[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.06"]
[Round "1.1"]
[White "Nguyen, Thai Dai Van"]
[Black "Ju, Wenjun"]
[Result "1/2-1/2"]
[ECO "C42"]
[WhiteElo "2546"]
[BlackElo "2580"]
[Annotator "TA"]
[PlyCount "73"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 19,73,14,0,0,28,-6,50,21,20,25,17,23,19,7,16,25,25,29,19,0,0,0,44,38,39,29,33,0,0,7,6,0,19,19,15,6,19,19,19,19,19,7,19,19,19,19,19,19,19,19,19,19,20,19,19,20]} 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3 Nxc3 6. dxc3 Be7 7. Be3 O-O 8. Qd2 Nd7 9. O-O-O c6 10. Bd3 d5 11. h4 {C42: Petroff Defence: 3 Nxe5 and unusual White 3rd moves} Re8 12. Rde1 $146 ({Predecessor:} 12. Kb1 Bc5 13. Bd4 Bxd4 14. cxd4 Nf6 15. Rde1 Ne4 {½-½ (34) Karjakin,S (2782)-Giri,A (2782) Leuven 2018}) 12... Bc5 (12... Nc5 $11) 13. Ng5 {White is slightly better.} h6 14. Bh7+ Kf8 15. Bxc5+ Nxc5 16. Rxe8+ Qxe8 17. Re1 Qd8 18. Qe3 Ne6 19. Nxe6+ Bxe6 20. Qf4 {[#] And now Rxe6 would win.} Qf6 21. Qxf6 gxf6 $14 {[%mdl 4096] Endgame KRB-KRB} 22. Bd3 Ke7 23. c4 dxc4 {The position is equal.} 24. Bxc4 f5 25. g3 Rd8 26. Bd3 Kf6 27. b3 b6 28. Re3 Rd4 29. c3 Rg4 30. f4 Rg8 31. c4 c5 32. Bf1 Rd8 33. Kc2 Rd7 34. Bg2 Rd8 35. Bf3 a5 36. Rd3 Rxd3 37. Kxd3 {Accuracy: White = 57%, Black = 58%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.06"]
[Round "1.2"]
[White "Paravyan, David"]
[Black "Stocek, Jiri"]
[Result "1-0"]
[ECO "B62"]
[WhiteElo "2627"]
[BlackElo "2592"]
[Annotator "TA"]
[PlyCount "45"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 16,45,50,48,59,46,60,45,91,51,100,100,196,203,233,233,292,275,225,108,112,116,124,123,102,102,118,94,189,182,1787,1701]} 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 Nc6 6. Bg5 e6 7. Qd3 a6 8. Nxc6 {B62: Sicilian: Richter-Rauzer: 6...e6: Unusual White 7th moves} bxc6 9. O-O-O {LiveBook: 7 Games. e5! is the strong threat.} Qa5 (9... Be7 10. Bxf6 gxf6 11. f4 Bb7 12. f5 exf5 13. exf5 d5 14. Qe3 Qc7 15. Be2 O-O-O {½-½ (34) Brkic,A (2563)-Demchenko,A (2679) Skopje 2018}) 10. Qg3 {White is slightly better.} Rb8 11. Bc4 h6 $146 ({Predecessor:} 11... Be7 12. Bd2 Qc5 13. Bb3 O-O 14. f4 e5 15. f5 Rd8 {1-0 (81) Lagno,K (2530)-Soumya,S (2375) Caleta 2017}) 12. Be3 Nd7 13. Bb3 c5 (13... Rb7 $16) 14. Bf4 $18 e5 15. Bd2 Qc7 16. Nd5 Qb7 {intending ...c4.} 17. Ba5 (17. Bc3 $18 {has better winning chances.}) 17... c4 $16 18. Nc7+ ({Don't do} 18. Bxc4 Qxb2+ 19. Kd2 Qd4+ 20. Bd3 Nc5 $11) 18... Ke7 19. Bxc4 $40 {[%mdl 128] Black is in trouble.} Qxb2+ 20. Kd2 Qd4+ 21. Qd3 Qc5 {[#]} (21... Bb7 $16) 22. Qd5 $1 $18 {[%cal Rd5f7]} Qxf2+ $2 (22... Qxd5+ 23. Nxd5+ Ke8) 23. Kc3 {Precision: White = 73%, Black = 15%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.06"]
[Round "1.3"]
[White "Praggnanandhaa, R."]
[Black "Bartel, Mateusz"]
[Result "0-1"]
[ECO "C77"]
[WhiteElo "2532"]
[BlackElo "2600"]
[Annotator "TA"]
[PlyCount "68"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,68,26,12,10,15,9,10,12,9,17,14,13,0,0,-6,0,-38,-23,-68,-22,-35,-39,-26,-40,-46,-24,-91,-89,-133,-139,-140,-137,-129,-129,-206,-178,-353,-333,-483,-478,-476,-453,-574,-565,-585,-569,-902,-662,-677,-817,-817,-817,-817,-817,-1336,-1201,-1180,-657,-643,-632]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d3 d6 6. c4 Be7 {C77: Ruy Lopez: 3...a6 4 Ba4 Nf6, unusual lines} 7. h3 O-O 8. O-O Nd4 {The position is equal.} (8... Nd7 9. Be3 Bf6 10. c5 Ne7 11. cxd6 cxd6 12. Nc3 b5 13. Bb3 Bb7 14. a3 Nc5 15. Ba2 {½-½ (24) Van Foreest,J (2629)-Amin,B (2693) Wijk aan Zee 2018}) 9. Nxd4 exd4 10. Nd2 Rb8 11. f4 b5 12. Bb3 c5 13. e5 $146 ({Predecessor:} 13. Nf3 bxc4 14. Bxc4 {0-1 (47) Cornette,D (2439)-Gozzoli,Y (2565) chess.com INT 2018}) 13... Ne8 14. Qh5 bxc4 15. Bxc4 d5 $36 {[%mdl 2048] White must now prevent ...g6. Black is pushing.} 16. Bb3 g6 17. Qf3 Be6 18. f5 (18. g4 $11) 18... gxf5 $17 19. Qe2 Kh8 20. Nf3 Rg8 21. Kh2 Rg6 22. Bf4 {[#]} (22. Ne1 $17 {might work better.}) 22... Ng7 $1 $19 23. Nd2 $2 (23. Ne1) 23... Bg5 24. Rac1 (24. Rf2 {was worth a try.}) 24... Bxf4+ {Black is clearly winning.} 25. Rxf4 Qg5 26. Rf2 Nh5 ({Not} 26... c4 27. dxc4 dxc4 28. Bxc4 $17) 27. Qf3 Rbg8 28. Rxc5 Qh4 29. Nf1 f4 30. Rfc2 {[#]} Rg3 $1 {[%mdl 512]} 31. Nxg3 Rxg3 32. Qf1 {[#]} f3 $1 {[%mdl 512]} 33. Bxd5 (33. gxf3 Bxh3) 33... Bxd5 34. Rxd5 fxg2 {Accuracy: White = 39%, Black = 86%.} 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.06"]
[Round "1.4"]
[White "Shirov, Alexei"]
[Black "Anton Guijarro, David"]
[Result "0-1"]
[ECO "C77"]
[WhiteElo "2667"]
[BlackElo "2643"]
[Annotator "TA"]
[PlyCount "60"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,60,9,7,15,0,0,-8,0,-12,12,8,24,-30,-24,-20,-22,-18,-2,-7,-12,-18,-6,-8,-17,-21,-18,-216,-160,-178,-146,-129,-129,-328,-342,-332,-315,-328,-317,-392,-385,-369,-367,-364,-370,-363,-347,-403,-375,-392,-391]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. d3 Bc5 6. c3 d6 7. O-O Ba7 {C78: Ruy Lopez: Archangelsk and Möller Defences} 8. Bg5 (8. Re1 O-O 9. h3 Ne7 10. Nbd2 Ng6 11. Nf1 c6 12. Ng3 d5 13. Bb3 dxe4 14. dxe4 Qxd1 15. Rxd1 {½-½ (15) Grischuk,A (2750)-Tomashevsky,E (2696) Moscow 2017}) 8... h6 9. Bh4 g5 {The position is equal.} 10. Bg3 h5 $146 {[#] And now ...b5 would win.} ({Predecessor:} 10... Bg4 11. Nbd2 Nh5 12. Bxc6+ bxc6 13. Qa4 Nxg3 14. hxg3 Bd7 15. Nc4 h5 16. d4 c5 17. Qxa6 cxd4 18. Qb7 Qb8 19. Qd5 Be6 20. Qc6+ Bd7 21. Qd5 Be6 {½-½ (21) Czarnota,P (2575)-Buhmann,R (2583) Polanica Zdroj 2007}) 11. h4 (11. Nxg5 $2 h4 $19) 11... Nh7 12. Nbd2 (12. d4 $142) 12... g4 $11 13. Ne1 Nf8 14. d4 exd4 15. Bxc6+ bxc6 {[%cal Bb7c6,Bc6c5][%mdl 32]} 16. cxd4 Ng6 17. Qa4 Bd7 18. e5 d5 19. f3 $2 (19. Nd3 $11 {and White stays safe.}) 19... c5 $36 {[%mdl 2048] Black is in control.} 20. Qa3 c4 (20... cxd4 21. Nd3 $17) 21. Nc2 Bf5 22. Nb4 $2 (22. Qc3 $17) 22... Bxd4+ $19 {[%mdl 64] [#] Double Attack} 23. Kh2 {Strongly threatening Nc6.} Qd7 ({Less strong is} 23... Nxe5 24. Rfe1 $17) (23... Bxe5 24. Bxe5 Nxe5 25. Rfe1 $11) 24. Nxa6 Ra7 25. Rad1 Qc8 26. Qa4+ Bd7 ({Resist} 26... c6 27. Nxc4 dxc4 28. Rxd4 $19) 27. Qa5 Be6 ({Don't take} 27... Qxa6 28. Qxd5 c5 29. Ne4 $19) (27... Bc6 $2 28. Nxc7+ Qxc7 29. Qxc7 $19) 28. Nxc4 {Nxc7+! is the strong threat.} Qxa6 29. Rxd4 Qxa5 30. Nxa5 Rxa5 {Accuracy: White = 40%, Black = 89%.} 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.06"]
[Round "1.5"]
[White "Krejci, Jan"]
[Black "Michalik, Peter"]
[Result "0-1"]
[ECO "D31"]
[WhiteElo "2570"]
[BlackElo "2565"]
[Annotator "TA"]
[PlyCount "116"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,116,19,5,0,-10,-14,-18,-22,-18,58,-15,-16,-20,-16,-22,-20,-44,-26,-18,-25,-46,-41,-50,-48,-120,-51,-124,-49,-112,-95,-96,-94,-114,-104,-114,-85,-83,-81,-72,-82,-104,-99,-108,-108,-109,-103,-511,0,-107,-102,-79,-87,-85,-23,-28,-10,-87,-87,-91,-62,-85,-85,-93,-82,-145,-129,-129,-124,-222,-216,-223,-238,-190,-174,-190,-125,-131,-107,-171,-175,-174,-168,-224,-224,-224,-216,-212,-179,-179,-175,-212,-90,-664,-614,-657,-610,-697,-681,-664,-636,-582,-559,-416,-394,-655,-475]} 1. c4 e6 2. Nc3 d5 3. d4 Be7 4. Bf4 Nf6 5. e3 O-O 6. Rc1 {D35: Queen's Gambit Declined: Exchange Variation} (6. Nf3 c5 7. dxc5 Bxc5 8. cxd5 Nxd5 9. Nxd5 exd5 10. Bd3 Bb4+ 11. Nd2 Nc6 12. O-O Be7 13. a3 Bf6 14. Rb1 Re8 15. Nf3 Bg4 16. h3 Bh5 17. g4 Bg6 18. Bxg6 hxg6 {½-½ (39) Hammer,J (2662)-Akobian,V (2641) Saint Louis 2018}) 6... b6 7. cxd5 {LiveBook: 3 Games} Nxd5 8. Nxd5 {The position is equal.} Qxd5 9. a3 Qa5+ 10. Qd2 Qxd2+ 11. Kxd2 c5 $1 12. Be2 $146 {Bf3 is the strong threat.} ({Predecessor:} 12. Nf3 Bb7 13. dxc5 {1-0 (56) Girya,O (2444)-Khotenashvili,B (2454) Chengdu 2016}) 12... Nc6 {[%cal Bb8c6,Bc6a5,Ba5b3][%mdl 32]} 13. Bf3 Bd7 14. Ne2 Rac8 15. dxc5 Na5 {And now ...Nb3+ would win.} 16. Ke1 {White wants to play b4.} Nb3 17. Rd1 Nxc5 {Threatens to win with ...Ba4.} 18. Nc3 (18. Bd6 $15 Bxd6 19. Rxd6) 18... Rfd8 (18... Bf6 $1 $17 19. Bb7 Bxc3+ 20. bxc3 Rcd8) 19. Bd6 (19. Be5 $15) 19... Kf8 ({Black should play} 19... Bf6 $1 $17 {White must now prevent ...Na4.} 20. Bxc5 bxc5) 20. h4 ({Better is} 20. Bxe7+ $15 Kxe7 21. g3) 20... Bxd6 $17 21. Rxd6 Ke7 22. Rd2 Na4 $1 {[%cal Ra4c3]} 23. Nd1 Rc1 24. h5 Nc5 25. Rh4 e5 26. Rb4 g5 27. hxg6 hxg6 28. Rd5 Rc2 29. Be4 $2 {[%mdl 8192]} (29. Rxe5+ $17 {is tougher.} Be6 30. Be4) 29... Rc1 $2 (29... Nxe4 $19 {is more deadly.} 30. Rxe5+ Kf6 31. Rexe4 Bb5 $1 {[%mdl 512]}) 30. Bf3 $1 Bf5 {aiming for ...Nd3+.} 31. Rxd8 Kxd8 32. Be2 Be6 ({Black should try} 32... Rc2 $17 33. e4 Be6) 33. Kd2 Ra1 34. Nc3 (34. Rh4 $11 {keeps the balance.}) 34... Nb3+ 35. Kc2 Rc1+ 36. Kd3 Rg1 37. g3 Rg2 38. Nd1 (38. Bd1 $142 Na5 39. Ke2) 38... Nc5+ 39. Kd2 g5 $1 40. Bf3 (40. Ke1 $17) 40... Rh2 $19 41. a4 Kc7 42. a5 Nb3+ 43. Ke1 Nxa5 (43... f5 $1 $19 44. axb6+ axb6) 44. Nc3 $17 Nb7 45. Bxb7 (45. Ra4 $17 Kb8 46. b4) 45... Kxb7 {[%mdl 4096] Endgame KRB-KRN} 46. Ne4 Bd5 47. Nxg5 (47. Nc3 {might work better.} Bc6 48. e4) 47... f6 $19 48. Ne4 a5 49. Nxf6 axb4 50. Nxd5 {KR-KN} b3 51. Nf6 {[#]} Rh8 (51... Rh6 $1 $19 {[%cal Rh6f6]} 52. Ne4 Rc6) 52. g4 $2 {[%mdl 8192] [#]} (52. Ne4 $17) 52... Rc8 $1 {[%cal Rc8c1]} 53. Ne4 {Hoping for Nd6+.} Rc2 54. g5 Rxb2 55. Nd2 Kc6 56. g6 Ra2 57. Nxb3 Kd5 58. g7 $2 (58. Nd2 Ra1+ 59. Ke2) 58... Ra8 {Precision: White = 36%, Black = 67%.} 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.07"]
[Round "2.1"]
[White "Anton Guijarro, David"]
[Black "Krejci, Jan"]
[Result "1/2-1/2"]
[ECO "D35"]
[WhiteElo "2643"]
[BlackElo "2570"]
[Annotator "TA"]
