[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.12"]
[Round "1.1"]
[White "Nguyen, Thai Dai Van"]
[Black "Abasov, Nijat"]
[Result "1/2-1/2"]
[ECO "A37"]
[WhiteElo "2560"]
[BlackElo "2670"]
[Annotator "TA"]
[PlyCount "91"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,91,21,19,5,4,0,16,2,8,17,16,14,19,16,14,15,18,0,35,35,31,30,33,30,33,0,0,0,0,0,0,0,0,0,0,0,2,4,76,73,73,73,81,32,25,0,0,0,39,40,31,0,0,0,37,29,166,64,64,0,159,103,103,103,106,110,105,73,49,0,0,0,0,0,0,0,0,0]} 1. c4 c5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. Nf3 d6 6. O-O e6 7. e3 Nge7 8. d4 O-O 9. Rb1 {9.Re1 gains popularity. A37: Symmetrical English vs ...g6: 4 Bg2 Bg7 5 Nf3.} cxd4 10. exd4 d5 11. b3 b6 12. Ba3 Re8 {[#]} 13. Re1 $146 ({Predecessor:} 13. Nb5 Nf5 14. g4 a6 15. Nc7 Qxc7 16. gxf5 Qf4 17. fxg6 hxg6 18. Bc1 Qd6 19. Be3 {0-1 (42) Gajewski,G (2654)-Dominguez Perez,L (2732) Berlin 2015}) 13... a6 14. Ne5 Bb7 15. Rc1 Rc8 16. Nxc6 (16. cxd5 {with more complications.} Nxd5 17. Nxd5 exd5 18. Bb2 Qd6 19. Bh3) 16... Bxc6 (16... Rxc6 {keeps more tension.} 17. Qd2 Rc8 18. Na4 b5 19. Nc5 Ba8) 17. Bxe7 Rxe7 18. cxd5 Bxd5 19. Bxd5 {And now Bg2 would win.} Rec7 $1 20. Bxe6 fxe6 21. Ne2 Rxc1 22. Nxc1 Bxd4 23. Nd3 Rc3 24. Nf4 e5 25. Ne2 Rd3 26. Qc2 Kg7 (26... Bc5 $11) 27. Nxd4 $16 Qxd4 {[%mdl 4096] Endgame KQR-KQR} 28. Qc7+ Kf6 29. Qxh7 Rd2 $1 30. Qh8+ Kf7 $1 31. Qh7+ Kf6 32. Re3 {Rf3+ is the strong threat.} Qd5 $1 33. Qh8+ Kf7 34. Qh7+ Kf6 $1 35. Qh4+ Kf5 (35... Kf7 $1 $11 {and Black has nothing to worry.} 36. Re1 (36. Qh7+ Kf6 $14) 36... Qd4 37. Qxd4 (37. Qh7+ Kf6 $14) 37... exd4) 36. Qh3+ (36. Qb4 $1 $18) 36... Kf6 $14 {Hoping for ...Rd1+.} 37. Qh4+ ({White should play} 37. Re1 $1 $14) 37... Kf5 $16 {[#] ( -> ...Rd1+)} 38. Re1 (38. Qb4 $142 $1) 38... Qd4 39. Qh3+ Kf6 {[#]} 40. Qg2 $1 Rxa2 41. Qf3+ Kg7 42. h4 Ra1 $36 {[%mdl 2048] The position is equal. Black has good play.} 43. Rxa1 Qxa1+ 44. Kg2 {Threatens to win with Qb7+.} Qd4 $1 45. Qb7+ Kf6 46. Qc6+ {Accuracy: White = 72%, Black = 86%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.12"]
[Round "1.2"]
[White "Krejci, Jan"]
[Black "Cernousek, Lukas"]
[Result "1/2-1/2"]
[ECO "C01"]
[WhiteElo "2559"]
[BlackElo "2442"]
[Annotator "TA"]
[PlyCount "91"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,91,22,26,23,35,3,9,12,22,-3,0,-6,0,-7,0,-11,0,0,0,0,0,-9,13,0,27,45,68,71,69,68,58,16,17,0,12,0,0,0,43,0,0,0,18,31,58,60,47,61,66,54,64,58,62,8,8,8,15,0,12,15,19,35,16,20,49,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. e4 e6 2. d4 d5 3. exd5 exd5 4. Nf3 Nf6 5. Bd3 Bd6 6. Qe2+ Qe7 7. Qxe7+ Kxe7 8. O-O {C01: French: Exchange Variation.} Re8 9. Bg5 h6 10. Bh4 Nbd7 {[#]} 11. Nbd2 $146 ({Predecessor:} 11. Na3 c6 12. c3 Kf8 13. Rae1 Ne4 14. Bxe4 dxe4 15. Nd2 f5 16. Nac4 Bf4 17. Bg3 {1-0 (42) Kaczmarczyk,D (2411)-Sadeghi,H (2118) Switzerland 2017}) 11... Kf8 12. c4 g5 13. Bg3 Bxg3 14. fxg3 dxc4 15. Nxc4 Kg7 16. Rac1 $36 {[%mdl 2048] White has the initiative.} Nd5 17. h4 f6 18. Nfd2 Nf8 19. Be4 Ne7 20. Rfe1 Rb8 21. d5 {And now Bf3 would win.} Rd8 22. Ne3 c6 $1 23. Bf3 {[%cal Rd5c6]} Nfg6 (23... Be6 {keeps more tension.} 24. dxc6 Rxd2 25. c7 Re8 26. Nc4 Rd4) 24. Nb3 {[%cal Rd5c6]} gxh4 25. dxc6 Nxc6 26. Bxc6 bxc6 27. gxh4 Nxh4 28. Rxc6 Rd7 29. Rc4 Ng6 30. Nf5+ Kh7 31. Rc6 {Hoping for Nc5.} Rf7 32. Nd6 Bb7 33. Rc5 (33. Rc2 $14 Rd7 34. Ne8) 33... Rd7 $11 34. Ne8 Rf7 $1 35. Rf5 Nh4 36. Rxf6 Rxf6 37. Nxf6+ Kg6 38. Nd7 Rg8 39. Re2 (39. Re6+ {is more complex.} Kg5 40. g3 Bc8 41. Nbc5 Bxd7 42. Nxd7 Nf5 43. Re5) 39... Bxg2 {The position is equal.} 40. Rxg2+ Nxg2 41. Kxg2 Kf5+ 42. Kf3 Ke6 43. Ndc5+ Kd5 44. Nd3 Rf8+ 45. Kg4 Ke4 46. Nbc5+ {Accuracy: White = 82%, Black = 88%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.12"]
[Round "1.3"]
[White "Bartel, Mateusz"]
[Black "Esipenko, Andrey"]
[Result "1/2-1/2"]
[ECO "C77"]
[WhiteElo "2639"]
[BlackElo "2654"]
[Annotator "TA"]
[PlyCount "61"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,61,5,19,9,6,4,0,6,22,25,31,27,31,29,37,27,27,24,27,17,27,29,21,13,25,39,58,54,56,54,50,43,84,82,74,51,97,79,94,89,108,108,93,0,130,130,139,106,109,97,97,90,90,90]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. Nc3 Be7 6. Bxc6 {C77: Ruy Lopez: 3...a6 4 Ba4 Nf6, unusual lines.} dxc6 7. a3 O-O 8. d3 {[#] The position is equal.} Bg4 $146 ({Predecessor:} 8... Nd7 9. h4 Bf6 10. g4 g6 11. Be3 Qe7 12. Ng5 Bg7 13. Qd2 Nc5 14. h5 h6 {0-1 (61) Motylev,A (2668)-Inarkiev,E (2682) Izhevsk 2019}) 9. h3 Bxf3 $1 10. Qxf3 Nd7 11. Be3 Nc5 12. Qg3 f6 13. Qg4 Qc8 14. O-O-O Qxg4 15. hxg4 Ne6 16. g3 Rad8 17. f4 Bc5 18. Bxc5 Nxc5 19. Rdf1 Ne6 20. Nd1 g6 21. Ne3 b5 22. Rh6 Nd4 23. Kd1 a5 24. Rfh1 Rd7 25. f5 g5 26. b4 ({Better is} 26. b3 $16) 26... a4 (26... axb4 $11 27. axb4 Ra8) 27. Kc1 $16 Rff7 28. Kb2 Rd6 {White is better.} 29. Rd1 Rfd7 30. Rh2 Kh8 31. Kb1 {Accuracy: White = 90%, Black = 87%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.12"]
[Round "1.4"]
[White "Stefansson, Hannes"]
[Black "Kriebel, Tadeas"]
[Result "1-0"]
[ECO "B47"]
[WhiteElo "2529"]
[BlackElo "2524"]
[Annotator "TA"]
[PlyCount "95"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,95,23,14,29,12,15,8,10,12,46,0,33,0,0,0,0,0,0,0,0,0,0,0,0,-16,-24,-27,-8,-86,20,20,14,10,198,198,204,201,198,180,195,200,266,265,271,251,300,292,370,366,471,477,607,482,488,477,458,457,536,341,492,439,473,378,476,480,745,654,796,710,6318,6314,5477,6266,29955,6888,2888,2384]} 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Qc7 6. Be2 Nf6 7. O-O Be7 8. Be3 O-O 9. f4 d6 10. Kh1 Nxd4 11. Qxd4 e5 {B83: Sicilian Scheveningen: 6 Be2, lines without ...a6.} 12. Qd3 b6 {is the legacy move (12...a6).} 13. Rad1 Bb7 {The position is equal.} 14. Bf3 {[#]} Rad8 $146 ({Predecessor:} 14... Rac8 15. Rf2 Qc4 16. Rfd2 h6 17. Qxc4 Rxc4 18. fxe5 dxe5 19. Rd7 Nxd7 20. Rxd7 Bg5 {0-1 (32) Panagiotakos,N (2121)-Giannoulakis,L (2283) Pardubice 2015}) 15. f5 (15. Nb5 $5 {[%cal Rb5c7]} Qd7 16. c4 $14 (16. Nxa7 Bxe4 17. Bxe4 Qxa7 $14)) 15... Rfe8 16. Bf2 (16. Nb5 $5 {[%cal Rb5c7]} Qd7 17. c4 $14) 16... Qc8 17. Rfe1 Ba6 18. Qd2 d5 19. Nxd5 Nxd5 20. exd5 Qxf5 21. Re4 Bd6 22. Bh4 Rc8 23. Rde1 Qd7 24. Bh5 (24. g4 $11) 24... Rf8 (24... g6 $17 25. Be2 Bb7) 25. Bf6 $1 $11 {[#] Intending Qg5! and mate.} Qf5 $1 {[%cal Rf5f6]} ({Avoid the trap} 25... gxf6 $2 26. Rg4+ Qxg4 27. Bxg4 $18) 26. Bxe5 Rcd8 $2 (26... Bxe5 $11 27. Rxe5 Qxc2) 27. Bf3 Bxe5 28. Rxe5 $40 {[%mdl 128] White is out for blood.} Qf6 29. b3 Qd6 30. Re7 Bc8 31. Rxa7 Bd7 32. Qf2 f5 33. Rb7 Rf6 34. c4 Rh6 {[%csl Gh6][%cal Rd6h2]} 35. h3 Rf8 36. Qe3 Rhf6 37. Re2 Bc8 38. Re7 Qg3 39. Qf2 Qd6 (39... Qxf2 {might work better.} 40. Rxf2 R8f7) 40. Qh4 Bd7 41. R2e5 h6 42. b4 Ba4 (42... Rd8 $142 43. a3 f4) 43. a3 Bc2 44. R5e6 Qd8 {[#]} 45. Qg3 $1 {[%csl Ge7][%cal Rg3g7]} R6f7 46. Qe5 Be4 47. Rxf7 Kxf7 48. Bh5+ {Accuracy: White = 81%, Black = 45%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.12"]
[Round "1.5"]
[White "Piorun, Kacper"]
[Black "Van Foreest, Jorden"]
[Result "1/2-1/2"]
[ECO "B92"]
[WhiteElo "2611"]
[BlackElo "2667"]
[Annotator "TA"]
[PlyCount "103"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,103,0,0,44,45,49,48,53,22,35,27,46,45,71,71,81,67,65,71,66,66,66,66,65,55,76,54,87,71,118,56,68,28,79,79,68,80,79,76,86,90,97,77,124,120,109,27,39,46,35,6,8,0,0,0,0,4,8,0,18,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,-6,0,0,0,0,0,0,0,0,0,0]} 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Be2 e5 7. Nb3 Be7 8. O-O O-O 9. Kh1 b6 10. Be3 {10.f3 leads in the polls.} Bb7 11. f3 Nbd7 {B92: Sicilian Najdorf: 6 Be2.} 12. a4 Qc7 13. Qd2 Rfc8 {White is slightly better.} 14. Rac1 {[#]} Bc6 $146 ({Predecessor:} 14... Nf8 15. Rfd1 Ne6 16. Bf1 Bc6 17. Qf2 Rcb8 18. Nd5 Bxd5 19. exd5 Nc5 20. Nxc5 bxc5 {0-1 (41) Olsson,T (1996)-Tazbir,M (2524) Lund 2016}) 15. Rfd1 Rcb8 16. Ra1 h6 17. Nc1 Rd8 18. N1a2 d5 19. Nxd5 Nxd5 20. exd5 Nf6 {[%cal Rd8d5]} 21. c4 Bxa4 22. Rdc1 Bd7 23. Nc3 Bc5 24. Bd3 a5 {[#]} 25. Re1 (25. g4 $1 $16) 25... Re8 $14 26. Re2 Qd6 (26... Bb4 $11 {keeps the balance.}) 27. Bxc5 $16 Qxc5 28. Rae1 a4 29. Rxe5 Rxe5 30. Rxe5 a3 {Strongly threatening ...a2.} 31. Re1 h5 32. bxa3 Rxa3 33. Ne4 (33. Bf1 $16) 33... Nxe4 $11 34. Bxe4 {Hoping for Qg5.} ({Not} 34. Rxe4 $2 Ra1+ 35. Re1 Qd4 $19) 34... f5 $1 {[%cal Rf5e4]} 35. Bb1 {aiming for Qg5.} Qxc4 {The position is equal.} 36. Qg5 Qxd5 37. h3 Ra8 38. Re7 {[%csl Ge7][%cal Rg5g7]} Qd4 39. Kh2 Ra1 40. Qg6 {Re8+! would kill now.} Qf4+ 41. Qg3 $132 {[%mdl 2048] White is fighting back} Qxg3+ 42. Kxg3 Rxb1 43. Rxd7 {[%mdl 4096] Endgame KR-KR} Rb4 44. f4 Kh7 45. Rd6 g6 46. Rd7+ Kh6 47. h4 b5 48. Rb7 Rb1 49. Kh2 Rf1 50. g3 Rf2+ {[#]} 51. Kg1 $1 {[%mdl 512]} Rd2 52. Rxb5 {Accuracy: White = 83%, Black = 83%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.13"]
[Round "2.1"]
[White "Esipenko, Andrey"]
[Black "Stefansson, Hannes"]
[Result "1/2-1/2"]
[ECO "E20"]
[WhiteElo "2654"]
[BlackElo "2529"]
[Annotator "TA"]
[PlyCount "52"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,52,3,-13,-4,3,11,2,15,-23,9,7,59,19,37,0,-25,-52,52,-154,-58,-37,-63,-54,-9,-9,-20,-18,-12,-9,-9,-12,4,1,7,-34,-26,-99,-104,-107,-89,-96,-8,-8,-1]} 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.} 7. e5 Ne8 8. f4 d6 9. Nf3 dxe5 10. fxe5 Nd7 (10... f6 $11) 11. Bg5 {[#]} ({Of course not} 11. cxb5 Nxe5 12. Be2 (12. Nxe5 Qh4+ 13. Kd2 Qg5+ 14. Kc2 Qxe5 $17) 12... Ng6 $15) 11... Qa5 $146 ({Predecessor:} 11... f6 12. dxe6 fxg5 13. Qd5 Nc7 14. e7+ Nxd5 15. exd8=Q Rxd8 16. cxd5 g4 17. Nd2 Nxe5 18. Bxb5 Bxc3 19. bxc3 Rxd5 {½-½ (28) Olsen,F (2267)-Mortensen,R (1941) Runavik 2017}) 12. Qc2 ({Much weaker is} 12. cxb5 exd5 13. Be2 Bxc3+ 14. bxc3 Qxc3+ 15. Bd2 Qb2 $15) (12. Bd2 $14) 12... exd5 $1 $11 {And now ...d4 would win.} 13. cxd5 f6 (13... c4 $1 $15) 14. Bh4 $2 {[#]} (14. Bd3 $1 $14 {is the one way to stay ahead.} h6 15. e6 hxg5 16. O-O Bxc3 17. bxc3) 14... Nxe5 (14... c4 $1 $17 15. e6 Nb6) 15. Nxe5 $15 fxe5 16. Bd3 Nf6 (16... Kh8 $5 {[%cal Rc5c4]} 17. Bxh7 Nf6 18. Bxf6 Rxf6 $11) 17. O-O c4 $36 {[%mdl 2048] [#] Black has good play.} 18. Rxf6 $1 {[%mdl 512]} cxd3 ({Reject} 18... Rxf6 $6 19. Bxh7+ Kh8 20. Bxf6 $16) 19. Rxf8+ Bxf8 20. Qxd3 Qb6+ 21. Bf2 Bc5 22. Qd2 Bb7 23. Rd1 (23. Re1 $11) 23... Rf8 $17 24. Ne4 Bxf2+ 25. Nxf2 {[#]} Rd8 (25... e4 $1 $17 {[%cal Re4e3] Threatens to win with ...e3!} 26. Re1 Re8) 26. Qe2 Rxd5 {Accuracy: White = 62%, Black = 59%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.13"]
