:00:02]} 32. Qg4 {[%emt 0:00:04]} Qd5 {[%emt 0:00:01]} 33. h5 {[%emt 0:00:03]} Qe4 {[%emt 0:00:11]} 34. Qxe4 {[%emt 0:00:02]} Bxe4 {[%emt 0:00:00]} 35. f3 {[%emt 0:00:01]} Bc6 {[%emt 0:00:03]} 36. Ra1 {[%emt 0:00:05]} Ke6 {[%emt 0:00:01]} 37. Kf2 {[%emt 0:00:02]} Kf5 {[%emt 0:00:03]} 38. g4+ {[%emt 0:00:04]} Kf4 {[%emt 0:00:08]} 39. Ra5 {[%emt 0:00:03]} Bd7 {[%emt 0:00:02]} 40. Rd5 {[%emt 0:00:06]} Be6 {[%emt 0:00:02]} 41. Rd6 {[%emt 0:00:03]} Bc8 {[%emt 0:00:01]} 42. Rxf6+ {[%emt 0:00:01]} Kg5 {[%emt 0:00:01]} 43. Rf8 {[%emt 0:00:01]} Be6 {[%emt 0:00:01]} 44. Kg3 {[%emt 0:00:04]} Bc4 {[%emt 0:00:10]} 45. f4+ {[%emt 0:00:02]} Kh6 {[%emt 0:00:02]} 46. Rc8 {[%emt 0:00:03]} Be6 {[%emt 0:00:06]} 47. Rc7 {[%emt 0:00:03]} Bd5 {[%emt 0:00:07]} 48. Kh4 {[%emt 0:00:04]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "19.7"]
[White "Abdusattorov, Nodirbek"]
[Black "Praggnanandhaa R"]
[Result "1/2-1/2"]
[ECO "B30"]
[WhiteElo "2627"]
[BlackElo "2608"]
[Annotator "TA"]
[PlyCount "161"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,161,6,7,-25,-24,-33,-15,-29,-32,-48,-39,-42,0,-23,6,-47,-47,-52,-45,-40,-35,-37,-35,-46,-43,-58,-57,-55,-55,-66,-55,-56,-56,-60,-41,-37,-26,-41,-14,-14,-13,-17,-16,-13,0,0,0,0,18,13,20,28,22,20,26,14,18,24,26,31,163,161,250,130,141,150,132,0,155,66,66,66,114,121,125,18,33,0,0,0,0,0,0,0,47,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. e4 c5 2. Nc3 Nc6 3. Bb5 Nd4 4. Bc4 e6 5. Nf3 Nf6 6. O-O a6 7. a4 {B30: Sicilian: 2...Nc6 3 Bb5, lines without ...g6.} d5 8. exd5 exd5 9. Re1+ Be7 10. Be2 O-O 11. d3 {[#]} h6 $146 ({Predecessor:} 11... Qd6 12. Bg5 h6 13. Bh4 Nf5 14. Bg3 Nxg3 15. hxg3 Bf5 16. Nd2 Rfe8 17. Bf3 Bf8 {0-1 (46) Jefic,S (2105)-Mazur,S (2360) Kemer 2009}) 12. Bf4 Bd6 13. Bg3 ({White should play} 13. Bxd6 $11 Qxd6 14. Nxd4 cxd4 15. Na2) 13... Bxg3 $15 14. hxg3 Re8 15. Nxd4 cxd4 16. Nb1 Qb6 17. Ra2 Bd7 18. a5 Qb4 19. Qd2 Qc5 20. Na3 Re7 21. Raa1 Rae8 22. Bf3 Bg4 23. Rxe7 Qxe7 24. Kf1 Bxf3 25. gxf3 Nd7 26. Kg2 Nb8 27. c4 dxc3 28. Qxc3 Nc6 29. Nc2 Qd6 30. Nd4 Nxd4 31. Qxd4 $11 {[%mdl 4096] Endgame KQR-KQR} Qc6 32. Rh1 Re2 33. Rh5 Qc1 34. Rxd5 Qxb2 35. Qc5 Re8 (35... Kh7 $14) 36. Rd7 $18 Qb3 {[#]} (36... Qe5 $142 37. Qb4 Rb8) 37. Qc7 (37. d4 $1 $18) 37... Re1 $16 38. Rd8+ ({Don't play} 38. Qxb7 $6 Qxb7 39. Rxb7 Re5 $11) 38... Kh7 {[#]} 39. Qc8 (39. Qd7 $1 $16 {[%cal Rd7f5] White wants to mate with Qf5+.