[Event "Grenke Chess Open 2024"] [Site "Karlsruhe, Germany"] [Date "2024.04.01"] [Round "9.6"] [White "Kazakouski, Valery"] [Black "Tiglon, Bryce"] [Result "0-1"] [WhiteElo "2606"] [BlackElo "2509"] [Annotator "https://lichess.org/@/ralphptorres"] [Variant "Standard"] [ECO "D91"] [Opening "Grünfeld Defense: Three Knights Variation, Petrosian System"] [Source "https://lichess.org/study/b0uX2KYO/VjIrotbp"] [Orientation "white"] 1. d4 Nf6 2. c4 g6 3. Nc3 d5 4. Nf3 Bg7 5. Bg5 Ne4 6. Bf4 O-O 7. e3 c5 8. cxd5 Nxc3 9. bxc3 Qxd5 10. Be2 cxd4 11. cxd4 Nc6 12. O-O Qa5 13. Nd2 Qd8 14. Rb1 e5 15. dxe5 Bxe5 16. Bxe5 Nxe5 17. Rb5 Qe7 18. Ne4 a6 19. Rb6 Nd7 20. Qd4 Qe5! (20... Nxb6?? 21. Nf6+ Kh8 (21... Kg7 22. Nh5+ $18) 22. Nd5+ $18) 21. Rd6 Qxd4 22. exd4!? { White makes the unusual, but justified, decision to enter into an IQP structure despite the queens having already traded off the board. Of course, with no pawn on e6 or c6, this is not a true IQP structure, and the passed d-pawn is an asset. } 22... Re8 23. Bf3 Kg7 24. Rc1 Nf8 25. h3 Be6 26. a4 Rad8 27. d5 Rc8 28. Rxc8 Bxc8 29. Rb6 Nd7 30. Rb2 Ne5 { With excellent play in this phase of the game from Black, the d-pawn has failed to make its presence felt, and Black's pieces have made the most out of the few squares they could use. } 31. a5 Rd8 32. Nc3 Nc4 33. Ra2 Bd7 34. Be2 Rc8 35. Ne4 f5 36. Ng5 h6 37. Nf3 Kf6 38. Rc2 Nd6 39. Rxc8 Bxc8 $17 { Without rooks, and with Black's knight blockading the d-pawn, Black is now for choice. } 40. Kf1 g5 41. Ke1 g4 42. hxg4 fxg4 43. Nd2 Ke5 44. Nc4+ (44. Nf1 { would force Black to activate his king. } 44... Kxd5? (44... Kd4 45. Ne3 (45. g3 Nc4 46. Nh2 Ne5 $17) 45... g3! $17) 45. Ne3+ Kd4 46. Nxg4 $10) 44... Nxc4 45. Bxc4 Bf5 (45... Kd4 { was also a try, but } 46. Ba2 Kc5 47. Kd2 h5 48. g3 Kb4 49. d6 Kxa5 50. Bd5 Kb6 51. Kd3 Bd7 52. Kd4 { should hold, with Black's kingside pawns fixed to weak squares. } 52... a5 53. Be4 a4 54. Kc4 Ka6 55. Kb4 b5 56. Bd5 $10) 46. Kd2 Be4 47. g3 Bxd5 48. Be2 Be6 { As compensation for the pawn, White can be happy about the weak pawns on b7 and, for the moment, g4. } 49. f3?? { The losing move. } (49. Ke3 Bf5 50. f4+ gxf3 (50... Kf6 51. Bd3 $10) 51. Bxf3 Bc8 $10) 49... gxf3 50. Bxf3 Bd5 51. Be2 { Compared to lines with 49. Ke3, note that now Black's king can control more of the center. } 51... Kd4 { Black shows the power of same-colored bishops, completely shutting White's bishop out of attacking the fixed weakness on b7. The king now makes its way towards the g3-pawn, as Black's h-pawn promotes on the right-colored square. } 52. Bf1 Bf3 53. Bd3 Bg2 54. Be2 Ke4 55. Bg4 Bf3 56. Bh3 Bh1 57. Bg4 Bg2 58. Be2 Bh3 59. Bh5 Bf1 60. Bg4 Bg2 61. Be2 { Black now decides to probe the other weak pawn! } 61... Kd4 62. Bd3 Bd5 63. Be2 Bc6 64. Bf1 Kc5 65. Kc3 Bd5 66. Be2 Bc6 67. Bf1 b6 68. axb6 a5 69. Bc4 Kxb6 70. Kd4 Be8 71. Bd3 Bf7 72. Bc2 Kb5 73. Kc3 a4 74. Bd3+ Kc5 75. Bc2 a3 76. Bd1 Be6 77. Be2 Kd6 78. Bd3 Ke5 79. Bc2 a2 80. Kb2 Kd4 81. Bg6 Ke3 { and back to the g3-pawn! } 82. Bh5 Bd5 83. Ka1 Kf2 84. g4 Kg3 85. Kb2 Kh4 86. Ka1 Kg5 87. Kb2 Kf6 88. Be8 Be6 89. Ka1 Ke7 90. Bg6 Kf8 91. Kb2 Kg8 92. Ka1 Kh8 93. Kb2 Kg7 94. Be8 Kf6 95. Ka1 Kg5 96. Bh5 Bxg4 97. Bf7 Kf6 98. Bxa2 Be6 99. Bb1 Bf5 100. Ba2 Be6 101. Bb1 h5 102. Kb2 h4 103. Be4 h3 104. Kc3 Ke5 { 0-1 Black wins. } 0-1