[PlyCount "76"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 26,76,24,4,12,0,27,18,20,21,36,38,32,28,54,39,50,0,0,0,0,0,0,0,0,0,33,33,187,10,92,0,58,37,32,41,45,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. c4 e6 2. Nc3 d5 3. d4 Nf6 4. cxd5 Nxd5 5. e4 Nxc3 6. bxc3 c5 7. Nf3 cxd4 8. cxd4 Bb4+ 9. Bd2 Bxd2+ 10. Qxd2 O-O 11. Bc4 b6 12. O-O Bb7 13. Rfe1 Nd7 14. Rad1 Rc8 {D41: Queen's Gambit Declined: Semi-Tarrasch with 5 cxd5} 15. Bb3 Qe7 (15... Re8 16. h3 Nf6 17. Qf4 Nh5 18. Qh2 h6 19. d5 exd5 20. e5 g6 21. Nd4 Ng7 22. Nb5 {½-½ (54) Mamedyarov,S (2820)-Ding,L (2804) Batumi 2018}) 16. d5 {[%cal Bd4d5,Bd5d6][%mdl 32]} Nc5 17. d6 Qd8 $146 ({Predecessor:} 17... Qf6 18. e5 Nxb3 19. axb3 Qg6 20. Re3 f6 21. exf6 Rxf6 {½-½ (138) Brunello,S (2566)-Naiditsch,Y (2405) Douglas 2016}) 18. e5 Bxf3 19. gxf3 Qd7 20. f4 f6 21. f5 (21. Bc4 {with more complications.} Qc6 22. Rc1 Qf3 23. Qe3 Qg4+ 24. Qg3) 21... Nxb3 22. axb3 {[#] aiming for exf6.} fxe5 23. Rxe5 Rxf5 24. Rxf5 exf5 $11 {[%mdl 4096] Endgame KQR-KQR} 25. Re1 f4 26. Qxf4 Rf8 $2 {[#]} (26... Qf7 $1 $14 27. Qxf7+ Kxf7) 27. Qg3 $2 (27. Qd4 $1 $18 {Strongly threatening Re7.} Qf7 28. Re7 Qg6+ 29. Kf1 Qb1+ {[%mdl 64] Double Attack} 30. Re1 Qxb3 31. d7 Qb5+ 32. Kg1 Qg5+ 33. Kh1) 27... Re8 (27... Qc6 $11) 28. Rc1 (28. Rxe8+ $16 Qxe8 29. Qg4) 28... g6 ({Black should try} 28... Qf5 $11) 29. Qf4 {Black must now prevent Rc7.} Qe6 30. Qd4 Qf5 {And now ...Qg5+ would win.} 31. h4 {Hoping for Rc7.} Re4 {The position is equal.} 32. Rc8+ $1 Qxc8 33. Qxe4 {KQ-KQ} Qd7 34. Qf4 a5 35. Qc4+ Kf8 36. Qd4 {Threatens to win with Qh8+.} Kf7 37. Qxb6 Qg4+ 38. Kf1 Qd1+ {Accuracy: White = 38%, Black = 39%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.07"]
[Round "2.2"]
[White "Ju, Wenjun"]
[Black "Michalik, Peter"]
[Result "1-0"]
[ECO "B31"]
[WhiteElo "2580"]
[BlackElo "2565"]
[Annotator "TA"]
[PlyCount "61"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 16,61,15,19,12,21,25,24,26,32,22,31,56,53,45,16,75,77,74,76,95,101,107,41,20,0,0,0,0,22,14,6,105,98,106,94,91,95,179,166,533,552,560,558,606,593,839,824]} 1. e4 c5 2. Nf3 Nc6 3. Bb5 g6 4. Bxc6 dxc6 5. d3 Bg7 6. h3 Nf6 7. Nc3 Nd7 8. Be3 e5 9. Qd2 h6 {B31: Sicilian: 2...Nc6 3 Bb5 g6} 10. O-O Qe7 (10... b6 11. a3 Nf8 12. b4 Ne6 13. bxc5 f5 14. exf5 gxf5 15. Qe1 O-O 16. Rb1 e4 17. dxe4 {0-1 (36) Wang,H (2730)-Carlsen,M (2835) St Petersburg 2018}) 11. Nh2 Nf8 {White has an edge.} 12. f4 exf4 13. Bxf4 g5 14. Bg3 Ng6 15. e5 Be6 (15... Nxe5 $11 16. Rae1 O-O) 16. Rae1 O-O-O 17. Nf3 Kb8 $146 18. Ne4 Ka8 19. Qc3 (19. Qe3 $16) 19... Rd5 $14 20. a3 g4 21. hxg4 Bxg4 22. Nf6 Bxf6 $1 23. exf6 Qd7 (23... Qf8 $11 {keeps the balance.}) 24. Nh4 $1 $36 {[%cal Rh4g6][%mdl 2048] And now Nxg6 would win. White is in control.} Nxh4 25. Re7 ({But not} 25. Bxh4 $6 Be6 $11) 25... Qc8 {...Nf5 is the strong threat.} 26. Bxh4 Be6 {[#]} (26... Bh5 $16) 27. Re1 $1 $18 Rf5 $2 {[#]} (27... Rd6 {is a better chance.} 28. Qxc5 Rd5) 28. R1xe6 $1 {[%mdl 512] White is clearly winning.} fxe6 {[#]} (28... Qxe6 29. Rxe6) 29. f7 $1 {Threatening mate with Qxh8!} e5 30. Qxc5 {Strongly threatening Bf2.} b6 31. Qd6 {Accuracy: White = 70%, Black = 40%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.07"]
[Round "2.3"]
[White "Bartel, Mateusz"]
[Black "Shirov, Alexei"]
[Result "0-1"]
[ECO "C77"]
[WhiteElo "2600"]
[BlackElo "2667"]
[Annotator "TA"]
[PlyCount "62"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,62,3,5,0,10,4,1,20,8,7,20,-25,-4,-14,-12,-24,-12,-13,-2,-2,-6,-4,-10,-6,-15,-27,-39,-32,-24,-44,-16,-59,-65,-63,-58,-51,-52,-155,-145,-109,-112,-129,-141,-223,-212,-274,-275,-608,-615,-744,-744,-1273,-1229]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Nc3 Be7 6. d3 d6 7. a3 {C77: Ruy Lopez: 3...a6 4 Ba4 Nf6, unusual lines} (7. Bxc6+ bxc6 8. d4 exd4 9. Nxd4 Bd7 10. Qf3 c5 11. Nf5 Bxf5 12. Qxf5 Qd7 13. Qxd7+ Kxd7 14. Bf4 Rhe8 {½-½ (46) Horvath,A (2481)-Horvath,D (2429) Budapest 2018}) 7... O-O 8. h3 Nd4 $146 ({Predecessor:} 8... h6 9. Bb3 Be6 10. Nd5 Bxd5 11. exd5 Nb8 12. Be3 Nbd7 13. Ba2 Re8 14. O-O Bf8 {0-1 (41) Gonen,M (1634)-Hanci,I (1615) Antalya 2019}) 9. Nxd4 {The position is equal.} exd4 10. Ne2 d5 11. exd5 (11. e5 $5 {[%cal Re5f6]} Nd7 12. Bxd7 Bxd7 13. Nxd4 $11) 11... Nxd5 12. O-O c5 13. Bb3 Be6 14. Re1 Bd6 15. Ng3 Bxg3 16. fxg3 b5 {[%cal Bb7b5,Bb5c4,Bc4c3][%mdl 32]} 17. Qf3 Rc8 18. Kh2 c4 19. Ba2 h6 20. dxc4 bxc4 21. Rd1 Qb6 22. Qf2 Ne3 $36 {[%mdl 2048] Black has good play.} 23. Re1 c3 24. b4 (24. b3 $15) 24... Bxa2 $17 25. Rxa2 {[%cal Rc1e3]} Rfe8 {aiming for ...Qe6.} 26. Bxe3 dxe3 ({Resist} 26... Rxe3 27. Raa1 $15) 27. Qf3 {[#]} (27. Qf1 $17) 27... Rc6 $1 $19 {[%cal Bc8c6,Bc6f6,Bf6f2][%mdl 32]} 28. Raa1 Rf6 29. Qg4 $2 (29. Qe2 Qc6 30. Rf1) 29... Rf2 {Black is clearly winning.} 30. Re2 Qb5 31. Rae1 h5 {Accuracy: White = 43%, Black = 73%.} 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.07"]
[Round "2.4"]
[White "Nguyen, Thai Dai Van"]
[Black "Paravyan, David"]
[Result "1-0"]
[ECO "C65"]
[WhiteElo "2546"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "65"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,65,31,27,50,44,44,33,33,0,0,0,0,0,10,8,60,65,44,29,205,205,209,193,302,297,320,313,302,297,336,277,262,237,328,292,555,417,1082,1069,949,923,1386,1340,29990,29991,29991,29992]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Bc5 5. O-O d6 6. c3 O-O 7. h3 a6 {C65: Ruy Lopez: Berlin Defence (3...Nf6), unusual lines and 4 0-0 Bc5} 8. Bxc6 bxc6 9. d4 Bb6 10. Re1 exd4 11. cxd4 {LiveBook: 3 Games} d5 12. e5 Ne4 13. Nc3 $146 ({Predecessor:} 13. Be3 f6 14. Nbd2 f5 15. Nb3 {½-½ (63) Karjakin,S (2785)-Jakovenko,D (2722) Moscow 2012}) 13... c5 14. Be3 Nxc3 15. bxc3 c4 16. Qc2 Qd7 17. g4 Qe7 (17... Qe6 $11) 18. Ng5 $40 {[%csl Gg5][%cal Rc2h7][%mdl 128] White attacks.} g6 19. Nf3 f5 $2 {[#]} (19... Be6 $11 {and Black has nothing to worry.}) 20. exf6 $1 $18 Qxf6 21. Ne5 Be6 (21... c6 {is a better defense.} 22. Bh6 Rd8) 22. Qd2 Rfe8 23. Re2 c6 24. Bg5 Qf8 25. Nxc6 Rac8 26. Ne5 Ba5 27. Rae1 Qa3 $2 (27... Qg7 {keeps fighting.} 28. Qc1 Bc7 29. Nxc4 Qf7) 28. Re3 Rb8 (28... Qd6 $142 29. Bh6 Bc7) 29. Nc6 Rb2 30. Qc1 Qxa2 31. Rf3 ({Inferior is} 31. Rxe6 Rxe6 32. Rxe6 Rb1 $11) 31... Bxc3 {[#]} 32. Qf4 $1 {[%mdl 512]} Qa3 {[#]} 33. Rxe6 $1 {[%mdl 512] Precision: White = 85%, Black = 35%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.07"]
[Round "2.5"]
[White "Stocek, Jiri"]
[Black "Praggnanandhaa R"]
[Result "1/2-1/2"]
[ECO "A21"]
[WhiteElo "2592"]
[BlackElo "2532"]
[Annotator "TA"]
[PlyCount "105"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,105,22,21,20,13,15,11,14,31,33,29,33,26,29,35,20,33,10,27,20,22,15,15,20,21,12,10,8,22,-18,37,36,60,89,87,53,66,76,123,72,111,99,142,139,189,170,179,64,55,37,62,0,0,-88,-79,-89,-87,-93,-85,-82,-54,-62,-62,-66,-47,-51,0,-8,-8,-8,-8,-8,0,-8,-8,-8,-8,-8,-8,-8,-8,-8,-8,-8,0,0,8,8,8,8,8,8,8,8,8,0,0,0]} 1. c4 e5 2. Nc3 Bb4 3. Nd5 Bc5 4. Nf3 c6 5. Nc3 d6 6. e3 {A21: English Opening: 1...e5 2 Nc3} Bb4 7. d4 e4 8. Nd2 Bxc3 9. bxc3 Nf6 10. Ba3 O-O 11. c5 d5 12. Be2 Re8 13. O-O $146 b6 14. c4 Ba6 15. cxb6 axb6 16. Qb3 Nbd7 17. Rfc1 dxc4 18. Nxc4 Re6 19. f4 c5 (19... exf3 $11 20. Bxf3 Nd5) 20. dxc5 $14 Nxc5 21. Bxc5 bxc5 22. a4 Rb8 23. Rd1 Qc7 {[#]} 24. Qc2 (24. Qa2 $142 $1) 24... h5 25. a5 Rb4 26. h3 h4 27. Nb6 c4 {[#]} 28. Qc3 ({White should try} 28. Rd4 $1 $18) 28... Rb3 29. Qd4 {[%cal Re2c4]} Rc6 30. Rac1 ({Better is} 30. Kh2 $14) 30... Ra3 $11 31. Qd8+ (31. Qe5 $11 {keeps the balance.} Qxe5 32. fxe5 Rxa5 33. Rd6 Rxb6 34. Rxb6) 31... Qxd8 $17 32. Rxd8+ Kh7 33. Nd7 Nxd7 34. Rxd7 Rxe3 35. Kf2 Ra3 36. Rxf7 e3+ 37. Kf3 Rg6 ({Black should play} 37... Rxa5 $15 38. Bd1 Ra3) 38. g4 $132 {[%mdl 2048] The position is equal. White is not holding back} hxg3 {And now ...g2 would win.} 39. f5 Rc6 40. Kxg3 Rxa5 41. Kf4 {Black should prevent Rg1.} Rf6 42. Rxf6 gxf6 $11 {[%mdl 4096] Endgame KRB-KRB} 43. Rc3 Re5 44. Rxe3 Rxe3 45. Kxe3 {KB-KB} Kh6 46. h4 Bc8 47. Bg4 Bxf5 48. Bxf5 {KB-KPP} Kh5 (48... Kg7 {seems wilder.} 49. Kd4 Kh6 50. Kc3 Kg7 51. h5 Kh6) 49. Kd4 Kxh4 50. Kxc4 {Bc2 is the strong threat.} Kg5 51. Bc2 {aiming for Kd4.} f5 52. Bxf5 Kxf5 53. Kd4 {Accuracy: White = 59%, Black = 53%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.08"]
[Round "3.1"]
[White "Paravyan, David"]
[Black "Ju, Wenjun"]
[Result "0-1"]
[ECO "C42"]
[WhiteElo "2627"]
[BlackElo "2580"]
[Annotator "TA"]
[PlyCount "88"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 17,88,29,41,23,21,15,27,16,37,25,39,16,29,9,14,18,12,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-39,-39,-39,-27,-40,-48,-56,-50,-93,-96,-133,-160,-287,-274,-272,-260,-327,-327,-282,-227,-357,-283,-416,-429,-503,-512,-548,-542,-639,-614,-816,-802,-785,-838,-814,-791,-5803,-5816,-5185,-5277]} 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bf5 7. O-O Be7 8. Re1 Nc6 9. c4 O-O 10. Nc3 {C42: Petroff Defence: 3 Nxe5 and unusual White 3rd moves} (10. cxd5 {feels hotter.} Qxd5 11. Nc3 Nxc3 12. bxc3 Rfe8 13. Bf4) 10... Nxc3 11. bxc3 Bxd3 12. Qxd3 {White has an edge.} Re8 (12... dxc4 13. Qxc4 Qd7 14. d5 Na5 15. Qd3 Rae8 16. Bd2 b6 17. Ne5 Qc8 {½-½ (28) Kobalia,M (2620)-Zvjaginsev,V (2642) Tula 2019}) 13. cxd5 Qxd5 14. Bf4 Bd6 15. Ng5 g6 16. Ne4 {[#] Strongly threatening Nf6+.} Re6 $146 ({Predecessor:} 16... Kg7 17. Qf3 Bxf4 18. Qxf4 {½-½ (48) Iljiushenok,I (2516)-Iljin,A (2528) Sochi 2018}) 17. Qf3 {aiming for Nf6+!} (17. Nxd6 {looks sharper.} cxd6 18. Rxe6 fxe6 19. Rb1 Na5 20. a4) 17... Kg7 $1 {Threatens to win with ...Rae8.} 18. Nxd6 Qxf3 19. gxf3 cxd6 20. Rxe6 fxe6 21. Bxd6 $11 {[%mdl 4096] Endgame KRB-KRN} Rd8 22. Bg3 Rc8 23. c4 Rd8 24. Rb1 Rd7 25. Be5+ Nxe5 26. dxe5 $15 {KR-KR} g5 27. Kf1 Kg6 {[%mdl 1024] Black has compensation.} 28. Ke2 Kf5 29. Rb5 b6 30. a4 {[#]} Rc7 $1 31. a5 {[#]} (31. Kd3 $17 {is a better defense.}) 31... Rc5 $1 $19 {[%cal Rc5b5] Hoping for ...Rxb5.} ({Less strong is} 31... Rxc4 32. axb6 axb6 33. Kf1 $17) 32. Rb1 Rxe5+ 33. Kf1 Rxa5 34. Rd1 Ra4 35. Rd7 (35. Rc1 {was the only chance.}) 35... a5 {[%cal Ba7a5,Ba5a4][%mdl 32]} (35... Rxc4 $2 36. Rxa7 h6 37. Rf7+ Kg6 38. Rb7 $17) 36. Rc7 (36. Rb7 $142) 36... Ke5 37. c5 {Black is clearly winning.} b5 38. Rxh7 Rc4 39. f4+ Kxf4 40. h4 a4 41. c6 Rxc6 42. h5 Kg4 43. Kg2 Ra6 44. f3+ Kh4 {Accuracy: White = 32%, Black = 86%.} 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.08"]
[Round "3.2"]
[White "Praggnanandhaa R"]
[Black "Nguyen, Thai Dai Van"]
[Result "1/2-1/2"]
[ECO "C42"]
[WhiteElo "2532"]
[BlackElo "2546"]
[Annotator "TA"]
