TCEC Season 16 Superfinal Game 64 – Stockfish-AllieStein
|Game||Season 16, Superfinal, Game 64|
|Links|| TCEC archive|
|Position after 19. Rxc4|
1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. e5 Nfd7 5. f4 c5 6. Nf3 Nc6 7. Be3 Qb6 8. Na4 Qa5+ 9. c3
9... Nxd4 Novelty in the Lichess masters database. The position at book exit has seen fair amount of play at the strong GM level. However, the results are favoring white considerably with a 47% win rate for white, and 21% win rate for black.
10. Nxd4 cxd4 11. b4 Qc7 12. Bxd4 Be7 13. Bd3 Nb8 14. O-O b6 15. Rc1 Nc6 16. Bf2 O-O 17. a3 Bb7 18. c4 dxc4 19. Rxc4 (diagram)
White now offers a temporary piece sacrifice by allowing black to fork the rook and the knight. White could have also played Bxc4 to avoid the sacrifice.
Black could not realistically avoid accepting the sacrifice, because of white's underlying threats. For example: 19... Qd8 20. Qc2 g6 21. Be4 Rc8 22. Bxc6 Rxc6 23. Rxc6 Qd5 24. b5 Bxc6 25. Qxc6 and white would be up a clean piece.
|Position after 23. Bxh7+|
19... b5 20. Rc3
The rook is now at the third rank, which is the key enabler for white's next sacrifice. The rook is now ready to go for an attack on the h-file.
20... bxa4 21. b5
Now white gets the piece back due to the pin on the b-file.
21... Rfc8 22. bxc6 Bxc6 23. Bxh7+ (diagram)
White offers the second piece sacrifice. It has to be accepted, as
- 23... Kh8 would lead in a quick loss after 24. Qh5, and black has to start sacrificing pieces to prevent 25. Bg6+ Kg8 26. Qh7+ Kf8 27. Qh8#
- 23... Kf8 would also lose, although the lines are less forced. For example: 24. Qh5 Ke8 25. Bg8 Bxa3 26. f5 and white pries open black defenses decisively.
Remarkably, white never retains the piece back in this game.
|Position after 34. e7|
23... Kxh7 24. Qh5+ Kg8 25. f5 Qxe5 26. Rh3 g6 27. Qh7+ Kf8 28. fxe6 Qg7 29. Be3 Qxh7 30. Rxh7 Kg8 31. Rfxf7 Bf6 32. Rh6 Bb2 33. Rxg6+ Kh8 34. e7 (diagram)
Using the mating threats, white has been able to capture all black's kingside pawns. The e-pawn now ties the black rooks and the light square bishop to prevent queening, and white can simply bring the king and start pushing more pawns.
|Position after 45... a5|
34... Be8 35. Rh6+ Kg8 36. Rf8+ Kg7 37. Rhh8 Kg6 38. Rhg8+ Kh7 39. g4 Rcb8 40. g5 Be5 41. Bc5 Bg6
Black tries to untangle, and indeed, 42. Rxb8 would lead in a draw, as the bishop on e5 protecting Rb8. But white maintains the threats of queening with the next move, keeping black pieces tied up.
42. Rd8 a6 43. Kf2 Bf7 44. h3 Bg6 45. Kf3 a5. 1-0 (diagram)
White wins by TCEC win rule.
Black is here completely lost. The reason is that after 46. Kg4 Bf7 47. Kf5 white is finally winning material decisively. For black, the best short time option would be to play 47... Rxd8 48. exd8=Q Rxd8 49. Rxd8. But after this short sequence, white is an exchange up
with connected passers, and indeed, the game would end in a mate after at most 16 more moves.
- https://lichess.org/RaK9Icnp#17 (accessed on 2019-10-12)