Some Mysterious Bug in Stockfish

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abgursu
Posts: 92
Joined: Thu May 14, 2020 3:34 pm
Full name: A. B. Gursu

Some Mysterious Bug in Stockfish

Post by abgursu »

[fen]6bk/3q2p1/2p1p2p/2PpP2P/pp1PpPB1/4P2Q/PP6/4K3 b - - 0 36 [/fen]

This is from a local game between Blue Marlin and Eman, played on my computer. On move 36, Blue Marlin had an easy win after black's move Qa7, by simply taking the e6 pawn. I then analyzed and somehow even with the learning Eman does make the same mistake in a certain depth. I then analyzed this very position with Stockfish, Crystal and Dragon, and the result was the same; none of those engines suggested Bxe6 against the move Qa7. There are Qa7 Kf2's Qa7 Qh1's and Qa7 Qh4's but no Bxe6's except Blue Marlin who played it easily. I understand that that was a long win, but shouldn't engines at least consider Bxe6?

The Game:
[pgn][Event "Dutch Wide Fast, Blitz 5m+3s"]
[Site "?"]
[Date "2023.05.09"]
[Round "60.1"]
[White "Blue Marlin 15.7-bmi2"]
[Black "EMAN 8.91 64-bit BMI2"]
[Result "1-0"]
[ECO "A90"]
[Annotator "0.47;0.52"]
[PlyCount "141"]
[EventDate "2023.04.23"]
[EventType "simul"]
[SourceTitle "Fritz Engine Tournament"]
[Source "Light"]