[PlyCount "120"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 17,120,33,39,19,24,20,16,17,36,22,27,33,20,14,17,14,16,19,19,19,20,0,23,9,16,29,14,22,22,0,19,19,45,46,46,32,77,70,77,77,73,73,74,71,90,108,102,91,91,83,83,91,91,91,91,67,91,41,41,41,49,14,14,14,91,91,91,91,91,0,0,0,91,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,8,0,0,0,0,0,0,0,0,0,8,93,93,93,93,93,242]} 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. d4 d5 6. Bd3 Bf5 7. O-O Be7 8. Re1 O-O 9. c4 Nc6 10. cxd5 {C42: Petroff Defence: 3 Nxe5 and unusual White 3rd moves} Qxd5 11. Nc3 Nxc3 12. bxc3 {The position is equal.} Bxd3 13. Qxd3 Rfe8 14. Bf4 Bd6 15. c4 Qh5 16. Bg3 {[#]} b6 $146 ({Predecessor:} 16... Bxg3 17. hxg3 {1-0 (59) Lagno,K (2547)-Ju,W (2567) Huaian 2017}) 17. Bxd6 cxd6 18. Qa3 Qg6 19. Rxe8+ Rxe8 20. Qa4 Rc8 $1 21. d5 Na5 $1 22. Qd7 {[%cal Rd7c8]} Rf8 23. Qc7 Qf6 24. Re1 Qd8 25. Qxa7 Nxc4 26. Qa4 $36 {[%mdl 2048] White has the initiative.} Ne5 27. Nxe5 dxe5 28. Rxe5 $16 {[%mdl 4096] Endgame KQR-KQR} f6 {[#]} 29. Re6 $1 Qxd5 30. Rxb6 Ra8 {[#]} 31. Ra6 $1 {[%cal Ra6a8]} Rd8 {( -> ...Qd1+)} 32. h4 Qd1+ 33. Kh2 Qxa4 34. Rxa4 {KR-KR} h5 35. Ra5 Kf7 36. g3 Rd3 37. Kg2 Kg6 38. a4 {[%cal Ba2a4,Ba4a5,Ba5a6][%mdl 32]} Ra3 39. Ra8 Kf5 40. a5 Ra2 (40... Ra4 $11 {keeps the balance.}) 41. a6 Kg4 42. Ra7 Kf5 43. Kf1 (43. Re7 $16) 43... Kg4 $11 44. Kg2 (44. Re7 $11) 44... Kf5 $1 $16 45. Kf3 ({Better is} 45. Rxg7 $16 {And now a7 would win.} Rxa6 46. Rd7) 45... g5 $11 46. hxg5 fxg5 47. Ra8 Kg6 48. Ke4 Kg7 49. Kf3 Ra3+ 50. Kg2 Ra2 51. Kg1 {Threatens to win with a7.} Ra1+ 52. Kg2 Ra2 53. a7 g4 54. Kf1 Ra1+ 55. Ke2 Ra3 56. Kd2 {Black must now prevent Kc2.} Ra2+ 57. Ke3 {Kd4 is the strong threat.} Kh7 58. Kf4 {Hoping for Ke5.} Rxf2+ {White is better.} 59. Kg5 {White wants to mate with Rc8.} Ra2 60. Kxh5 Ra4 {Accuracy: White = 63%, Black = 70%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.08"]
[Round "3.3"]
[White "Michalik, Peter"]
[Black "Anton Guijarro, David"]
[Result "1-0"]
[ECO "D37"]
[WhiteElo "2565"]
[BlackElo "2643"]
[Annotator "TA"]
[PlyCount "133"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,133,15,39,32,36,44,41,48,47,33,43,34,45,27,27,21,42,28,41,35,41,25,47,47,49,46,54,49,63,65,192,197,190,191,237,247,243,239,283,282,264,271,349,343,335,350,364,358,358,337,586,277,351,356,353,355,329,174,302,234,237,225,227,228,227,230,215,168,164,132,133,131,156,162,147,152,212,193,184,187,173,181,165,161,210,188,206,19,19,19,18,18,22,22,22,20,212,193,275,268,262,220,220,220,220,195,195,180,751,751,713,713,1524,1489,1027,861,29967,29968,29962,29961,29975,29975,29975,29975,29973,29969]} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 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 O-O 10. Qd2 Nc6 11. Qf4 Rb8 {Threatens to win with ...Nd5.} 12. Nc3 Kh8 $146 ({Predecessor:} 12... f5 13. Qg3 {1-0 (38) Ding,L (2804)-Duda,J (2739) Batumi 2018}) 13. Rd1 Nb4 14. Qg4 N4d5 15. Qh5 Bb7 16. Ng5 Bxg5 $1 17. Bxg5 f6 18. Bd2 $40 {[%mdl 128] White attacks.} Nb4 19. Qh4 f5 ({Better is} 19... fxe5 $14 20. Bg5 Qe8) 20. Bg5 $18 Qd7 21. Be7 $1 {[%cal Re7b4]} a5 22. Bxf8 Rxf8 23. d5 exd5 24. Bxc4 Qe6 25. Bb3 c5 26. a3 Na6 27. Ne2 c4 28. Nf4 Qe8 29. Bc2 Nc5 $2 {[#]} (29... Kg8 {might work better.} 30. g4 Nc7) 30. Rd4 (30. Bxf5 $142 $1 {[%mdl 512]} Rxf5 31. Ng6+ $1 {[%mdl 576] Pin} Kg8 32. Ne7+ {[%mdl 64] Double Attack} Kh8 33. Ng6+ Kg8 34. Ne7+ {[%mdl 64] Double Attack} Kh8 35. Nxf5) 30... Kg8 31. Re1 Ne4 32. f3 Qxe5 {[#]} 33. Ne2 (33. Rd2 $142 $3 {[%mdl 512]}) 33... Nd6 (33... Nc5 {keeps fighting.} 34. Rdd1 Qf6) 34. Nc3 Qf6 35. Qxf6 Rxf6 36. b3 Kf7 37. Kf2 g6 38. h4 Bc6 39. Rc1 Ke6 40. a4 Rf8 41. Re1+ Kd7 42. Red1 Rb8 (42... Ke6 $16 43. Re1+ Kd7) 43. Kg3 Re8 44. bxc4 Ndxc4 45. Bb3 {And now Bxc4 would win.} Ne3 46. Rc1 Kd6 47. Rd3 Nd7 {[#]} 48. Kf2 $2 (48. Ne2 $1 $18) 48... Nc5 $11 {[%mdl 64] Double Attack} 49. Rxe3 Rxe3 50. Kxe3 d4+ $1 51. Ke2 {Nb5+ is the strong threat.} Nxb3 52. Rb1 dxc3 $2 (52... Nc5 $11 {and Black is okay.} 53. Rd1 Nb3) 53. Rxb3 {[%mdl 4096] Endgame KR-KB} c2 (53... Bxa4 {is a better defense.} 54. Rxc3 Bb5+ 55. Kd2 Bc6) 54. Kd2 $18 Bxa4 55. Ra3 Bb5 56. Rxa5 Bf1 57. g3 Be2 58. Ra3 Kd5 $2 (58... Bd1 59. Ra7 h5) 59. Kxc2 Kd4 60. Kd2 Bc4 61. Ra7 Bd5 62. Ke2 f4 63. gxf4 {White mates.} Bc4+ 64. Kf2 h5 65. Rd7+ Kc5 {[#]} 66. f5 $1 gxf5 67. Ke3 {Accuracy: White = 70%, Black = 45%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.08"]
[Round "3.4"]
[White "Shirov, Alexei"]
[Black "Stocek, Jiri"]
[Result "0-1"]
[ECO "C02"]
[WhiteElo "2667"]
[BlackElo "2592"]
[Annotator "TA"]
[PlyCount "80"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,80,12,-4,25,-12,0,0,0,7,18,0,0,0,18,28,18,26,52,35,50,16,116,-24,0,0,16,0,4,-29,-14,-115,-101,-122,-112,-127,-50,-179,-168,-171,-175,-253,-248,-364,-382,-375,-369,-364,-370,-339,-323,-331,-268,-328,-322,-277,-218,-303,-279,-539,-535,-1820,-1773,-1661,-427,-1541,-1395,-6078,-6070,-4133,-1659]} 1. e4 e6 2. d4 d5 3. e5 c5 4. c3 Nc6 5. Nf3 Bd7 6. Be2 f6 7. O-O fxe5 {C02: French: Advance Variation} 8. dxe5 Nh6 9. c4 d4 {The position is equal.} 10. b4 cxb4 $146 ({Predecessor:} 10... Nf7 11. bxc5 Bxc5 12. Bf4 Qe7 13. Nbd2 g5 14. Bg3 h5 15. h3 {½-½ (50) Yu,L (2417)-Nguyen,N (2662) Beijing 2012}) 11. Bd3 Nf7 12. Re1 Be7 13. Nbd2 Qc7 {[%cal Rf7e5]} 14. Nb3 O-O-O {[%cal Rf7e5]} 15. a3 (15. Nfxd4 $6 Nxd4 16. Nxd4 Nxe5 $11) 15... Kb8 16. axb4 Nxb4 (16... Bxb4 $11 17. Bd2 Bc3 18. Bxc3 dxc3) 17. Nfxd4 (17. Bb2 $16) 17... Nxe5 18. Bf1 Rhf8 19. Be3 {aiming for Rxa7!} a6 20. Qh5 (20. c5 $5) 20... g6 21. Qe2 (21. Qd1 $11 {keeps the balance.}) 21... Ned3 $17 {Threatens to win with ...e5.} 22. Red1 e5 (22... Qxc4 23. Nc1 $14 (23. Rxd3 Qxd3 24. Qxd3 Nxd3 $11)) 23. Nc2 e4 (23... Nf4 $17 24. Bxf4 Rxf4) 24. c5 (24. Nxb4 $1 $15 Bxb4 25. g3) 24... Nd5 $36 {[%mdl 2048] Black is really pushing.} ({Avoid the trap} 24... Nxc5 $2 25. Nxb4 Nxb3 {[#]} 26. Nxa6+ $1 {[%mdl 512]} bxa6 27. Qxa6 $18) 25. Bd4 Bf6 (25... Bxc5 26. Nxc5 Nxc5 27. Qc4 $16) 26. Qxe4 (26. Bxf6 {is a better defense.} Nxf6 27. Ne3) 26... Bf5 27. Qf3 (27. Qe2 $142 Bxd4 28. Ncxd4) 27... Ne5 28. Bxe5 Bxe5 29. Ncd4 {[#]} Bc2 $1 {[%mdl 512]} 30. Qh3 (30. Nxc2 Bxh2+) 30... Bxd1 31. Rxd1 Bxd4 ({Don't do} 31... Qf7 32. Rd2 $19) 32. Nxd4 Qf4 ({Weaker is} 32... Qxc5 33. Qg3+ Ka7 34. Ne6 $15) 33. Nf3 g5 34. Rd4 Qc1 {White must now prevent ...Nf4.} 35. Qxh7 $2 {[#]} (35. Qe6 {was forced.} Rfe8 36. Qf5) 35... Ne3 $1 {[%csl Ge3][%cal Rc1f1][%mdl 512] Black is clearly winning.} 36. Rxd8+ (36. fxe3 Qxe3+) 36... Rxd8 {[%csl Ge3][%cal Rc1f1]} 37. fxe3 Qxe3+ 38. Kh1 Rd1 39. Qh8+ Ka7 40. Nd2 Qxd2 {Accuracy: White = 35%, Black = 60%.} 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.08"]
[Round "3.5"]
[White "Krejci, Jan"]
[Black "Bartel, Mateusz"]
[Result "1-0"]
[ECO "E16"]
[WhiteElo "2570"]
[BlackElo "2600"]
[Annotator "TA"]
[PlyCount "67"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 14,67,25,8,29,23,28,4,29,22,35,18,42,35,62,44,58,59,66,69,53,39,94,96,100,77,108,88,104,90,106,84,87,85,72,72,89,76,67,73,110,111,177,185,189,192,185,177,338,345,466,443,431,429,423,414]} 1. d4 Nf6 2. c4 e6 3. g3 Bb4+ 4. Bd2 a5 5. Bg2 O-O 6. Nf3 b6 7. O-O Bb7 8. Nc3 Bxc3 {E16: Queen's Indian: 4 g3 Bb7 5 Bg2 Bb4+} 9. Bxc3 Be4 10. e3 $146 ({Predecessor:} 10. b3) 10... d6 {The position is equal.} 11. Qe2 Nbd7 12. Rfd1 Qb8 13. Bf1 Qb7 14. Ne1 d5 15. f3 Bg6 16. Rac1 c6 17. g4 Ne8 (17... dxc4 $14 18. Qxc4 b5) 18. Ng2 $16 Nd6 19. cxd5 exd5 20. Be1 Rfd8 21. Bg3 Nf8 22. Nf4 h6 23. e4 (23. Bg2 {keeps more tension.} Bh7 24. e4 a4 25. Re1 Nb5 26. exd5 Nxd4 27. Qc4) 23... dxe4 24. Nxg6 Nxg6 25. fxe4 Ne8 26. Bg2 Nf6 27. d5 cxd5 (27... Rac8 $16) 28. Rc7 $36 {[%mdl 2048] Keeping Black busy.} Qa6 29. Qxa6 Rxa6 30. exd5 Nxg4 $2 {[#]} (30... b5 {is a better defense.} 31. Bf3 b4) 31. d6 $1 {[%cal Rd6d7]} N4e5 32. d7 {White is clearly winning.} Kf8 33. Be4 b5 34. Rd5 {Accuracy: White = 73%, Black = 40%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.09"]
[Round "4.1"]
[White "Ju, Wenjun"]
[Black "Anton Guijarro, David"]
[Result "1/2-1/2"]
[ECO "C72"]
[WhiteElo "2580"]
[BlackElo "2643"]
[Annotator "TA"]
[PlyCount "74"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 18,74,29,29,37,17,24,7,12,2,0,9,4,0,0,0,0,0,0,-11,-13,-19,-14,-12,-13,-23,-12,-12,-8,-8,-16,-12,0,0,0,0,0,0,0,0,0,0,0,0,0,0,29,30,43,34,17,0,10,11,27,0,0,0,0]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 d6 5. O-O Bd7 6. d4 exd4 7. Nxd4 b5 8. Nxc6 Bxc6 9. Bb3 Nf6 10. Nc3 Be7 {C72: Ruy Lopez: Deferred Steinitz: 5 0-0} 11. Re1 (11. f3 {keeps more tension.} O-O 12. Be3 Nd7 13. Nd5 Re8 14. Qd2) 11... O-O 12. Nd5 (12. a3 Re8 13. Qf3 a5 14. Bd2 Rb8 15. g4 {1-0 (58) Wang,H (2709)-Fressinet,L (2662) Riadh 2017}) 12... Nxd5 13. Bxd5 Qd7 14. c3 Bf6 15. Bf4 Rfe8 16. Qd2 $146 ({Predecessor:} 16. Bg3 Rad8 17. h3 Bxd5 18. Qxd5 c6 19. Qd3 Qe6 20. f3 g6 21. Kh1 Qe7 {½-½ (21) Habada,J (1915)-Ling,B (2050) Ostrava 2007}) 16... Rab8 17. a3 a5 18. Rad1 Bxd5 19. exd5 Qf5 20. h3 h5 21. Re3 Rxe3 22. Bxe3 g6 23. Qd3 Qxd3 24. Rxd3 $11 {[%mdl 4096] Endgame KRB-KRB} Kg7 25. f4 h4 26. Kf2 Kf8 27. Kf3 Ke7 28. Kg4 Rh8 29. f5 g5 30. Rd1 ({But not} 30. Bxg5 $2 Rg8 $19) 30... Rg8 31. Rf1 b4 32. axb4 axb4 33. cxb4 Bxb2 34. b5 f6 35. Rb1 Be5 36. b6 cxb6 37. Rxb6 {[#] Black must now prevent Rb7+.} Rc8 {Accuracy: White = 76%, Black = 84%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.09"]
[Round "4.2"]
[White "Bartel, Mateusz"]
[Black "Michalik, Peter"]
[Result "1/2-1/2"]
[ECO "C67"]
[WhiteElo "2600"]
[BlackElo "2565"]
[Annotator "ChessBase"]
[PlyCount "97"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "40/5400+30:1800+30"]