[Round "2.2"]
[White "Abasov, Nijat"]
[Black "Van Foreest, Jorden"]
[Result "1/2-1/2"]
[ECO "E62"]
[WhiteElo "2670"]
[BlackElo "2667"]
[Annotator "TA"]
[PlyCount "60"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 14,60,51,4,43,9,25,0,0,0,0,-10,-4,-4,0,-6,0,0,0,0,0,0,0,0,0,-12,-6,-13,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. c4 Nf6 2. g3 g6 3. Bg2 Bg7 4. Nc3 O-O 5. d4 d6 6. Nf3 Nc6 7. O-O e5 8. e3 {8.dxe5 is becoming the main line.} Bf5 {E62: King's Indian: Fianchetto: 6...c6 and Panno Variation (6...Nc6) without ...a6.} 9. b3 {[#]} (9. d5 $5 {[%cal Rd5c6]} Ne7 10. b3 $11) 9... a5 $146 ({Predecessor:} 9... Ne4 10. Ne2 Bg4 11. h3 Bxf3 12. Bxf3 Ng5 13. Bg2 exd4 14. exd4 Qf6 15. Bb2 Ne6 16. Rb1 Ncxd4 17. Nxd4 Nxd4 18. Bxb7 {½-½ (32) Votava,J (2521)-Rasik,V (2447) Czech Republic 2016}) 10. Bb2 Re8 {The position is equal.} 11. a3 exd4 12. Nxd4 Nxd4 13. exd4 c6 14. d5 Ne4 15. Bxe4 Bxe4 16. Nxe4 {[#] aiming for Bxg7.} Bxb2 17. Ra2 Rxe4 18. Rxb2 Qf6 19. Re2 (19. Rd2 {keeps more tension.} c5 20. Re2 Rae8 21. Rxe4 Rxe4 22. Re1) 19... Rxe2 20. Qxe2 $11 {[%mdl 4096] Endgame KQR-KQR} a4 21. dxc6 bxc6 22. bxa4 Rxa4 23. Qe8+ Kg7 24. Qxc6 Rxa3 25. c5 dxc5 26. Qxc5 Qc3 27. Rc1 Qxc5 28. Rxc5 h5 29. h4 Ra8 30. Kg2 Rb8 {Accuracy: White = 85%, Black = 93%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.13"]
[Round "2.3"]
[White "Cernousek, Lukas"]
[Black "Bartel, Mateusz"]
[Result "1/2-1/2"]
[ECO "C47"]
[WhiteElo "2442"]
[BlackElo "2639"]
[Annotator "TA"]
[PlyCount "98"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 22,98,26,10,2,-20,7,8,8,7,2,1,1,9,2,0,0,-6,-2,-6,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-8,-8,-8,-8,-8,-8,-20,-3,-92,-100,-90,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nxd4 Bb4 6. Nxc6 bxc6 7. Bd3 O-O 8. O-O Re8 9. Bg5 h6 10. Bh4 g5 11. Bg3 Bxc3 12. bxc3 {[#] e5 is the strong threat.} Nxe4 {C47: Scotch Four Knights and Four Knights with 4 g3.} 13. f4 d6 14. Qh5 {Strongly threatening fxg5.} Bf5 15. fxg5 Bg6 $1 {[%cal Rg6h5]} 16. Qxh6 Qxg5 17. Qxg5 Nxg5 {[#]} 18. Rab1 $146 ({Predecessor:} 18. c4 Ne4 19. Be1 Re5 20. Rf4 Rae8 21. Rh4 Nc5 22. Bc3 Nxd3 23. cxd3 Rh5 24. Rg4 {½-½ (32) Filippov,A (2617)-Saric,I (2637) Sibenik 2012}) 18... Rab8 19. Rb4 Ne4 20. Be1 a5 21. Rxb8 Rxb8 22. c4 a4 23. Ba5 Rb2 24. Re1 Nc5 25. Bc3 {White threatens Re8+ and mate.} Rb8 26. Bxg6 fxg6 $11 {[%mdl 4096] Endgame KRB-KRN} 27. Bd4 Rb4 28. Bxc5 dxc5 {KR-KR} 29. Re6 Kf7 30. Rxc6 {[%mdl 64] [#] Double Attack} Rxc4 31. Rxc7+ Ke6 32. Rc6+ Kf5 33. Kf2 (33. h4 $11) 33... Rxc2+ $17 34. Ke3 a3 ({But not} 34... Rxa2 $6 35. Rxc5+ Kf6 36. Rc6+ Kg7 37. Kf3 $11) (34... Rxg2 $17 35. Rxc5+ Kf6) 35. h4 $11 {The position is equal.} c4 ({Don't play} 35... Rxa2 36. Rxc5+ Kg4 37. Rc4+ Kg3 38. Rc6 $17) 36. g4+ Ke5 37. Rxg6 Rxa2 {White must now prevent ...Ra1.} 38. Rg5+ Ke6 39. Ra5 Ra1 {Threatens to win with ...a2.} 40. Kd2 a2 41. Kc2 Rg1 42. Rxa2 Rg2+ 43. Kb1 Rxg4 44. Rh2 Kf6 45. Kc2 Kg6 46. h5+ Kh6 47. Kc3 Rg5 48. Kxc4 Rxh5 49. Rxh5+ Kxh5 {Accuracy: White = 93%, Black = 93%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.13"]
[Round "2.4"]
[White "Kriebel, Tadeas"]
[Black "Piorun, Kacper"]
[Result "0-1"]
[ECO "E91"]
[WhiteElo "2524"]
[BlackElo "2611"]
[Annotator "TA"]
[PlyCount "106"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 16,106,14,-4,83,8,25,29,24,22,29,25,21,22,43,39,31,37,29,44,50,46,45,41,43,36,90,69,74,73,75,75,75,67,102,69,120,73,71,60,95,52,67,55,57,56,66,57,70,58,84,61,114,114,118,97,111,73,95,88,90,68,70,66,70,68,74,0,0,0,0,0,2,0,0,0,0,0,0,0,0,-140,-139,-169,-187,-185,-176,-249,-235,-29990,-29989,-29989,-29990]} 1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. Nf3 O-O 6. Be2 Bg4 7. O-O Nfd7 8. h3 Bxf3 9. Bxf3 c5 {E91: King's Indian: Classical: 6 Be2, unusual replies including 6...c5 and 6...Bg4.} (9... Nc6 $11 {remains equal.}) 10. e5 {[#]} (10. d5 $1 $16) 10... cxd4 $146 (10... Nc6 {is interesting.} 11. exd6 cxd4 12. dxe7 Qxe7 13. Nd5 Qc5) ({Predecessor:} 10... Qc8 11. Nd5 Nc6 12. Bg5 f6 13. exf6 Nxf6 14. dxc5 dxc5 15. Re1 e6 16. Bxf6 Bxf6 17. Bg4 {1-0 (31) Bosnak,D-Cicek,F (1433) Antalya 2019}) 11. Bxb7 {Nd5 is the strong threat.} dxc3 {White has an edge.} 12. Bxa8 Nxe5 13. bxc3 Nxc4 14. Rb1 Nd7 15. Bd5 $36 {[%mdl 2048] Black is under pressure.} Ncb6 16. Bg5 h6 17. Be3 Qc7 18. Bb3 Nc5 19. Qf3 e6 20. c4 a5 ({Better is} 20... Rc8 $14) 21. Rfc1 Nbd7 22. Bc2 Ne5 23. Qe2 Nc6 24. a3 h5 25. Rd1 Rd8 (25... Bf6 $14) 26. f4 Bf6 27. Kh1 h4 28. Qf3 Kg7 29. Bf2 a4 30. Qg4 Rh8 31. Qe2 Na5 32. Rb5 Nab3 33. Qg4 Qe7 (33... Rh5 $14) 34. Rb6 Rd8 35. Qf3 Na5 36. Rb4 Rc8 37. Qe2 Nc6 38. Rb6 Qc7 39. Rb5 Na7 40. Rbb1 Nc6 41. Bxc5 (41. Qe1 $16) 41... dxc5 $11 42. Qe4 Kf8 43. Bxa4 {Strongly threatening Qxc6.} Nd4 44. Rb7 Qa5 $1 {[%cal Ra5a4]} 45. Bd7 Rc7 46. Rxc7 Qxc7 47. Bb5 Nf5 {White must now prevent ...Ng3+.} 48. Qf3 (48. Kg1 $1 $11) 48... Bd4 $1 $17 {[%mdl 1024] Black has strong compensation.} 49. a4 Be3 $1 50. Rd7 {[#]} Qb8 $1 51. Rb7 {[#]} (51. Rd3 $142 Ng3+ 52. Kh2 Bxf4 53. Kg1) 51... Qd8 $1 $19 {[%cal Rd8d2] ( -> ...Qd2)} 52. Kh2 $2 (52. Bd7 $19 Qf6 53. Rb1) 52... Qd4 53. Rd7 Bxf4+ {Accuracy: White = 69%, Black = 80%.} 0-1

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.13"]
[Round "2.5"]
[White "Nguyen, Thai Dai Van"]
[Black "Krejci, Jan"]
[Result "1/2-1/2"]
[ECO "A14"]
[WhiteElo "2560"]
[BlackElo "2559"]
[Annotator "TA"]
[PlyCount "89"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 21,89,6,6,9,16,0,0,0,2,0,0,0,8,7,42,42,42,25,25,25,28,21,23,22,29,17,36,21,31,9,17,18,39,0,20,0,39,33,39,39,39,39,39,39,64,39,39,39,39,39,39,39,33,39,39,39,39,0,34,0,39,34,34,35,35,32,35,27,26,21]} 1. c4 Nf6 2. Nf3 e6 3. g3 d5 4. Bg2 Be7 5. O-O O-O 6. d4 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. Rfe1 {13.Rfd1 is setting a new trend.} Bxf3 14. Bxf3 {The position is equal.} c6 15. a5 {[#]} Qd6 $146 ({Predecessor:} 15... Rc8 16. e3 Qc7 17. Qb3 Rb8 18. Rec1 Rfd8 19. Kg2 Bf8 20. h4 h5 21. Ne2 g6 {1-0 (67) Onischuk,A (2627)-Shneider,A (2542) Bastia 2000}) 16. e3 Rad8 17. Red1 Rd7 18. Na4 Qb8 19. Nb6 Rdd8 20. Qb3 Nd5 21. Nc4 Nc7 22. h4 Nb5 23. Kg2 Bf6 24. Qc2 Rfe8 25. h5 Nd6 26. Nb6 Nc8 27. Nc4 Nd6 28. Nb6 {[%cal Bc4b6,Bb6a4,Ba4c5][%mdl 32]} Nc8 29. Na4 Qc7 30. Nc5 Qe7 31. Rac1 Nd6 32. b4 Nb5 33. Qb3 Qc7 34. Be4 Be7 35. Nd3 Nd6 36. Bf3 Nb5 37. Be2 Qd6 38. Nc5 Qb8 39. Nd3 Qd6 40. Nc5 Qc7 (40... Qb8 {keeps more tension.}) 41. Ne4 Nd6 42. Nc3 Qd7 43. Bf3 Nb5 44. Nxb5 cxb5 45. e4 {Accuracy: White = 94%, Black = 91%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.14"]
[Round "3.1"]
[White "Piorun, Kacper"]
[Black "Esipenko, Andrey"]
[Result "0-1"]
[ECO "C78"]
[WhiteElo "2611"]
[BlackElo "2654"]
[Annotator "TA"]
[PlyCount "128"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,128,38,44,13,6,19,17,15,25,8,16,1,0,6,10,14,7,2,36,0,51,51,48,56,54,2,7,15,66,82,81,77,102,95,139,152,206,200,202,204,239,244,261,172,162,175,242,229,302,303,360,186,173,158,150,50,42,46,214,222,185,0,0,0,52,0,19,19,19,30,22,22,22,22,22,37,51,56,47,0,0,-54,-31,-564,-564,-562,-560,-554,-546,-967,-966,-968,-930,-883,-801,-822,-797,-1512,-1302,-1130,-1113,-29988,-29989,-29989,-29987,-29987,-29983,-29988,-29989,-29989,-29990,-29990,-29988,-29990,-29990]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O b5 6. Bb3 Bc5 7. a4 Rb8 8. axb5 axb5 {[#]} 9. Nxe5 $1 {[%mdl 576] Remove Defender. C78: Ruy Lopez: Archangelsk and Möller Defences.} Nxe5 10. d4 {[#]} Bxd4 $1 {[%mdl 512]} 11. Qxd4 {The position is equal.} d6 12. f4 Nc6 13. Qc3 {aiming for e5.} Ne7 14. e5 Ne4 $1 {[%cal Re4c3]} 15. Qe1 Nc5 16. Ba2 $36 {[%mdl 2048] Black should prevent f5! White is more active.} Bf5 {[#]} 17. Be3 $5 $146 {[%mdl 8] An interesting novelty.} ({Predecessor:} 17. Nc3 b4 18. Nd5 b3 19. Nxe7 Qxe7 20. exd6 Qxe1 21. Rxe1+ Kd7 22. Bxb3 Nxb3 23. cxb3 Kxd6 {½-½ (33) Heberla,B (2546)-Shirov,A (2639) Sweden 2018}) 17... Ne6 (17... O-O $11) 18. exd6 $14 Qxd6 19. Qf2 O-O 20. Bb3 (20. h3 $14) 20... Rfd8 $11 21. Nc3 Qc6 (21... Nd4 $11) 22. h3 $14 h5 23. Ra5 Qe8 24. Re1 c6 25. Qh4 Ng6 (25... Bg6 $16 26. g4 c5 27. Bxe6 (27. gxh5 Nf5 $16) 27... fxe6) 26. Qxh5 $18 Nd4 27. Ra7 Nxb3 28. Bf2 $1 ({Weaker is} 28. Qxf5 Nd4 $14) (28. cxb3 $6 Rd3 $16) 28... Qf8 29. cxb3 Bc2 30. f5 Nf4 (30... b4 $142) 31. Qf3 Nd5 {[%cal Bf4d5,Bd5b4,Bb4c2,Bc2d4][%mdl 32]} 32. Rc1 Nb4 33. Rxc2 (33. Na2 $142) 33... Nxc2 34. Ne4 $1 ({Not} 34. Qxc6 Nd4 $15) 34... Ra8 {[#] Strongly threatening ...Rxa7.} 35. Bc5 (35. Qg4 $1 $16 {[%mdl 512] Intending Nf6+ and mate.} f6 36. Rc7) 35... Qxc5+ $1 $14 36. Nxc5 Nd4 $2 (36... Rxa7 $14 37. Qe4 Nd4) 37. Qg4 $18 Rxa7 {[#]} 38. f6 $2 ({White must play} 38. Ne4 $1 $18) 38... g6 $1 $11 {Hoping for ...Nf5.} 39. Kh2 Nf5 ({Better is} 39... Raa8 $11) 40. Qe2 (40. Qf4 $14) 40... Ra1 41. g4 Rh1+ 42. Kg2 Rhd1 $1 {[%cal Rd1d2]} 43. Ne4 ({Don't go for} 43. gxf5 $2 R1d2 $19) 43... Nh4+ $1 44. Kg3 g5 $1 45. Nxg5 Ng6 46. Nf3 $1 R1d6 $1 47. Qe3 {Threatens to win with Qg5.} Rxf6 48. h4 ({White should play} 48. Qg5 $11 Rdd6 49. Nd4) 48... Re6 $1 $15 {[%cal Re6e3]} 49. Qg5 $2 {[%mdl 8192]} (49. Qc3 $1 $15) 49... Rd5 $19 50. Qc1 Rd3 51. Kg2 {intending h5.} Rf6 {And now ...Nf4+ would win.} 52. Ng5 Nxh4+ 53. Kg1 Rg3+ 54. Kh2 Rxg4 {( -> ...Rg6)} 55. Kh3 Rgf4 56. Qe1 Ng6 57. Qe8+ Kg7 58. Nxf7 Rxf7 {Black mates.} 59. Qxc6 Rf3+ 60. Kh2 Rxb3 61. Kg1 Rg3+ 62. Kh2 Rg5 63. Qc3+ Ne5 64. b4 Kh8 {Accuracy: White = 58%, Black = 78%.} 0-1

