TCEC Season 16 Division P Game 22 – Leela-Komodo MCTS

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Game Season 16, Division P, Game 22
Result 1-0
ECO D11
Links TCEC archive
Lichess



Game overview

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Position after 12. g3


1. c4 c6 2. Nf3 Nf6 3. d4 d5 4. e3 a6 5. Bd3 Bg4 6. Nbd2 Nbd7 7. Qc2 e6 8. b3 Bd6

End of book moves.

9. O-O Bh5 10. Bb2 Qc7 11. c5 Be7 12. g3 (diagram)

The g-pawn makes room for later Kg2, enabling a rook to support the potential h-push. This move was a novelty in the Lichess masters database.[1]


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Position after 34. Ndf3


12... a5 13. a3 O-O 14. b4 Bg6 15. Bxg6 hxg6 16. Bc3 axb4 17. axb4 Rfb8 18. Kg2 Ne8 19. Rab1 Qc8 20. h4 Nc7 21. Rh1 Nb5 22. Rbe1 Na3 23. Qc1 Nb5 24. e4

While threatening to close the center, 24. e4 also creates a kingside entry square f4 for the queen.

24... Qf8 25. Qc2 Na3 26. Qd3 Nb5 27. Bb2 Nc7 28. Bc1 b6 29. e5 Na6 30. Ba3 Nc7 31. Bc1 Ra4 32. Ng5 bxc5 33. bxc5 Rbb4 34. Ndf3 (diagram)

Black has to play 34... Bxg5 to take the knight with the bishop. To illustrate the threat: 34... Nb5 35. h5 Nxd4? 36. hxg6 and black has to give up the queen with, e.g., 36... Nf5 37. gxf7+ Qxf7 38. Nxf7. Note that 35... Rxd4 giving up the exchange was better, but white would still have kept the attack being exchange up.

Now white uses the opportunity to open up the h-file.


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Position after 39. Qf6+


34... Bxg5 35. hxg5 35... Qa8 36. Qe3 Qa6 37. Qf4

The queen is now committing to the attack. Computer analysis shows that black has no good defense against white's threats. Black's pieces are simply too far away to defend in time.

37... Kf8 38. Rh8+ Ke7 39. Qf6+ (diagram)

The highlight move of the game, temporarily sacrificing the queen. White now forces a sequence winning the queen back with interest.

Nxf6 40. exf6+ gxf6 41. gxf6+ Kxf6 42. Bg5+ Kg7 43. Reh1 Qf1+ 44. Rxf1 Ra8 45. Rxa8 Nxa8

After the forced sequence, white is up a piece for a pawn. The rest is simple technique for the engines of this caliber.

46. Ra1 Nc7 47. Be3 Rb7 48. g4 g5 49. Bxg5 f6 50. Be3 Nb5 51. g5 fxg5 52. Bxg5 e5 53. dxe5 Nc7 54. Bf6+ Kg6 55. Nd4 Rb4 56. Nxc6 Rc4 57. Ne7+ Kf7 58. Ra7 Ne6 59. c6 d4 60. Nf5+ Kg6 61. Nh4+ Kh6 1-0

The game was adjudicated as white win.

Remarks

As user Occyroexanthub notes, in the history of TCEC top divisions before this game, only 2 other times a successful queen sacrifice has been made where the sacrificing side will not get material immediately back.[2] Those games are:


Analysis

Kingscrusher's analysis of the game


ChessNetwork's analysis of the game


References

  1. https://lichess.org/H0yWSwXZ#22
  2. TCEC official discord, #notable-games channel, 2019-09-06