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 0:00:00]} Nxe4 {[%emt 0:00:00]} 5. Re1 {[%emt 0:00:00]} Nd6 {[%emt 0:00:00]} 6. Nxe5 {[%emt 0:00:00]} Nxe5 {[%emt 0:00:13]} 7. Rxe5+ {[%emt 0:00:08]} Be7 {[%emt 0:00:05]} 8. Bf1 {[%emt 0:00:05]} O-O {[%emt 0:00:06]} 9. d4 {[%emt 0:00:05]} Bf6 {[%emt 0:00:17]} 10. Re1 {[%emt 0:00:05]} Re8 {[%emt 0:01:21]} 11. Rxe8+ {[%emt 0:00:08]} Nxe8 {[%emt 0:00:24]} 12. d5 {[%emt 0:00:05]} d6 {[%emt 0:03:10]} 13. Nd2 {[%emt 0:00:04]} Be7 {[%emt 0:02:07]} 14. Nc4 {[%emt 0:12:19]} Nf6 {[%emt 0:05:47]} 15. Bf4 {[%emt 0:00:20]} Bf5 {[%emt 0:02:29]} 16. Ne3 {[%emt 0:13:33]} Bg6 {[%emt 0:00:24]} 17. Be2 {[%emt 0:00:38]} Nd7 {[%emt 0:08:56]} 18. c3 {[%emt 0:03:13]} Nc5 {[%emt 0:03:54]} 19. g3 {[%emt 0:06:16]} a5 {[%emt 0:02:22]} 20. h4 {[%emt 0:01:28]} h6 {[%emt 0:00:05]} 21. Ng4 {[%emt 0:04:11]} Qd7 {[%emt 0:04:20]} 22. Be3 {[%emt 0:03:56]} Ne4 {[%emt 0:14:05]} 23. a4 {[%emt 0:10:55]} Nf6 {[%emt 0:03:33]} 24. Bd4 {[%emt 0:09:05]} Nxg4 {[%emt 0:10:50]} 25. Bxg4 {[%emt 0:00:00]} Bf5 {[%emt 0:00:04]} 26. Bxf5 {[%emt 0:00:32]} Qxf5 {[%emt 0:00:06]} 27. Qe2 {[%emt 0:00:04]} Qd7 {[%emt 0:08:07]} 28. Re1 {[%emt 0:01:55]} Bf8 {[%emt 0:00:06]} 29. b3 {[%emt 0:03:04]} c5 {[%emt 0:01:09]} 30. Be3 {[%emt 0:03:02]} Qf5 {[%emt 0:03:37]} 31. c4 {[%emt 0:00:28]} Re8 {[%emt 0:00:49]} 32. Kg2 {[%emt 0:00:06]} h5 {[%emt 0:05:42]} 33. Qf3 {[%emt 0:00:13]} Qxf3+ {[%emt 0:00:22]} 34. Kxf3 {[%emt 0:00:02]} b6 {[%emt 0:01:13]} 35. g4 {[%emt 0:04:05]} hxg4+ {[%emt 0:00:14]} 36. Kxg4 {[%emt 0:00:04]} Re4+ {[%emt 0:00:50]} 37. f4 {[%emt 0:00:32]} g6 {[%emt 0:05:20]} 38. h5 {[%emt 0:10:06]} Bg7 {[%emt 0:00:25]} 39. hxg6 {[%emt 0:10:18]} fxg6 {[%emt 0:00:17]} 40. Bf2 {[%emt 0:00:00]} Rxe1 {[%emt 0:00:00]} 41. Bxe1 {[%emt 0:00:16]} Bf6 {[%emt 0:07:08]} 42. f5 {[%emt 0:00:47]} gxf5+ {[%emt 0:00:44]} 43. Kxf5 {[%emt 0:00:09]} Kf7 {[%emt 0:00:02]} 44. Bg3 {[%emt 0:00:26]} Be7 {[%emt 0:00:03]} 45. Bf4 {[%emt 0:00:42]} Bf8 {[%emt 0:00:04]} 46. Bg5 {[%emt 0:00:19]} Bg7 {[%emt 0:00:05]} 47. Bd8 {[%emt 0:03:20]} Bc3 {[%emt 0:00:05]} 48. Bxb6 {[%emt 0:00:06]} Ke7 {[%emt 0:00:03]} 49. Ke4 {[%emt 0:00:31]} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.09"]
[Round "4.3"]
[White "Nguyen, Thai Dai Van"]
[Black "Shirov, Alexei"]
[Result "1/2-1/2"]
[ECO "C78"]
[WhiteElo "2546"]
[BlackElo "2667"]
[Annotator "TA"]
[PlyCount "115"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 17,115,32,45,0,0,0,0,0,10,26,7,6,0,0,0,0,20,23,38,29,27,12,28,21,28,21,27,25,20,0,0,0,0,0,-9,-56,-19,-25,-33,-16,0,0,0,0,0,0,53,56,58,58,55,53,75,75,75,75,75,75,99,99,99,99,99,99,99,99,99,99,99,99,99,99,99,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Bc5 7. a4 Rb8 8. c3 d6 9. d4 Bb6 10. a5 {C78: Ruy Lopez: Archangelsk and Möller Defences} Ba7 $1 11. h3 O-O 12. Be3 Ra8 13. Nbd2 h6 {[#]} 14. Qe2 $146 ({Predecessor:} 14. Re1 Re8 15. Qc2 exd4 16. Nxd4 Nxd4 17. cxd4 c5 {1-0 (63) Saric,I (2689)-Maghsoodloo,P (2649) Batumi 2018}) 14... exd4 15. cxd4 Re8 16. Rfd1 Qe7 17. d5 Nb4 18. Bxa7 Rxa7 19. Nd4 Bd7 (19... Nxe4 $2 20. Nxe4 Qxe4 21. Qd2 $18) 20. Qe3 {[#] Black must now prevent Qc3.} c5 $1 {[%cal Rf6e4]} ({Avoid the trap} 20... Nxe4 $2 21. Re1 $18) 21. dxc6 Nxc6 22. Rdc1 Ne5 23. Nf1 {[%cal Bd2f1,Bf1g3,Bg3f5][%mdl 32]} Rb7 24. Ng3 Nc4 25. Bxc4 bxc4 26. Ndf5 Bxf5 (26... Qe5 {feels hotter.} 27. Rxc4 d5 28. Rc5 Rxb2 29. Nd4 Qb8) 27. Nxf5 Qe5 28. Rxc4 Rxb2 {...d5 is the strong threat.} ({Reject} 28... Nxe4 $6 {[#]} 29. Rxe4 $1 {[%mdl 512]} (29. Qxe4 Qxe4 30. Rxe4 Rxe4 $16) 29... Qxe4 30. Qxe4 $16 (30. Nxd6 Qxe3 31. fxe3 Reb8 $14)) 29. Qg3 $36 {[%mdl 2048] White fights for an advantage.} Qxg3 30. Nxg3 Re5 31. Rd4 Rbb5 (31... Ne8 $11) 32. Rxd6 $14 Rxa5 33. Rxa5 Rxa5 {[%mdl 4096] Endgame KRN-KRN} 34. f3 Nh5 35. Nxh5 Rxh5 36. Rxa6 $16 {KR-KR} Rb5 37. h4 g6 38. g4 Rb2 39. Ra5 Kg7 40. Rd5 Kf6 41. h5 g5 42. Rd6+ Kg7 43. Kf1 Ra2 44. Ke1 (44. Rb6 {is more complex.} Rc2 45. Ra6 Rb2 46. Ra7 Rb3 47. Kf2) 44... Rb2 45. Rd2 (45. Ra6 $16) 45... Rxd2 $1 $11 {The position is equal.} 46. Kxd2 {KP-KP} Kf6 47. Kd3 Ke5 48. Ke3 f6 49. Ke2 Kf4 50. Kf2 Ke5 51. Ke3 Ke6 52. f4 gxf4+ 53. Kxf4 {K3P-KPP} Ke7 $1 54. e5 {Hoping for Kf5.} Ke6 55. exf6 Kxf6 56. g5+ hxg5+ 57. Kg4 Kg7 58. Kxg5 {Accuracy: White = 71%, Black = 71%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.09"]
[Round "4.4"]
[White "Stocek, Jiri"]
[Black "Krejci, Jan"]
[Result "1/2-1/2"]
[ECO "E12"]
[WhiteElo "2592"]
[BlackElo "2570"]
[Annotator "TA"]
[PlyCount "62"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 24,62,0,0,13,15,10,20,47,38,45,48,82,38,43,0,0,-20,0,0,21,0,0,0,0,0,7,0,34,0,0,0,0,0,0,0,0,0,0,0,0]} 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. Bg5 Bb7 5. Nc3 Bb4 6. e3 h6 7. Bh4 g5 8. Bg3 Ne4 9. Nd2 Bxc3 10. bxc3 Nxg3 11. hxg3 d6 {E13: Queen's Indian/Nimzo-Indian hybrid: 4 Nc3 Bb7 5 Bg5 h6 6 Bh4 Bb4} 12. Rh2 (12. a4 Nd7 13. a5 Nf6 14. f3 h5 15. Bd3 g4 16. e4 gxf3 17. gxf3 Ke7 18. Rh4 Qg8 19. Nf1 {1-0 (82) Bareev,E (2643)-Bologan,V (2692) Moscow 2010}) 12... Nd7 13. Be2 {[#] LiveBook: 4 Games} c5 $146 ({Predecessor:} 13... Qf6 14. Qa4 a6 15. Bf3 O-O-O 16. Qc2 h5 17. Ke2 Bxf3+ 18. Nxf3 g4 19. Nd2 {½-½ (26) Summerscale,A (2509)-Speelman,J (2583) Torquay 2002}) 14. Bf3 Qc7 15. a4 a5 16. Rb1 O-O-O 17. Bxb7+ Qxb7 18. Qf3 f5 19. Ke2 Nf6 20. Qxb7+ (20. Rbh1 {looks sharper.} d5 21. Rxh6 Rxh6 22. Rxh6 Qg7 23. Rh1) 20... Kxb7 21. f3 Kc6 22. e4 fxe4 23. Nxe4 Nxe4 24. fxe4 $11 {[%mdl 4096] Endgame KRR-KRR} Rdf8 25. Rhh1 Rf6 26. Rhf1 Rhf8 $1 {The position is equal.} 27. Rxf6 Rxf6 28. Ke3 e5 29. d5+ Kc7 30. g4 Rf4 31. g3 Rf6 {Precision: White = 54%, Black = 51%.} ({Avoid the trap} 31... Rxg4 $2 32. Kf3 $18) 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.09"]
[Round "4.5"]
[White "Paravyan, David"]
[Black "Praggnanandhaa R"]
[Result "1/2-1/2"]
[ECO "A21"]
[WhiteElo "2627"]
[BlackElo "2532"]
[Annotator "TA"]
[PlyCount "89"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,89,22,21,19,23,18,9,21,18,16,21,-2,10,-10,27,2,41,33,46,0,16,0,91,-38,-43,-51,-58,-39,0,-20,0,-4,0,-9,89,0,143,-66,16,-39,-48,-39,-56,-56,-54,-106,0,0,0,0,0,-32,0,0,0,0,0,0,0,0,0,0,0,0,0,-186,-194,-201,-111,-100,-72,-100,-44,-49,-31,-46,0,0,0,-29,0,0]} 1. c4 e5 2. Nc3 Bb4 3. Nd5 Bc5 4. b4 Bf8 5. Bb2 c6 6. Ne3 {A21: English Opening: 1...e5 2 Nc3} d6 7. g3 Nf6 8. Bg2 Ng4 $146 ({Predecessor:} 8... Be7 9. Nf3 O-O 10. O-O Ng4 11. Qb3 a5 12. Nxg4 Bxg4 13. bxa5 {1-0 (35) Azmaiparashvili,Z (2610)-Kurajica,B (2585) San Sebastian 1992}) 9. Nxg4 Bxg4 10. d4 Nd7 11. h3 Bh5 12. Nf3 a5 13. b5 {[%cal Rd4e5]} cxb5 14. dxe5 dxe5 15. O-O bxc4 (15... f6 $1 $11) 16. Qd5 (16. g4 $16 e4 17. gxh5 exf3 18. exf3) 16... f6 $1 $15 {aiming for ...Bf7.} 17. Qxc4 Bf7 $36 {[%mdl 2048] Black has the initiative.} 18. Qe4 Nc5 19. Qe3 $1 Be7 20. Rfd1 Qc8 21. Rac1 Ra6 (21... O-O $11) 22. g4 (22. Ba3 $16 b6 23. Nxe5 fxe5 24. Qxe5) 22... b6 {[#]} (22... Bxa2 $11 23. Bxe5 fxe5 24. Qxe5 Be6 25. Qxg7 Rf8) 23. g5 $2 (23. Nxe5 $1 $16 {[%mdl 512]} fxe5 24. Qxe5) 23... Qe6 (23... Ra7 $15) 24. Kh1 (24. Nh4 $11) 24... Ra7 (24... Qxa2 $2 {[#]} 25. Nxe5 $1 {[%mdl 512]} Rg8 26. gxf6 $18) 25. gxf6 gxf6 26. Nh4 Rd7 27. f4 (27. Qf3 $15 Rxd1+ 28. Rxd1) 27... Rxd1+ (27... Qxa2 28. Rxd7 Nxd7 29. fxe5 $14) (27... e4 $17 28. Bd4 Rg8 29. Bxc5 Bxc5 30. Qxe4 Qxe4 31. Bxe4 Rxd1+ 32. Rxd1 Bxa2) 28. Rxd1 $11 {Threatens to win with f5.} e4 {And now ...Rg8 would win.} ({Don't go for} 28... Qxa2 $2 29. Bc6+ Kf8 30. fxe5 $18) 29. f5 $1 {[%cal Rf5e6]} Qxa2 30. Qf4 {Qb8+ would kill now.} Bb3 ({Don't play} 30... O-O $6 31. Rg1 $14) 31. Qb8+ {[%mdl 64] Double Attack} Kf7 32. Qxh8 Bxd1 33. Qxh7+ Ke8 34. Ng6 {[%csl Gg6][%cal Rh7e7]} Qf7 35. Qh8+ Kd7 36. Qb8 {Strongly threatening Ba3.} Bd8 37. Qa7+ $2 (37. Ba3 $11 Qd5 38. Nf8+ Ke7 39. Ne6) 37... Ke8 $19 38. Qa8 Qb7 (38... Bc2 $19 39. h4 Qb7 40. Qxb7 Nxb7) 39. Qxb7 $17 Nxb7 40. Bxe4 Nd6 ({Better is} 40... Nc5 $17 41. Bc6+ Kf7) 41. Bc6+ $15 Kf7 42. Bd5+ Ke8 43. Bc6+ Kf7 44. Bd5+ $1 Ke8 45. Bc6+ {Accuracy: White = 48%, Black = 33%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.10"]
[Round "5.1"]
[White "Praggnanandhaa, R."]
[Black "Ju, Wenjun"]
[Result "1-0"]
[ECO "C42"]
[WhiteElo "2532"]
[BlackElo "2580"]
[Annotator "TA"]
[PlyCount "113"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,113,12,6,5,20,17,27,6,15,6,6,13,20,8,10,15,39,32,37,28,35,37,35,41,61,58,60,60,62,68,64,63,69,56,54,54,49,50,70,72,83,60,60,60,54,57,78,73,91,89,91,90,102,102,110,102,100,99,93,100,92,97,204,196,206,224,199,146,195,162,196,196,196,196,196,196,196,196,275,274,273,291,297,290,313,313,375,362,377,344,313,310,302,301,29980,29980,29980,29981,29988,29984,29980,29981]} 1. e4 e5 2. Nf3 Nf6 3. Nxe5 d6 4. Nf3 Nxe4 5. Nc3 Nxc3 6. dxc3 Be7 7. Be3 O-O 8. Qd2 {C42: Petroff Defence: 3 Nxe5 and unusual White 3rd moves} Nd7 9. O-O-O c6 10. Kb1 {White has an edge.} Re8 (10... d5 11. Bd3 Nc5 12. h4 Nxd3 13. Qxd3 Qd6 14. c4 Rd8 15. cxd5 Qxd5 16. Qxd5 cxd5 17. Nd4 Bd7 18. Nb3 Bf5 19. Nd4 Bd7 20. Nb3 Bf5 21. Nd4 {½-½ (21) Aronian,L (2765)-Caruana,F (2832) London 2018}) 11. Bd3 d5 12. h4 Bc5 13. Bf4 Nf6 14. Rde1 Ne4 $146 ({Predecessor:} 14... Rxe1+ 15. Rxe1 Bd7 {½-½ (36) Cvak,R (2292)-Istomin,A (2157) ICCF email 2017}) 15. Bxe4 $1 dxe4 16. Rxe4 Be6 {[#] ...Bxa2+! is the strong threat.} 17. Qxd8 Raxd8 18. Be3 Bf8 {aiming for ...Bxa2+!} 19. b3 c5 20. Bf4 f6 21. Rhe1 Kf7 22. c4 Bd7 23. Rxe8 (23. Nd2 {is interesting.} Be7 24. R4e2 Bc6 25. f3 Rd4 26. Ne4) 23... Bxe8 24. Kc1 Bc6 25. Re3 h5 26. Ne1 Kg6 27. Bc7 Rc8 28. Bg3 Kf5 29. f3 g6 30. Kd1 b6 31. Nd3 Rd8 32. Ke2 g5 33. Kf2 Be8 34. hxg5 fxg5 35. Re5+ Kf6 36. Rd5 Be7 37. f4 Ke6 (37... Rxd5 $16 {is a better defense.} 38. cxd5 Kf5) 38. Re5+ $18 ({Don't take} 38. fxg5 $6 Rxd5 39. Nf4+ (39. cxd5+ Kxd5 40. g6 Ke6 $14) 39... Kd7 $16) 38... Kd7 39. fxg5 Bg6 40. Rd5+ (40. Kg1 $18) 40... Kc8 41. Rxd8+ Bxd8 {[%mdl 4096] Endgame KBB-KBN} 42. Bf4 h4 43. Kf3 Bf5 44. g3 hxg3 45. Kxg3 Kd7 (45... Bg6 $142 46. Kg4 a6) 46. Kh4 Ke8 47. Kh5 Kf8 48. Kh6 Kg8 49. Bd6 Kf7 50. Nf4 Bxc2 51. g6+ Kg8 52. Nd5 Be4 53. Bf4 Bxd5 $2 {[#]} (53... b5 $18 54. Nc3 Bd3 55. Nxb5 Bf6 56. Nxa7 Bb1) 54. cxd5 {White mates.} Bf6 55. d6 Kf8 56. d7 Ke7 57. Bg5 {Accuracy: White = 82%, Black = 47%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.10"]
[Round "5.2"]
[White "Michalik, Peter"]
[Black "Stocek, Jiri"]
[Result "1/2-1/2"]
[ECO "E16"]
[WhiteElo "2565"]
[BlackElo "2592"]
[Annotator "TA"]