} Qe6 40. Qxb7) 39... Qe6 (39... Qb5 $1 $11) 40. Rh8+ ({White should try} 40. Qxb7 $16 Re5 41. Rd7) 40... Kg6 $14 41. Qxb7 Qe2 {( -> ...Qf1+)} 42. Qe4+ Qxe4 43. dxe4 $16 {KR-KR} (43. fxe4 $16 {aiming for Ra8.} Ra1 44. d4) 43... Ra1 $11 44. Rb8 {Black must now prevent Rb6+.} Rxa5 45. Rb6+ f6 46. f4 Kf7 47. Rb7+ Kg6 48. Ra7 h5 {The position is equal.} 49. Kh3 Kh6 50. f5 Ra4 51. f3 Ra2 52. Ra8 {White threatens Rh8+ and mate.} Kh7 53. Ra7 Kh6 54. Ra8 {Threatening mate with Rh8+.} (54. f4 {keeps more tension.} Ra1 55. Kg2 Ra2+ 56. Kf3 Ra3+ 57. Ke2) 54... Kh7 55. g4 hxg4+ 56. Kxg4 a5 57. f4 Ra4 58. Kf3 {Threatening e5.} Ra3+ 59. Kf2 {e5 is the strong threat.} Ra2+ 60. Ke3 {Threatens to win with e5.} Ra3+ 61. Kd4 {And now e5 would win.} (61. Ke2 {is interesting.} Ra2+ 62. Kf3 Ra3+) 61... Rf3 $1 62. Rxa5 (62. Kd5 {with more complications.} Rxf4 63. Ra7 Kh6 64. Rxa5 Rf1 65. Ra3) 62... Rxf4 63. Ke3 Rh4 64. Ra7 Rh3+ 65. Kf4 Rh4+ 66. Kf3 Rh3+ 67. Kg4 Re3 68. Kf4 Re1 69. Ra8 Re2 70. Kf3 Rb2 71. Ra1 (71. Ke3 {seems wilder.} Rb4 72. Rf8 Kh6 73. Rg8 Kh7 74. Rf8) 71... Rb3+ 72. Kf4 Rb4 73. Rh1+ Kg8 74. Rc1 Kh7 75. Rc7 Ra4 76. Rb7 Rc4 77. Ra7 Rb4 78. Rc7 Ra4 79. Rb7 Rc4 80. Ra7 Rb4 81. Rc7 {Weighted Error Value: White=0.17/Black=0.16} 1/2-1/2

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "19.8"]
[White "Murzin, Volodar"]
[Black "Yip, Carissa"]
[Result "1-0"]
[ECO "C95"]
[WhiteElo "2478"]
[BlackElo "2430"]
[Annotator "ChessBase"]
[PlyCount "99"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:00]} a6 {[%emt 0:00:00]} 4. Ba4 {[%emt 0:00:01]} Nf6 {[%emt 0:00:00]} 5. O-O {[%emt 0:00:03]} Be7 {[%emt 0:00:01]} 6. Re1 {[%emt 0:00:01]} b5 {[%emt 0:00:03]} 7. Bb3 {[%emt 0:00:02]} d6 {[%emt 0:00:02]} 8. c3 {[%emt 0:00:05]} O-O {[%emt 0:00:02]} 9. h3 {[%emt 0:00:02]} Nb8 {[%emt 0:00:02]} 10. d4 {[%emt 0:00:03]} Nbd7 {[%emt 0:00:01]} 11. c4 {[%emt 0:00:08]} c6 {[%emt 0:00:06]} 12. Nc3 {[%emt 0:00:03]} b4 {[%emt 0:00:08]} 13. Na4 {[%emt 0:00:04]} c5 {[%emt 0:01:07]} 14. d5 {[%emt 0:00:04]} Ne8 {[%emt 0:00:07]} 15. Bc2 {[%emt 0:00:03]} a5 {[%emt 0:00:05]} 16. b3 {[%emt 0:00:02]} g6 {[%emt 0:00:08]} 17. a3 {[%emt 0:00:23]} Ng7 {[%emt 0:00:08]} 18. Nb2 {[%emt 0:00:04]} Nb6 {[%emt 0:00:14]} 19. Bd2 {[%emt 0:00:08]} f5 {[%emt 0:00:03]} 20. Qe2 {[%emt 0:00:06]} f4 {[%emt 0:00:08]} 21. axb4 {[%emt 0:00:07]} axb4 {[%emt 0:00:03]} 22. Rxa8 {[%emt 0:00:05]} Nxa8 {[%emt 0:00:01]} 23. Ra1 {[%emt 0:00:00]} Nb6 {[%emt 0:00:14]} 24. Nd3 {[%emt 0:00:11]} g5 {[%emt 0:00:28]} 25. Ra7 {[%emt 0:02:47]} Bf6 {[%emt 0:00:15]} 26. Nh2 {[%emt 0:00:15]} h5 {[%emt 0:00:08]} 27. Bd1 {[%emt 0:00:13]} Bd7 {[%emt 0:00:24]} 28. Qe1 {[%emt 0:00:25]} Qb8 {[%emt 0:00:21]} 29. Ra2 {[%emt 0:00:13]} Rd8 {[%emt 0:00:35]} 30. Be2 {[%emt 0:00:08]} Be8 {[%emt 0:00:28]} 31. Qa1 {[%emt 0:00:32]} Bg6 {[%emt 0:00:01]} 32. f3 {[%emt 0:00:27]} Rd7 {[%emt 0:00:02]} 33. Ra6 {[%emt 0:00:34]} Bd8 {[%emt 0:00:01]} 34. Be1 {[%emt 0:00:12]} Ne8 {[%emt 0:00:09]} 35. Bf2 {[%emt 0:00:02]} Nf6 {[%emt 0:00:58]} 36. Nxe5 {[%emt 0:02:07]} dxe5 {[%emt 0:00:05]} 37. Bxc5 {[%emt 0:00:02]} g4 {[%emt 0:01:33]} 38. Kh1 {[%emt 0:00:22]} Qb7 {[%emt 0:00:40]} 39. Bg1 {[%emt 0:00:42]} Bxe4 {[%emt 0:01:24]} 40. fxe4 {[%emt 0:00:04]} Nxe4 {[%emt 0:00:01]} 41. Nxg4 {[%emt 0:01:20]} Ng3+ {[%emt 0:00:17]} 42. Kh2 {[%emt 0:00:02]} Nxe2 {[%emt 0:00:21]} 43. Nxe5 {[%emt 0:00:14]} Rg7 {[%emt 0:00:11]} 44. Bxb6 {[%emt 0:00:24]} f3 {[%emt 0:00:33]} 45. gxf3 {[%emt 0:00:26]} Nf4 {[%emt 0:01:25]} 46. Bxd8 {[%emt 0:00:16]} Qc8 {[%emt 0:00:16]} 47. Ng4 {[%emt 0:00:03]} hxg4 {[%emt 0:00:02]} 48. fxg4 {[%emt 0:00:09]} Qc5 {[%emt 0:00:25]} 49. Bb6 {[%emt 0:00:07]} Qd6 {[%emt 0:00:19]} 50. Bd4 {[%emt 0:00:07]} 1-0

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "19.9"]
[White "Mammadzada, Gunay"]
[Black "Lei, Tingjie"]
[Result "0-1"]
[ECO "C67"]
[WhiteElo "2443"]
[BlackElo "2505"]
[Annotator "RC"]
[PlyCount "130"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "600+5"]

1. e4 {[%emt 0:00:00]} e5 {[%emt 0:00:00]} 2. Nf3 {[%emt 0:00:00]} Nc6 {[%emt 0:00:00]} 3. Bb5 {[%emt 0:00:00]} Nf6 {[%emt 0:00:00]} 4. O-O {[%emt 0:00:01]} Nxe4 {[%emt 0:00:01]} 5. Re1 {[%emt 0:00:01]} Nd6 {[%emt 0:00:01]} 6. Nxe5 {[%emt 0:00:02]} Be7 {[%emt 0:00:02]} 7. Bf1 {[%emt 0:00:02]} Nxe5 {[%emt 0:00:01]} 8. Rxe5 {[%emt 0:00:02]} O-O {[%emt 0:00:02]} 9. d4 {[%emt 0:00:01]} Bf6 {[%emt 0:00:01]} 10. Re1 {[%emt 