1. d4 d5 2. Nf3 Nf6 3. e3 c5 4. Bd3 Nc6 5. O-O Bg4 6. c3 e6 7. Nbd2 Bd6 8. dxc5 Bxc5 9. Qa4 O-O 10. e4 Qc7 11. exd5 exd5 12. Ng5 Ne5 13. Qc2 Nxd3 14. Qxd3 Rfe8 15. Ngf3 Ne4 16. Nd4 Bh5 17. N2b3 Bb6 18. Be3 Bg6 19. Qd1 Qd7 20. Bf4 Nd6 21. Bxd6 Qxd6 22. Re1 Re4 23. f3 Rxe1+ 24. Qxe1 Bc7 25. g3 h5 26. Nb5 Bb6+ 27. Kg2 Qd7 28. N5d4 Re8 29. Qd2 a5 30. Ne2 Be3 31. Qd1 Qb5 32. a4 Qa6 33. Nbd4 Bd3 34. Nf4 Bxf4 35. gxf4 Qg6+ 36. Kf2 Bc4 37. Qd2 Qf6 38. b3 Ba6 39. Kg2 Qe7 40. Rd1 b6 41. Nf5 Qf6 42. Nd4 Bc8 43. Re1 Rf8 44. Re5 Qh4 45. Nf5 Bxf5 46. Rxf5 Rd8 47. Qd4 Rd6 48. Rg5 g6 49. Rxd5 Rxd5 50. Qxd5 Qxf4 51. Qd8+ Kh7 52. Qd5 h4 53. Qd7 Qf6 54. Qd4 Qg5+ 55. Kh3 Qf5+ 56. Qg4 Qd5 57. Qxh4+ Kg8 58. Qe4 Qxb3 59. Qd4 Qe6+ 60. Kg3 f6 61. Kf2 Kf7 62. Kg3 g5 63. Kf2 Qc6 64. Kg3 Qc7+ 65. Kg2 Kg7 66. Kg1 Qb7 67. Kg2 b5 68. axb5 Qxb5 69. c4 Qb7 70. h4 gxh4 71. Qg4+ Kf8 72. Qxh4 Qb2+ 73. Kh3 Qc3 74. Qe4 Qe5 75. Qc6 Ke7 76. Kg2

The position is drawn with best play, per the Lichess Op1 tablebase, but it is tricky for White to defend. Already the move played is one of only five that preserves the draw with best play. The others are 76. Qa8, 76. Qb7+, 76. Qa4 and 76. Kh4.

76... Qe2+ 77. Kg3 Qe1+ 78. Kg2 Qd2+ 79. Kf1 Qd1+ 80. Kf2 a4 81. Qc7+ Qd7 82. Qc5+ Ke6 83. Qb6+ Qd6 84. Qe3+ Qe5 85. Qb6+ Kf5 86. Qb1+ Kg5 87. Qc1+ Qf4 88. Qg1+ Kh6 89. Qh1+ Kg7 90. Qg1+ Kf7 91. Qb1 Qxc4 92. Qh7+ Kf8 93. Qh8+ Ke7 94. Qg7+ Qf7 95. Qg4 Qb3 96. Qg7+ Ke6 97. Qg8+ Ke5 98. Qe8+ Kd4 99. Qe4+?

99. Qd8+= and 99. Kg3= are the only moves to maintain a draw with best play.

99... Kc5?

99... Kc3!.

100. Qe7+= Kc4 101. Qxf6 a3 102. Qc6+ Kb4 103. Qb6+

The game is still drawn with best play, but only because of the 50-move rule. 103. Qd6+!= (only move).

103... Kc3 104. Qf6+?

104. Qc5+ draws under the 50 move rule.

104... Kc2 105. Kg3 a2 106. Qf5+ Kb2?

Now drawn with best play because of the 50 move rule; 106... Qd3, 106... Kd1, or 106... Kd2.

107. Qe5+ Qc3 108. Qb5+?

108. Qe2+ is drawn with best play under the 50 move rule.

108... Qb3?

Now drawn again with best play under the 50 move rule; 108... Kc1 or 108... Kc2.

109. Qe2+ Ka3 110. Qa6+ Qa4?!=

110... Kb2.

111. Qd3+ Kb2 112. Qd2+ Qc2 113. Qb4+ Kc1 114. Qe1+ Qd1 115. Qc3+ Qc2 116. Qe1+ Kb2 117. Qb4+ Qb3 118. Qd2+ Kb1 119. Qe1+ Kc2 120. Qe2+ Kc3 121. Qe3+ Kb4 122. Qb6+ Kc4 123. Qc6+?!

This leaves the game still drawn with best play, but only under the 50 move rule; 123. Qc7+, 123. Qe6+, or 123. Qa7=.

123... Kd3 124. Qe4+ Kd2 125. Qd4+ Ke2 126. Qf2+ Kd3 127. Qf1+ Kd4 128. Qf2+ Ke5 129. Qc5+ Qd5 130. Qe7+?

130. Qc3+ and 130. Qc1 are drawn with best play under the 50 move rule.

130... Qe6?

130... Kd4.

131. Qc5+?

The final error. 131. Qa3 (only move) draws with best play under the 50 move rule.

131... Kf6 132. Qf8+ Kg6 133. Qa8 Qe1+

0-1

Event information: Tournament report.

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