[PlyCount "102"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 17,101,31,26,14,21,0,0,0,0,0,0,-25,-24,-19,-25,0,25,25,22,35,24,3,7,6,17,8,36,0,19,-91,-104,-120,-53,-70,-69,-118,-119,-82,0,0,0,0,0,-17,-25,-11,-17,-17,-10,-95,-87,-304,-291,-263,-51,-54,-55,-54,-54,-54,-65,-58,-18,-10,-16,-50,-25,-56,-46,-62,-11,-22,-10,-48,0,0,0,0,0,0,0,0,0,0,0,0]} 1. d4 Nf6 2. Nf3 e6 3. c4 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 a5 7. O-O O-O 8. Bf4 Be7 9. Nc3 Ne4 10. Nb5 {E16: Queen's Indian: 4 g3 Bb7 5 Bg2 Bb4+} (10. Qd3 Nxc3 11. bxc3 Qc8 12. e4 d6 13. Rfe1 a4 14. Rad1 Ra5 15. h4 Nd7 16. Nd2 Rd8 17. Nf1 h6 {0-1 (72) Sargissian,G (2689)-Predke,A (2622) St Petersburg 2018}) 10... c6 11. Nc3 Nxc3 12. bxc3 d5 13. Nd2 Nd7 {[#]} 14. Re1 $146 ({Predecessor:} 14. Rb1 a4 15. cxd5 cxd5 16. c4 g5 17. Be3 f5 18. cxd5 {1-0 (38) Bocharov,D (2576)-Samojlov,A (2329) Sochi 2017}) 14... g5 15. Be3 f5 16. f3 Qe8 17. Bf2 Qf7 18. e4 Rae8 19. e5 Rc8 20. Rb1 Rc7 21. f4 Qe8 22. Nf1 dxc4 23. Ne3 {[#]} (23. Qa4 $11) 23... b5 $1 $17 24. a4 Nb6 (24... gxf4 $17 25. gxf4 Nb6) 25. axb5 $15 cxb5 {Threatens to win with ...gxf4.} 26. d5 gxf4 {[#]} 27. Nxf5 $1 {[%mdl 512] Black must now prevent Qg4+.} Rxf5 (27... Nxd5 $17 28. Bxd5 Bxd5 29. Qg4+ {[%mdl 64] Double Attack} Qg6 30. Qxg6+ hxg6 31. Nxe7+ Rxe7) (27... exf5 28. Bxb6) 28. Bxb6 $11 Bc5+ 29. Bxc5 Rxc5 30. Qd4 Rxd5 31. Bxd5 Bxd5 32. Rf1 $1 {[%cal Rf1f4]} f3 33. Qg4+ (33. Qc5 $11 {keeps the balance.}) 33... Kh8 $17 34. Rbd1 $2 (34. Qd4 $17) 34... Qf7 $19 {Strongly threatening ...f2+.} ({Don't blunder} 34... Rxe5 $2 35. Qd4 $18) 35. Rf2 Rxe5 $2 (35... b4 $19 {aiming for ...b3.} 36. Qh4 Qf8) 36. Qd4 $1 $15 {[%cal Rd4e5]} Qf6 $1 37. Qb6 {[#]} b4 $1 38. cxb4 axb4 39. Qxb4 Re2 40. Qb6 Kg7 41. Rdf1 {And now Rxe2 would win.} Re5 42. Qc7+ Kg6 43. Qc8 h5 (43... Re3 $15) 44. h4 $11 Kh6 45. Kh2 Re4 46. Rxf3 {The position is equal.} Re2+ 47. Kh3 $1 Bxf3 {[#]} 48. Rxf3 $1 {[%mdl 512]} Qxf3 {[%cal Rf3h1]} 49. Qh8+ Kg6 {[%cal Rf3h1]} 50. Qh7+ Kf6 51. Qf7+ Kxf7 {Accuracy: White = 47%, Black = 52%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.10"]
[Round "5.3"]
[White "Krejci, Jan"]
[Black "Nguyen, Thai Dai Van"]
[Result "1-0"]
[ECO "A22"]
[WhiteElo "2570"]
[BlackElo "2546"]
[Annotator "TA"]
[PlyCount "71"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 26,71,0,0,3,-24,-17,-2,-19,-21,0,0,20,20,33,27,56,42,52,38,39,43,69,51,121,110,97,40,50,37,197,166,311,310,311,102,593,593,596,577,699,692,691,691,691,691,599,591]} 1. c4 Nf6 2. Nc3 e5 3. g3 d5 4. cxd5 Nxd5 5. Bg2 Nb6 6. d3 Be7 7. Be3 O-O 8. Rc1 Re8 9. Nf3 Nc6 10. O-O Bf8 11. Ne4 Nd4 {A29: English Opening: Four Knights Variation with 4 g3} 12. Nxd4 (12. Qd2 a5 13. Nc5 Nxf3+ 14. Bxf3 Nd5 15. a3 b6 16. Na4 Bb7 17. Rfe1 Rb8 18. Bg2 Qd7 19. Nc3 Nxe3 20. Qxe3 {½-½ (32) Anand,V (2803)-Adams,M (2744) London 2015 CBM 170 [CB]}) 12... exd4 13. Bg5 f6 14. Bd2 {LiveBook: 3 Games} Be6 {[#]} 15. a4 $146 ({Predecessor:} 15. Qc2 c6 16. b4 Bd5 17. Rfe1 f5 18. Nc5 Bxg2 19. Kxg2 {½-½ (29) Wunderlich,H (2622)-Zhak,B (2605) ICCF email 2015}) 15... Nd5 16. Nc5 Bxc5 $1 17. Rxc5 c6 18. b4 Rc8 19. Qa1 $36 {[%mdl 2048] White is pushing.} b6 20. Rc2 c5 21. bxc5 bxc5 22. Rfc1 Qd6 23. a5 {[%cal Ba4a5,Ba5a6][%mdl 32]} Nb4 24. Rb2 Bg4 ({Better is} 24... g5 $14) 25. h3 $16 Bf5 26. Bf4 ({White should try} 26. Bb7 $16 Rcd8 27. a6) 26... Qd7 $14 27. g4 Bg6 $2 {[#]} (27... Be6 $14) 28. a6 $1 $18 Re6 (28... Bxd3 $142 29. Bb7 (29. exd3 Nxd3 30. Rb7 Qe6 $14) 29... Bxe2) 29. Bb7 Rce8 30. Qa5 $2 (30. Rxc5 $18 Nxd3 {[#]} 31. Bc8 $1 {[%mdl 512]} Nxc5 32. Bxd7 Nxd7 33. Rb7) 30... Rxe2 $2 {[%mdl 8192]} (30... Rb6 $16) 31. Rxe2 {White is clearly winning.} Rxe2 32. Qxc5 Nxd3 33. Bd5+ Bf7 34. Qc8+ Qe8 35. Bxf7+ Kxf7 36. Qc4+ {Precision: White = 58%, Black = 28%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.10"]
[Round "5.4"]
[White "Anton Guijarro, David"]
[Black "Bartel, Mateusz"]
[Result "1-0"]
[ECO "A21"]
[WhiteElo "2643"]
[BlackElo "2600"]
[Annotator "TA"]
[PlyCount "119"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,119,19,17,14,19,20,29,29,29,28,59,50,89,85,95,90,78,86,93,82,105,76,137,115,136,127,147,152,143,147,186,189,195,192,195,189,197,207,302,231,220,218,247,247,246,247,254,249,295,272,303,288,361,258,264,208,346,324,312,300,355,337,314,166,199,199,199,208,332,332,397,382,372,364,493,490,479,438,509,519,515,503,504,472,422,401,627,601,678,647,790,791,773,758,741,728,689,608,593,586,563,530,1338,1268,1297,1295,1171,1008,1877,1710,1396,1361]} 1. c4 e5 2. Nc3 Bb4 3. Nd5 a5 4. a3 Be7 5. d4 d6 6. Nf3 {A21: English Opening: 1...e5 2 Nc3} (6. e4 Nf6 7. Nxe7 Qxe7 8. f3 Nfd7 9. Ne2 O-O 10. d5 Nc5 11. Be3 f5 12. Nc3 fxe4 13. Bxc5 dxc5 14. Nxe4 {½-½ (35) Matlakov,M (2700)-Yu,Y (2764) Caleta 2019}) 6... e4 7. Nd2 c6 8. Nxe7 {White has an edge.} Qxe7 9. Nb1 h6 $146 ({Predecessor:} 9... f5 10. Nc3 Nf6 11. Bg5 Be6 12. e3 O-O 13. Be2 {1-0 (13) Liu,Z (2300)-Dinev,D (2240) Novi Sad 2019}) 10. Bf4 Nf6 11. e3 O-O 12. Nc3 Rd8 13. Be2 Nbd7 14. b4 Nf8 15. c5 d5 (15... Ne8 $142) 16. b5 Ng6 17. Bg3 Bf5 18. bxc6 bxc6 19. Rb1 h5 20. Bxh5 Nxh5 21. Qxh5 Bc8 22. Rb6 Ra6 {White should prevent ...Rxb6.} 23. Rb8 Bb7 (23... Ra7 $142 24. O-O Ba6) 24. Rxd8+ Qxd8 25. O-O Ra8 26. Rb1 Ba6 27. Rb6 Qd7 28. h3 Nf8 29. Qg4 Ne6 30. Be5 Bc8 31. Qg3 Kh7 32. Bd6 Bb7 (32... Qe8 {was worth a try.} 33. Ne2 f6 34. Qh4+ Kg8) 33. Qh4+ Kg8 34. Qe7 Bc8 35. Qxd7 Bxd7 36. a4 (36. Rb7 $142 Bc8 37. Rb6) 36... Nd8 37. Rb8 Rxb8 38. Bxb8 $18 {[%mdl 4096] Endgame KBN-KBN} Bc8 (38... Ne6 $142 39. Ba7 Bc8) 39. Bc7 Nb7 40. Na2 Kf8 41. Nc1 Ke7 42. Nb3 Kd7 43. Bb6 Nd8 44. Bxd8 Kxd8 45. Nxa5 {KB-KN} Kc7 {If Black can now play ...Ba6 this consolidates a bit.} 46. Nb3 Ba6 47. Nd2 Bd3 (47... Be2 $142 48. f3 exf3 49. Nxf3 (49. gxf3 Bd1 $16) 49... f6) 48. Nf1 {White is clearly winning.} Bc2 49. a5 Kb7 50. Ng3 g6 51. h4 Bd1 52. h5 gxh5 53. Nf5 Ka6 54. Nh6 f6 55. Ng8 Kxa5 56. Nxf6 Kb4 57. Nd7 Kc3 58. Ne5 Ba4 59. f4 exf3 60. gxf3 {Accuracy: White = 84%, Black = 24%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.10"]
[Round "5.5"]
[White "Shirov, Alexei"]
[Black "Paravyan, David"]
[Result "1-0"]
[ECO "C48"]
[WhiteElo "2667"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "128"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,6,10,17,0,0,0,0,0,0,0,0,0,4,0,11,7,11,24,106,106,110,104,110,110,110,110,108,108,91,96,110,75,85,0,113,0,79,98,116,121,127,134,175,158,131,160,150,129,142,89,77,53,58,51,31,14,14,14,14,12,25,39,116,125,125,114,148,145,145,117,132,144,529,524,509,489,494,500,347,347,408,0,642,635,627,627,620,620,568,587,461,443,1895,1303,7225,6588,6516,5462,1306]} 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. Bb5 Nd4 5. Bc4 Bc5 6. d3 d6 7. Na4 {C48: Four Knights: 4 Bb5, replies other than 4...Bb4} b5 8. Nxd4 bxc4 ({Reject} 8... Bxd4 9. Bxb5+ Bd7 10. Bxd7+ Qxd7 11. c3 $14) 9. Nf5 {The position is equal.} Bxf5 $1 10. exf5 cxd3 11. Nxc5 dxc5 12. Qxd3 (12. cxd3 Qd7 13. Qf3 O-O 14. Bg5 Rab8 {½-½ (30) Kovalev,V (2664)-Ragger,M (2686) Batumi 2018}) 12... Qxd3 $146 ({Predecessor:} 12... O-O 13. Be3 Qc8 14. O-O-O e4 {1-0 (45) Baenziger,F (2379)-Kranz,A (2054) Austria 2018}) 13. cxd3 O-O-O 14. Ke2 Nd5 15. Rd1 Rhe8 16. g3 Rd6 17. Bd2 e4 18. dxe4 Rxe4+ 19. Kf3 Rd4 20. Be1 Nf6 21. Rxd4 cxd4 $11 {[%mdl 4096] Endgame KRB-KRN} 22. Rc1 Kb7 23. Bb4 Rb6 24. Bf8 Ne8 (24... g6 $11) 25. b3 $16 h5 26. h3 Ra6 27. Rc2 Ra5 28. g4 Rd5 29. Re2 hxg4+ 30. hxg4 Rd8 31. Be7 Rd7 32. Bf8 Rd8 33. Be7 Rd7 $1 {White must now prevent ...d3.} 34. Bc5 Nf6 35. Rd2 d3 36. g5 Ne8 37. Ke4 Kc6 38. b4 ({But not} 38. Bxa7 $6 Rd5 $14) 38... Nd6+ 39. Bxd6 $1 cxd6 40. Rxd3 {KR-KR} (40. Kxd3 $142 Re7 41. f4) 40... Re7+ 41. Kd4 {Threatens to win with Rc3+.} Re5 $1 42. Rf3 a5 43. a3 axb4 44. axb4 Rb5 45. Kc4 g6 46. Kb3 gxf5 (46... Re5 $14) 47. Rc3+ Kb6 48. Kc4 $1 {Strongly threatening Rd3.} Kc6 49. Ra3 d5+ 50. Kb3 $1 {And now Ra7 would win.} Kd6 51. Ra7 Ke5 $2 {[%mdl 8192]} (51... Ke6 $16) 52. Rxf7 $18 Rb6 53. Rf6 $1 {[%cal Rf6b6]} Rb7 54. Rc6 $1 d4 {[#]} 55. g6 $1 d3 {[#]} 56. Rc1 $2 (56. Rc5+ $1 $18 Ke6 57. Rc1) 56... Kf6 $2 {[%mdl 8192]} (56... Ke4 $11 57. Kc3 Rg7) 57. Rg1 {White is clearly winning.} d2 58. Kc3 Kg7 59. Rb1 Kxg6 60. Kxd2 Kf6 61. b5 {[%cal Bb4b5,Bb5b6][%mdl 32]} Ke5 (61... Rb6 $142 62. Kc3 Ke5) 62. b6 Kd4 63. Ke2 Kc5 64. Kf3 Kd5 {Accuracy: White = 87%, Black = 53%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.11"]
[Round "6.1"]
[White "Nguyen, Thai Dai Van"]
[Black "Michalik, Peter"]
[Result "1/2-1/2"]
[ECO "C65"]
[WhiteElo "2546"]
[BlackElo "2565"]
[Annotator "TA"]
[PlyCount "66"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,66,14,18,18,12,14,21,8,8,10,11,12,7,12,14,14,6,18,18,15,18,18,10,16,10,8,12,6,11,9,0,22,22,22,20,31,2,35,25,37,36,46,0,0,0,27,34,31,0,15,8,8,8,16,8,21]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. d3 Bc5 5. O-O d6 6. c3 O-O 7. Nbd2 a6 {C65: Ruy Lopez: Berlin Defence (3...Nf6), unusual lines and 4 0-0 Bc5} 8. Bxc6 bxc6 9. d4 exd4 10. cxd4 Bb6 11. Qc2 Re8 12. Re1 c5 13. d5 Bg4 14. b3 Ba5 {[#] Strongly threatening ...Bxf3.} 15. Re3 Bxf3 16. Nxf3 Qe7 {[%cal Rf6e4]} 17. Bd2 Bxd2 18. Nxd2 Ng4 {[#] ...Qe5 is the strong threat.} 19. Ree1 Qf6 20. Nc4 a5 {[#]} 21. Rad1 $146 ({Predecessor:} 21. Rac1 a4 22. bxa4 {½-½ (22) Turkov,V (2529)-Olofsson,D (2550) ICCF email 2016}) 21... Qh4 22. h3 Ne5 23. Re3 g6 24. Rf1 Qf4 25. Nb2 f5 26. exf5 Qxf5 27. Qxf5 (27. Qe2 {seems wilder.} Rf8 28. f4 Nd7 29. Na4 Nb6 30. Nxb6 cxb6 31. Qc4) 27... gxf5 28. Rfe1 {Hoping for f4.} f4 29. Re4 Rf8 $1 30. Nc4 Nd3 {The position is equal.} 31. Rd1 Nb4 32. Re7 Rf7 33. Re2 $1 f3 {Accuracy: White = 68%, Black = 73%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.11"]
[Round "6.2"]
[White "Ju, Wenjun"]
[Black "Bartel, Mateusz"]
[Result "1/2-1/2"]
[ECO "C78"]
[WhiteElo "2580"]
[BlackElo "2600"]
[Annotator "TA"]
[PlyCount "69"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,69,16,18,12,12,21,10,36,41,41,31,35,21,16,8,9,0,9,9,48,18,47,49,47,46,49,17,11,17,91,51,51,51,48,50,46,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Bb7 7. d3 Be7 8. a4 O-O 9. Nc3 Na5 10. axb5 Nxb3 11. cxb3 axb5 {C84: Closed Ruy Lopez: Unusual White 6th moves} 12. Rxa8 Bxa8 13. Nxb5 c5 14. Nc3 d6 15. Bg5 {[#]} Nh5 $146 ({Predecessor:} 15... h6 16. Bxf6 Bxf6 {½-½ (70) Edouard,R (2565)-Fedorchuk,S (2635) Paris 2009}) 16. Bxe7 Qxe7 17. Nd2 Nf4 18. Nc4 d5 19. Nb6 $36 {[%mdl 2048] White fights for an advantage.} d4 20. Ne2 Ne6 21. Nc4 Qc7 22. Qd2 Rb8 23. f4 exf4 24. Nxf4 Bc6 (24... Nxf4 $11 {remains equal.} 25. Qxf4 (25. Rxf4 Bc6 $11) 25... Qxf4 26. Rxf4 g6) 25. Nxe6 fxe6 26. Qg5 Be8 $1 27. Ra1 h6 28. Qg3 (28. Qg4 {is interesting.} Qe7 29. Ra3 Bb5 30. Ne5 Qd6 31. Qf4) 28... Qxg3 {The position is equal.} 29. hxg3 $11 {[%mdl 4096] Endgame KRB-KRN} Kf8 30. Ra3 Bb5 31. Ne5 Ke7 $1 32. Ra7+ Kd6 33. Nf7+ Kc6 34. Ne5+ {[%mdl 64] [#] Discovered Attack} Kd6 35. Nf7+ {Accuracy: White = 74%, Black = 67%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.11"]