0:00:01]} Re8 {[%emt 0:00:04]} 11. c3 {[%emt 0:00:02]} Rxe1 {[%emt 0:00:10]} 12. Qxe1 {[%emt 0:00:02]} Ne8 {[%emt 0:01:00]} 13. d5 {[%emt 0:00:03]} d6 {[%emt 0:00:03]} 14. Nd2 {[%emt 0:00:02]} c6 {[%emt 0:00:04]} 15. Ne4 {[%emt 0:01:05]} Be7 {[%emt 0:00:58]} 16. Bf4 {[%emt 0:00:41]} cxd5 {[%emt 0:00:13]} 17. Ng3 {[%emt 0:00:05]} Be6 {[%emt 0:00:12]} 18. Bd3 {[%emt 0:00:09]} Bg5 {[%emt 0:00:15]} 19. Qe3 {[%emt 0:00:16]} Bxf4 {[%emt 0:00:03]} 20. Qxf4 {[%emt 0:00:01]} Qf6 {[%emt 0:00:09]} 21. Qb4 {[%emt 0:00:06]} Qe7 {[%emt 0:00:19]} 22. Re1 {[%emt 0:00:06]} Qd7 {[%emt 0:00:54]} 23. Ne2 {[%emt 0:00:18]} a5 {[%emt 0:00:26]} 24. Qb6 {[%emt 0:00:10]} Qc7 {[%emt 0:00:22]} 25. Qe3 {[%emt 0:00:07]} Nf6 {[%emt 0:00:14]} 26. Nd4 {[%emt 0:00:24]} Re8 {[%emt 0:00:12]} 27. Qg3 {[%emt 0:01:31]} Bd7 {[%emt 0:02:15]} 28. Rxe8+ {[%emt 0:01:40]} Nxe8 {[%emt 0:00:02]} 29. Qe3 {[%emt 0:00:01]} Qd8 {[%emt 0:00:04]} 30. f3 {[%emt 0:01:15]} Nf6 {[%emt 0:00:19]} 31. Be2 {[%emt 0:00:33]} Kf8 {[%emt 0:00:28]} 32. g4 {[%emt 0:00:06]} h6 {[%emt 0:00:36]} 33. Kf2 {[%emt 0:00:04]} Qe7 {[%emt 0:01:18]} 34. Qxe7+ {[%emt 0:00:35]} Kxe7 {[%emt 0:00:02]} 35. Ke3 {[%emt 0:00:02]} g5 {[%emt 0:00:16]} 36. h3 {[%emt 0:01:51]} h5 {[%emt 0:00:02]} 37. Bd3 {[%emt 0:00:07]} hxg4 {[%emt 0:00:10]} 38. hxg4 {[%emt 0:00:06]} Be6 {[%emt 0:00:04]} 39. b3 {[%emt 0:00:43]} Nd7 {[%emt 0:00:02]} 40. Nc2 {[%emt 0:00:11]} Ne5 {[%emt 0:00:04]} 41. Be2 {[%emt 0:00:01]} Ng6 {[%emt 0:00:10]} 42. Bd3 {[%emt 0:00:28]} Nf4 {[%emt 0:00:05]} 43. Bh7 {[%emt 0:00:02]} Kf6 {[%emt 0:00:04]} 44. Nd4 {[%emt 0:00:05]} Ke5 {[%emt 0:00:04]} 45. Bc2 {[%emt 0:00:14]} Bd7 {[%emt 0:00:14]} 46. Bb1 {[%emt 0:00:15]} Ng2+ {[%emt 0:00:07]} 47. Kf2 {[%emt 0:00:02]} Nh4 {[%emt 0:00:09]} 48. Kg3 {[%emt 0:00:02]} f5 {[%emt 0:00:14]} 49. f4+ {[%emt 0:00:11]} Kf6 {[%emt 0:00:01]} 50. fxg5+ {[%emt 0:00:10]} Kxg5 {[%emt 0:00:01]} 51. gxf5 {[%emt 0:00:05]} Bxf5 {[%emt 0:00:07]} 52. Nxf5 {[%emt 0:00:02]} Nxf5+ {[%emt 0:00:01]} 53. Kf3 {[%emt 0:00:00]} d4 {[%emt 0:00:19]} 54. cxd4 {[%emt 0:00:14]} Nxd4+ {[%emt 0:00:01]} 55. Ke4 {[%emt 0:00:00]} Nb5 {[%emt 0:00:03]} 56. Kd3 {[%emt 0:00:05]} Kf4 {[%emt 0:00:02]} 57. a4 {[%emt 0:00:03]} Nc7 {[%emt 0:00:11]} 58. Kd4 {[%emt 0:00:04]} b6 {[%emt 0:00:02]} 59. Bc2 {[%emt 0:00:06]} Kf3 {[%emt 0:00:02]} 60. Bd3 {[%emt 0:00:07]} Kf2 {[%emt 0:00:02]} 61. Kc4 {[%emt 0:00:07]} Ke3 {[%emt 0:00:01]} 62. Bf1 {[%emt 0:00:07]} d5+ {[%emt 0:00:03]} 63. Kc3 {[%emt 0:00:01]} Ne6 {[%emt 0:00:03]} 64. b4 {[%emt 0:00:02]} Nd4 {[%emt 0:00:49]} 65. Ba6 {[%emt 0:00:20]} Nf5 {[%emt 0:00:23]} 0-1

