TCEC Season 16 Superfinal Game 39 – AllieStein-Stockfish
|Game||Season 16, Superfinal, Game 39|
|Links|| TCEC archive|
|Position after 14. h6|
1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 cxd4 8. Nxd4 Bc5 9. Qd2 O-O 10. O-O-O a6
End of book moves.
11. Nb3 Be7 12. h4 b5 13. h5 Na5
Novelty in the Lichess master database. 
14. h6 (diagram) g6
White gets a thorn pawn, but black gains some initiative on the queenside as compensation.
Taking the pawn would lose by force after Rxh6 with a decisive attack. For example: 14... gxh6 15. Rxh6 f6 16. Nd4 Nc5 17. Bd3 Rf7 18. Rdh1 f5 19. g4 and black would soon collapse.
Avoiding the capture would allow white to break through. For example: 14... f6 15. hxg7 Rf7 16. Nxd5
|Position after 20... cxb2|
15. Kb1 Nc4 16. Bxc4 dxc4 17. Nd4 b4 18. Ne4 c3 19. Qd3 Qc7 20. Nd6 cxb2 (diagram)
White did not allow black to get the reciprocal thorn pawn, but allowed black to capture the b2 pawn, instead. This is not similarly beneficial to black, as allowing hxg7 would have been for white. White has pieces ready to defend and black cannot open the queenside files easily.
Note also that black cannot win a pawn by taking the white knight on d6. For example: 20... Bxd6 21. exd6 Qxd6 22. Nf5 Qc7 23. Ne7+ Kh8 24. Qd6 Qxd6 25. Rxd6 and black loses a piece.
21. Qe4 Nb6
White offers a temporary piece sacrifice to simplify and clarify the queenside.
|Position after 28. a3|
22. N4b5 axb5 23. Bxb6 Qb8 24. Bc5 Bd7 25. Bxb4 Ra6 26. Rh3 Qa8 27. Qxa8 Rfxa8 28. a3 (diagram)
After the queen exchange, white has a clear advantage. Black b-pawns are weak, and the thorn pawn weakens black's kingside pawn structure and king safety.
|Position after 47. Ne5|
28... Bc6 29. g4 f6 30. exf6 Bxf6 31. Re3 Bd5 32. g5 Bh8 33. Red3 Ra4 34. c3 Rd8 35. Nb7 Rc8 36. Kxb2 Raa8 37. Nd6 Rf8 38. Nxb5 Rfc8
Note that the 38... Rxf4 would not have won a pawn. For instance: 38... Rxf4 39. Nc7 Rb8 40. Nxe6 and the knight cannot be taken because 40... Bxe6 41. Rd8+ Rf8 42. Rxf8+ Rxf8 43. Bxf8 Kxf8 44. Rd8+ Kf7 45. Rxh8 with easily winning endgame for white.
39. Nd6 Rf8 40. Nb5 Rfc8 41. Nd4 Kf7 42. Nc2 Bc6 43. Ne3 Bb5 44. Rd6 Ba4 45. R1d3 Re8 46. Ng4 Kg8 47. Ne5 (diagram)
White offers opposite colored bishops, but black does not oblige. Consequently, the knight shuts down the bishop on h8. The rooks and opposite colored bishops continuation would be with similar themes as in the game continuation. Because of the passed a/c pawns for white and the kingside pawn structure, white is now winning by force.
47... Bb5 48. R3d4 Ba4 49. c4 Reb8 50. Rxe6 Ra7 51. Kc3 Rc8 52. Kd3 52... Rb8 53. Rd5 Rc8 54. Red6 Re8 55. Rb6 Rc7 56. Bd6 Ra7 57. Kd2 Rc8 58. Rd3
Taking the c4-pawn would lead in quick loss: 58... Rxc4 59. Rb8+ mating.
58... Rca8 59. c5 Bxe5 60. Bxe5 Rc8. 1-0
The game was adjudicated as white win by the TCEC win rule.
- https://lichess.org/4vTfajRR#25 (2019-10-05)