[Round "6.3"]
[White "Stocek, Jiri"]
[Black "Anton Guijarro, David"]
[Result "1/2-1/2"]
[ECO "E10"]
[WhiteElo "2592"]
[BlackElo "2643"]
[Annotator "TA"]
[PlyCount "122"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,121,0,0,0,-12,0,0,-13,0,-29,-29,-36,-31,-28,-19,-12,-20,-13,-20,-41,-43,-59,-56,-47,-41,-54,-48,-47,-41,-60,-6,-4,-7,-7,0,-7,-10,0,-20,-13,0,-78,-78,-147,-39,-46,-47,-45,-44,-52,-51,-51,-41,-83,-80,-82,-46,-52,-50,-58,-25,-34,-30,-30,-29,-30,-30,-50,-53,-58,-50,-52,-29,-66,-27,-27,-27,-27,-27,-27,-27,-27,-27,-32,-25,-28,-19,-22,-20,-19,-17,-25,-12,-12,-12,-14,-22,-23,0,0,0,0,0,0,0,0,0,0,0,0]} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Nc3 dxc4 6. Bg2 O-O 7. O-O Nc6 8. Qa4 {E20: Nimzo-Indian: 4 g3 and 4 f3} Nd5 9. Qc2 Be7 10. Rd1 f5 (10... Ncb4 11. Qd2 c5 12. dxc5 Nxc3 13. bxc3 Nc6 14. Qc2 Qa5 15. Ng5 Bxg5 16. Bxg5 Qxc5 {½-½ (44) Cheparinov,I (2709)-Gelfand,B (2673) St Petersburg 2018}) 11. b3 $146 ({Predecessor:} 11. Qa4 Nb6 12. Qc2 Bf6 13. h4 Nb4 14. Qb1 Qe7 15. Bf4 N4d5 16. Be5 Nxc3 17. bxc3 Nd5 18. Qb2 a6 19. a4 Bd7 {0-1 (18) Kolehmainen,K-Elmeranta,M Finland 1994}) 11... Ncb4 12. Qb2 cxb3 13. Qxb3 Nxc3 14. Qxc3 Nd5 15. Qb3 b6 16. Bb2 Bb7 17. Rac1 Bd6 18. Nd2 a5 19. a4 f4 20. Nc4 Qf6 21. Rf1 Qg5 ({Black should try} 21... Bb4 $15) 22. Nxd6 $11 cxd6 23. Ba3 Rad8 24. e4 fxe3 25. fxe3 Rxf1+ 26. Rxf1 h5 27. Rf2 (27. Bh3 $11 Qg6 28. Qb1) 27... Rc8 $36 {[%mdl 2048] Hoping for ...Rc3. Black is on the roll.} 28. e4 {[#]} (28. Bb2 $142) 28... Qe3 (28... Rc3 $1 $17 {[%cal Rc3b3]} 29. Qb2 Qe3 30. exd5 Rxa3 31. dxe6 Bxg2 32. Kxg2 Qe4+ 33. Kg1 Re3) 29. Qxe3 $15 Nxe3 30. Bh3 Ng4 31. d5 exd5 32. exd5 Bxd5 {...Rc3 is the strong threat.} 33. Rd2 Rc3 34. Bxg4 {Black must now prevent Bb2.} hxg4 35. Bxd6 $17 {[%mdl 4096] Endgame KRB-KRB} Bf3 36. Be5 Ra3 37. Rd4 Ra1+ 38. Kf2 {Strongly threatening Rd8+.} Ra2+ 39. Ke3 Rxh2 40. Bc7 Rb2 41. Kf4 Kf7 42. Kf5 g6+ 43. Kg5 Bc6 44. Rxg4 b5 45. Rf4+ Ke7 46. Bxa5 bxa4 47. Bb4+ Ke6 48. Kxg6 Rb3 {aiming for ...a3.} 49. g4 $1 Ke5 50. Rf5+ Kd4 51. Bc5+ Kc4 {And now ...Be4 would win.} 52. Re5 a3 53. Bxa3 $1 Rxa3 $11 {KRB-KR} 54. g5 Kd4 55. Kf6 Be4 {[#]} 56. Rxe4+ $1 {[%mdl 576] Remove Defender. The position is equal.} Kxe4 {KR-KP} 57. g6 Ra6+ 58. Kf7 Kf5 {( -> ...Ra7+)} 59. g7 Ra7+ 60. Kg8 Kg6 {[%cal Ra7a8]} 61. Kh8 Rxg7 {Accuracy: White = 74%, Black = 69%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.11"]
[Round "6.4"]
[White "Paravyan, David"]
[Black "Krejci, Jan"]
[Result "1/2-1/2"]
[ECO "C50"]
[WhiteElo "2627"]
[BlackElo "2570"]
[Annotator "TA"]
[PlyCount "120"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,120,13,23,17,27,14,21,25,29,31,30,22,28,14,25,10,27,27,22,17,9,6,6,0,30,25,41,21,35,-59,-29,-29,-29,-29,-36,-42,-36,-35,-31,-37,-38,-108,8,25,17,-94,24,0,0,0,0,-196,-195,-194,-195,-194,-194,-194,-179,-211,-217,-361,-31,-21,0,0,0,-22,-22,-23,-23,-37,-37,-37,-37,-53,-52,-52,-53,-55,-55,-79,-63,-63,-63,-63,-63,-63,-63,-70,-36,-44,-8,-64,-8,-8,-8,-8,-8,-8,-8,-8,-8,-8,-8,-8,-8,-8,-8,-8,-8]} 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. O-O Nf6 5. d3 d6 6. c3 a6 7. a4 {C54: Giuoco Piano: 4 c3 Nf6, main lines with 5 d4 and 5 d3} Ba7 (7... O-O 8. Bg5 h6 9. Bh4 g5 10. Bg3 Ba7 11. Nbd2 Nh7 12. h3 h5 13. d4 h4 14. Bh2 g4 15. hxg4 Bxg4 16. dxe5 dxe5 {1-0 (45) Duda,J (2738)-Kramnik,V (2777) Wijk aan Zee 2019}) 8. Re1 h6 9. Nbd2 {[%cal Bb1d2,Bd2f1,Bf1g3][%mdl 32]} Be6 10. Bxe6 fxe6 11. Nf1 O-O 12. Ng3 $146 ({Predecessor:} 12. b4 Nh5 13. Be3 Bxe3 14. Rxe3 {0-1 (41) Svetushkin,D (2563)-Nikolov,M (2561) Achaia 2017}) 12... Qd7 13. h3 Rf7 14. b4 Raf8 15. b5 Ne7 16. bxa6 bxa6 17. d4 exd4 18. cxd4 Ng6 19. Be3 Nh7 20. Qe2 ({Better is} 20. d5 $14 Bxe3 21. Rxe3) 20... Rxf3 21. gxf3 Ng5 22. Bxg5 $1 (22. Qxa6 $2 Nxf3+ 23. Kf1 Bxd4 $17) 22... hxg5 23. Red1 Nf4 24. Qf1 e5 25. dxe5 Nxh3+ 26. Kh2 (26. Kg2 $1 $15 Nf4+ 27. Kg1) 26... g4 (26... Rxf3 $17 27. Qc4+ Kh7) 27. Qc4+ $11 Kh7 28. exd6 ({Not} 28. Qxa6 $2 Bxf2 29. Nf5 Nf4 $19) (28. Nf5 $11 Qe8 29. Rh1 (29. exd6 $2 Nxf2 30. Kg2 Nxd1 $19) (29. Qxc7 Rxf5 30. Qxa7 Qxe5+ 31. f4 Qxf4+ {[%mdl 64] Double Attack} 32. Kg2 Qf3+ 33. Kh2 Nf4 34. Qxg7+ Kxg7 35. exf5 Qg2#) (29. fxg4 Nxf2 {[%mdl 64] Double Attack} 30. Rh1 Nxh1 $11)) 28... Nxf2 (28... Bxf2 $17 29. Nh5 (29. dxc7 Bxg3+ 30. Kxg3 Rxf3+ 31. Kg2 Rf2+ 32. Kg3 Qe7 $19) (29. Nf5 Nf4 $19) 29... cxd6) 29. Rd5 gxf3 30. Rh5+ Kg6 31. Rf1 $2 (31. Qxc7 $11 Ng4+ 32. Kh1 Nf2+ 33. Kh2 Ng4+ 34. Kh3 Nf2+ {[%mdl 64] Discovered Attack (Double check)} 35. Kh2) 31... Ng4+ $19 32. Kh1 {[#]} Ne3 $1 {[%cal Re3c4]} 33. Qxa6 Qxd6 34. Qxd6+ cxd6 35. Rf2 {[#]} Ng4 $1 {[%mdl 1024] Black has strong compensation.} 36. Rd2 (36. Rf1 {was the only defense.}) 36... Nf2+ $2 (36... Rc8 $19 {( -> ...Rc1+)} 37. Rxd6+ Kf7 38. Rf5+ Ke7 39. Rxf3 Kxd6) 37. Kh2 $15 Ng4+ 38. Kh3 Nf2+ 39. Rxf2 Bxf2 $11 {[%mdl 4096] Endgame KRB-KRN} 40. Rf5 Ra8 41. Rxf3 Bc5 42. Nf5 Rxa4 43. Rg3+ Kf6 44. Nxg7 Rxe4 45. Nh5+ Kf5 46. Rd3 Re1 47. Rd5+ Ke4 48. Nf6+ Kf4 49. Nh5+ Kf3 {[%cal Re1h1]} 50. Rf5+ Ke3 51. Rd5 Rf1 {next ...Ke4 is good for Black.} 52. Ng3 (52. Kg4 $1 $11) 52... Rf6 ({Black should play} 52... Rf4 $15) 53. Kg4 {The position is equal.} Rf4+ 54. Kg5 Rf8 {With the idea ...Kf3.} 55. Kg4 Rg8+ (55... Ba3 {looks sharper.} 56. Rf5 Rg8+ 57. Rg5 Ra8 58. Rd5 Bc5) 56. Rg5 $1 {[%cal Rg5g8]} Rxg5+ 57. Kxg5 d5 {aiming for ...Kf3.} 58. Kf6 d4 {Threatens to win with ...d3.} 59. Nf5+ $1 Ke4 {White must now prevent ...d3.} 60. Nxd4 $1 Bxd4+ {Accuracy: White = 44%, Black = 40%.} (60... Kxd4 $2 61. Ke6 $19) 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.11"]
[Round "6.5"]
[White "Praggnanandhaa, R."]
[Black "Shirov, Alexei"]
[Result "1-0"]
[ECO "C54"]
[WhiteElo "2532"]
[BlackElo "2667"]
[Annotator "TA"]
[PlyCount "119"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,119,35,36,37,43,39,70,78,92,85,149,158,167,162,166,154,175,172,162,134,150,136,149,115,181,173,172,188,179,187,180,182,230,141,126,36,95,62,193,183,192,145,186,133,167,171,178,168,225,179,202,0,215,195,308,300,321,334,286,219,270,0,224,0,269,204,207,204,203,191,190,173,190,150,151,154,166,76,117,77,106,105,197,197,197,197,182,189,386,383,597,587,619,619,616,572,489,470,29970,29972,12309,8445,29974,29974,29993,29994]} 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 O-O 6. O-O d5 7. exd5 Nxd5 8. Re1 Bg4 9. Nbd2 {C54: Giuoco Piano: 4 c3 Nf6, main lines with 5 d4 and 5 d3} Bb6 (9... Nb6 10. h3 Bh5 11. Bb3 Kh8 12. Ne4 Bd6 13. g4 Bg6 14. d4 exd4 15. Nxd4 Nxd4 16. Qxd4 Be7 {1-0 (48) Giri,A (2783)-Inarkiev,E (2693) St Petersburg 2018}) 10. a4 a6 $146 ({Predecessor:} 10... Bh5 11. Ne4 f6 12. b4 a6 13. Bd2 Kh8 14. h3 Nce7 15. Rb1 a5 16. b5 c5 17. bxc6 bxc6 18. Ng3 Bf7 {½-½ (18) Ruefenacht,M (2460)-Rost,D (2463) ICCF email 2013}) 11. Ne4 {White is slightly better.} f6 12. d4 {Black must now prevent dxe5.} Kh8 (12... Bxf3 $142 13. Qxf3 Kh8) 13. dxe5 $16 Bxf3 14. gxf3 Nce7 15. exf6 gxf6 16. a5 Ba7 17. Ng3 Rg8 18. f4 c6 19. Bd3 Qd7 (19... Ng6 $16) 20. c4 $1 $18 {[%cal Rc4d5]} Nb4 21. Be4 Rad8 22. Qxd7 Rxd7 23. Ra4 Bc5 24. b3 Bd4 25. Re2 (25. Rxb4 $6 Bc3 $14) (25. Ba3 $16 c5 26. Kf1 (26. Bxb4 cxb4 27. Ra2 h5 $14)) 25... c5 (25... Bc3 $14 26. Kg2 Ng6) 26. Kg2 Nec6 ({Black should try} 26... f5 $14 27. Bb1 Nbc6) 27. Bd2 $1 Rgd8 28. Be1 Rg7 29. h3 ({White should play} 29. Kf3 $18) 29... Rgd7 30. Kf1 Kg7 31. Nf5+ Kf7 (31... Kh8 $142 32. Rd2 Re8) 32. Rd2 Re8 33. Re2 Red8 $1 34. h4 Kf8 (34... h5 {was called for.} 35. f3 Kg8 36. Rg2+ Kf8) 35. h5 Rc7 36. h6 Kf7 37. Ng7 Re7 38. Nf5 $2 ({Don't do} 38. Bxh7 $6 Rxe2 39. Kxe2 Bb2 $16) (38. f3 $18) 38... Red7 $2 (38... Rc7 $1 $11 {and Black stays safe.}) 39. Ng7 Re7 $1 40. f5 ({Resist} 40. Bxh7 $6 Rxe2 41. Kxe2 Bb2 $18) 40... Be5 {[#]} 41. f4 $1 {[%mdl 576] Decoy} Bxf4 42. Ne6 Rxe6 43. fxe6+ {[%mdl 64] Discovered Attack} Ke7 44. Bc3 Rd1+ 45. Re1 Rd8 46. Bxh7 (46. Ke2 $18) 46... Bxh6 47. Be4 Bd2 48. Bxb4 $1 Bxb4 {[#]} (48... Nxb4 $16 49. Rd1 Rd4) 49. Re3 $1 Rd1+ 50. Kg2 Rd2+ {[#]} 51. Kh3 $1 Nxa5 $2 (51... Rd8 52. Ra2 Bd2) 52. Bd5 Rb2 (52... Rc2 $142 53. Ra1 Rc3 54. Rxc3 Bxc3) 53. Ra1 Bd2 54. Rg3 Rxb3 55. Rxb3 Nxb3 {KRB-KBN} 56. Rb1 Nd4 (56... Na5 $18 57. Kg4 (57. Bxb7 Nxb7 58. Rxb7+ Kxe6 $11) 57... Ke8) 57. Rxb7+ Ke8 58. Kg4 f5+ 59. Kh5 Be1 60. e7 {Accuracy: White = 66%, Black = 31%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.12"]
[Round "7.1"]
[White "Shirov, Alexei"]
[Black "Ju, Wenjun"]
[Result "1-0"]
[ECO "E10"]
[WhiteElo "2667"]
[BlackElo "2580"]
[Annotator "TA"]
[PlyCount "47"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,47,-6,20,14,32,18,39,27,47,64,40,33,86,47,91,84,139,129,151,159,165,166,162,145,134,139,200,200,192,179,191,198,196,-718,188,188,186,201,409,401]} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. g3 Bb4+ 5. Bd2 Bd6 (5... Be7 6. Bg2 O-O 7. O-O c6 8. Qc2 Nbd7 9. Bf4 b6 10. Rd1 Ba6 11. cxd5 cxd5 12. Ne5 Nxe5 13. dxe5 Ng4 14. Bf3 f5 15. exf6 Nxf6 16. Qa4 Bb7 17. Nd2 Qe8 18. Qxe8 Rfxe8 {½-½ (29) Giri,A (2783)-Ding,L (2813) Wijk aan Zee 2019}) 6. Nc3 {E01: Catalan: Early deviations} c6 7. Qc2 O-O 8. e4 {e5 is the strong threat.White is slightly better.} dxe4 9. Nxe4 Nxe4 10. Qxe4 Nd7 (10... c5 $14) 11. Bd3 $16 {[%csl Gd3][%cal Re4h7]} Nf6 12. Qh4 $1 Re8 (12... g6 $142) 13. O-O-O $146 b5 14. c5 ({Much weaker is} 14. cxb5 $6 cxb5 15. Rhe1 Bb7 $11) 14... Bxc5 15. g4 $1 {[%cal Rg4g5]} Bxd4 16. g5 Bxb2+ 17. Kc2 $1 Qd5 (17... g6 $16) 18. gxf6 $40 {[%mdl 128] White is out for blood.} Bxf6 19. Qxh7+ Kf8 20. Bb4+ c5 21. Qh8+ Ke7 {[#]} 22. Qxe8+ $1 {[%mdl 512]} Kxe8 23. Bxb5+ {[%mdl 64] [#] Discovered Attack} Kd8 $2 {[#]} (23... Qd7 $1 {[%mdl 512]} 24. Rxd7 (24. Bxd7+ Bxd7 25. Rxd7 Kxd7 $16) 24... Bxd7 25. Bxd7+ Kxd7) 24. Bc6 $1 {[%mdl 64] Pin. Accuracy: White = 98%, Black = 39%.} ({Not} 24. Rxd5+ exd5 25. Ba5+ (25. Bxc5 Rb8 $14) 25... Ke7 $16) 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.12"]
[Round "7.2"]
[White "Krejci, Jan"]
[Black "Praggnanandhaa, R."]