[Event "Polgar Challenge 2021"]
[Site "Online"]
[Date "2021.04.04"]
[Round "19.10"]
[White "Nihal Sarin"]
[Black "Badelka, Olga"]
[Result "1-0"]
[ECO "D02"]
[WhiteElo "2620"]
[BlackElo "2433"]
[Annotator "TA"]
[PlyCount "79"]
[EventDate "2021.04.08"]
[EventType "tourn"]
[EventCountry "NET"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 17,79,0,0,-10,6,-5,-6,-20,-16,-29,0,0,6,-30,0,0,72,-25,-17,-12,-11,0,0,-17,171,165,151,153,283,284,327,328,322,324,306,298,288,311,396,407,433,411,479,383,593,450,437,437,607,489,688,674,856,850,850,825,1029,1002,2743,2609,5547,5557,6495,5929]} 1. d4 Nf6 2. Bf4 e6 3. e3 d5 4. Nd2 Bd6 5. Bg3 O-O 6. Ngf3 c5 7. c3 b6 8. Ne5 Bb7 9. Bd3 Nc6 10. O-O {D02: 1 d4 d5 2 Nf3 sidelines, including 2...Nf6 3 g3 and 2...Nf6 3 Bf4.} Ne7 11. Bh4 Ne4 12. Bxe4 {The position is equal.} dxe4 13. Nec4 {[#]} Bc7 $146 ({Predecessor:} 13... cxd4 14. exd4 b5 15. Nxd6 Qxd6 16. Re1 Nf5 17. Nxe4 Qc6 18. Bg5 Nd6 19. f3 Nxe4 20. Rxe4 {½-½ (38) Ju,W (2579)-Kosteniuk,A (2555) Doha 2016}) 14. dxc5 bxc5 15. Qc2 Re8 16. Rfd1 ({But not} 16. Nxe4 $2 Qd5 $19) 16... Qd5 (16... Qb8 $11 {keeps the balance.}) 17. b3 (17. Bg3 $16 Rac8 18. Qa4) 17... Qh5 18. Bg3 Bxg3 19. hxg3 Rad8 20. Nf1 {Hoping for Nd6.} Nf5 {[#] This costs Black the game.} (20... Bd5 $11 {and Black is okay.}) 21. Nh2 $1 $18 Rxd1+ 22. Rxd1 {Black must now prevent g4.} Qg5 {[#]} (22... Nh6 $16 {was called for.}) 23. g4 $1 {[%cal Rg4f5]} Nh6 24. Nd6 $1 {[%csl LRb7,LRe4,LRe8][%mdl 64] Double Attack} Rb8 25. Nxb7 ({Less strong is} 25. Nxe4 Qe7 $16) 25... Rxb7 26. Qxe4 Rb8 27. Rd7 Kh8 28. Rxa7 f5 29. gxf5 exf5 30. Qf4 Qd8 (30... Qxf4 {is a better defense.} 31. exf4 g6) 31. Nf1 {White is clearly winning.} Rc8 32. Qe5 {[%csl Ga7][%cal Re5g7]} Qg5 33. Re7 Rf8 (33... Ng8 $142) 34. Re8 Rxe8 35. Qxe8+ Ng8 36. a4 {[%cal Ba2a4,Ba4a5,Ba5a6][%mdl 32]} h5 37. a5 h4 38. a6 h3 39. Ng3 f4 40. Qh5+ {Weighted Error Value: White=0.23/Black=0.69} 1-0