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.14"]
[Round "3.2"]
[White "Bartel, Mateusz"]
[Black "Nguyen, Thai Dai Van"]
[Result "1/2-1/2"]
[ECO "D30"]
[WhiteElo "2639"]
[BlackElo "2560"]
[Annotator "TA"]
[PlyCount "91"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,91,-10,10,8,9,9,7,9,19,19,14,14,19,-22,-23,-21,-18,-21,-23,-23,-23,-12,-25,-18,-17,-16,-16,-32,-10,-14,-2,-15,-7,-7,-13,-46,0,0,0,-7,12,8,8,8,8,8,13,15,18,7,7,7,7,7,7,6,8,8,8,8,8,8,8,8,6,6,10,8,17,0,0,0,8,8,8,8,8,8,8,8,8,0,0,0]} 1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Bg5 dxc4 5. e4 c5 6. Nc3 {D30: Queen's Gambit Declined: Systems without Nc3.} cxd4 7. Qxd4 Qxd4 8. Nxd4 Bb4 9. f3 Bd7 10. Bxc4 O-O {[#]} 11. O-O-O $146 ({Predecessor:} 11. Nde2 Rc8 12. Bb3 Nc6 13. O-O-O Be8 14. a3 Bf8 15. Kb1 b5 16. Rc1 Rab8 17. Na2 {½-½ (30) Diermair,A (2508)-Schnider,G (2422) Vienna 2018}) 11... Rc8 {[#] aiming for ...Bxc3.} 12. Be2 Bxc3 13. bxc3 Rxc3+ 14. Kb2 Rc8 15. Rc1 Rxc1 16. Rxc1 Nc6 17. Nb5 Kf8 18. g4 h6 19. Be3 b6 20. h4 Ke7 21. g5 hxg5 22. Bxg5 Kf8 (22... a6 $5 {[%cal Ra6b5]} 23. Nc3 b5 $11) 23. Rd1 {[#] Hoping for Bxf6.The position is equal.} Be8 24. Nd6 e5 25. Bxf6 gxf6 26. Bb5 Nd4 27. Nxe8 Nxb5 28. Nxf6 $11 {[%mdl 4096] Endgame KRN-KRN} Ke7 29. Nd5+ Kf8 $1 30. h5 {Strongly threatening h6.} Kg7 31. Rg1+ Kh6 32. Nf6 Nd4 33. Ng4+ Kxh5 34. Nxe5 f6 35. Nd7 Nxf3 36. Nxf6+ Kh6 37. Rg3 Nd4 38. Rd3 Kg6 39. Nd7 Ne6 40. Rd6 Kf7 41. Ne5+ Ke7 42. Rd7+ Kf6 43. Nc6 Nc5 44. e5+ Kf5 45. Rf7+ Ke4 46. Rxa7 {Accuracy: White = 97%, Black = 97%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.14"]
[Round "3.3"]
[White "Stefansson, Hannes"]
[Black "Cernousek, Lukas"]
[Result "1-0"]
[ECO "C11"]
[WhiteElo "2529"]
[BlackElo "2442"]
[Annotator "TA"]
[PlyCount "101"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 23,101,0,16,4,22,16,11,12,5,18,1,10,27,0,0,0,-12,-34,-32,-39,-30,-64,-64,-66,-68,-73,-75,-68,-81,-72,-79,-79,-67,-69,-77,-75,-73,-103,-97,-95,-77,-99,-67,-75,-12,-33,-27,-14,-12,-12,-10,-60,-51,-59,-58,-39,167,172,172,172,172,174,174,174,175,129,541,668,554,420,1193,1080,1195,1047,5527,5206,6079,6033,1401,1327]} 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 cxd4 8. Nxd4 Qb6 9. Qd2 Qxb2 10. Rb1 Qa3 11. Bb5 Nxd4 12. Bxd4 Bb4 13. Rb3 {C11: French: Classical System: 4 e5 and 4 Bg5 dxe4.} Qa5 14. a3 Be7 15. f5 {The position is equal.} exf5 16. Nxd5 Qxd2+ 17. Kxd2 Bd8 {[#]} 18. Rf1 $1 $146 {[%mdl 8] An important novelty.} ({Predecessor:} 18. Rc3 Ba5 19. Nc7+ Bxc7 20. Rxc7 Kd8 21. Rc3 Nf8 22. Bc5 Bd7 23. Bxf8 Bxb5 24. Bxg7 {1-0 (37) Svidler,P (2735)-Meier,G (2628) Karlsruhe/Baden Baden 2019}) 18... a6 19. Bd3 Nf8 20. Bb6 {[#] Threatens to win with Bxd8.} Be6 $36 {[%mdl 2048] Black is more active.} 21. c4 Nd7 22. Bxd8 Rxd8 23. Rxb7 O-O $1 {aiming for ...Bxd5.} 24. Bxf5 Nxe5 25. Kc3 Bxd5 26. cxd5 Rxd5 27. Rc7 g6 28. Bc2 Rfd8 29. Re1 Kg7 30. Re2 h5 31. Bb3 Rb5 {Hoping for ...Rd3+.} 32. Kc2 Rd7 (32... Rdb8 {feels hotter.} 33. Rc3 f6 34. Rd2 R5b6 35. g3 Ng4) 33. Rxd7 {[#]} Nxd7 $15 {[%mdl 4096] Endgame KRB-KRN} (33... Rc5+ $1 $17 34. Kd2 Nxd7) 34. Re7 $11 Ne5 35. Kc3 Kf6 36. Ra7 Rc5+ 37. Kd4 (37. Kb4 $5 {[%cal Rb4c5]} Rc6 38. Ka5 $11) 37... Ra5 {White must now prevent ...Nc6+.} 38. Rb7 Nc6+ 39. Kc3 Ne5 $2 (39... Nd8 $15 {stays ahead.} 40. Rb6+ Ne6) 40. Rb6+ $18 Ke7 41. Kb4 Rb5+ 42. Rxb5 axb5 43. Kxb5 {KB-KN} Kd6 44. a4 f5 $2 {[%mdl 8192]} (44... Kc7 $16 {is a better chance.} 45. Bd5 Kd6) 45. h4 Kc7 46. Kc5 Kb7 (46... Nd3+ $142 47. Kd4 Ne1) 47. Bd5+ {White is clearly winning.} Ka6 48. Kd4 Nd7 49. Bf7 Nf8 50. Ke5 Ka5 51. Be8 {Accuracy: White = 84%, Black = 66%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.14"]
[Round "3.4"]
[White "Krejci, Jan"]
[Black "Abasov, Nijat"]
[Result "1/2-1/2"]
[ECO "E21"]
[WhiteElo "2559"]
[BlackElo "2670"]
[Annotator "TA"]
[PlyCount "67"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,67,11,0,0,7,15,9,0,10,0,0,0,-7,-4,0,0,15,9,16,17,25,14,16,28,42,27,46,37,47,35,64,17,14,13,22,22,0,4,19,15,27,8,27,18,19,26,29,41,40,40,41,0,41,0]} 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Nf3 b6 5. Bd2 Bb7 6. e3 O-O 7. Bd3 d5 8. cxd5 exd5 9. Rc1 {E52: Nimzo-Indian: Rubinstein: 4...0-0 5 Nf3 d5 6 Bd3 b6.} Be7 $1 {[%mdl 4] is more profitable than 9...a6 at the moment.} 10. O-O c5 11. Ne5 {The position is equal.} Nc6 12. Nxc6 Bxc6 13. dxc5 bxc5 14. Ne2 {[#]} Rb8 $146 ({Predecessor:} 14... Qb6 15. Bc3 Bb7 16. Ng3 Rfd8 17. Nf5 Bf8 18. Qa4 Qe6 19. Qh4 Ne4 20. f3 Qxf5 21. fxe4 {1-0 (36) Sek,Z-Goebel,W ICCF corr 1986}) 15. Bc3 Qd6 16. b3 Rfe8 ({But not} 16... d4 17. exd4 Qd5 18. f3 $16) 17. Qc2 g6 18. Rfd1 Ng4 19. Ng3 $1 Ba8 20. Be2 Qe6 21. Ba1 Ne5 22. Bf1 Nd7 23. Qc3 {[%csl Ga1][%cal Rc3h8] [#]} Bf6 24. Qa5 Qb6 25. Qa4 Bxa1 26. Rxa1 Nf6 27. Rac1 a5 28. Be2 Rbc8 29. Qb5 Re6 30. Rc2 Qa7 31. Rdc1 {[%cal Rc2c5]} Rec6 32. Qa4 Qb6 33. Qb5 Qa7 34. Qa4 {Accuracy: White = 94%, Black = 95%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.14"]
[Round "3.5"]
[White "Van Foreest, Jorden"]
[Black "Kriebel, Tadeas"]
[Result "1/2-1/2"]
[ECO "D02"]
[WhiteElo "2667"]
[BlackElo "2524"]
[Annotator "TA"]
[PlyCount "82"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,82,0,0,0,7,0,0,10,8,8,15,10,0,0,31,6,0,0,6,0,41,33,40,0,0,0,33,0,0,-90,-89,-95,-93,-87,-92,-114,-108,-116,-112,-117,-121,-113,-122,-118,-116,-117,-102,-145,-139,-147,-150,-134,-141,-154,-156,-144,-142,-120,-90,-90,-90,-99,-39,-39,-39,-39,0,0,0,0,0,0,0]} 1. d4 Nf6 2. Nf3 d5 3. Bf4 e6 4. e3 Bd6 5. Ne5 O-O 6. Nd2 c5 7. c3 {D02: 1 d4 d5 2 Nf3 sidelines, including 2...Nf6 3 g3 and 2...Nf6 3 Bf4.} b6 8. h4 Qc7 9. h5 {[#]} Nbd7 $146 {[%cal Rd7e5]} ({Predecessor:} 9... Nc6 10. Nxc6 Qxc6 11. h6 g6 12. Qf3 Bxf4 13. Qxf4 Nd7 14. Nf3 f6 15. Qg3 c4 {1-0 (47) Naiditsch,A (2687)-Halkias,S (2585) Doha 2016}) 10. Ndf3 {[%cal Bd2f3,Bf3e5,Be5g4,Bg4e3][%mdl 32]} cxd4 (10... h6 {keeps more tension.} 11. Bd3 Bb7 12. g4 cxd4 13. cxd4 Rfc8) 11. exd4 Ne4 12. Bd3 Nxe5 13. Bxe5 Bxe5 14. Nxe5 f6 $36 {[%mdl 2048] Black has the initiative.} 15. Ng4 e5 16. Ne3 exd4 17. cxd4 (17. Bxe4 $5 dxe4 18. Qxd4 $11) 17... Qf4 {[%csl Ge4][%cal Rf4f2] [#]} 18. Bxe4 Qxe4 19. h6 Ba6 20. Qg4 (20. hxg7 $11 Rfe8 21. Rc1 (21. Qh5 $2 Rac8 $19)) 20... Qxg4 $17 21. Nxg4 Rfe8+ 22. Ne3 {[#]} Rac8 $1 {[%cal Rc8c2] ...Rc2 is the strong threat.} 23. Kd2 Re4 24. Rhd1 Rxd4+ 25. Ke1 Rh4 {And now ...d4 would win.} 26. f3 Rxh6 27. Kf2 Rh5 28. Rd4 Re5 29. a4 Bb7 30. Rad1 Rce8 31. R1d3 h5 32. b4 Kf7 33. Nxd5 Bxd5 34. Rxd5 Rxd5 35. Rxd5 {[%mdl 4096] Endgame KR-KR} g5 36. a5 bxa5 (36... Ke6 $17 37. Rb5 bxa5 38. Rxa5 Rb8) 37. Rxa5 $15 Re7 38. f4 gxf4 39. Rxh5 {The position is equal.} Re4 40. Rh7+ Kg6 41. Rxa7 Rxb4 {Accuracy: White = 81%, Black = 84%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.15"]
[Round "4.1"]
[White "Nguyen, Thai Dai Van"]
[Black "Stefansson, Hannes"]
[Result "1/2-1/2"]
[ECO "C43"]
[WhiteElo "2560"]
[BlackElo "2529"]
[Annotator "TA"]
[PlyCount "92"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 17,92,0,2,0,0,0,20,20,31,26,16,7,13,0,57,19,19,14,19,19,19,19,19,19,24,19,75,58,58,19,19,19,19,11,11,11,9,11,10,10,7,2,1,4,4,4,4,4,4,4,4,0,1,0,0,0,24,0,0,0,0,0,0,-116,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. e4 e5 2. Nf3 Nf6 3. d4 Nxe4 4. Bd3 d5 5. Nxe5 Nd7 6. Nxd7 Bxd7 7. O-O Bd6 8. Nc3 Nxc3 9. bxc3 O-O {[#]} 10. Qh5 $1 {[%csl Gd3][%cal Rh5h7][%mdl 512] C43: Petroff Defence: 3 d4.} f5 $1 11. Re1 {11.Rb1 is not played anymore.} Qf6 12. Qf3 c6 13. Bf4 Rae8 14. h4 {[#]} Re6 $146 ({Predecessor:} 14... g6 15. Qg3 Bxf4 16. Qxf4 Rxe1+ 17. Rxe1 Re8 18. Rxe8+ Bxe8 19. Qb8 Kf8 20. Qxa7 Qxh4 21. Qxb7 {1-0 (43) Zhigalko,S (2641)-Ladva,O (2522) Katowice 2017}) 15. a4 Rfe8 ({Better is} 15... Qxh4 $11 16. Rxe6 Bxf4) 16. Rxe6 Qxe6 17. Qg3 Bxf4 18. Qxf4 Qf7 19. Rb1 Bc8 20. a5 a6 21. Kf1 Kf8 (21... Qe6 $11) 22. g3 h6 23. Kg2 Kg8 24. Rh1 Qe7 25. c4 Qb4 26. cxd5 cxd5 27. Ra1 Qb2 28. Rc1 Qc3 29. Rb1 Qxa5 30. Bxf5 Qd8 $1 {White should prevent ...Rf8.} 31. Bg6 Rf8 $132 {[%mdl 2048] Black has counterplay} 32. Qe5 Qf6 33. Qxf6 Rxf6 $11 {[%mdl 4096] Endgame KRB-KRB} 34. h5 b5 35. Re1 Be6 36. f4 a5 37. Ra1 a4 38. Be8 Bf5 {Threatens to win with ...Rb6.} 39. Bxb5 {aiming for c4.} Bxc2 40. Rc1 ({Don't play} 40. Bxa4 Ra6 $17) (40. Ra2 $11 {keeps the balance.} Bb3 41. Ra3) 40... Rb6 (40... Be4+ $17 41. Kf2 a3) 41. Rxc2 {The position is equal.} Rxb5 {KR-KR} 42. Rc8+ Kf7 43. Ra8 Rb4 44. Kf3 Rxd4 45. Ra7+ Kf6 46. Ra6+ Kf7 {Accuracy: White = 90%, Black = 90%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.15"]
[Round "4.2"]
[White "Cernousek, Lukas"]
[Black "Piorun, Kacper"]
[Result "1/2-1/2"]
[ECO "B40"]
[WhiteElo "2442"]
[BlackElo "2611"]
[Annotator "TA"]