[Result "1-0"]
[ECO "A05"]
[WhiteElo "2570"]
[BlackElo "2532"]
[Annotator "TA"]
[PlyCount "93"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,93,15,15,16,22,13,4,22,16,0,6,14,57,20,14,35,71,79,71,78,85,39,114,108,127,139,160,166,158,158,173,172,172,172,169,170,176,174,156,156,164,115,115,118,117,115,168,178,156,168,206,206,230,216,368,364,350,276,319,239,229,229,1317,417,29974,29976,29978,1234,5366,752,1772,722,29975,6243,6187,5181,29972,29965,29978,29979,29983,29984,29984,29985,29986,29987]} 1. Nf3 Nf6 2. g3 b5 3. Na3 a6 4. c4 (4. b3 e6 5. c4 bxc4 6. bxc4 c5 7. Bg2 Bb7 8. Rb1 Bc6 9. O-O Be7 10. d3 O-O 11. Nc2 {½-½ (91) Duda,J (2717)-Georgiev,K (2623) Riadh 2017}) 4... b4 5. Nc2 a5 6. Bg2 {A05: Réti Opening: 1 Nf3 Nf6} Bb7 7. d4 g6 $146 ({Predecessor:} 7... Be4 8. a3 b3 9. Ne3 a4 10. g4 h6 11. Nf5 Nxg4 12. Ng3 Bc2 13. Qd2 Nf6 14. e4 Bxe4 15. Nxe4 Nxe4 {0-1 (40) Zaragatski,I (2502)-Belezky,A (2397) Germany 2017}) 8. O-O {The position is equal.} Bg7 9. b3 Na6 10. Bb2 c5 11. a3 cxd4 12. axb4 (12. Qxd4 Nh5 $17) 12... Nxb4 13. Nxb4 axb4 14. Bxd4 Rb8 15. Ba7 Rc8 ({Better is} 15... Ra8 $14) 16. Qe1 $36 {[%mdl 2048] White is on the roll.} Nh5 17. Qxb4 Bxf3 18. Bxf3 (18. exf3 $6 Bxa1 19. Rxa1 d6 $14) 18... Bxa1 19. Rxa1 O-O 20. Bb6 Qe8 21. Bb7 d6 22. Bxc8 Qxc8 23. c5 dxc5 24. Bxc5 Qe6 25. e3 Nf6 26. Qb7 Re8 27. Bd4 h5 (27... Qe4 $16 28. Ra7 Qxb7 29. Rxb7 e5) 28. Ra8 $18 Rxa8 29. Qxa8+ Kh7 30. Bxf6 $1 exf6 {[%mdl 4096] Endgame [#] KQ-KQ} 31. Qa4 $1 g5 $2 (31... Kg7 32. Kg2 Kf8) 32. Qc4 {Strongly threatening Qxe6.} Qd7 33. b4 {[%cal Bb3b4,Bb4b5,Bb5b6,Bb6b7][%mdl 32]} Kg7 34. h4 Qd1+ 35. Kg2 g4 $2 (35... gxh4 36. Qxh4 (36. gxh4 Qa4 $16) 36... Qd5+ 37. Kh2 Qf5) 36. Qc6 (36. b5 $142 Qf3+ 37. Kg1) 36... Qb1 (36... Qd3 $18 37. b5 f5) 37. b5 Qb3 38. Qc5 (38. b6 $142 Qb2 39. b7 Qe5 40. Qb6 Qb8 41. Qa6 Qe5 42. Qa7 Qe4+ 43. Kh2) 38... Kg6 39. Kh2 (39. b6 $142 Qe6 40. Qc2+ Kg7 41. Qb2 Qe4+ 42. Kh2) 39... Qb1 40. b6 Qb2 41. e4 (41. Kg2 $142 Qb1 42. Qc6 Kg7 43. b7 Qb3 44. Qc7 Qd5+ {[#]} 45. e4 $1 {[%mdl 512]} (45. Kh2 Qf3 $11) 45... Qxe4+ 46. Kh2) 41... Kg7 42. Kg2 Qb1 43. Qc6 {White mates.} Qb3 44. b7 Qb4 45. Qc7 Qxe4+ 46. Kh2 Qf3 47. Qb6 {Accuracy: White = 64%, Black = 35%.} ({Worse is} 47. b8=Q Qxf2+ 48. Kh1 Qf1+ 49. Kh2 Qf2+ 50. Kh1 Qf3+ 51. Kg1 Qd1+ 52. Kh2 Qe2+ 53. Kh1 (53. Kg1 Qd1+ 54. Kh2 Qe2+ 55. Kh1 Qf1+ 56. Kh2 Qf2+ $11) 53... Qf1+ 54. Kh2 Qf2+ $11) 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.12"]
[Round "7.3"]
[White "Michalik, Peter"]
[Black "Paravyan, David"]
[Result "0-1"]
[ECO "B99"]
[WhiteElo "2565"]
[BlackElo "2627"]
[Annotator "TA"]
[PlyCount "92"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 24,92,21,21,18,13,17,29,8,44,37,37,48,41,33,14,53,1,22,0,25,0,12,0,0,-59,-49,-52,-12,-38,0,-17,-12,-16,0,-65,-47,-75,-79,-103,-97,-89,-77,-85,-91,-97,-83,-114,-98,-129,-102,-234,-227,-266,-281,-315,-306,-457,-426,-720,-740,-29975,-29976,-29978,-29979,-29979,-29980,-29980,-29980,-29981,-29982]} 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 Be7 8. Qf3 Qc7 9. O-O-O Nbd7 10. g4 b5 {[%cal Bb7b5,Bb5b4][%mdl 32]} 11. Bxf6 Nxf6 12. g5 Nd7 13. f5 O-O {Strongly threatening ...b4. B99: Sicilian Najdorf: 6 Bg5 e6 7 f4 Be7 8 Qf3 Qc7 9 0-0-0 Nbd7} 14. Rg1 (14. f6 gxf6 15. gxf6 Nxf6 $17) (14. h4 b4 15. Nce2 Bb7 16. Kb1 Rac8 17. Bh3 e5 18. f6 exd4 19. fxe7 Rfe8 20. Nxd4 Rxe7 21. Nf5 Rxe4 22. Nxd6 Rd4 23. Qxf7+ Kh8 24. Nxc8 {1-0 (24) Sutovsky,E (2683)-Huschenbeth,N (2596) Douglas 2017}) 14... b4 $1 {[%cal Rb4c3]} 15. Nce2 {Black must now prevent f6.} e5 $1 {[%cal Re5d4] White has an edge.} 16. f6 $1 {[%cal Rf6e7]} exd4 17. fxe7 Re8 18. Nxd4 Ne5 19. Qf2 Be6 $146 ({Predecessor:} 19... Rxe7 20. Nf5 Re8 21. Qg3 Be6 22. Nxd6 Re7 23. Nf5 Ree8 24. Nd6 Re7 25. Nf5 Ree8 {½-½ (25) Senzacqua,F (2137)-Pasta,P (2123) ICCF email 2016}) 20. Kb1 (20. Nxe6 $14 fxe6 21. Be2) 20... Qc5 21. Rg2 Rxe7 22. h4 a5 (22... Bg4 {seems wilder.} 23. Be2 Bxe2 24. Qxe2 g6 25. h5 Nc4) 23. Nxe6 fxe6 24. Qd2 (24. Qxc5 $11 dxc5 25. Rgd2) 24... Rf8 25. Be2 Rd7 26. h5 a4 27. h6 g6 28. Qd4 Rf4 29. Rgg1 (29. c3 $11) 29... Kf8 $15 30. Rg3 Ke7 31. a3 Rb7 $1 32. axb4 Rxb4 33. Qxc5 dxc5 34. Rc3 {[#]} c4 $1 ({Don't play} 34... Rfxe4 $6 35. Rxc5 Rxe2 36. Rc7+ Ke8 37. Rc8+ Kf7 38. Rc7+ Ke8 39. Rc8+ Kf7 40. Rc7+ Ke8 $11) 35. Re3 Rf2 36. Ka2 Rb6 37. Rd4 (37. Kb1 $17 {was called for.}) 37... Rd6 $19 38. Rxd6 Kxd6 {[%mdl 4096] Endgame KRB-KRN} 39. Kb1 Kc5 40. Kc1 {[#]} (40. c3 $142) 40... a3 $1 {[%mdl 512]} 41. bxa3 (41. Bd1 $142 Nd3+ 42. cxd3) 41... Kd4 42. Kd2 {[#]} c3+ $1 {[%mdl 512] Black mates.} 43. Rxc3 {[#]} Rxe2+ $1 {[%mdl 576] Deflection} 44. Kxe2 Kxc3 45. a4 Nc4 46. e5 Kxc2 {Accuracy: White = 35%, Black = 69%.} 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.12"]
[Round "7.4"]
[White "Anton Guijarro, David"]
[Black "Nguyen, Thai Dai Van"]
[Result "1-0"]
[ECO "E20"]
[WhiteElo "2643"]
[BlackElo "2546"]
[Annotator "TA"]
[PlyCount "95"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,95,0,-12,-16,-8,0,0,0,0,0,0,0,0,16,1,8,0,28,23,28,43,59,43,59,59,59,59,50,32,79,80,97,97,97,100,93,93,93,92,98,105,102,83,83,87,116,95,127,133,133,127,126,125,129,124,135,137,141,104,136,135,148,136,151,156,148,153,152,142,242,217,282,289,312,258,325,323,314,277,297,266,260,237,347,333,418,412]} 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. f3 c5 5. d5 O-O 6. e4 b5 {E20: Nimzo-Indian: 4 g3 and 4 f3} (6... d6 7. Bg5 exd5 8. cxd5 Nbd7 9. Bd3 Ne5 10. Nge2 c4 11. Bc2 Bc5 12. Qd2 h6 13. Be3 Qb6 14. Bxc5 Qxc5 {½-½ (68) Mamedyarov,S (2817)-Aronian,L (2765) Kolkata 2018}) 7. Nh3 bxc4 8. Bxc4 exd5 {The position is equal.} 9. Bxd5 Nxd5 10. Qxd5 Ba6 11. Bf4 Nc6 {[%cal Bb8c6,Bc6b4,Bb4d3][%mdl 32]} 12. Kf2 Ba5 $146 ({Predecessor:} 12... Nd4 13. Rhd1 Qb6 {1-0 (48) Berkes,F (2661)-Szabo,G (2563) Heraklio 2017}) 13. Rhd1 Nb4 14. Qd6 Re8 15. Kg1 $1 c4 16. Bg3 $36 {[%mdl 2048] White has good play.} Re6 17. Qxd7 Nd3 18. Qxd8+ Rxd8 19. Rab1 Ree8 20. Nf4 $1 Nxb2 21. Rxd8 Rxd8 22. Nfd5 Nd3 23. Bc7 Bxc7 24. Nxc7 Bc8 25. Rb8 {Black must now prevent N7b5.} Ne5 26. N7b5 Nc6 27. Ra8 g5 28. Nd5 a6 29. Na3 c3 30. Nxc3 Be6 {[#]} 31. Rxd8+ $1 Nxd8 $16 {[%mdl 4096] Endgame KBN-KNN} 32. Kf2 Nc6 33. Nc2 f5 34. a3 Kf7 35. Ke3 f4+ {[#]} 36. Kd3 $1 a5 37. Nd5 Bc8 38. Nc7 Ke7 39. Kc4 Kd6 (39... Ne5+ $16 {was worth a try.} 40. Kc5 Nd3+ 41. Kb5 Kd6) 40. Nb5+ $18 Ke5 41. Kc5 Nd8 42. Ne1 Ne6+ 43. Kb6 a4 44. Nd3+ Kf6 45. e5+ Ke7 46. Nb4 Nf8 (46... Nd8 $142 47. Nd4 Be6) 47. Nd4 Be6 48. Kc7 {Accuracy: White = 91%, Black = 49%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.12"]
[Round "7.5"]
[White "Bartel, Mateusz"]
[Black "Stocek, Jiri"]
[Result "0-1"]
[ECO "B52"]
[WhiteElo "2600"]
[BlackElo "2592"]
[Annotator "TA"]
[PlyCount "116"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,116,0,15,20,32,0,14,-12,-16,-14,-20,-26,0,-33,-29,-23,-9,-25,0,-25,-2,-41,0,0,0,0,0,0,0,-7,-14,-6,0,-3,0,-25,4,0,0,0,0,0,25,23,90,0,0,-86,-86,-86,-86,-94,-100,-88,-31,-31,-25,-22,-21,-88,-88,-137,-121,-160,-160,-160,-123,-160,-160,-160,-160,-160,-120,-129,-172,-182,-174,-472,-430,-365,-368,-1304,-576,-29972,-29973,-29974,-29975,-29978,-29979,-29978,-29979,-29980,-29981,-29981,-29978,-29978,-29979,-29979,-29980,-29980,-29981,-29981,-29982,-29982,-29983,-29983,-29984,-29984,-29985]} 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. c4 Nf6 5. Nc3 g6 (5... a6 $5 {[%cal Ra6b5]} 6. Bxd7+ Nbxd7 $11) 6. O-O {B52: Sicilian: Moscow Variation with 3...Bd7} Bg7 7. Re1 O-O 8. h3 $146 {The position is equal.} ({Predecessor:} 8. d4 cxd4 9. Nxd4 Nc6 10. Bxc6 bxc6 11. c5 dxc5 12. Nb3 c4 {0-1 (74) Onischuk,V (2594)-Bukavshin,I (2578) Taganrog 2014}) 8... a6 9. Bxd7 Nfxd7 10. d4 Nc6 {[%cal Rc5d4]} 11. Be3 Qa5 12. a3 cxd4 13. Nxd4 Rac8 14. Nd5 {Strongly threatening Nxc6.} Rfe8 15. b3 Qd8 16. Rb1 e6 {aiming for ...Bxd4.} 17. Nb4 {[%cal Bd5b4,Bb4c2,Bc2e3,Be3g4][%mdl 32] Black should prevent Ndxc6.} Nxd4 18. Bxd4 Ne5 19. Qd2 a5 20. Nc2 a4 21. Ne3 axb3 22. Rxb3 Bh6 23. Rxb7 Nxc4 24. Qd3 Qa5 25. Reb1 Qd2 26. Ng4 Bg7 {[#]} (26... Bg5 $1 $11 27. Qf3 Rf8) 27. Qxd2 (27. Rxf7 $1 $16 {[%mdl 512]} Bxd4 (27... Kxf7 28. Qf3+) 28. Rbb7 $1 {[%mdl 512]} Qc1+ 29. Kh2) 27... Nxd2 $11 28. Bxg7 (28. R1b4 $11) 28... Kxg7 $17 ({Not} 28... Nxb1 $2 29. Bh6 $18) 29. Re1 h5 30. Nh2 Rc4 31. f3 Ra4 ({Better is} 31... Rc2 $17) 32. Nf1 $15 Nxf1 33. Kxf1 Rxa3 {[%mdl 4096] Endgame KRR-KRR} 34. Rc1 (34. Rd7 $11) 34... h4 $17 35. Rcc7 Rf8 36. Ra7 Rxa7 37. Rxa7 {KR-KR} Kf6 38. g3 hxg3 39. Kg2 Ke5 40. Kxg3 f5 41. Ra5+ d5 42. exd5 exd5 43. f4+ $2 (43. Ra6 {was necessary.}) 43... Ke4 $19 44. Ra6 Re8 45. Rxg6 $2 (45. Ra1 Kd3 46. Rd1+ Kc4 47. Rc1+ Kd4 48. Rd1+ Kc4 49. Rc1+ Kb3 50. Rd1) 45... d4 (45... Ke3 $142 46. Kg2 d4) 46. h4 Ke3 {Black mates.} 47. h5 d3 48. h6 d2 49. Rd6 {[#]} Rg8+ $1 50. Kh4 Rg1 51. h7 d1=Q 52. Rxd1 Rxd1 {KR-KPP} 53. Kg5 Rh1 54. Kxf5 Rxh7 55. Kg6 Rh1 56. f5 Rg1+ 57. Kf7 {[#]} Kf4 $1 58. f6 Kf5 {Accuracy: White = 37%, Black = 57%.} 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.13"]
[Round "8"]
[White "Shirov, Alexei"]
[Black "Krejci, Jan"]
[Result "1/2-1/2"]
[ECO "C99"]
[WhiteElo "2667"]
[BlackElo "2570"]
[Annotator "TA"]
[PlyCount "68"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 34,68,28,20,19,19,19,29,21,29,19,0,0,0,16,9,0,11,14,4,25,8,0,0,0,-10,0,-9,-9,-9,-11,-8,-9,-9,0,-17,-16]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7 6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 Na5 10. Bc2 c5 11. d4 Qc7 12. Nbd2 cxd4 13. cxd4 Nc6 14. Nb3 a5 15. Be3 a4 16. Nbd2 Bd7 17. Rc1 Qb7 18. Qe2 Rfe8 {C99: Closed Ruy Lopez: Chigorin Defence: 11 d4 Qc7 12 Nbd2 cxd4} 19. Bd3 Rab8 20. dxe5 Nxe5 {White has an edge.} 21. Nxe5 dxe5 22. Nf3 Bb4 23. Red1 Bc6 (23... h6 {looks sharper.} 24. a3 Ba5 25. Rc5 Bc7 26. Nh4 Bb6) 24. Bc5 Bxc5 25. Rxc5 Nd7 26. Rc3 Nf8 $146 27. Qc2 Bd7 $1 {The position is equal.} 28. b3 axb3 29. axb3 Rbc8 30. b4 f6 31. Nd2 Rxc3 32. Qxc3 Rc8 33. Qb2 Be8 34. Bb1 Bf7 {Accuracy: White = 66%, Black = 77%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.13"]
[Round "8"]
[White "Paravyan, David"]
[Black "Guijarro, David Anton"]
[Result "0-1"]
[ECO "A45"]
[WhiteElo "2627"]
[BlackElo "2643"]
[Annotator "TA"]
[PlyCount "82"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,82,20,6,-16,-2,-11,-14,-25,-9,-39,-29,-45,-40,-47,-54,-58,-42,-65,-77,-77,-60,-69,-77,-63,-69,-74,-55,-101,-101,-108,-109,-117,-114,-138,-65,-102,-71,-83,-91,-150,-87,-150,-100,-99,-111,-95,-138,-93,-94,-103,-94,-171,-170,-189,-177,-192,-201,-208,-177,-172,-173,-193,-168,-324,-318,-404,-365,-411,-410,-408,-407,-446,-439,-680,-674]} 1. d4 Nf6 2. Bg5 c5 3. d5 d6 4. Nc3 h6 5. Bd2 b5 6. Nxb5 {A45: Trompowsky Attack} Nxd5 7. e4 $146 ({Predecessor:} 7. Nc3 Nb6 8. e4 g6 9. Nf3 Bg7 10. a4 O-O 11. a5 N6d7 {0-1 (32) Irgaliyev,A (2175)-Xiong,J (2672) chess.com INT 2019}) 7... Nb6 $1 8. a4 {The position is equal.} a6 9. Nc3 Nc6 10. f4 e6 11. Nf3 Be7 12. Bd3 O-O 13. a5 Nd7 $1 14. Ne2 d5 15. b3 dxe4 16. Bxe4 Bb7 17. O-O Nf6 18. Bd3 Nb4 19. Bc4 Ne4 20. Be1 Bf6 21. c3 Nc6 (21... Nd5 $17 {Threatens to win with ...Ne3.} 22. Qc1 Qd6) 22. Qc2 Nxa5 23. Bd3 Nd6 $1 ({And not} 23... Nxb3 24. Rb1 $16) 24. Ne5 {[#]} (24. Qa2 $142 Nc6 25. Bf2) 24... Qc7 ({Black should play} 24... c4 $1 {[%cal Rc4d3][%mdl 512]} 25. Nxc4 (25. bxc4 Bxe5) 25... Naxc4 26. bxc4 Qc7) 25. Ng4 (25. c4 $142 Nc6 26. Bc3) 25... Be7 26. c4 {[#]} Nc6 $1 27. Bc3 f5 28. Ne5 Bf6 29. Rae1 Rad8 ({Don't blunder} 29... Nxe5 $2 30. fxe5 Bg5 31. exd6 $18) 30. Ng3 {[#]} (30. Nxc6 $17 Qxc6 31. Rf2) 30... Nb4 $1 $19 {[%cal Rb4c2]} 31. Bxb4 cxb4 32. c5 Nb5 {[%cal Bd6b5,Bb5d4,Bd4e2][%mdl 32] Strongly threatening ...Na3.} 33. Qc4 Bxe5 34. Rxe5 Kh8 35. Be2 Nd4 $40 {[%mdl 128] Black attacks with force.} 36. Re3 $2 (36. Rc1) 36... a5 37. Rf2 Nxe2+ 38. Rexe2 Bd5 39. Qc2 Rc8 40. Qb2 Qxc5 41. Rc2 (41. Nf1 $142) 41... Qe3 {Accuracy: White = 32%, Black = 74%.} 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.13"]
[Round "8"]
[White "Ju, Wenjun"]
[Black "Stocek, Jiri"]
[Result "1-0"]
[ECO "B52"]
[WhiteElo "2580"]
[BlackElo "2592"]
[Annotator "TA"]
[PlyCount "77"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,77,16,14,7,6,13,10,11,4,42,47,56,41,59,41,52,45,44,39,66,56,60,34,38,34,35,37,37,37,44,44,48,37,65,55,79,92,207,147,147,152,216,181,183,175,254,267,304,292,378,382,372,369,486,479,486,485,485,462,447,469,593,577,597,572,659,607]} 1. e4 c5 2. Nf3 d6 3. Bb5+ Bd7 4. Bxd7+ Nxd7 5. O-O Ngf6 6. Qe2 e6 7. c3 Rc8 {B52: Sicilian: Moscow Variation with 3...Bd7} 8. d4 cxd4 9. cxd4 d5 {The position is equal.} 10. e5 Ne4 11. Be3 Be7 (11... Nb6 12. Ne1 f5 13. f3 Ng5 14. b3 Nf7 {½-½ (30) Mamedov,R (2680)-Ivanchuk,V (2729) Kocaeli 2017}) 12. Ne1 {Threatens to win with f3.} f5 13. f3 Ng5 14. Nd3 O-O 15. Nc3 Qb6 {[#]} 16. Rfc1 $146 ({Predecessor:} 16. Rac1 Qa6 17. Rc2 Rc6 18. Rfc1 Rfc8 19. Qd2 {1-0 (48) Guliyev,N (2549)-Gerber,R (2400) Geneve 2011}) 16... Nf7 17. Rc2 Rc6 18. Na4 Qa6 19. Rxc6 Qxc6 20. b3 Ba3 21. Bc1 Be7 22. Bd2 b5 23. Rc1 {[%cal Ba1c1,Bc1c5,Bc5b5][%mdl 32]} Qa6 24. Nf4 Nb8 (24... Bg5 $16) 25. Nc5 Bxc5 26. Rxc5 Nd8 (26... Nd7 $16) 27. Rxb5 Nbc6 28. Be3 $36 {[%mdl 2048] Keeping Black busy.} g5 {[#]} (28... h6 $142 29. a4 Rf7) 29. Nh5 $1 $18 f4 30. Bf2 Rf7 31. Nf6+ Kh8 32. a4 Ne7 33. Qc2 {White is clearly winning.} Ndc6 34. h4 gxh4 35. Bxh4 Nf5 36. Bf2 Rf8 37. Qd2 Qc8 38. Qxf4 Qc7 39. Qd2 {Accuracy: White = 88%, Black = 37%.} 1-0

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.13"]
[Round "8"]
[White "Nguyen, Thai Dai Van"]
[Black "Bartel, Mateusz"]
[Result "1/2-1/2"]
[ECO "B04"]
[WhiteElo "2546"]
[BlackElo "2600"]
[Annotator "TA"]
[PlyCount "78"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 14,78,42,60,46,13,34,20,35,35,52,55,56,38,60,29,37,22,33,33,35,42,43,36,54,43,114,0,4,10,7,17,5,-4,-20,-16,-14,-14,-25,-13,-20,-12,0,0,-4,-7,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. e4 Nf6 2. e5 Nd5 3. d4 d6 4. Nf3 Bf5 5. Be2 e6 6. O-O Be7 7. c4 Nb6 8. Nc3 O-O {B04: Alekhine's Defence: 4 Nf3} 9. b3 $146 ({Predecessor:} 9. Be3 dxe5 10. Nxe5 N8d7 11. Nf3 c6 12. Qd2 Nf6 13. h3 Ne4 14. Nxe4 Bxe4 15. b3 Nd7 16. Rfd1 Qc7 17. Bf4 Bd6 18. Bxd6 Qxd6 {1-0 (37) Seils,J (2365)-Hetey,L (2322) Rostock 2005}) 9... dxe5 10. Nxe5 N8d7 11. Nf3 Bf6 12. Be3 Nc8 13. Rc1 Ne7 14. Ne1 Bg6 15. g4 {[#] Strongly threatening g5.} h6 16. f4 c5 17. dxc5 Qc8 18. Na4 Rd8 19. Bd3 b6 {[#]} (19... Nb8 $14) 20. cxb6 (20. g5 $1 $16 {[%cal Rg5f6]} hxg5 21. fxg5) 20... Nxb6 $11 21. Nxb6 axb6 22. Qe2 Bd4 23. Bxd4 Rxd4 24. Bxg6 Nxg6 25. Ng2 $1 Qc5 {White must now prevent ...Rd2+.} 26. Kh1 Qc6 {next ...Nxf4 is good for Black.The position is equal.} 27. Kg1 Qc5 {aiming for ...Rd2+.} 28. Kh1 Rad8 29. Rcd1 Rxd1 30. Rxd1 Rxd1+ 31. Qxd1 Qf2 32. h4 e5 33. Qd8+ Kh7 34. Qd3 {Threatens to win with h5.} exf4 35. h5 f3 {[%csl Gf3][%cal Rf2g2]} 36. hxg6+ fxg6 {[%csl Gf3][%cal Rf2g2]} 37. Ne3 Qg3 38. Qf1 Qh4+ 39. Kg1 Qg3+ {Precision: White = 71%, Black = 63%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.13"]
[Round "8"]
[White "Praggnanandhaa, R."]
