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Up Topic The Rybka Lounge / Computer Chess / An amazing Q sac. (& declined!?) from lightning TC game
- By MrKris (***) Date 2021-03-27 01:45
In the original game, at the bottom with the conditions, white declined black's Q offer with 26.Bx(B)c4.
There both the engines said 0.00 for several moves but black seemed to play the ending better to win.

Analysis by Stockfish_21032417_x64 if white had accepted the Q 26.Nx(Q)g7:
(Evaluation, time in mm:ss, depth/sel. depth.)
[White "Stockfish analysis"]
[Black "Oki-Maguro-13_x64"]
[Result ""]
[FEN "1rr3k1/4p1qp/3pNb1n/2pPnp1P/2b3p1/1PB1P3/2Q1BPP1/2KR3R w - - 0 26"]

26. Nxg7 Bxb3 27. Nxf5 {! The only move, maybe a very slight =+.}  (27. Ne6 {?} 27. .. Bxc2 {+(good for black)1.56 ,
02:41 36/49} 28. Kxc2 Kf7 29. Ra1 Nd7 30. f3 Bxc3 31. Kxc3 Rb4 {ect., black
is a pawn up.}) (27. Qd2 {?? saving the Q loses:} Kxg7 28. e4 (28. f4 28.
.. gxf3 {+(black is winning)4.78 , 01:00} 29. Ba6 Rc7 30. gxf3 c4 31. Rdg1+
Kh8 32. Qg2 Ra7 33. Kd2 Rxa6 34. Ra1 Ba2 35. Qg3 Ra3 36. Rhc1 Nhf7 {ect.,
black has a strong attack and 3 minors + pawn vs. white's Q.}) (28. Ba6 28.
.. Rc7 {+(black is winning)4.63 , 01:44 34/54}) (28. Qe1 28. .. Ra8
{+(black is winning)5.17:} 29. f4 gxf3 30. gxf3 c4 31. Rd4 Kf7 32. Rh2 Ra2
33. Rf2 Rca8 34. Bd1 Ra1+ 35. Bxa1 Rxa1+ 36. Kd2 Nd7 37. Bxb3 Rxe1 38. Rxc4
Ra1 {ect., black has 2 N's vs. white's R.}) (28. Rdg1 {saving the exchange
is worse:} c4 {+(black has won)7.81 , 01:11 34/55} 29. e4 Nd3+ 30. Bxd3
cxd3 31. Qg5+ Kh8 32. Qxf6+ (32. Qxh6 {?? Q vs. B but it is Mate in 6:}
Bxc3 33. Qg7+ Kxg7 34. Rh4 Ba5+ 35. Kb2 Rc2+ 36. Kb1 Bc4+ 37. Ka1 Bc3#) 32.
.. exf6 33. Kd2 fxe4 {ect., balck is a N up.}) 28. .. c4 {+(black is
winning)4.55 , 01:09 35/66} 29. Qe3 f4 30. Qxf4 Bxd1 31. Rxd1 Rb3 32. Ba1
Ra3 33. Bd4 c3 34. Qe3 Rb8 35. f4 gxf3 36. gxf3 Nhf7 37. Bxc3 Rc8 38. Kd2
Rcxc3 39. Qxc3 Rxc3 40. Kxc3 Nxf3+ 41. Kc2 Nd4+ 42. Kd3) 27. .. Bxc2 28.
Nxh6+ Kg7 29. Kxc2 Kxh6 30. Ra1 {-0.12 =+ , 02:28 40/53} *

Both said 0.00 about the declined 26.Bx(B)c4:
[Event "G/90''+1'' 1GB Sy.6"]
[Site "AMD PhII X6 6CPU"]
[Date "2021.03.24"]
[Round "13"]
[White "ShashChess-16_x64"]
[Black "Oki-Maguro-13_x64"]
[Result "0-1"]
[ECO "A40"]
[Opening "Queen's Pawn"]
[Variation "Modern, 1.d4 g6 2.c4"]
[TimeControl "90+1"]
[Termination "adjudication"]
[PlyCount "121"]
[WhiteType "human"]
[BlackType "human"]

