TCEC Season 16 FRC Bonus CPU League 1 Game 22 – Ethereal-Komodo
|Game||Season 16, FRC Bonus CPU League 1, Game 22|
|Links|| TCEC archive|
|FRC start position 69|
The game starting position was 69 (diagram). In this starting position, the a-pawn is not protected and can be attacked simply by pushing the f-pawn. Further, the knights in the corner pose a challenge for development. White and black had different approaches in the game: white pushed the b-pawn to protect the a-pawn whereas black moved the knight to c6 for the same effect.
|Position after 6... Qe6|
1. f4 Nc6 2. b3 f5 3. Ba3 d6 4. c4 e5 5. fxe5
White has moved the bishop to a3 to pin the d6-pawn. At first, it seems that white can win the a7 pawn with 5. fxe5. However, this turns out to be an inaccuracy, as black gets significant compensation from the knight on e5.
5... Nxe5 6. Qxa7 Qe6 (diagram) 7. Qxa8
Black offered the knight in the corner and white accepted the sacrifice. This misplaces the white queen to a8 where it is also subject to tempo-gaining moves. Almost incredibly, white is already practically lost after the next move.
|Position after 11... Bc6|
As compensation for the knight sacrifice, black gets a strong attack.
8. Nc2 O-O 9. Bb2 Qg6 10. O-O Bd7
Black gains an important tempo on the queen while developing the bishop. Note that taking another pawn with 11. Qxb7 would lose the queen for 11... Bc6 threatening 12... Qxg2 mate.
11. Qa5 Bc6 (diagram)
Black is now concretely threatening mate with 12... Qxg2. White has only awkward defensive options, emphasizing the mistake of misplacing the queen earlier with 7. Qxa8. Example lines:
- 12. Rf3 Nxf3+ 13. exf3 Bxe1 14. Qc3 leaves black two exchanges up for a pawn. Also possible with the similar end result was 12. Rf3 Bxe1 13. Bxe5 Bxf3 14. exf3 Rxe5 15. Qa7.
- 12. Qd5+ Bxd5 13. cxd5 and black has a queen for two minors and a pawn, maintaining attack.
- 12. Ne3 Nxc4 13. bxc4 Rxe3 14. Rf2 Rh3 15. Ref1 Rxh2 and white can only delay getting mated with moves like Qd5+. If normal moves are played, the mate comes quickly: 16. Qc3 Rxg2+ 17. Kh1 Rxf2+ 18. Qf3 Bxf3+ 19. exf3 Qg2#
- 12. g3 Bxg3. After the bishop sacrifice, the mate is unavoidable. Trivial delaying moves Qd5+ and e4 aside, black has a beautiful mating line: 13. Rf3 Bxh2+ 14. Kh1 Nxf3 15. Ne3 Nxe1+ 16. Qd5+ Bxd5+ 17. Kxh2 Rxe3 18. cxd5 Qg2.
In the game, white chose the best of bad options.
|Position after 19. Ncd1|
12. e4 Bxe1
The bishop on e1 cannot be taken back. For example: 13. Rxe1 fxe4 with the threat of e3 revealing the Qxg2# mate threat. The mate threat cannot be properly parried: 14. Ne3 Nf3+ 15. Kf1 Nxh2+ 16. Ke2 Re5 17. Bxe5 Qh5+ 18. Ng4 Qxg4+ 19. Ke3 Nf3. Now the king is in the center. The most resilient defense for white is a forced mate: 20. g3 dxe5 21. Qxe5 Qd7 22. Qc5 Qd3+ 23. Kf2 Rf6 24. Qe3 Nxe1+ 25. Qf4 Rxf4+ 26. gxf4 Nf3 27. Bxf3 exf3 28. a3 Qe2+ 29. Kg3 Qg2+ 30. Kh4 Bd7 31. f5 Bxf5 32. d3 Qg4#.
13. Bxe5 Rxe5 14. Qa7 Bh4
After the tactics have been played out, black is now up an exchange for a pawn, still keeping the attack.
15. Nc3 fxe4 16. Rxf8+ Kxf8 17. Ne3 Be1 18. Be2
An interesting try was 18. Kf1 Bxd2 19. Qd4 Qf7+ 20. Ke2 Bc1 21. Ke1 (pre-emptively evading Qh5+) 21... Qf4, but in this line, white will soon lose more material or get mated.
18... Qf7 19. Ncd1 (diagram)
White has managed to stabilize a bit and thwart the immediate mate threats. But this came with the cost of being exchange down in a worse position. Black still has attacking ideas, so white has to defend rather than go for active counterplay. This is a losing battle for white.
|Position after 38. Nc4+|
19... Bxd2 20. Qd4 Bb4 21. g3 Ra5 22. a4 h5 23. Kg2 Be1 24. Kg1 Rg5 25. Ng2 Bb4
Threatening Bc5 pinning the queen.
26. Nde3 Kg8 27. Qa1 Bd7 28. Qf1 Bc5 29. Qxf7+ Kxf7 30. Kf2 c6 31. Bd1 Kf6 32. Kf1 Bh3 33. Ke1 h4 34. g4 Ke5 35. Kd2 d5 36. cxd5 cxd5 37. Ke2 d4 38. Nc4+ 1-0. (diagram)
The game was adjudicated as black win by the TCEC win rule. The two connected passers of black cannot be stopped without piece sacrifices. Example continuation: 38... Kf6 39. Nf4 Bxg4+ 40. Kd2 Bxd1 41. Kxd1 Rg1+ 42. Ke2 Rh1 43. Kd2 Rxh2+ 44. Kc1 Kf5. White cannot stop the connected d/e passers and black has now also the g/h passers. 45. Nh5 d3 46. Nxg7+ Kf6 47. Nh5+ Kg5 48. Ng7 Rc2+ 49. Kb1 h3 50. Ne6+ Kh4 51. Nxc5 h2 52. Nb2 h1=Q+ 53. Ka2 b6 54. Nd7 Qc1 55. Ka3 Qxb2+ 56. Kb4 Qc3+ 57. Ka3 b5 58. axb5 Qa5#