[PlyCount "149"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 16,149,7,6,32,32,32,32,45,37,73,68,68,74,83,35,35,27,28,33,38,33,73,87,82,68,60,25,24,35,33,8,12,8,43,38,48,0,40,0,28,14,20,18,58,33,39,0,0,0,0,0,0,0,0,0,0,-3,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. e4 c5 2. Nf3 e6 3. c4 Nc6 4. d4 cxd4 5. Nxd4 Nf6 6. Nc3 Bb4 7. Nxc6 bxc6 8. Bd3 e5 9. O-O Bc5 {B44: Sicilian: Taimanov: 5 Nb5.} 10. Re1 {[#]} d6 $146 ({Predecessor:} 10... O-O 11. Na4 Bd4 12. Be3 Bxe3 13. Rxe3 d5 14. exd5 cxd5 15. Rxe5 Ng4 16. Rh5 g6 17. Rh3 Nxf2 18. Kxf2 Bxh3 19. gxh3 dxc4 20. Bf1 Qc7 21. Kg1 Rad8 22. Qc2 {½-½ (22) Rambaldi,F (2558)-Milliet,S (2400) Brest 2019}) 11. Be3 Bxe3 {White is slightly better.} 12. Rxe3 Rb8 13. Qd2 O-O 14. Be2 Ne8 15. c5 Qe7 16. cxd6 Nxd6 17. Rd1 Nb7 $1 18. Na4 Nd8 19. Qc3 Qc7 20. Nc5 (20. Rd5 {looks sharper.} Re8 21. b3 Kh8 22. Ra5 f6 23. Nc5) 20... Ne6 21. Nxe6 Bxe6 22. b3 Rfd8 23. Rc1 h6 24. h3 Rbc8 25. Ba6 Rb8 26. Be2 Rbc8 27. Ba6 Rb8 28. Rd3 Rxd3 29. Bxd3 Qd6 30. Be2 Rb4 31. Bf3 a5 {The position is equal.} 32. Rd1 Qc7 33. Qc5 Rb5 $1 {[%cal Rb5c5]} 34. Qd6 (34. Qc2 {feels hotter.} Rb4 35. Rc1 a4 36. bxa4 Rc4 37. Qd1) 34... Qxd6 $1 35. Rxd6 $11 {[%mdl 4096] Endgame KRB-KRB} Rc5 36. Rd8+ Kh7 37. Rd2 Kg6 38. Bg4 Kf6 39. Kf1 a4 (39... Bxg4 {is more complex.} 40. hxg4 Rc1+ 41. Ke2 Kg5 42. Rd7 Rc2+) 40. Bxe6 {[#] Bc4 is the strong threat.} Kxe6 {KR-KR} 41. Ke2 axb3 42. axb3 Rb5 43. Rd3 Rb4 44. f3 g6 45. Kd2 c5 46. Kc3 Rd4 47. Rd2 f5 48. exf5+ gxf5 49. Ra2 e4 50. fxe4 fxe4 51. Ra6+ Kd5 52. Rxh6 Rd3+ 53. Kc2 Rg3 54. h4 Rxg2+ 55. Kc3 Rg3+ 56. Kc2 Kd4 57. Rd6+ Ke5 58. Rc6 Kd5 59. Rc8 Rh3 60. Rd8+ Ke5 61. Rc8 Kd4 62. Rd8+ Ke3 63. Rd5 Kf2 64. Rxc5 e3 {Threatens to win with ...e2.} 65. Re5 Ke1 66. b4 e2 67. b5 Rxh4 68. Kd3 Rh3+ 69. Kc4 Kd2 {[#]} 70. Rxe2+ $1 {[%mdl 512]} Kxe2 71. b6 Rh8 72. Kd5 Kd3 73. b7 Rb8 74. Kc6 Rxb7 75. Kxb7 {Accuracy: White = 90%, Black = 91%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.15"]
[Round "4.3"]
[White "Esipenko, Andrey"]
[Black "Van Foreest, Jorden"]
[Result "1/2-1/2"]
[ECO "D26"]
[WhiteElo "2654"]
[BlackElo "2667"]
[Annotator "TA"]
[PlyCount "60"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,60,20,16,19,27,8,9,0,8,13,55,11,14,7,12,7,6,7,6,11,11,9,9,13,8,7,0,0,11,14,13,13,28,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. d4 d5 2. c4 dxc4 3. e3 Nf6 4. Bxc4 e6 5. Nf3 c5 6. O-O Nc6 7. Nc3 {D26: Queen's Gambit Accepted: 4 e3 e6 5 Bxc5 c5 sidelines.} a6 8. d5 Na5 9. b3 b5 $1 {[%cal Rb5c4]} 10. Bd3 $1 {[#]} b4 $146 ({Predecessor:} 10... Nxd5 11. Nxd5 exd5 12. Bb2 Nc6 13. a4 b4 14. Qc2 Bg4 15. Rad1 Bxf3 16. gxf3 Bd6 {1-0 (44) Sarana,A (2664)-Xu,X (2583) Moscow 2019}) 11. Ne4 {next dxe6 is good for White.} exd5 12. Nxf6+ Qxf6 13. Rb1 Nc6 14. e4 Bg4 $1 15. exd5 Bxf3 $1 16. Re1+ Be7 17. Qxf3 Qxf3 18. gxf3 Nd4 19. Kg2 {[#] Strongly threatening d6.} Kd7 20. Be3 g6 21. Rbc1 Rhc8 22. Bxd4 (22. h4 $5) 22... cxd4 {The position is equal.} 23. Rc6 Rxc6 24. dxc6+ $11 {[%mdl 4096] Endgame KRB-KRB} Kd6 25. Re4 Bf6 26. Rf4 Ke5 27. Re4+ Kd6 28. Rf4 Ke5 29. Re4+ Kd6 30. Rf4 Ke5 {Accuracy: White = 89%, Black = 95%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.15"]
[Round "4.4"]
[White "Krejci, Jan"]
[Black "Bartel, Mateusz"]
[Result "0-1"]
[ECO "D37"]
[WhiteElo "2559"]
[BlackElo "2639"]
[Annotator "TA"]
[PlyCount "80"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,86,28,18,58,45,47,33,34,41,54,26,27,26,-8,9,30,-56,-12,-11,-12,-40,-21,-55,0,0,0,0,47,35,36,0,21,30,37,0,6,-100,-78,-75,-77,-66,-17,0,0,-75,0,0,0,0,0,-14,-14,-14,0,-329,-330,-435,-290,-297,-301,-411,-406,-393,-390,-383,-375,-381,-381,-381,-373,-341,-266,-422,-418,-502,-499]} 1. Nf3 d5 2. d4 Nf6 3. c4 e6 4. Nc3 Nbd7 5. Bg5 h6 6. Bh4 c6 7. e3 g5 $1 {[%mdl 4] is recently more successful than 7...Be7. D51: Queen's Gambit Declined: 4 Bg5 Nbd7 sidelines.} 8. Bg3 Nh5 9. Be5 Nxe5 {White is slightly better.} 10. Nxe5 Nf6 11. Bd3 (11. Be2 {seems wilder.} Bg7 12. O-O Nd7 13. f4 O-O 14. Qd3) 11... Nd7 {[#]} 12. O-O $146 (12. Nf3 {is interesting.} dxc4 13. Bxc4 Bg7 14. O-O O-O 15. h3) ({Predecessor:} 12. Nxd7 Bxd7 13. Qh5 Bg7 14. h4 c5 15. cxd5 cxd4 16. Ne4 Qa5+ 17. Ke2 Qxd5 18. hxg5 {½-½ (35) Postny,E (2616)-Artemiev,V (2658) Novi Sad 2016}) 12... Nxe5 13. dxe5 Bd7 14. Qh5 ({White should try} 14. Rc1 $11) 14... Qc7 15. f4 Bc5 16. Rae1 O-O-O {Black wants to play ...gxf4.} 17. Kh1 (17. Qxf7 $2 Rhf8 $17) 17... Kb8 (17... Bxe3 $15 18. cxd5 (18. Rxe3 d4 $11) 18... gxf4) 18. Qxf7 $11 h5 19. cxd5 cxd5 20. Bb5 Rhf8 21. Qg6 Rg8 22. Qd3 Bc8 23. Rc1 {Strongly threatening Na4.} (23. Na4 $5 {[%cal Re1c1]} gxf4 24. Nxc5 $14 (24. exf4 Bf8 $14)) 23... Qg7 {...gxf4 is the strong threat.} 24. Rc2 {[#]} (24. Qe2 $1 $11 {was the only way to keep the balance.}) 24... a6 $1 $17 {[%mdl 1024] Hoping for ...gxf4. Black has strong compensation.} 25. Ba4 Bb6 26. Bb3 Bd7 27. Ba4 $1 Bc8 (27... h4 $11) 28. Bb3 $1 gxf4 ({Black should play} 28... h4 $17) 29. exf4 $11 Bd7 30. Ba4 $1 d4 31. Bxd7 {And now Na4 would win.} dxc3 32. Rd1 Qg4 {Threatens to win with ...Rg7.} 33. h3 $2 {[%mdl 8192]} ({Not} 33. bxc3 $2 Rg7 $19) (33. f5 $1 $11 Rgf8 34. fxe6 Qxe6 35. Bxe6 Rxd3 36. Rb1) 33... Qxf4 $19 34. Rxc3 Rg7 35. Qd6+ Ka7 {( -> ...Rxg2!)} 36. Rc8 Rxc8 37. Bxc8 Qg3 {[%csl Gg7][%cal Rg3g2]} ({Less strong is} 37... Qf2 38. Qd2 $15) 38. Qd2 Bf2 {[%csl Gg7][%cal Rg3g2]} 39. Bxb7 Kxb7 {[%csl Gg7][%cal Rg3g2]} 40. Qb4+ {[#]} Bb6 {Played: Kb7-a7} 0-1

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.15"]
[Round "4.5"]
[White "Abasov, Nijat"]
[Black "Kriebel, Tadeas"]
[Result "1-0"]
[ECO "A18"]
[WhiteElo "2670"]
[BlackElo "2524"]
[Annotator "TA"]
[PlyCount "73"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,73,23,33,11,7,9,19,15,11,13,10,10,0,21,17,16,25,13,10,18,20,4,101,79,120,31,60,31,29,39,29,29,134,119,128,130,131,125,162,162,158,155,145,135,181,158,187,174,317,315,332,320,436,428,725,679,727,726,692,671,652,631]} 1. c4 e6 2. Nc3 Nf6 3. e4 d5 4. e5 d4 5. exf6 dxc3 6. bxc3 Qxf6 7. d4 b6 8. Be2 $1 {[%mdl 4] is recently more successful than 8.Nf3. A18: English Opening: Flohr-Mikenas System (1 c4 Nf6 2 Nc3 e6 3 e4).} Bb7 9. Bf3 Bxf3 10. Nxf3 {The position is equal.} Bd6 11. Qa4+ c6 12. O-O O-O 13. Rb1 $36 {[%mdl 2048] White has some pressure.} Qf5 14. Rxb6 axb6 15. Qxa8 Qd3 16. Qa4 Qxc3 17. Be3 {[#]} Rd8 $146 (17... Qb4 $11 18. Qxb4 Bxb4) ({Predecessor:} 17... Qa3 18. Qxa3 Bxa3 19. Rb1 b5 20. cxb5 cxb5 21. Rxb5 Rd8 22. Kf1 Nc6 23. Ke2 Ra8 {1-0 (39) Pantzar,M (2326)-Tifferet,S (2254) Porto Carras 2018}) 18. Rb1 $1 $16 Bc7 19. h3 (19. Bd2 $16 Qd3 20. Rb3) 19... f6 20. Re1 Qd3 21. Rd1 Qf5 22. Qb3 Kh8 (22... Nd7 $11 {keeps the balance.}) 23. d5 $1 {[%cal Rd5d6]} exd5 24. Bxb6 Bxb6 25. Qxb6 {[%cal Rb6d8]} Qc8 26. cxd5 cxd5 27. a4 {[%cal Ba2a4,Ba4a5,Ba5a6,Ba6a7][%mdl 32]} Nd7 28. Qd4 Nf8 {[#]} 29. a5 $1 Qc6 30. Qb4 Ne6 (30... Qd6 $142 31. Qxd6 Rxd6) 31. Re1 $18 {Black must now prevent Qe7.} Kg8 {[#]} 32. a6 $1 {[%mdl 512]} Ra8 {[#]} (32... Qxa6 33. Qe7) 33. a7 $1 {[%mdl 512] White is clearly winning.} Nf8 (33... Qc8 $142 34. Qb6 h6 35. Rxe6 Rxa7) (33... Rxa7 34. Qb8+) 34. Re7 Qa6 {[#]} 35. Qb8 $1 {[%mdl 512]} Qc8 36. Qxc8 Rxc8 37. Rb7 {Accuracy: White = 90%, Black = 43%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.16"]
[Round "5.1"]
[White "Stefansson, Hannes"]
[Black "Krejci, Jan"]
[Result "1-0"]
[ECO "C92"]
[WhiteElo "2529"]
[BlackElo "2559"]
[Annotator "TA"]
[PlyCount "65"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,65,37,21,23,38,36,0,18,1,0,-20,8,7,8,9,25,22,23,33,74,70,72,77,69,69,79,79,77,77,84,81,86,89,148,120,138,137,129,131,172,173,29986,29987,29984,733,29995,29996]} 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 Bb7 10. d4 Re8 11. Nbd2 exd4 {C92: Closed Ruy Lopez: 9...Be6, Karpov and Flohr-Zaitsev Variations.} 12. cxd4 Nd7 13. Bd5 Nb6 {The position is equal.} 14. Bxc6 Bxc6 15. d5 Bd7 16. Nd4 Bf6 17. N2f3 {[#]} Nc4 $146 ({Predecessor:} 17... Rc8 18. Bf4 c5 19. dxc6 Bxc6 20. Nxc6 Rxc6 21. Rc1 Rxc1 22. Qxc1 Na4 23. e5 dxe5 24. Bxe5 Bxe5 25. Rxe5 Rxe5 26. Nxe5 {½-½ (37) Gao,R (2552)-Zhou,W (2635) Xinghua 2016}) 18. b3 Ne5 19. Bb2 Qb8 20. Rc1 Qb6 21. Nxe5 Bxe5 22. Qd2 h6 23. Nc6 Bxb2 24. Qxb2 Bxc6 25. Rxc6 Qa7 26. Re3 Re7 (26... Rad8 $142) 27. Rg3 $16 {[%csl Gg3][%cal Rb2g7]} g6 28. Qf6 Rae8 29. Rcc3 {Strongly threatening h4.} Qb8 ({And not} 29... Rxe4 30. Rxg6+ $1 {[%mdl 512]} Kf8 31. Rxh6 Qxf2+ 32. Kxf2 Rf4+ 33. Qxf4 Re2+ 34. Kxe2 f6 35. Rh8+ Kg7 36. Qh6+ Kf7 37. Rxc7#) 30. Rg4 {White wants to mate with Rcg3.} Qd8 $2 {[#]} (30... h5 $18 31. Rg5 h4) 31. Rcg3 $1 Qd7 32. Rh4 (32. f4 $142 b4 33. Rh4 Re6 34. dxe6 Qxe6 35. Qxe6 Rxe6 36. f5 Rf6 37. Rxh6) 32... Kh7 33. Qg5 {Accuracy: White = 91%, Black = 52%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.16"]
[Round "5.2"]
[White "Piorun, Kacper"]
[Black "Nguyen, Thai Dai Van"]
[Result "1/2-1/2"]
[ECO "C67"]
[WhiteElo "2611"]
[BlackElo "2560"]
[Annotator "TA"]
[PlyCount "43"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 16,43,12,18,18,17,8,14,12,10,19,17,27,0,0,1,9,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. e4 e5 2. Nf3 Nc6 3. Bb5 Nf6 4. O-O Nxe4 5. Re1 Nd6 6. Nxe5 Be7 7. Bf1 Nxe5 8. Rxe5 O-O 9. d4 Bf6 {C67: Ruy Lopez: Berlin Defence: 4 0-0 Nxe4.} 10. Re2 b6 11. Re1 Bb7 12. Bf4 Ne4 13. Nd2 Re8 {[#]} 14. Nf3 $146 ({Predecessor:} 14. c3 Bg5 15. Qg4 Bxf4 16. Qxf4 Qf6 17. Qxf6 Nxf6 18. Rxe8+ Rxe8 19. a4 a5 20. Bb5 {½-½ (52) Saric,I (2667)-Bok,B (2640) Khanty-Mansiysk 2019}) 14... d6 {The position is equal.} 15. a4 a6 16. Ra3 Qd7 17. Rae3 Qf5 18. Bg3 $1 Qd7 19. Bf4 Qf5 20. Bg3 $1 Qd7 21. Bf4 Qf5 22. Bg3 $1 {Accuracy: White = 93%, Black = 100%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.16"]
[Round "5.3"]
[White "Bartel, Mateusz"]
[Black "Abasov, Nijat"]
[Result "1-0"]
[ECO "E01"]
[WhiteElo "2639"]
[BlackElo "2670"]
[Annotator "TA"]
[PlyCount "71"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,71,0,0,0,0,0,0,0,0,39,24,28,0,0,8,30,36,73,82,72,48,34,37,75,0,0,0,44,42,70,72,67,62,91,77,135,135,183,172,185,186,176,154,237,222,235,221,235,257,343,344,29988,29989,29989,29990,29991,29992,29992,29978,29970,12086]} 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 Be7 5. Nc3 O-O 6. Nf3 dxc4 7. Ne5 Qd6 {E06: Closed Catalan: Early deviations.} 8. Nxc4 {8.0-0 is the hot move.} Qa6 $1 {[%cal Ra6c4]} 9. b3 Rd8 {The position is equal.} 10. a4 Bb4 {[#]} 11. Bd2 $146 ({Predecessor:} 11. Bb2 c5 12. O-O Bxc3 13. Bxc3 Nc6 14. e3 cxd4 15. exd4 Nd5 16. Bb2 Bd7 17. Re1 {½-½ (27) Vrolijk,L (2467)-Davtyan,A (2437) Groningen 2019}) 11... Rxd4 12. Qc1 Bd7 13. Be3 Nc6 (13... Rxc4 $5 14. bxc4 Qxc4 $11) 14. O-O Bxc3 15. Qxc3 Nd5 16. Qb2 Nxe3 17. fxe3 Rg4 18. Rad1 (18. Qc3 $16) 18... Be8 $1 $11 19. Bxc6 bxc6 20. Qa3 {Threatens to win with Qe7.} Qb7 21. Rd3 $1 {[%mdl 1024] White has compensation.} Rg5 22. Qe7 $36 {[%mdl 2048] White is pushing.} h6 23. e4 {And now h4 would win.} Kh7 (23... c5 $142) 24. Rf4 $1 $16 {Hoping for h4.} Rg6 {[#]} 25. Ne5 $1 {[%cal Re5g6]} Rg5 26. Nf3 ({Resist} 26. Nxf7 Bxf7 27. Rxf7 Rg6 $16) 26... Rg6 27. e5 {aiming for Rfd4.} Qb6+ (27... c5 $16 28. Qxc5 Qb6) 28. Kg2 $18 c5 {[#]} 29. h4 $1 {[%cal Rh4h5] Strongly threatening h5.} Bc6 30. Qxf7 Bxf3+ 31. exf3 {Rf6 is the strong threat.} ({Weaker is} 31. Rfxf3 c4 $16) 31... Qa5 $2 {[#]} (31... Qa6 $18 32. Rc4 Rb8) 32. Rf6 $1 {[%mdl 512] White mates.} Rxg3+ 33. Kxg3 Qe1+ {[#]} 34. Kg4 $1 Qxe5 35. Qg6+ Kg8 36. Rxe6 {Accuracy: White = 96%, Black = 57%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.16"]
