Stockfish – Leela Chess Zero
Top Chess Engine Championship Season 17 — Superfinal; match game 77; tcec-chess.com, April 18, 2020
Chigorin Defence D07
Stockfish has finally won a game. 1. d4 d5 2. c4 Nc6 3. Nf3 Bg4 4. cxd5 Bxf3 5. gxf3 Qxd5 6. e3 e5 7. Nc3 Bb4 8. Bd2 Bxc3 9. bxc3 Qd6 10. Qb3. This is also (but not only!) an inversion of moves with 10. Rb1. 10. ... Nge7?! Leela Chess Zero pursues a very dubious opening policy, by sacrificing a Pawn for no objective compensation. Probably best is 10. ... 0-0-0 (in order to transpose into known theoretical lines with 11. Rb1 b6) against which Grandmaster Alexander Sergeyevich Morozevich recommends 11. Be2 f5 (11. ... Nge7?! 12. Qxf7±) 12. 0-0 Nge7 13. Rfb1 b6 14. a4↑ with White’s initiative going unchallenged. 11. Qxb7 0-0. A rapid chess game between Sergei Yuryevich Shipov (White) and Morozevich (Black) at Moscow in 1992 continued: 11. ... Rb8 12. Qa6 0-0 (12. ... Qg6!? 13. Qd3 f5 14. d5 e4) 13. Bd3! Rb2 and now, instead of 14. Bc1?, White should play 14. Rd1! f5 (14. ... Qd5 15. Be4 Qxa2 16. Qxa2 Rxa2 17. Ke2 Rb8 18. Rb1 is even worse) 15. Bc1 Rb6 16. Ba3± with a clear advantage (Morozevich’s analysis). 12. Rd1!? This “mysterious” Rook move is also a novelty in place of 12. Qb3 as in Orság – Pisk, 18th Czech Chess Championship, Ostrava 2010. 12. ... Rab8 13. Qa6 Rb6 14. Qc4 Rfb8 15. Bd3 exd4 16. cxd4 Nb4 17. Be4 Nbd5 18. Rc1 Qe6 19. Bxd5 Nxd5 20. e4 c6 21. Be3 Nxe3 22. Qxe6 fxe6 23. fxe3 c5 24. dxc5 Rb2
25. 0-0 Rxa2 26. Rf2 Ra6. Exchanging a pair of Rooks with 26. ... Rxf2 27. Kxf2 a5 should not make any difference for the better, since once the a-Pawn and the c-Pawn have disappeared, there arises the same ending as after White’s 42th move. 27. c6 Rc8 28. c7 Kf7 29. h4 Rb6 30. h5 Rb7 31. Rfc2 a5 32. Kf2 a4 33. f4 h6 34. Ke2 a3 35. e5 Ke7 36. Kf3 Rb2 37. Rc4 a2 38. Ra1 Rh2 39. Ke4
39. ... Rb2? Of course, 39. ... Rxh5?? 40. Rxa2+− is totally hopeless. However, Black’s best option was 39. ... Kf7 — here is a sample variation (though anything but forced): 40. Kd4 g6! 41. hxg6+ Kxg6 42. e4 h5 43. Rc6 Kf7 44. f5 Re2 45. Kd3! Rh2! (45. ... Rg2? 46. Rxe6 Rxc7 47. Rh6 Kg7 48. Rxh5 Rcc2 49. Rg5+!+−) 46. Rxe6 Rxc7 47. Ra6 Rh3+ 48. Kd4 Rd7+ 49. Kc5 Rc3+ 50. Kb4 Rdc7 with a draw. 40. Ra4+− Rxc7 41. R1xa2 Rxa2 42. Rxa2 Rc4+. 42. ... Kf7 43. Ra6! also leaves Black no way but resignation. 43. Kd3 Rc7 44. Ra6 Rd7+ 45. Kc4 Rc7+ 46. Kd4 Rd7+ 47. Kc5 Rd5+ 48. Kc6 Kf8. Or 48. ... Rd3 49. Ra7+ Kf8 50. f5 winning as in the game. 49. e4 Rd4 50. f5 Kf7 51. Kc5 Rxe4 52. Ra7+ Kf8 53. Ra8+ Ke7 54. Ra7+ Kf8 55. fxe6 Re1 56. Rf7+ Ke8 57. Rxg7 Rc1+ 58. Kd5 Rd1+ 59. Kc5 Rc1+ 60. Kd5 Rd1+ 61. Ke4 Rf1 62. Ra7 Rf2 63. Rh7 Re2+ 64. Kf5 Rf2+ 65. Kg6 Re2 66. Rb7 Ra2 67. Kxh6 Ra6 68. Kg7 Ra1 69. h6 Rh1 70. h7 Rg1+ 71. Kh8 Rg2 1 : 0.
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