[Black "Michalik, Peter"]
[Result "0-1"]
[ECO "D78"]
[WhiteElo "2532"]
[BlackElo "2565"]
[Annotator "TA"]
[PlyCount "144"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,144,12,2,0,4,0,32,10,2,6,43,39,51,42,58,70,90,32,38,32,45,5,54,47,52,50,69,54,58,54,62,53,56,50,72,45,57,63,53,47,62,36,68,0,1,0,0,0,-11,-4,-1,-8,-8,-12,-8,-8,-6,-1,0,-22,-20,-83,-60,-60,-51,-101,-101,-165,-159,-178,-178,-178,-178,-199,-172,-207,-226,-226,-226,-300,-296,-288,-295,-449,-375,-376,-373,-547,-550,-512,-511,-396,-12,-308,-308,-297,-182,-181,-180,-175,-179,-271,-248,-273,-273,-266,-253,-312,-222,-222,-219,-272,-265,-29972,-29973,-29974,-29975,-29975,-29976,-29969,-29970,-29997,-29993,-29993,-29994,-29994,-29978,-29993,-29984,-29997,-29997]} 1. Nf3 d5 2. g3 g6 3. Bg2 Bg7 4. d4 Nf6 5. O-O O-O 6. c4 c6 7. Qb3 Qb6 8. Nc3 Rd8 9. Rd1 {D78: Fianchetto Grünfeld: 6 0-0 c6} (9. Bd2 dxc4 10. Qxc4 Be6 11. Qa4 Bf5 12. Rfe1 Ne4 13. Nxe4 Bxe4 14. Ba5 Qa6 15. Qa3 Re8 16. Bf1 c5 17. dxc5 Bxb2 {½-½ (17) Ding,L (2813)-Nepomniachtchi,I (2763) Wijk aan Zee 2019}) 9... Bf5 10. Ne1 Na6 11. Qxb6 {White is slightly better.} axb6 12. Na4 b5 13. cxb5 cxb5 14. Nb6 Ra7 15. Bf4 Nb4 {[#]} 16. a3 $146 ({Better is} 16. Bc7 $16 Re8 17. e3) ({Predecessor:} 16. Bc7 Re8 {½-½ (38) Yilmaz,M (2543)-Gagunashvili,M (2578) Konya 2012}) 16... Nc6 $14 17. e3 e6 18. f3 Ne8 19. g4 {[%mdl 64] Trapped Piece} Ra6 20. gxf5 gxf5 21. Nxd5 $1 Rxd5 22. Bg3 Rd8 23. Bf1 Rb6 24. Nd3 Na5 25. Bf2 Nc4 26. b3 Na5 27. Rab1 Nf6 28. Rdc1 Bh6 29. Rc5 (29. f4 $14) 29... Nc6 $11 30. Ne5 Nd5 31. Re1 ({Avoid the trap} 31. Rxb5 $2 Rxb5 32. Bxb5 Nxe5 $19) ({But not} 31. Bxb5 $2 Nxe5 32. dxe5 Rxb5 $1 $19 {[%mdl 512]}) 31... Nxe5 32. dxe5 Bf8 33. Rc2 Rc6 34. Rxc6 bxc6 35. a4 Bb4 $36 {[%mdl 2048] White is under pressure.} 36. Rc1 Nc3 37. axb5 cxb5 38. Ra1 (38. h3 $11) 38... Bc5 39. b4 Bxb4 {Strongly threatening ...Bc5.} 40. Be1 Nd5 41. Bxb5 (41. Bxb4 $17 Nxb4 42. Bxb5) 41... Bc5 $1 $19 42. Bh4 Rb8 43. Bc6 Nb4 44. Bd7 Nc2 45. Ra5 Bxe3+ 46. Kg2 Nd4 47. Bf6 h6 48. Ra2 Kh7 {Hoping for ...Rg8+.} 49. h4 (49. Kh3 $142) 49... h5 50. Kh3 Nxf3 51. Ra3 (51. Bc6 $142 Nd4 52. Ba8) 51... Ng1+ 52. Kg2 Rb2+ 53. Kf1 Rb1+ 54. Kg2 f4 $1 {( -> ...Rb2+)} 55. Bc6 {aiming for Be4+.} f3+ 56. Bxf3 Rb2+ 57. Kg3 Nxf3 58. Kxf3 {[%mdl 4096] Endgame KRB-KRB} (58. Rxe3 $142 Nd4 59. Ra3) 58... Bh6 $1 59. Ra7 Kg6 60. Ra8 {[#]} Kf5 $1 61. Rh8 Rb3+ 62. Ke2 Bf4 63. Rxh5+ Ke4 {...Rb2+ is the strong threat.} 64. Rh7 $2 (64. Rh8 $19) 64... Rb2+ {Black mates.} 65. Kd1 Kd3 {[%cal Rb2b1]} 66. Ke1 {[#]} Be3 $1 {[%cal Rb2b1]} 67. Kf1 Rf2+ 68. Ke1 Rf5 69. Bg5 Bd4 70. Bd2 Rxe5+ 71. Kd1 Re2 72. Bg5 Rh2 {Accuracy: White = 54%, Black = 79%.} 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.14"]
[Round "9"]
[White "Anton Guijarro, David"]
[Black "R Praggnanandhaa"]
[Result "1/2-1/2"]
[ECO "A21"]
[WhiteElo "2643"]
[BlackElo "2532"]
[Annotator "TA"]
[PlyCount "117"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,117,3,14,14,3,0,0,0,0,6,0,-4,-6,0,-6,0,90,51,82,85,97,86,81,70,154,112,112,87,241,224,216,213,219,226,186,195,254,208,246,171,178,143,153,150,145,145,145,147,152,144,175,169,178,161,157,164,179,181,174,166,241,240,238,228,227,225,346,243,274,281,298,254,312,243,251,235,232,222,246,222,211,80,106,108,108,95,118,100,115,76,86,66,76,0,86,66,57,37,39,22,22,11,13,14,25,11,13,18,31,16]} 1. c4 e5 2. Nc3 Bb4 3. Nd5 a5 4. Nf3 d6 5. a3 Bc5 6. e3 {A21: English Opening: 1...e5 2 Nc3} Nf6 7. d4 Nxd5 $1 8. cxd5 {The position is equal.} exd4 9. exd4 Bb6 10. Bg5 f6 11. Be3 $36 {[%mdl 2048] White has the initiative.} O-O 12. Bd3 $146 c6 (12... f5 $11 {keeps the balance.}) 13. Qc2 $16 f5 14. O-O h6 15. Rfe1 Kh8 16. dxc6 bxc6 (16... Nxc6 $14 17. d5 Bxe3 18. Rxe3 Ne7) 17. d5 {Black must now prevent Bxb6.} Bxe3 18. Rxe3 ({Much worse is} 18. fxe3 $6 cxd5 19. Nd4 Bd7 $14) 18... c5 $2 (18... f4 $16 19. Re2 cxd5) 19. Rae1 $18 Ra7 20. Bb5 {Hoping for Re8.} Qf6 21. Re8 Raf7 22. Qd2 f4 (22... Kh7 $142 23. Qxa5 Bd7) 23. Qxa5 Bg4 24. Qc3 {aiming for R1e6.} Nd7 25. Bxd7 Bxd7 26. Rxf8+ Rxf8 27. Qxf6 Rxf6 {[%mdl 4096] Endgame [#] KRB-KRN} 28. Nd2 $1 Rf5 29. Nc4 Ba4 30. Nb6 Bb3 31. f3 Bxd5 32. Rd1 Bb3 33. Rxd6 Re5 34. Kf2 c4 (34... Kh7 {keeps fighting.} 35. Rd8 g5) 35. Nd5 Rf5 36. Rd8+ Kh7 37. Nc3 Rh5 (37... Ra5 {was called for.} 38. Rd7 Kg8) 38. h3 Re5 39. Rd5 Re8 40. h4 Rb8 41. Ke1 Bc2 42. Rd2 Bf5 43. h5 g6 44. hxg6+ Kxg6 45. Kd1 (45. a4 $18) 45... Bd3 $16 46. Nd5 Kg5 {[#]} 47. Ke1 $1 Rb3 48. Nc3 h5 49. Kf2 Kf5 50. Na2 Bb1 51. Nc3 Bd3 52. Ne2 Rb7 53. Nc1 {Strongly threatening b4.} Bb1 54. Kg1 Ke5 55. Kf1 Bf5 56. Na2 Rb3 $1 57. Kf2 Bb1 58. Nc1 Rb7 59. Ne2 {Accuracy: White = 67%, Black = 56%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.14"]
[Round "9"]
[White "Jan Krejci"]
[Black "Wenjun Ju"]
[Result "1/2-1/2"]
[ECO "D38"]
[WhiteElo "2570"]
[BlackElo "2580"]
[Annotator "TA"]
[PlyCount "134"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,134,20,16,24,24,34,39,43,39,39,35,92,92,89,95,92,93,105,99,103,89,92,76,78,75,96,110,100,84,124,124,124,124,139,125,139,124,124,124,146,125,125,0,141,139,139,124,124,124,124,124,124,124,125,124,124,124,124,124,124,124,124,124,124,124,124,105,124,124,124,93,93,74,124,74,74,74,74,74,74,74,74,74,74,45,45,45,45,45,45,45,45,45,52,52,52,52,52,52,52,52,52,52,52,52,52,13,52,52,52,52,52,52,52,52,52]} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 Bb4 5. Bg5 h6 6. Bxf6 Qxf6 7. e3 O-O 8. Rc1 dxc4 9. Bxc4 c5 10. O-O cxd4 11. Nxd4 Qe7 {D38: Queen's Gambit Declined: Ragozin Defence (4 Nf3 Bb4)} (11... Bd7 12. Qb3 Nc6 13. Nxc6 Bxc3 14. Rxc3 Bxc6 15. Bb5 Bd5 16. Bc4 Bc6 17. Bb5 {½-½ (17) Matlakov,M (2709)-Dubov,D (2694) Moscow 2018}) 12. Qb3 Ba5 13. Rfd1 {[#]} Rd8 $146 ({Predecessor:} 13... a6 14. Be2 b5 15. Bf3 Ra7 16. a3 Bb7 17. Bxb7 Rxb7 18. Ne4 Rd8 19. Nf3 Rxd1+ 20. Qxd1 {½-½ (31) Socko,M (2445)-Khotenashvili,B (2504) Beijing 2012}) 14. Be2 Nd7 15. Ne4 Ne5 (15... Nf8 $14) 16. Rc5 $16 Bc7 17. Qc2 $36 {[%mdl 2048] Black is under strong pressure.} Nc6 18. Nxc6 bxc6 19. Rxc6 Bb6 20. Rxd8+ Qxd8 21. Bf3 Bb7 22. Rc3 Bxe4 23. Bxe4 Rb8 24. g3 Qf6 25. b4 g6 26. a4 Kg7 27. Kg2 h5 28. h4 Bd8 29. Rc4 Qe5 30. Rd4 Bb6 31. Rc4 Bd8 $1 32. Bf3 a6 33. Bc6 Be7 34. b5 axb5 35. axb5 Bd8 36. Re4 Qd6 37. Rd4 Qe5 38. Rd7 Bb6 39. Qd2 Kg8 40. Qd3 Qf6 41. Qe4 Kg7 42. Qb4 Qe5 43. Qa3 Bc5 44. Qd3 Bb6 45. Be4 {[#] Black must now prevent Bxg6.} Qf6 46. Qc2 Ba5 47. Bc6 Rd8 48. Rxd8 Qxd8 49. Qe4 Bb6 50. Qe5+ Qf6 51. Qb8 Qd8 52. Qxd8 (52. Qf4 {is interesting.} Kg8 53. Bf3 Qc7 54. Qa4 Qd6 55. Qa8+) 52... Bxd8 {[%mdl 4096] Endgame KB-KB} 53. Kf3 Kf6 54. Ke4 Bb6 55. f3 Ke7 56. Kd3 f5 57. Ke2 Bc7 58. Kf2 Bb6 59. Bb7 Bc5 60. Bc8 Bb6 61. Ke2 Bc7 62. f4 Bb6 63. Kd3 Bc5 64. Bb7 {White is slightly better.} Bb6 65. Bf3 Bc5 66. Bd1 Bb6 67. Bb3 Bc5 {Accuracy: White = 66%, Black = 68%.} 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.14"]
[Round "9"]
[White "Jiri Stocek"]
[Black "Thai Dai Van Nguyen"]
[Result "1/2-1/2"]
[ECO "A28"]
[Annotator "NA RC"]
[PlyCount "61"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "40/5400+30:1800+30"]

1. c4 Nf6 2. Nc3 e5 3. Nf3 Nc6 4. a3 d5 5. cxd5 Nxd5 6. Qc2 Nxc3 7. dxc3 Be7 8. e4 Be6 9. Be3 O-O 10. Rd1 Qe8 11. Nd2 f6 12. Bc4 Qf7 13. Bxe6 Qxe6 14. Qb3 Qxb3 15. Nxb3 Rad8 16. Ke2 b6 17. a4 Rxd1 18. Rxd1 Rd8 19. Ra1 Kf7 20. Nd2 g6 21. Nc4 a5 22. f4 Ke6 23. Rf1 exf4 24. Bxf4 Rd7 25. h3 Nd8 26. Nd2 Nf7 27. Nb3 c5 28. Nd2 Bd6 29. Be3 Be5 30. Nc4 Nd6 31. Nxd6 1/2-1/2

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.14"]
[Round "9"]
[White "Mateusz Bartel"]
[Black "David Paravyan"]
[Result "0-1"]
[ECO "A01"]
[Annotator "NA RC"]
[PlyCount "48"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "40/5400+30:1800+30"]

1. b3 e5 2. Bb2 Nc6 3. e3 g6 4. h4 Nf6 5. Nf3 e4 6. Ng5 d5 7. h5 Bh6 8. Nh3 O-O 9. hxg6 fxg6 10. Nc3 Be6 11. Ne2 Bg4 12. a3 Qd6 13. d4 exd3 14. Qxd3 Ne5 15. Qd4 Rae8 16. O-O-O c5 17. Qa4 d4 18. Nhf4 Bxf4 19. exf4 Nc6 20. f3 Be6 21. Qb5 Nd5 22. Qxb7 Nc7 23. b4 Rb8 24. bxc5 Qd7 0-1

[Event "Prague Festival Challengers 2019"]
[Site "Prague"]
[Date "2019.03.14"]
[Round "9"]
[White "Peter Michalik"]
[Black "Alexei Shirov"]
[Result "1/2-1/2"]
[ECO "C54"]
[Annotator "NA RC"]
[PlyCount "61"]
[EventDate "2019.03.06"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]
[TimeControl "40/5400+30:1800+30"]

1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. c3 Nf6 5. d3 O-O 6. O-O d5 7. exd5 Nxd5 8. Re1 Bg4 9. h3 Bh5 10. Nbd2 Nb6 11. Bb3 Qxd3 12. Nxe5 Qf5 13. Nef3 Rad8 14. g4 Bxg4 15. hxg4 Qxg4+ 16. Kh1 Qh3+ 17. Nh2 Bd6 18. f4 Bxf4 19. Re2 Ne5 20. Qf1 Qxf1+ 21. Ndxf1 Nd3 22. Bxf4 Nxf4 23. Re7 Nbd5 24. Re5 Rfe8 25. Rxe8+ Rxe8 26. Rd1 c6 27. Nf3 Kf8 28. Rd4 Re2 29. N1d2 f5 30. Bc4 Re7 31. Bxd5 1/2-1/2