[Round "5.4"]
[White "Van Foreest, Jorden"]
[Black "Cernousek, Lukas"]
[Result "1/2-1/2"]
[ECO "C11"]
[WhiteElo "2667"]
[BlackElo "2442"]
[Annotator "TA"]
[PlyCount "77"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,77,8,8,9,22,12,24,19,26,0,0,0,23,10,1,0,20,11,31,22,42,43,41,43,30,14,15,15,20,23,18,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,-121,-125,-158,0,0,0,0,0,0,0,0,0,0]} 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Nbd7 6. Nf3 Be7 7. Nxf6+ Bxf6 8. Qd2 Bxg5 9. Nxg5 {C13: French: Classical System: 4 Bg5 Be7, Alekhine-Chatard Attack.} h6 10. Nf3 O-O 11. O-O-O {White has an edge.} b6 12. Bd3 Bb7 13. Qe3 {[#]} Qf6 $146 ({Predecessor:} 13... Nf6 14. Ne5 Nd5 15. Qe4 Qg5+ 16. Rd2 f5 17. Qf3 Rab8 18. h4 Qd8 {½-½ (39) Kaniansky,M (2126)-Podoba,M (2062) Slovakia 2019}) 14. Ne5 Rad8 15. f4 Nxe5 16. dxe5 Qh4 17. Rd2 Kh8 18. Rhd1 Rd7 ({Wrong is} 18... Qxh2 $2 19. g3 $18) 19. g3 Qe7 20. Be2 Rfd8 21. Rxd7 Rxd7 22. Rxd7 Qxd7 23. Qa3 Qd4 24. Qxa7 Qe3+ 25. Kd1 Bf3 26. Bxf3 Qxf3+ $11 {[%mdl 4096] Endgame KQ-KQ} 27. Kd2 Qf2+ 28. Kd3 Qf3+ 29. Kc4 Qd5+ 30. Kc3 Qc5+ 31. Kb3 Qb5+ 32. Ka3 Qc5+ 33. b4 (33. Kb3 $11 {was the only way to keep the balance.}) 33... Qxc2 $17 34. Qb7 c6 $2 (34... Qxh2 $17 35. Qa8+ Kh7 36. Qe4+ g6) 35. Qxb6 {The position is equal.} Qc3+ 36. Ka4 {Qc5 is the strong threat.} Qc2+ {[%mdl 64] [#] Double Attack} 37. Ka3 Qc3+ 38. Ka4 {Threatens to win with Qc5.} Qc2+ {[%mdl 64] Double Attack} 39. Ka3 {Accuracy: White = 87%, Black = 96%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.16"]
[Round "5.5"]
[White "Kriebel, Tadeas"]
[Black "Esipenko, Andrey"]
[Result "0-1"]
[ECO "E04"]
[WhiteElo "2524"]
[BlackElo "2654"]
[Annotator "TA"]
[PlyCount "70"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,70,24,16,14,16,13,0,20,13,10,10,22,14,14,7,9,12,55,0,0,-6,0,0,0,0,0,-52,-41,-43,-28,-42,-34,-63,-32,-29,0,0,0,0,0,-54,-48,-51,-56,-52,-46,-65,-74,-121,-116,-160,-168,-330,-357,-377,-368,-368,-368,-518,-513,-554,-533]} 1. d4 Nf6 2. c4 e6 3. g3 d5 4. Bg2 dxc4 5. Nf3 a6 6. Ne5 Bb4+ {E04: Open Catalan: 5 Nf3.} 7. Nc3 {[#] Threatens to win with Qa4+.} Nd5 8. O-O {Hoping for Nxd5.} O-O {The position is equal.} 9. Ne4 b5 10. b3 cxb3 11. axb3 Bb7 12. Nd3 {[#]} Bc3 $146 {[%mdl 2048] Black has the initiative.} ({Predecessor:} 12... Be7 13. Nec5 Bc6 14. Bb2 Nf6 15. e4 Bxc5 16. Nxc5 Nbd7 17. Nxd7 Nxd7 18. Bc3 Bb7 {0-1 (38) Harikrishna,P (2731)-Nakamura,H (2741) Kolkata 2019}) 13. Bg5 Qe8 14. Rc1 (14. Nxc3 $14 Nxc3 15. Qc2 Bxg2 16. Kxg2) 14... Bxd4 $11 15. Ndc5 Bxc5 $1 16. Nxc5 Bc6 17. e4 Nb6 18. Qc2 ({White should try} 18. Qg4 $11 f5 19. Qh4) 18... h6 $15 19. Be3 a5 20. Nd3 N6d7 21. Qb2 b4 22. Rfd1 e5 23. Nc5 Nf6 24. f3 Bb5 25. Nb7 (25. Bh3 $11) 25... Nbd7 $1 26. Ra1 Qe6 27. Nxa5 Rfb8 28. Qf2 Ne8 29. Rdc1 Ra6 {...Rba8 is the strong threat.} 30. Bf1 {[#]} Nd6 $1 {White must now prevent ...Rba8.} 31. Bxb5 $2 (31. Qd2 {was the only defense.}) 31... Rxb5 $19 ({Less strong is} 31... Nxb5 32. Nc4 $17) 32. Nc6 Rxa1 33. Rxa1 Qxb3 34. Qe2 (34. Bd2 $142) 34... Qc4 35. Ne7+ Kf8 {Accuracy: White = 61%, Black = 90%.} 0-1

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.18"]
[Round "6.1"]
[White "Bartel, Mateusz"]
[Black "Stefansson, Hannes"]
[Result "1/2-1/2"]
[ECO "A13"]
[WhiteElo "2639"]
[BlackElo "2529"]
[Annotator "TA"]
[PlyCount "67"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,67,3,9,0,0,2,18,18,20,3,1,-19,0,-4,-5,-8,7,0,0,0,9,7,16,12,19,7,22,11,51,0,0,0,16,4,5,8,22,22,15,17,16,20,16,0,0,0,23,0,1,0,0,0,15,8]} 1. c4 e6 2. g3 Nf6 3. Bg2 d5 4. d4 Be7 5. Nc3 O-O 6. Nf3 dxc4 7. Ne5 c5 8. dxc5 Qxd1+ 9. Nxd1 {E06: Closed Catalan: Early deviations.} Bxc5 10. Nc3 Nc6 11. Nxc4 Nd5 12. Bd2 Rd8 13. Ne4 Be7 14. Rc1 b6 15. Nc3 Bc5 {[#]} 16. Ne3 $146 {[%cal Re3d5]} ({Predecessor:} 16. Nxd5 exd5 17. Na5 Nxa5 18. Bxa5 Rd7 19. O-O Ba6 20. Rfe1 g6 21. e3 Bxe3 22. fxe3 bxa5 23. Rc5 Bb7 24. Rxa5 {½-½ (33) Sarana,A (2618)-Leko,P (2669) Moscow 2018}) 16... Nde7 17. Na4 Bxe3 18. Bxe3 Ba6 19. f4 Rac8 20. Kf2 Nb4 21. a3 Nc2 {next ...Nf5 is good for Black.} 22. Be4 (22. Bc5 $14 bxc5 23. Rxc2) 22... Nxe3 $11 23. Kxe3 Bc4 (23... Nf5+ {is interesting.} 24. Bxf5 exf5 25. Rxc8 Rxc8 26. Nc3 Kf8) 24. Rhd1 Rxd1 25. Rxd1 Nd5+ 26. Bxd5 Bxd5 {[%mdl 4096] Endgame KRB-KRN} 27. Nc3 Bc6 28. Rd4 b5 29. Kd2 Kf8 30. e4 Ke7 31. e5 a5 {The position is equal.} 32. Rd6 f6 33. Ne2 Bd7 34. Ra6 {Accuracy: White = 95%, Black = 95%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.18"]
[Round "6.2"]
[White "Nguyen, Thai Dai Van"]
[Black "Van Foreest, Jorden"]
[Result "0-1"]
[ECO "A26"]
[WhiteElo "2560"]
[BlackElo "2667"]
[Annotator "TA"]
[PlyCount "106"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 14,106,12,12,61,73,61,40,33,7,6,0,0,0,0,0,0,0,0,0,0,-10,0,0,0,0,0,-47,-28,-50,-41,-39,-39,-50,-50,-50,-50,-50,-50,-50,-28,-50,-8,-8,-8,-8,-8,-8,-8,-8,0,-18,-18,-18,-18,-48,-35,-16,-27,-29,-31,-90,-90,-90,-90,-222,-227,-249,-130,-304,-276,-361,-361,-400,-400,-345,-345,-596,-596,-5106,-5106,-5106,-5106,-5106,-5106,-5106,-5106,-5104,-5089,-5085,-868,-29983,-29985,-29988,-29989]} 1. c4 e5 2. g3 Nc6 3. Bg2 g6 4. Nc3 Bg7 5. d3 d6 6. e4 f5 7. Nge2 Nf6 8. Nd5 f4 $5 {[%mdl 4] Exploring less charted territory. A26: English Opening vs King's Indian with ...Nc6 and d3.} 9. gxf4 O-O 10. O-O Nh5 {White is slightly better.} 11. fxe5 dxe5 {[#]} 12. b4 $146 ({Predecessor:} 12. f4 Bg4 13. Qe1 Qd7 14. f5 gxf5 15. exf5 Bxf5 16. Qh4 Bg6 17. Be3 Rae8 18. Rxf8+ Rxf8 {1-0 (45) Bachmann,A (2629)-Christiansen,J (2558) chess24.com INT 2019}) 12... Nd4 13. Nxd4 exd4 14. b5 c6 15. bxc6 bxc6 16. Nb4 Qh4 {Hoping for ...Be5.} 17. f4 Bd7 {[%cal Rh5f4]} 18. e5 Nxf4 19. Bxf4 Rxf4 20. Rxf4 (20. Qe2 {is interesting.} Re8 21. Nxc6 Bxc6 22. Rxf4 Qxf4 23. Bxc6 Rxe5 24. Qf2) 20... Qxf4 21. Qf3 Qxe5 {And now ...Qe3+ would win.} 22. Nxc6 Qe3+ 23. Qxe3 dxe3 24. Ne7+ Kh8 25. Bxa8 Bxa1 $15 {[%mdl 4096] Endgame KBB-KBN} 26. Bf3 $1 Kg7 27. Nd5 Bf5 28. Be2 g5 29. Kg2 Bd4 30. Kf3 h5 31. Nxe3 Bg6 32. h3 Kf6 33. Nd5+ Ke5 34. Ne7 Be8 {[%mdl 1024] Black has compensation.} 35. Nd5 a5 36. Bd1 Bc5 37. Kg2 (37. Nc7 $15 Bc6+ 38. Kg3) 37... Bg6 $1 $17 38. Be2 Kd4 $1 39. Nc7 (39. Nf6 $17) 39... Ke3 $19 ({Not} 39... Bxd3 40. Ne6+ Ke5 41. Bxd3 $11) 40. Ne6 Be7 ({Weaker is} 40... Kxe2 41. Nxc5 Bf5 42. Nb7 $11) 41. Bf3 $2 (41. Bf1 $17) 41... Bxd3 42. Bd5 {[#]} Be4+ $1 43. Bxe4 Kxe4 {KB-KN} 44. Kg3 {[#]} a4 $1 {[%cal Ba5a4,Ba4a3,Ba3a2][%mdl 32]} 45. Ng7 $2 (45. Kf2 {was the only chance.} h4 46. Ke2) 45... Kd3 46. Nxh5 Kc3 47. Ng7 Kb2 48. Ne6 Kxa2 49. c5 a3 50. c6 Bd6+ 51. Kf3 Kb2 52. Nc5 a2 53. Na4+ Kc2 {Accuracy: White = 57%, Black = 95%.} 0-1

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.18"]
[Round "6.3"]
[White "Abasov, Nijat"]
[Black "Esipenko, Andrey"]
[Result "1-0"]
[ECO "C44"]
[WhiteElo "2670"]
[BlackElo "2654"]
[Annotator "TA"]
[PlyCount "77"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 10,77,3,-4,-4,-10,0,-4,0,0,0,0,0,0,13,9,12,12,13,6,11,0,0,0,11,16,14,14,20,18,16,19,12,7,6,10,38,43,37,39,39,39,39,48,33,38,38,29,73,75,104,103,185,141,142,120,164,168,170,170,171,178,186,186,761,740,5397,5181,29974,29974]} 1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d4 exd4 5. e5 Nd5 6. Bc4 Nb6 {C44: Ponziani Opening and Scotch Gambit.} 7. Bb3 Be7 8. O-O d6 {The position is equal.} 9. exd6 Qxd6 10. Nxd4 Nxd4 11. cxd4 {[#]} c6 $146 ({Predecessor:} 11... Be6 12. Bxe6 Qxe6 13. Re1 Qd7 14. Qe2 Nd5 15. Nc3 Nxc3 16. bxc3 O-O 17. Rb1 b6 18. Bf4 Bd6 {½-½ (18) Sermek,D (2495)-Mikhalchishin,A (2520) Portoroz 1993}) 12. Nc3 O-O 13. Re1 Bf6 14. Be3 Bf5 15. Qf3 Qd7 16. h3 Rad8 17. Rad1 Nd5 18. Bxd5 cxd5 19. Bf4 Bc2 20. Rd2 Bg6 21. Be5 Bg5 22. Rde2 Qf5 {[#] Strongly threatening ...Qxf3.} 23. Qg3 f6 24. Bd6 Rfe8 25. Rxe8+ Rxe8 26. Rxe8+ Bxe8 27. f4 Bh6 28. Qe3 {[%cal Re3e8]} Bc6 29. Qe7 {[%csl Gd6][%cal Re7f8]} Qc8 30. Kh2 b5 (30... g6 $16) 31. b4 a6 32. a3 g6 33. Qxf6 {And now Be5 would win.} Bg7 {[#]} 34. Qg5 $1 Bxd4 35. Nxd5 {Threatens to win with Ne7+.} Qd7 36. Qe7 $40 {[%csl Gd6][%cal Re7f8][%mdl 128] White wants a kill.} Qe8 $2 (36... h5 37. Nf6+ Bxf6 38. Qf8+ (38. Qxf6 Qf7 $16) 38... Kh7 39. Qxf6 Qg7) 37. Be5 $18 Bxe5 38. fxe5 {White wants to mate with Nf6+!} Qf7 39. e6 {Accuracy: White = 96%, Black = 58%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.18"]
[Round "6.4"]
[White "Krejci, Jan"]
[Black "Piorun, Kacper"]
[Result "1/2-1/2"]
[ECO "D71"]
[WhiteElo "2559"]
[BlackElo "2611"]
[Annotator "TA"]
[PlyCount "49"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,49,27,21,37,0,4,0,19,8,8,5,6,0,0,0,18,0,0,0,0,-25,-30,-37,-29,-38,-21,-37,-12,-57,0,0,0,0,0,0,0,0,0,0]} 1. d4 Nf6 2. c4 g6 3. g3 Bg7 4. Bg2 c5 5. Nf3 O-O 6. Nc3 cxd4 7. Nxd4 Qc7 {E60: King's Indian: Unusual lines and Fianchetto Variation without Nc3.} 8. Nd5 Nxd5 9. cxd5 Qb6 10. Nb3 d6 11. O-O Qa6 12. Nd4 Qb6 13. Nb3 Qa6 14. Nd4 Qb6 $36 {[%mdl 2048] White is under pressure.} 15. Nc2 Na6 16. a4 Bd7 17. a5 Qb5 18. Nd4 Qc4 19. Be3 Rfc8 20. Ra3 Nb4 (20... Rc7 $15) 21. Rc3 $11 {The position is equal.} Qa2 22. Ra3 Qc4 23. Rc3 Qa2 24. Ra3 Qc4 25. Rc3 {Accuracy: White = 79%, Black = 87%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.18"]