1. d4 {book} g6 {book} 2. c4 {book} c5 {book} 3. d5 {book} f5 {book} 4. h4
{book} Bg7 {book} 5. h5 {+1.25/22 3.1s} d6 {-0.66/21 3.1s} 6. Nh3 {+1.27/20
1.5s} Nd7 {-0.57/22 5.3s} 7. Nf4 {+1.31/21 1.4s} Ne5 {-0.64/20 3.3s} 8. Nc3
{+0.97/22 4.2s} Bd7 {-0.58/20 2.6s} 9. e3 {+0.76/22 6.6s} Qc8 {-0.43/21
1.6s} 10. Bd2 {+0.73/24 8.3s} Bf6 {-0.40/21 1.8s} 11. Qc2 {+0.63/24 2.0s}
g5 {-0.25/24 3.4s} 12. Nh3 {+0.56/24 2.5s} g4 {-0.29/26 7.4s} 13. Nf4
{+0.75/24 2.3s} Nh6 {-0.28/23 1.2s} 14. a4 {+0.77/24 3.7s} b6 {-0.32/24
5.0s} 15. b3 {+0.92/22 1.2s} a6 {-0.30/23 5.7s} 16. Bc1 {+0.52/29 4.6s} O-O
{-0.22/23 1.1s} 17. Bb2 {+0.50/28 1.7s} Qe8 {-0.22/22 2.0s} 18. O-O-O
{+0.45/24 1.5s} Rb8 {-0.21/22 2.9s} 19. Be2 {+0.52/24 7.0s} Qf7 {-0.15/22
2.5s} 20. Rdf1 {+0.34/25 6.5s} Rfc8 {-0.10/20 1.6s} 21. Rd1 {+0.30/23 1.1s}
b5 {0.00/24 2.8s} 22. axb5 {0.00/28 3.0s} axb5 {0.00/23 1.7s} 23. Nxb5
{0.00/27 1.7s} Qg7 {0.00/24 1.7s} 24. Bc3 {0.00/27 2.3s} Bxb5 {0.00/26
1.6s} 25. Ne6 {0.00/29 1.9s} Bxc4 {0.00/28 1.6s} 26. Bxc4 {0.00/30 1.4s}
Qh8 {0.00/29 2.4s} 27. Ba6 {0.00/31 1.6s} Re8 {0.00/31 2.6s} 28. f4
{0.00/29 1.9s} Nd7 {+0.17/24 2.0s} 29. Be1 {0.00/28 1.5s} Kf7 {+0.25/28
7.7s} 30. Kd2 {0.00/26 1.5s} Ra8 {+0.06/24 2.0s} 31. Bb5 {0.00/25 2.1s} Ra7
{+0.08/27 2.0s} 32. Ng5+ {-0.21/25 5.2s} Kg8 {+0.17/27 6.0s} 33. Bc6
{-0.11/25 1.4s} Rc8 {+0.26/26 7.2s} 34. Ke2 {-0.15/25 2.7s} Nf8 {+0.27/24
1.3s} 35. Ba4 {0.00/26 1.5s} Qg7 {+0.34/22 1.9s} 36. Bh4 {0.00/27 1.5s} Kh8
{+0.34/24 3.8s} 37. g3 {0.00/27 1.7s} Rb8 {+0.43/23 2.5s} 38. Rb1 {-0.43/25
4.2s} Raa8 {+0.60/26 6.7s} 39. Rhc1 {-0.95/28 14s} Rb4 {+0.65/24 2.0s} 40.
Bc6 {-0.74/26 2.9s} Rab8 {+0.67/24 1.8s} 41. Qd3 {-0.46/26 1.0s} Ng8
{+0.81/24 1.3s} 42. Qxf5 {-1.39/28 13s} h6 {+0.76/22 2.0s} 43. Ne6
{-1.15/22 0.29s} Nxe6 {+0.81/22 1.9s} 44. dxe6 {-1.16/21 0.59s} Bxh4
{+0.93/22 1.0s} 45. gxh4 {-1.38/25 2.8s} Nf6 {+0.89/21 1.7s} 46. Rc3
{-1.25/21 2.9s} d5 {+0.90/23 3.2s} 47. Rcc1 {-1.32/18 0.61s} Rd8 {+1.08/18
0.81s} 48. Kf1 {-1.13/16 0.21s} g3 {+1.22/19 0.98s} 49. Qg6 {-1.25/18
0.27s} Re4 {+1.29/19 1.2s} 50. Rxc5 {-1.22/17 0.40s} Rxe3 {+1.31/18 1.0s}
51. Rd1 {-2.44/20 3.4s} Nxh5 {+2.18/22 0.93s} 52. Qxg7+ {-3.59/18 0.65s}
Kxg7 {+2.26/23 0.94s} 53. Rcxd5 {-2.63/20 0.22s} Rxd5 {+2.48/23 1.4s} 54.
Bxd5 {-3.97/23 2.0s} Kf6 {+2.61/22 0.98s} 55. Rd4 {-4.01/20 0.71s} Kf5
{+2.67/23 1.2s} 56. b4 {-3.86/21 0.20s} Nxf4 {+2.76/21 0.94s} 57. b5
{-5.12/23 2.5s} Re5 {+2.81/22 1.1s} 58. Bc6 {-5.28/20 0.52s} Rc5 {+2.85/21
1.1s} 59. Rd1 {-5.33/22 1.6s} Rc2 {+2.89/20 1.1s} 60. Kg1 {-5.89/21 1.1s}
Rf2 {+4.10/22 0.95s} 61. Kh1 {-6.71/19 0.59s, Black wins by adjudication} 0-1
Up Topic The Rybka Lounge / Computer Chess / An amazing Q sac. (& declined!?) from lightning TC game

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