[Round "6.5"]
[White "Cernousek, Lukas"]
[Black "Kriebel, Tadeas"]
[Result "1-0"]
[ECO "C47"]
[WhiteElo "2442"]
[BlackElo "2524"]
[Annotator "TA"]
[PlyCount "93"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 15,93,37,37,37,37,37,49,37,37,41,45,44,47,21,84,-12,0,-7,33,81,101,110,102,110,84,84,98,93,101,100,80,61,91,72,76,84,93,63,66,74,74,74,74,74,74,74,108,109,131,124,2114,2095,2057,1417,6249,6270,6503,5481,29977,1028,821,0,29977,29978,29977,29978,29968,29969,29988,6270,29994,29985,29985,29985,29985,6470,29997,29998,29998,29999]} 1. e4 e5 2. Nf3 Nc6 3. Nc3 Nf6 4. d4 exd4 5. Nxd4 Nxe4 6. Nxe4 Qe7 7. f3 d5 8. Bb5 {8.Bb5 is better than 8.Nxc6.} Bd7 9. O-O {Strongly threatening Re1. has lost popularity (9.Bxc6). C47: Scotch Four Knights and Four Knights with 4 g3.} dxe4 10. Bxc6 $1 bxc6 11. Re1 {White is slightly better.} O-O-O {Threatens to win with ...c5.} 12. Rxe4 Qb4 13. Nb3 Qb7 {[#]} 14. Qe2 $146 ({Predecessor:} 14. Be3 Bf5 15. Rd4 Bd6 16. Qf1 Be5 17. Ra4 Qb5 18. Rxa7 Qxf1+ 19. Rxf1 Kb8 20. Na5 {0-1 (35) Belenkaya,D (2323)-Eugene,F (2193) Avoine 2017}) 14... f5 (14... Bd6 $11) 15. Ra4 (15. Re5 $16) 15... c5 $11 16. Ra5 $36 {[%mdl 2048] White has some pressure.} Re8 (16... c4 $5 17. Qxc4 Qb6+ 18. Qd4 Be6 19. Qxb6 Rd1+ 20. Kf2 axb6 $11) 17. Qf2 c4 18. Rxa7 Re1+ 19. Qxe1 Qxa7+ 20. Be3 Qa4 21. Nd4 Bd6 22. Qd2 Re8 23. a3 Be5 24. Bf4 Bf6 25. c3 h6 26. Re1 Rxe1+ 27. Qxe1 Bxd4+ 28. cxd4 g5 29. Be5 Qc2 30. Qc3 Qd1+ 31. Kf2 Be6 32. h3 {aiming for Qa5.} Qb1 $2 {[%mdl 8192] [#]} (32... Qa4 $16 33. Qd2 Qb3) 33. d5 $1 $18 {[%mdl 512]} Bxd5 {[#]} 34. Qa5 $1 {[%csl Ge5][%cal Ra5c7][%mdl 576] Double Attack} Qc2+ {[#]} 35. Kg1 $1 {[%csl Ge5][%cal Ra5c7][%mdl 512]} Qd1+ 36. Kh2 {[%csl Ge5][%cal Ra5c7]} Kb7 37. Qb5+ (37. Qxc7+ $142 Ka6 38. Qd6+ Kb7 39. Qd7+ Ka6 40. a4 Qb3 41. Qxd5 h5 42. Qa8+ Kb6 43. a5+ Kc5 44. a6) 37... Kc8 {[#]} 38. Qa5 (38. Qc5 $1 $18 {[%mdl 512]} Bc6 39. Qxc6 {[%mdl 64] Double Attack}) 38... Kb7 $1 39. Qxc7+ Ka6 40. Qd6+ Kb5 41. Qd7+ Kb6 42. Bc7+ (42. a4 $142 Qxa4 43. Qxa4 Bg8 44. Qd7 g4 45. Bd4+ Ka5 46. Qb7 g3+ 47. Kh1 h5 48. Bc3+ Ka4 49. Qb4#) 42... Ka6 43. a4 Qd4 44. Qb5+ Ka7 45. Bd6 (45. Bb8+ $142 Ka8 46. Bd6 Ka7 47. Bc5+ Qxc5 48. Qxc5+ Kb8 49. Qxd5 Kc7 50. a5) 45... Qd2 46. Bc5+ Ka8 47. Qa6+ {[%mdl 64] Double Attack. Accuracy: White = 81%, Black = 63%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.19"]
[Round "7.1"]
[White "Stefansson, Hannes"]
[Black "Abasov, Nijat"]
[Result "1/2-1/2"]
[ECO "E16"]
[WhiteElo "2529"]
[BlackElo "2670"]
[Annotator "TA"]
[PlyCount "62"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 19,62,33,23,16,15,11,12,12,18,12,19,23,22,6,14,10,7,11,4,5,16,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. d4 Nf6 2. c4 e6 3. Nf3 b6 4. g3 Bb7 5. Bg2 Bb4+ 6. Bd2 Bxd2+ 7. Qxd2 O-O 8. O-O d6 9. Nc3 Ne4 10. Nxe4 Bxe4 11. Qe3 {E16: Queen's Indian: 4 g3 Bb7 5 Bg2 Bb4+.} Bb7 12. Qd3 {Black must now prevent Ng5!} f5 13. Ne1 Bxg2 14. Nxg2 {[#]} e5 $146 ({Predecessor:} 14... Qf6 15. Qf3 c6 16. Rfd1 d5 17. Rac1 Nd7 18. Qa3 Rfc8 19. Nf4 g5 20. Nd3 Qxd4 21. cxd5 cxd5 {1-0 (39) Alekseev,E (2707)-Raznikov,D (2486) St Petersburg 2013}) 15. dxe5 dxe5 16. Qf3 {The position is equal.} e4 17. Qc3 Nc6 18. Rfd1 Qf6 19. Qxf6 Rxf6 20. Rd7 Rf7 21. Rad1 Ne5 22. Rxf7 Kxf7 $11 {[%mdl 4096] Endgame KRN-KRN} 23. Ne3 g6 24. Kg2 Re8 25. f4 exf3+ 26. exf3 Re7 27. Kf2 Rd7 28. Rxd7+ Nxd7 29. Ke2 Ke6 30. f4 Kd6 31. b4 a6 {Accuracy: White = 100%, Black = 100%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.19"]
[Round "7.2"]
[White "Piorun, Kacper"]
[Black "Bartel, Mateusz"]
[Result "1-0"]
[ECO "C00"]
[WhiteElo "2611"]
[BlackElo "2639"]
[Annotator "TA"]
[PlyCount "117"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 12,117,14,14,18,12,15,3,14,12,25,0,17,0,32,17,50,49,70,71,84,76,90,63,70,73,67,41,52,45,51,53,51,0,44,47,41,45,39,44,154,137,209,220,212,208,250,227,228,244,256,229,234,193,193,169,201,208,209,185,303,288,272,300,387,300,289,265,318,312,321,323,564,570,495,322,316,319,311,293,318,318,314,316,314,304,272,259,259,262,260,259,257,257,257,258,258,258,260,269,264,180,244,180,197,197,224,216]} 1. e4 e6 2. d4 d5 3. Nc3 Bb4 4. exd5 exd5 5. Bd3 Nc6 6. a3 Bxc3+ 7. bxc3 Be6 {C01: French: Exchange Variation.} 8. Qf3 {8.Ne2 gains popularity. has lost popularity (8.Rb1).} Qd7 9. Ne2 O-O-O {The position is equal.} 10. h3 Nge7 11. Ng3 g6 12. O-O h5 13. Re1 {[#]} h4 $146 ({Predecessor:} 13... Rde8 14. a4 Nf5 15. Nxf5 Bxf5 16. Bg5 Rhg8 17. Reb1 a6 18. Rb2 Bxd3 19. cxd3 Qf5 {½-½ (19) Kivijarvi,J (2195)-Lehtivaara,P (2303) Finland 2013}) 14. Nf1 Rh5 15. Nh2 Bf5 16. Ng4 {[#] Strongly threatening Nf6.} Ng8 17. Bf4 Bxd3 18. cxd3 f6 19. Re2 Rh7 20. Rae1 Qf5 21. Ne3 Qh5 22. Ng4 Qf5 $1 23. Re8 Re7 24. Rxd8+ Nxd8 25. Ne3 Qd7 ({Better is} 25... Qxd3 $14 26. Qg4+ (26. Qxd5 Qxc3 27. Rd1 Ne6 $14) 26... Re6) 26. Rb1 c6 {[#]} (26... g5 $16) 27. Bh2 $1 $18 {And now Qf4 would win.} Ne6 28. Qg4 {[%mdl 64] Double Attack} Qe8 29. Qxh4 b6 30. c4 $40 {[%mdl 128] White goes for the king.} Rd7 31. Re1 Kb7 32. Nc2 Qf7 33. Qg4 Nc7 34. c5 Nh6 35. Qf4 g5 (35... Nf5 $142 36. Qd2 Na6) 36. Qd2 Nf5 37. Rb1 Ne7 38. a4 Na6 39. Qc3 Nc8 40. Na1 Re7 41. Nb3 Re6 $2 (41... Qe8 42. cxb6 axb6 43. Na5+ Ka8 44. Nxc6 Re6) 42. cxb6 axb6 43. Na5+ Ka8 44. Nxc6 {Hoping for Nd8!} Qe8 45. Rc1 Kb7 {[%cal Re6c6]} 46. Nb4 Nxb4 47. Qxb4 Rc6 48. Re1 Re6 49. Rxe6 Qxe6 50. Bg3 Ne7 51. a5 Nf5 52. Kh2 Qc6 53. axb6 Qxb6 54. Qa4 {aiming for Qd7+.} Qc6 55. Qb3+ Kc8 56. Qb8+ Kd7 {White is clearly better.} 57. Qg8 Qe6 58. Qh7+ Ke8 59. h4 {Accuracy: White = 86%, Black = 67%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.19"]
[Round "7.3"]
[White "Van Foreest, Jorden"]
[Black "Krejci, Jan"]
[Result "1-0"]
[ECO "C92"]
[WhiteElo "2667"]
[BlackElo "2559"]
[Annotator "TA"]
[PlyCount "61"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 28,61,44,48,47,27,53,53,66,54,56,53,67,66,126,133,130,138,134,109,130,79,100,88,156,91,87,90,258,258,252,243,265,287,291,316]} 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 Re8 10. d4 h6 11. Nbd2 Bf8 12. Nf1 Bd7 13. Ng3 Na5 14. Bc2 c5 15. d5 Nc4 {C93: Closed Ruy Lopez: Smyslov Variation.} 16. Nh2 a5 17. a4 {[#]} b4 $146 {White is slightly better.} ({Predecessor:} 17... Nb6 18. axb5 Bxb5 19. Nf5 Kh7 20. Ne3 a4 21. Bd3 Bxd3 22. Qxd3 g6 23. Nf3 Qd7 {1-0 (84) Lukasova,A (2270)-Dziedzic,A (2176) ICCF email 2017}) 18. b3 Nb6 19. c4 Nc8 20. f4 Nh7 ({Black should play} 20... Ne7 $14) 21. Rf1 Be7 22. fxe5 dxe5 23. Be3 Ra6 24. Qh5 (24. Nf3 $142) 24... Rg6 $16 25. Nf5 ({Don't blunder} 25. Qxe5 $2 Bd6 $19) 25... Qb6 (25... Bxf5 $142 26. exf5 (26. Qxf5 Nd6 $14) 26... Rg3) 26. Nf3 ({White should try} 26. Nxe7+ Rxe7 27. Kh1) 26... Bd8 {Black wants to play ...Nf6.} 27. N3h4 $36 {[%mdl 2048] White has strong initiative.} Rf6 $2 (27... Bxf5 $16 28. Nxf5 (28. Qxf5 Nd6 $16) 28... Nd6) 28. Qg4 $18 {[%csl Gf5][%cal Rg4g7]} Bxf5 29. Nxf5 {[%csl Gf5][%cal Rg4g7]} ({Less strong is} 29. Rxf5 Nd6 $16) 29... Rg6 {[#]} 30. Nxh6+ $1 {[%mdl 576] Discovered Attack} gxh6 (30... Rxh6 31. Qxc8) 31. Qxc8 {Accuracy: White = 71%, Black = 60%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.19"]
[Round "7.4"]
[White "Esipenko, Andrey"]
[Black "Cernousek, Lukas"]
[Result "1-0"]
[ECO "D35"]
[WhiteElo "2654"]
[BlackElo "2442"]
[Annotator "TA"]
[PlyCount "93"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 26,93,9,0,2,0,0,0,0,0,32,21,22,19,13,26,40,45,51,44,38,14,46,32,64,77,62,46,45,39,42,27,27,27,28,20,88,87,165,165,214,227,416,256,279,277,271,262,272,261,232,245,268,263,260,248,529,514,414,235,289,276,438,426,535,509,806,771,640,587]} 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 Nd7 12. O-O b6 13. Rad1 Bb7 14. Rfe1 Rc8 {D41: Queen's Gambit Declined: Semi-Tarrasch with 5 cxd5.} 15. Bb3 Re8 16. h3 h6 {The position is equal.} 17. Re3 Qf6 18. Qe2 Qf4 19. e5 {[#]} Nf8 $146 ({Predecessor:} 19... Red8 20. g3 Qf5 21. g4 Qg6 22. Ne1 Qg5 23. Ng2 Bxg2 24. Kxg2 Nf8 25. Qf3 Ng6 26. Kf1 {½-½ (26) Sethuraman,S (2630)-Batchuluun,T (2535) Changsha 2019}) 20. Bc2 Rc7 21. g3 Bxf3 $1 22. Rxf3 Qg5 $1 ({Much weaker is} 22... Rxc2 23. Qd3 $16 (23. Rxf4 $2 {loses.} Rxe2 24. a3 Rd8 $19)) 23. Be4 Ng6 24. Re3 Rec8 25. h4 $36 {[%mdl 2048] White has strong initiative.} Qe7 26. d5 exd5 27. Bxd5 Nf8 $1 28. Bb3 Rc1 29. Red3 Rxd1+ 30. Rxd1 Rc5 (30... Rd8 $11 {keeps the balance.}) 31. f4 $1 $16 Rc3 (31... b5 $16 {is a better defense.}) 32. Kh2 $18 Qc5 33. Rd8 $1 {And now e6 would win.} Rc1 $2 (33... Qe3 34. Qxe3 Rxe3) 34. e6 {e7 would kill now.} Qg1+ 35. Kh3 Qh1+ {[#]} 36. Qh2 $1 {White wants to mate with e7.} Qe4 37. exf7+ Kh7 {[#]} 38. Bd1 $1 ({Inferior is} 38. Rxf8 Qf5+ 39. Kg2 Qe4+ 40. Kh3 Qf5+ 41. Kg2 Qe4+ 42. Kh3 $11) 38... Qf5+ 39. Bg4 Qxf7 {White must now prevent ...h5.} 40. Qd2 Rh1+ $2 (40... Rc6 41. Qd3+ Kh8) 41. Kg2 Ra1 42. Rd5 (42. Qd3+ $142 g6 43. h5 Rxa2+ 44. Kh3) 42... Rc1 43. h5 Rc5 (43... Rc6 $142 44. Rd8 Rf6 45. Qd3+ g6 46. hxg6+ Qxg6) 44. Rd8 {White is clearly winning.} Rc7 45. Bf3 {Threatens to win with Be4+.} Re7 (45... Qf5 $142) 46. Qc2+ g6 47. hxg6+ {Accuracy: White = 86%, Black = 53%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.19"]
[Round "7.5"]
[White "Kriebel, Tadeas"]
[Black "Nguyen, Thai Dai Van"]
[Result "1/2-1/2"]
[ECO "D43"]
[WhiteElo "2524"]
[BlackElo "2560"]
[Annotator "TA"]
[PlyCount "72"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 22,72,0,0,0,0,10,12,28,28,37,37,33,41,60,17,47,39,27,10,10,17,10,10,10,10,10,10,22,6,26,26,26,26,26,5,8,0,0,0,0,0,26,26,26,26,26,26,26,0,6,0,26]} 1. d4 d5 2. c4 e6 3. Nf3 Nf6 4. Nc3 c6 5. cxd5 exd5 6. Bf4 Bd6 7. Bxd6 Qxd6 8. e3 Bf5 9. Bd3 Bxd3 10. Qxd3 O-O 11. O-O Nbd7 12. h3 Rfe8 {D35: Queen's Gambit Declined: Exchange Variation.} 13. Nd2 Re6 14. b4 {[%cal Bb2b4,Bb4b5][%mdl 32] [#]} Rae8 $146 ({Predecessor:} 14... a6 15. a4 Rae8 16. b5 c5 17. dxc5 Nxc5 18. Qd4 Nfe4 19. Ndxe4 dxe4 20. Rad1 Qe5 21. Qxe5 Rxe5 {0-1 (52) Gauglitz,G (2413)-Krivoshey,S (2498) Germany 2003}) 15. b5 c5 16. dxc5 Nxc5 17. Qd4 Rc8 18. Rac1 Ree8 19. Rfd1 Red8 20. Nde4 (20. Nf3 {feels hotter.} a5 21. Ne2 Qb6 22. a4 Qd6 23. Qc3) 20... Nfxe4 21. Nxe4 Nxe4 22. Rxc8 Rxc8 {[#]} 23. Qxe4 $1 {[%mdl 512]} dxe4 24. Rxd6 $11 {[%mdl 4096] Endgame KR-KR} g6 25. Rd7 Rc2 26. a3 Ra2 27. Rxb7 Rxa3 28. Kh2 Kg7 29. Kg3 g5 30. h4 h6 31. Kg4 Kg6 32. h5+ Kf6 33. b6 axb6 34. Rxb6+ Kg7 35. Rb4 Ra5 36. Kg3 Re5 {Accuracy: White = 90%, Black = 85%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.20"]
[Round "8.1"]
[White "Stefansson, Hannes"]
[Black "Piorun, Kacper"]
[Result "0-1"]
[ECO "B91"]
[WhiteElo "2529"]
[BlackElo "2611"]
[Annotator "TA"]
[PlyCount "100"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 24,100,29,42,48,43,59,39,43,39,46,0,50,50,50,50,58,51,58,43,43,43,50,50,50,21,37,20,23,0,33,29,20,0,0,0,0,0,0,0,0,0,0,0,0,-16,-22,-97,-97,-97,-97,-97,-97,-97,-97,-97,-97,-123,-123,-123,-97,-97,-97,-97,0,-97,0,-123,-123,-123,-123,-592,-592,-592,-580,-553,-488,-484,-477]} 1. e4 c5 2. Nf3 d6 3. d4 Nf6 4. Nc3 cxd4 5. Nxd4 a6 6. g3 e5 7. Nde2 Be7 8. Bg2 O-O 9. O-O Nbd7 10. a4 b6 11. Nd5 Nxd5 12. Qxd5 Rb8 13. Nc3 Nf6 {B91: Sicilian Najdorf: 6 g3.} 14. Qd3 h6 15. b3 Qc7 {White is slightly better.} 16. Ba3 {[#]} Bd7 $146 ({Predecessor:} 16... Rd8 17. Rac1 Qb7 18. f4 b5 19. axb5 axb5 20. Bb4 Be6 21. f5 Bc4 22. Qd2 Bxf1 23. Rxf1 {1-0 (47) Bender,Z (2002)-Kovacevic,K (2117) Zagreb 2019}) 17. Bb4 b5 (17... a5 $5 18. Ba3 $8 Rfc8 $11) 18. axb5 axb5 19. Rfd1 Rfc8 20. Qe3 Ra8 21. Rxa8 Rxa8 22. Qd3 Bf8 23. Bf3 Rc8 24. Kg2 ({Much worse is} 24. Nxb5 Bxb5 25. Qxb5 Qxc2 $15) 24... Qb6 25. Rd2 (25. Ra1 {feels hotter.} Qd4 26. Qxd4 exd4 27. Ne2 d5 28. e5) 25... Bc6 26. Qe2 ({Avoid the trap} 26. Bxd6 $2 Rd8 $19) 26... Qb8 27. h4 Qa8 {[#] Hoping for ...d5.} 28. Bxd6 b4 29. Na4 $1 {[%cal Ra4b6]} Nxe4 30. Bxe4 Bxe4+ 31. f3 Bxd6 32. Qxe4 Qxe4 33. fxe4 Bc5 34. Nxc5 Rxc5 $11 {[%mdl 4096] Endgame KR-KR} 35. Rd8+ (35. h5 $11 {keeps the balance.}) 35... Kh7 $17 36. Rb8 Rxc2+ 37. Kh3 h5 38. Rxb4 f6 39. Rc4 Re2 40. Ra4 Kh6 41. Rc4 Kg6 42. Rb4 Rb2 43. Rb7 Re2 44. Rb4 $1 Kh6 45. Rc4 $1 g5 46. hxg5+ Kxg5 47. b4 $2 {[%mdl 8192] [#] This costs White the game.} (47. Rb4 $17) 47... Rb2 $19 {Black is clearly winning.} 48. Rc3 Rxb4 49. Re3 Rb2 50. Re1 Rb3 {Accuracy: White = 78%, Black = 90%.} 0-1

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.20"]
[Round "8.2"]
[White "Bartel, Mateusz"]
[Black "Van Foreest, Jorden"]
[Result "1/2-1/2"]
[ECO "D12"]
[WhiteElo "2639"]
[BlackElo "2667"]
[Annotator "TA"]
[PlyCount "96"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,96,31,31,15,22,25,37,21,22,23,23,6,37,35,31,39,38,17,41,42,48,24,41,19,35,37,25,58,34,-28,0,0,0,0,17,13,16,17,52,58,51,0,0,0,0,0,0,0,24,31,21,0,0,0,0,0,31,54,88,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. c4 c6 2. d4 Nf6 3. Nf3 d5 4. e3 Bf5 5. Nc3 e6 6. Nh4 Bg6 7. Be2 {D12: Slav Defence: 3 Nf3 Nf6 4 e3 Bf5.} Nbd7 8. O-O Bd6 9. g3 {White is slightly better.} O-O 10. Nxg6 hxg6 11. Rb1 a5 12. b3 Qe7 13. Bb2 {[#]} Rfd8 $146 ({Predecessor:} 13... Ba3 14. Ba1 Rfd8 15. Bf3 Bb4 16. Bg2 e5 17. cxd5 Bxc3 18. d6 Qxd6 19. Bxc3 e4 {1-0 (76) Wang,H (2737)-Artemiev,V (2761) Danzhou 2019}) 14. Bf3 Rab8 15. Qe2 Ba3 16. Ba1 e5 17. cxd5 exd4 18. dxc6 {Strongly threatening c7.} d3 $1 {[%cal Rd3e2]} 19. Qd1 {aiming for c7.} (19. Qxd3 $2 Ne5 $19) 19... bxc6 20. Na4 ({But not} 20. Qxd3 $2 Ne5 $19) ({White should play} 20. Bxc6 $14 d2 21. Bg2 (21. Qxd2 $2 Ne5 $19 {[%mdl 64] Discovered Attack})) 20... Ne5 21. Bg2 g5 22. Bc3 Rb5 23. Nb2 Bxb2 24. Rxb2 Nd5 25. Bd4 Rb4 26. Rd2 (26. Bxe5 $14 Qxe5 27. Rd2) 26... Rxd4 $1 $11 {[%mdl 64] [#] Remove Defender} 27. exd4 Nc3 28. Qe1 Rxd4 29. Qe3 Ne2+ 30. Rxe2 dxe2 31. Qxe2 (31. Qxd4 {is more complex.} Qf6 32. Qc3 exf1=R+ 33. Kxf1 Qd6 34. Be4) 31... Qd6 32. Qa6 Qd8 33. Re1 ({Wrong is} 33. Bxc6 $2 Rd6 $19) 33... f6 34. Bxc6 Kh7 35. Qe2 ({Better is} 35. h3 $16) 35... Kh6 {The position is equal.} 36. Be4 Rd2 37. Qf1 {[%cal Rf1h3]} g4 38. h3 Qd4 39. hxg4 {Intending Qh3+ and mate.} Kg5 40. Kg2 {Threatens to win with Re2.} Nxg4 {[%cal Rd2f2]} 41. Re2 $40 {[%mdl 128] Black needs to defend precisely.} Rd1 42. f4+ Kh6 43. Qf3 Rd2 {With the idea ...f5.} 44. Qxg4 {[%cal Rg4h4]} Qxe4+ $1 {[%mdl 64] [#] Double Attack} 45. Kf2 Qd4+ 46. Kg2 Qe4+ 47. Kf2 Qd4+ 48. Kg2 Qe4+ {Accuracy: White = 90%, Black = 86%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.20"]
[Round "8.3"]
[White "Nguyen, Thai Dai Van"]
[Black "Esipenko, Andrey"]
[Result "1/2-1/2"]
[ECO "E46"]
[WhiteElo "2560"]
[BlackElo "2654"]
[Annotator "TA"]
[PlyCount "110"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 13,110,0,0,0,0,0,0,0,6,21,25,6,34,16,29,24,24,17,17,17,32,33,34,24,29,20,37,44,37,33,46,18,17,24,45,43,51,47,60,14,18,14,46,56,48,0,0,0,0,0,71,71,71,71,71,71,72,72,92,72,90,71,71,0,91,0,71,72,106,86,91,90,90,90,90,90,90,70,77,66,77,39,66,66,91,77,91,91,91,91,91,0,0,0,0,0,0,0,0]} 1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. e3 O-O 5. Bd2 d5 6. Nf3 b6 {The main line 6...b6 scores better than 6...c5.} 7. cxd5 exd5 8. Rc1 {E51: Nimzo-Indian: Rubinstein: 4...0-0 5 Nf3 d5.} Be7 9. Bd3 Bb7 10. O-O c5 11. dxc5 bxc5 12. Re1 Nc6 13. Bb1 {[#]} Rc8 $146 ({Predecessor:} 13... Rb8 14. e4 dxe4 15. Nxe4 Nd4 16. Bc3 Nxe4 17. Bxe4 Bf6 18. Qd3 h6 19. Rcd1 Re8 {½-½ (40) Rakhmanov,A (2645)-Sargissian,G (2689) Moscow 2019}) 14. e4 dxe4 $1 15. Nxe4 Nd4 16. Nxd4 cxd4 17. Rxc8 Bxc8 18. Qe2 Qb6 19. b3 Bb7 20. Nxf6+ Bxf6 21. Bd3 Qc5 22. Rc1 Qd5 {[%csl Gb7][%cal Rd5g2] [#]} 23. f3 Qd8 24. Bf4 Re8 25. Qd2 h6 26. Re1 Rxe1+ 27. Qxe1 Bd5 28. Qb4 Be7 29. Qxd4 (29. Qb5 {looks sharper.} Bf8 30. h3 Qf6 31. Bd2 Be6 32. Qc6) 29... Bf6 $1 {[%cal Rf6d4]} 30. Be5 ({Wrong is} 30. Qxa7 $2 Be4 $19) 30... Bxe5 31. Qxe5 Bxb3 (31... Bxf3 $1 $11 {keeps the balance.} 32. gxf3 Qxd3) 32. axb3 $16 Qxd3 $11 {[%mdl 4096] Endgame KQ-KQ} 33. Qe8+ Kh7 34. Qxf7 a5 35. Qe6 Qd2 36. Qe4+ Kh8 37. Qe8+ Kh7 38. Qe4+ Kh8 $1 39. Qe8+ Kh7 40. Qe6 Kh8 41. h3 (41. h4 {seems wilder.} Qd4+ 42. Kf1 Qd2 43. Qc8+ Kh7 44. Qf5+) 41... Qd8 42. Qe3 a4 43. bxa4 {And now Qe4 would win.} Qd1+ 44. Kh2 {[#] Black must now prevent a5.} Qxa4 45. f4 Qc2 46. Qe5 Kh7 47. h4 Qd3 48. h5 Qc2 49. Qe3 Qd1 50. Qe4+ Kg8 51. Qe6+ Kh8 52. g4 (52. Qe8+ $16 Kh7 53. Kg3) 52... Qf3 {The position is equal.} 53. Qe8+ Kh7 54. Qg6+ Kh8 55. Qe8+ Kh7 {Accuracy: White = 88%, Black = 83%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.20"]
[Round "8.4"]
[White "Abasov, Nijat"]
[Black "Cernousek, Lukas"]
[Result "1/2-1/2"]
[ECO "C11"]
[WhiteElo "2670"]
[BlackElo "2442"]
[Annotator "TA"]
[PlyCount "94"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 14,94,25,13,18,12,31,0,1,0,5,7,6,7,10,6,15,0,0,0,8,6,2,-15,-16,-12,7,-7,244,8,12,0,0,0,62,27,33,-6,-6,-6,-6,-6,0,0,3,0,19,22,21,18,22,8,25,27,41,41,41,41,56,17,17,-14,-14,-14,17,0,0,0,22,17,17,17,17,17,22,22,22,22,22,22,22,17,17]} 1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 dxe4 5. Nxe4 Nbd7 6. Nxf6+ Nxf6 7. Nf3 c5 8. c3 cxd4 {C13: French: Classical System: 4 Bg5 Be7, Alekhine-Chatard Attack.} 9. Nxd4 {next Bb5+ is good for White.} Be7 10. Bd3 Qd5 11. Nf3 Bd7 12. Qe2 Bc6 13. O-O h6 {[#]} 14. Bf4 $146 ({Predecessor:} 14. c4 Qa5 15. Bd2 Bb4 16. Bf4 Qh5 17. Ne5 Qxe2 18. Bxe2 Be4 19. Rad1 Be7 20. Be3 {½-½ (67) Varga,Z (2455)-Golubovic,B (2450) Medulin 1997}) 14... O-O 15. Be5 Nd7 16. Bg3 Nc5 17. Bc2 Ne4 18. Rfd1 Nxg3 19. hxg3 Qb5 (19... Qh5 {feels hotter.} 20. Qd3 g6 21. Qe3 Rfd8 22. Ne5 Bg5) 20. Bd3 Bxf3 $2 {[%mdl 8192] [#]} (20... Qb6 $11) 21. gxf3 $2 ({And not} 21. Bxb5 Bxe2 22. Bxe2 Rfd8 $11) ({White must play} 21. Bh7+ $1 $18 {[%mdl 512]} Kxh7 22. Qxb5 Bxd1 23. Rxd1) 21... Qc6 $11 22. Be4 Qc7 23. Qb5 {Rd7 is the strong threat.} Bc5 (23... Rfd8 $11) 24. Kg2 Rfd8 25. a4 Rab8 26. a5 b6 27. a6 Be7 28. f4 Qc5 29. Qe2 Rxd1 (29... g6 {with more complications.} 30. Rd4 Rxd4 31. cxd4 Qc7 32. Rd1 Rd8) 30. Rxd1 {[#] Threatens to win with Rd7.} Rd8 31. Rxd8+ Bxd8 32. Qd3 Qe7 33. Qb5 g6 34. Qc6 Kg7 35. Qa8 b5 36. Qb8 b4 {The position is equal.} 37. Qe5+ Kg8 38. Qb8 Kg7 39. cxb4 Bb6 40. Qe5+ Qf6 (40... Kg8 {is more complex.} 41. b5 Qb4 42. Bd3 Qd2 43. Qb8+ Kh7) 41. Qd6 {Hoping for Qxb6!} Qd4 42. Qxd4+ Bxd4 {KB-KB} 43. b5 h5 44. Bc6 Kf6 45. f3 Bb6 46. b3 Ke7 47. Kf1 Kf6 {Accuracy: White = 79%, Black = 90%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.20"]
[Round "8.5"]
[White "Krejci, Jan"]
[Black "Kriebel, Tadeas"]
[Result "0-1"]
[ECO "D56"]
[WhiteElo "2559"]
[BlackElo "2524"]
[Annotator "TA"]
[PlyCount "124"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,124,20,12,23,17,26,0,30,18,17,0,23,26,9,17,25,24,35,35,35,31,39,31,39,31,39,29,43,24,27,24,39,25,29,28,27,1,0,0,15,5,8,5,7,8,22,0,0,-42,-45,-91,-84,-83,-79,-85,-81,-81,-60,-81,-77,-82,0,-75,0,-74,-80,-81,-81,-87,-83,-144,-158,-138,-158,-158,-151,-144,-144,-142,-123,-380,-365,-365,-350,-309,-279,-936,-957,-819,-199,-779,-588,-588,-588,-275,-275,-1135,-1054,-1977,-1854,-4706,-4714,-29985,-29986,-29988,-29989]} 1. Nf3 d5 2. d4 Nf6 3. c4 e6 4. Bg5 Be7 5. e3 h6 6. Bh4 O-O 7. Nc3 Ne4 8. Bxe7 Qxe7 9. Rc1 c6 10. Bd3 Nxc3 11. Rxc3 dxc4 {D56: Queen's Gambit Declined: Lasker Defence.} 12. Bxc4 Nd7 13. Qc2 b6 {The position is equal.} 14. Bd3 c5 15. Bh7+ Kh8 16. Be4 Rb8 17. O-O Nf6 18. dxc5 Nxe4 19. Qxe4 {Black must now prevent c6.} bxc5 20. b3 Bb7 21. Qf4 Bxf3 22. Qxf3 {[#]} Rbd8 $146 ({Predecessor:} 22... Rfd8 23. Rfc1 Rd2 24. R1c2 Rbd8 25. g3 Rxc2 26. Rxc2 Rd5 27. Kg2 Kg8 28. e4 Rd4 {0-1 (42) Loiseau,Q (2419)-Laurent,J (2221) Belgium 2015}) 23. Rc2 Rd5 24. Rfc1 Rfd8 25. h3 Qd6 26. Qe2 (26. g3 {keeps more tension.} f5 27. Kg2 Qb6 28. Re2 Rd3 29. Rc4) 26... f5 27. g3 a5 28. e4 Re5 29. Rc4 Qd2 30. Qxd2 Rxd2 $11 {[%mdl 4096] Endgame KRR-KRR} 31. a4 fxe4 32. Rxc5 Red5 $1 33. Rc8+ Kh7 34. Re1 Rf5 35. Rxe4 Rfxf2 36. Rc3 Rg2+ 37. Kh1 Rh2+ $1 38. Kg1 Rdg2+ $1 39. Kf1 Ra2 {[%cal Rh2h1]} 40. Kg1 Rag2+ 41. Kf1 Ra2 {[%cal Rh2h1]} 42. Kg1 Rhb2 43. Kf1 Rf2+ 44. Kg1 Rg2+ 45. Kh1 (45. Kf1 $142) 45... Rgb2 $17 46. Re1 Rh2+ 47. Kg1 Rxh3 48. Rxe6 Rhh2 49. Rf3 Rhb2 {...Rb1+ is the strong threat.} 50. Ree3 $2 {[%mdl 8192] This move loses the game for White.} (50. Rb6 $17 {was worth a try.}) 50... Kg6 $1 $19 {[%cal Rg6h5]} 51. Rf4 Kh5 52. Rh4+ {[#]} Kg5 $1 {( -> ...Rb1+)} 53. Rf4 $2 (53. Re5+ Kf6 54. Re1) 53... Ra1+ 54. Rf1 Rxf1+ 55. Kxf1 {KR-KR} Kg4 56. Rd3 g5 57. Rc3 Kh3 58. Rd3 $2 {[#]} (58. Rc6 Kxg3 59. Rxh6) 58... g4 $1 59. Re3 h5 60. Re5 h4 61. Rxa5 Kxg3 62. Rc5 h3 {Accuracy: White = 57%, Black = 98%.} 0-1

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.21"]
[Round "9.1"]
[White "Esipenko, Andrey"]
[Black "Krejci, Jan"]
[Result "1/2-1/2"]
[ECO "A19"]
[WhiteElo "2654"]
[BlackElo "2559"]
[Annotator "TA"]
[PlyCount "106"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,106,0,13,0,8,8,41,40,53,43,47,43,62,48,46,47,66,14,20,0,26,22,53,30,26,26,25,33,19,27,64,51,50,49,104,98,100,70,72,58,61,62,75,80,77,84,84,91,90,88,90,84,79,81,119,119,124,0,0,-9,-10,-8,0,-19,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]} 1. c4 Nf6 2. Nc3 e6 3. e4 c5 4. e5 Ng8 5. d4 cxd4 6. Qxd4 Nc6 7. Qf4 {A19: English Opening: Flohr-Mikenas System with 3...c5.} d6 8. Nf3 dxe5 9. Nxe5 {[%csl Ge5][%cal Rf4f7] [#]White is slightly better.} Nf6 $146 ({Predecessor:} 9... Nxe5 10. Qxe5 Nf6 11. Nb5 Bb4+ 12. Nc3 Bxc3+ 13. Qxc3 O-O 14. Bd3 Qc7 15. Bg5 Ng4 {½-½ (27) Kudla,A (2089)-Budrewicz,H (2000) Poland 2005}) 10. Nxc6 bxc6 11. Qf3 Bb7 12. Bf4 Bb4 13. Bd3 Qe7 14. Be5 (14. O-O $14) 14... Nd7 $11 15. Bxg7 Rg8 16. Bd4 {Threatening 0-0.} Qd6 17. O-O-O $36 {[%mdl 2048] White is more active.} Qxd4 18. Bxh7 Ne5 19. Rxd4 Nxf3 20. gxf3 Rg7 21. Be4 f5 22. Bc2 Bxc3 ({Black should try} 22... Bc5 $14 23. Rd2 Rd8) 23. bxc3 $16 c5 24. Rd3 Ke7 25. Re1 Kf6 26. f4 Rh8 27. Rd6 Re7 28. Re5 {Hoping for Rxf5+.} Kf7 29. Rxc5 Rxh2 30. Rd2 Rh4 31. Rd4 Rh2 32. Ra5 Rxf2 33. Rxa7 Kf6 {[#]} 34. Ra4 (34. Bb3 $1 $16) 34... Rg7 $11 {The position is equal.} 35. c5 Rgg2 36. Bb3 Bf3 {Threatens to win with ...Rf1+.} 37. Bd1 (37. Ra6 {keeps more tension.} Rg1+ 38. Bd1 Rxd1+ 39. Rxd1 Bxd1 40. Kxd1 Rxf4 41. Kc2) 37... Bxd1 38. Rxd1 Rxa2 39. Rxa2 Rxa2 {[%mdl 4096] Endgame KR-KR} 40. Rd4 Ra5 41. Rc4 {c6 is the strong threat.} Ke7 42. Kd2 Kd7 43. Rd4+ Kc7 44. Kd3 Rxc5 45. Rc4 Rxc4 $1 46. Kxc4 {KPP-KPP} Kd6 47. Kd4 {White threatens c4 and mate.} e5+ $1 48. fxe5+ {KPP-KP} Ke6 49. c4 f4 50. c5 {White wants to mate with c6.} f3 {( -> ...f2)} 51. Ke3 {Intending c6 and mate.} Kxe5 52. Kxf3 Kd5 53. c6 Kxc6 {Accuracy: White = 91%, Black = 90%.} 1/2-1/2

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.21"]
[Round "9.2"]
[White "Piorun, Kacper"]
[Black "Abasov, Nijat"]
[Result "0-1"]
[ECO "B45"]
[WhiteElo "2611"]
[BlackElo "2670"]
[Annotator "TA"]
[PlyCount "80"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 11,80,22,28,24,24,24,31,31,30,33,25,23,23,28,21,22,27,26,28,19,26,25,16,0,0,0,37,0,0,0,-11,-53,-47,-202,-206,-189,-177,-189,-170,-177,-178,-163,-187,-127,-127,-125,-129,-157,-123,-170,-151,-212,-217,-387,-420,-435,-435,-466,-459,-507,-562,-555,-555,-540,-534,-526,-448,-797,-780,-811,-767]} 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nc6 5. Nc3 Nf6 6. Ndb5 Bc5 7. Nd6+ {B45: Sicilian Four Knights.} Ke7 $1 8. Bf4 e5 9. Nf5+ {White is slightly better.} Kf8 10. Bg5 d6 11. Bd3 h6 12. Bxf6 Qxf6 13. Nd5 {[#]} Qd8 $146 ({Predecessor:} 13... Qg5 14. Nfe3 Be6 15. O-O h5 16. Kh1 Rh6 17. c3 a6 18. Qe2 Rc8 19. Rae1 Kg8 20. b4 Ba7 {0-1 (69) Abergel,T (2125)-Gervasio,R (2330) Paris 1998}) 14. c3 g6 15. Nfe3 a6 16. h4 h5 17. Qe2 Be6 18. g3 Kg7 19. O-O-O b5 20. a3 Ne7 21. Bc2 a5 22. b4 $2 {[#]} ({White should try} 22. Qxb5 $15 Nxd5 23. exd5) 22... axb4 $1 $19 23. axb4 Bxe3+ $1 24. Qxe3 Bxd5 25. exd5 Ra2 {Hoping for ...Qa8.} 26. Bb3 Nf5 27. Qe1 Ra7 {[%cal Ba2a7,Ba7e7,Be7e5][%mdl 32]} 28. Kb2 Qb6 29. Qd2 e4 ({And not} 29... Qa6 30. Ra1 $11) 30. Ra1 Re7 31. Rhe1 (31. Bc2 $17) 31... Rhe8 32. Bc2 $2 (32. Qf4 e3 33. Bc2) 32... e3 33. fxe3 Nxe3 {( -> ...Nc4+). Black is clearly winning.} 34. Bd3 Re5 35. Re2 Rxd5 36. Kb3 {[#]} Nc4 $1 {[%mdl 512]} 37. Qc2 (37. Bxc4 Rxd2) 37... Rxe2 38. Qxe2 Re5 39. Qg2 (39. Qd1 $142 d5 40. Bc2) 39... d5 40. Rd1 Qe6 {Accuracy: White = 57%, Black = 93%.} 0-1

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.21"]
[Round "9.3"]
[White "Van Foreest, Jorden"]
[Black "Stefansson, Hannes"]
[Result "1-0"]
[ECO "C50"]
[WhiteElo "2667"]
[BlackElo "2529"]
[Annotator "TA"]
[PlyCount "85"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,85,15,19,15,14,10,14,15,24,0,8,9,27,27,34,34,33,17,34,31,45,35,39,30,58,61,91,82,77,67,83,81,80,83,124,104,145,115,144,135,166,162,177,174,177,183,174,156,156,158,162,139,146,141,142,145,166,145,163,159,163,146,293,293,286,286,268,291,406,225,424,418,564,543,527,482,387,402]} 1. e4 e5 2. Nf3 Nc6 3. Bc4 Bc5 4. d3 Nf6 5. a4 O-O 6. a5 {C50: Hungarian Defence and Giuoco Pianissimo.} a6 7. O-O h6 8. c3 {The position is equal.} d6 9. h3 Ba7 10. Be3 Ne7 11. Bxa7 Rxa7 12. Re1 Ng6 {[#]} 13. Nbd2 $146 ({Predecessor:} 13. Kh2 Nf4 14. Ng1 Ng4+ 15. hxg4 Qh4+ 16. Nh3 Bxg4 17. f3 Nxh3 18. g3 Qg5 19. fxg4 {1-0 (36) Hepting,H (2025)-Junker,R (2080) Bechhofen 1994}) 13... Re8 14. d4 Be6 15. Bf1 Qc8 16. b4 exd4 17. cxd4 d5 18. e5 Nd7 19. Qc2 Ra8 20. Rac1 c6 21. Nb3 Re7 22. g3 Qe8 23. Nfd2 f5 24. Bd3 Qf7 25. Nf1 Ree8 26. Ne3 Ne7 27. f4 g6 28. Re2 Kh8 29. Rf1 Rg8 30. Rg2 Rg7 31. Kh2 Rf8 32. Qb1 Qg8 33. Qe1 Rgf7 34. Nc1 Qh7 35. Ne2 Qg8 {This costs Black the game.} (35... Rg8 $16 36. Nc3 Nc8) 36. g4 $18 Qh7 37. Qh4 Rg8 38. Rfg1 Nf8 39. Bb1 (39. gxf5 $142 Bxf5 40. Nxf5 Rxf5 41. Bxf5 Nxf5 42. Qf6+ Qg7 43. Rxg6 Nxg6 44. Qxf5) 39... Bc8 $2 {[#]} (39... h5) 40. gxf5 Nxf5 41. Nxf5 Bxf5 42. Bxf5 Rxf5 43. Ng3 {Accuracy: White = 90%, Black = 60%.} 1-0

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.21"]
[Round "9.4"]
[White "Cernousek, Lukas"]
[Black "Nguyen, Thai Dai Van"]
[Result "0-1"]
[ECO "B56"]
[WhiteElo "2442"]
[BlackElo "2560"]
[Annotator "TA"]
[PlyCount "70"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 20,70,37,28,31,46,58,51,29,0,29,23,31,35,16,21,26,-93,-81,-93,-85,-91,-80,-86,-95,-117,-111,-135,-116,-127,-116,-201,-189,-179,-188,-234,-236,-235,-235,-205,-202,-307,-304,-300,-291,-321,-315,-296,-245,-311,-311,-354,-366]} 1. e4 c5 2. Nf3 Nc6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. f3 e5 7. Nb3 Be6 8. Be3 Be7 9. Qd2 O-O 10. O-O-O a5 11. Bb5 {11.Bb5 scores better than 11.Kb1.} Qb8 {B56: Classical Sicilian: Unusual Lines.} 12. Kb1 Na7 13. Be2 Nc6 {White is slightly better.} 14. Bb5 Rc8 15. Nd5 Bxd5 $1 16. exd5 a4 17. Na1 a3 18. b3 {[#]} ({Wrong is} 18. dxc6 $2 bxc6 19. c3 cxb5 $19) (18. b4 $1 $11) 18... Nd4 $5 $146 {[%cal Rd4b5][%mdl 8] White is on the road to losing. An interesting novelty.} ({Predecessor:} 18... Na7 19. Be2 Qc7 20. c4 Rcb8 21. Nc2 Nc8 22. Qb4 Bd8 23. Bc1 Qe7 24. Qc3 Ba5 25. b4 Bc7 26. Nxa3 Nb6 {1-0 (48) Baules,J (2264)-Davila,C (2374) Turin 2006}) 19. Bxd4 exd4 20. Qxd4 {[#]} Rc5 $1 $36 {[%cal Rc5b5][%mdl 2048] Black is really pushing.} 21. c4 Nxd5 $1 22. cxd5 {And now Qd3 would win.} Rxb5 23. Rc1 Bf6 24. Qd3 Rc5 25. b4 {[#]} (25. Rhe1 $17) 25... Rxc1+ $1 $19 26. Rxc1 Qe8 27. f4 Bb2 28. Rd1 Rc8 29. Nc2 g6 30. Nxa3 (30. Qe3 $142) 30... Bxa3 31. Qxa3 {KQR-KQR} Qe4+ 32. Ka1 Qxg2 ({Much less strong is} 32... Qxf4 33. g3 $19) 33. Rc1 Re8 34. Qb2 Qxd5 35. Qf6 {[#]} Qd2 $1 {Accuracy: White = 47%, Black = 95%.} 0-1

[Event "Prague Festival Challengers 2020"]
[Site "Prague"]
[Date "2020.02.21"]
[Round "9.5"]
[White "Kriebel, Tadeas"]
[Black "Bartel, Mateusz"]
[Result "1/2-1/2"]
[ECO "A40"]
[WhiteElo "2524"]
[BlackElo "2639"]
[Annotator "TA"]
[PlyCount "100"]
[EventDate "2020.02.12"]
[EventType "tourn"]
[EventCountry "CZE"]
[SourceTitle "playchess.com"]
[Source "ChessBase"]
[SourceQuality "1"]

{[%evp 9,100,28,35,37,40,14,25,8,12,4,51,47,38,42,45,0,0,0,14,4,4,4,5,11,13,-2,0,0,0,0,0,-41,0,0,0,0,4,12,12,-17,-17,-17,-17,-17,-20,-17,0,0,0,0,0,0,0,0,0,-3,0,-8,-8,-35,-35,-35,-35,-35,-35,-56,-13,-74,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,13,13,16,0,0,0,0]} 1. d4 e6 2. c4 b6 3. Nc3 Bb4 4. e3 Bb7 5. Nge2 f5 6. a3 {A40: Unusual replies to 1 d4.} Be7 7. Ng3 Nf6 8. d5 {White has an edge.} O-O 9. Be2 a5 10. Bf3 {[#]} Qc8 $146 ({Predecessor:} 10... Na6 11. d6 Bxf3 12. dxe7 Qxe7 13. Qxf3 Nc5 14. O-O Ng4 15. Qe2 Qh4 16. h3 Ne5 {1-0 (59) Golikov,D (2114)-Stoleriu,G (2247) Khanty-Mansiysk 2016}) 11. O-O Na6 12. dxe6 dxe6 13. e4 fxe4 14. Ngxe4 Nc5 15. Nxc5 Bxc5 16. Bxb7 Qxb7 17. Qe2 e5 18. Bg5 Bd4 19. Bxf6 Rxf6 20. Kh1 Raf8 {[%cal Rf6f2]} (20... Bxc3 $5 21. bxc3 Re8 $15) 21. Ne4 $1 {[%cal Re4f6]} Rf4 22. Rae1 $1 a4 23. f3 Qc6 24. g3 R4f7 25. h4 h6 26. Kg2 Rb8 27. Rb1 b5 28. b4 Qxc4 29. Qxc4 bxc4 30. Rbc1 Bb2 31. Rxc4 Bxa3 32. Rb1 Rd7 $36 {[%mdl 2048] Black fights for an advantage.} 33. b5 Rd4 34. Rxc7 Rb4 35. Rxb4 Bxb4 $15 {[%mdl 4096] Endgame KRB-KRN} 36. Nc3 $1 Ba5 37. Rc4 a3 (37... Bxc3 $5 38. Rxc3 Rxb5 39. Rc8+ Kf7 40. Rc7+ Kf6 41. Rc6+ Kf7 $17) 38. Na2 (38. Kh3 $11 {keeps the balance.}) 38... Bd8 (38... Rxb5 $17 {And now ...Rb2+ would win.} 39. Ra4 Rb2+ 40. Kh3 Rxa2 41. Rxa5 Kf7) 39. Ra4 $11 {The position is equal.} Be7 40. Nc3 Kf7 41. Kh3 Rc8 42. Nd5 {[#] Strongly threatening Ra7.} Bc5 43. b6 {[%cal Bb5b6,Bb6b7][%mdl 32]} Rb8 44. Ra5 Bf8 45. Ra6 Bc5 46. Ra5 Bd6 47. Ne3 Rc8 48. b7 Rc3 49. Ra6 Bb8 50. Ra8 Rxe3 {Accuracy: White = 85%, Black = 89%.} 1/2-1/2