{Intel(R) Core(TM) i5-1035G1 CPU @ 1.00GHz 1190 MHz W=49.7 plies; 2.640kN/s; 6.885 TBAs B=49.9 plies; 2.393kN/s; 362.207 TBAs} 1. d4 f5 2. c4 Nf6 3. g3 e6 4. Bg2 Bb4+ 5. Bd2 Be7 6. Nf3 {0.47/33 33} O-O {0.52/34 61} 7. O-O {0.60/32 15} d5 {0.50/34 42} 8. Qc2 {0.48/32 27} c6 {0.41/28 7} 9. Nc3 {0.54/27 5 (b4)} Ne4 {0.43/27 6 (h6)} 10. Bf4 {0.63/29 9} Nd7 {0.42/26 6 (g5)} 11. Rad1 {0.52/30 7} a5 {0.51/30 29 (g5)} 12. Nxe4 {0.55/35 29 (a4)} fxe4 {0.36/31 9} 13. Ne5 {0.49/31 4} Bg5 {0.39/28 11 (Nxe5)} 14. Bxg5 {0.50/33 14 (Nxd7)} Qxg5 {0.42/27 4} 15. f4 {0.61/32 10} Qe7 {0.52/32 12} 16. h4 {0.69/31 5} Nxe5 {0.31/27 5} 17. fxe5 {0.66/33 6} Rxf1+ {0.31/30 20 (Bd7)} 18. Rxf1 {0.61/32 7} Bd7 {0.37/32 5} 19. c5 {0.66/32 6} Rb8 {0.35/31 7} 20. Bh3 {0.56/30 9} b6 {0.30/29 5 (h5)} 21. Qb3 {0.44/36 17 (cxb6)} b5 {0.37/34 7} 22. Qc3 {0.48/40 9 (Qe3)} Ra8 {0.38/35 4 (a4)} 23. Bg4 {0.44/36 9} h6 {0.41/34 14 (Be8)} 24. Qe1 {0.44/37 7 (e3)} Be8 {0.42/35 4} 25. Rf4 {0.38/41 20} Bg6 {0.38/34 4 (Bf7)} 26. h5 {0.44/34 4} Bf7 {0.38/35 5} 27. Qf2 {0.41/34 7 (e3)} a4 {0.38/36 5} 28. Kf1 {0.34/50 28 (e3)} Qe8 {0.34/37 5 (Ra7)} 29. Qh2 {0.38/34 4} Ra7 {0.34/34 5 (Kh8)} 30. Qh3 {0.32/35 9 (Ke1)} Kh8 {0.32/37 6} 31. e3 {0.31/40 28 (Kf2)} Bg8 {0.27/37 10 (Qe7)} 32. Qh4 {0.31/39 3 (Kg1)} Rf7 {0.26/43 7 (Rd7)} 33. Ke2 {0.31/38 5 (Kg2)} b4 {0.20/35 5 (Rf8)} 34. Ke1 {0.36/33 19} Rxf4 {0.05/32 16} 35. gxf4 {0.35/40 3} Qd7 {0.03/31 3 (a3)} 36. Qh3 {0.56/28 4 (Kd1)} Qa7 {0.03/42 5 (Qd8)} 37. Bxe6 {2.16/23 6 (Be2)} Qa5 {1.39/32 55} 38. Ke2 {2.43/24 6} Bxe6 {2.16/28 16 (Qa6+)} 39. Qxe6 {3.01/27 6} Qa6+ {2.18/23 1} 40. Kf2 {3.27/27 7} Qd3 {2.18/25 7} 41. Qxc6 {3.54/27 7} a3 {2.30/23 6 (b3)} 42. Qe8+ {7.64/27 13 (b3)} Kh7 {2.35/21 2} 43. Qg6+ {7.81/26 3} Kg8 {1.42/19 2} 44. b3 {8.40/29 12 (bxa3)} Qd1 {2.86/25 6} 45. Kg3 {8.45/31 2} Qg1+ {3.04/25 5 (Qf3+)} 46. Kh4 {8.88/26 3} Qxe3 {3.29/23 3} 47. Kg4 {9.01/28 8} Qd3 {2.92/22 1 (Qf3+)} 48. e6 {10.51/23 3 (Kf5)} Qf3+ {6.00/25 5} 49. Kf5 {11.34/22 2} e3 {6.11/34 1} 50. Ke5 {11.72/26 6} e2 {6.11/31 1} 51. Qf7+ {12.78/24 4} Kh7 {6.17/28 5} 52. e7 {13.25/23 2 (Kd6)} e1=Q+ {7.13/25 3} 53. Kd6 {13.60/20 2} Qfe4 {4.64/29 5} 54. c6 {14.17/21 2 (Kd7)} Q1e2 {5.39/20 2 (Q1e3)} 55. c7 {14.73/23 4 (Kd7)} Q2e3 {8.18/22 4 (Qb5)} 56. c8=Q {#17/39 2} Q4xf4+ {25.38/24 3} 57. Qxf4 {#16/39 2} Qxf4+ {#18/42 2} 58. Kd7 {#14/39 2} Qf5+ {#17/35 1} 59. Kc7 {#13/46 2 (Kd8)} Qf4+ {#12/39 3} 60. Kb7 {#12/51 3} Qf7 {#11/44 1} 61. Qf8 {#11/56 2} Qxh5 {#10/43 1} 62. e8=Q {#10/63 3} Qxe8 {#9/47 2} 63. Qxe8 {#9/69 3} h5 {#8/44 2 (g5)} 64. Qxh5+ {#8/52 3} Kg8 {#7/57 1} 65. Kc6 {#7/77 3 (Qg6)} g6 {#6/126 2} 66. Qxg6+ {#6/150 3} Kh8 {#5/245 1} 67. Qg5 {#5/245 1} Kh7 {#4/245 0} 68. Kd7 {#4/245 0} Kh8 {#3/245 0} 69. Ke6 {#3/245 0} Kh7 {#2/245 0} 70. Kf7 {#2/245 0 (Kf6)} Kh8 {#1/245 0} 71. Qh4# {#1/245 0} 1-0

[/pgn]
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chessica
Posts: 994
Joined: Thu Aug 11, 2022 11:30 pm
Full name: Esmeralda Pinto

Re: Some Mysterious Bug in Stockfish

Post by chessica »

Code: Select all

FEN: 6bk/q5p1/2p1B2p/2PpP2P/pp1PpP2/4P2Q/PP6/4K3 b - - 0 37

Stockfish-windows-2022-x86-64:
 8/9	00:00	 18k	891k	+0,94	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6xf1+ Ke1xf1 Kg8f8 Kf1g2
 8/7	00:00	 18k	891k	+0,17	Lg8xe6 Dh3xe6 Da7a6 De6g4 Da6d3 Ke1f2 Dd3c2+ Kf2g3
 8/12	00:00	 18k	891k	+0,12	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 De6g4 Da6d3 Ke1f2 Dd3b1 Dg4c8+ Kh8h7 Dc8f5+ Kh7h8
 8/14	00:00	 18k	891k	 0,00	Da7a5 Ke1f1 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1+ Kf1f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 e5e6
 8/9	00:00	 18k	891k	 0,00	b4b3 a2a3 Da7a5+ Ke1e2 Da5b5+ Ke2f2 Lg8xe6 Dh3xe6 Db5d3
---------------------------------------------------------------------------
 9/12	00:00	 32k	983k	+1,03	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6xf1+ Ke1xf1 Kg8f8 Kf1g2
 9/10	00:00	 32k	983k	+0,17	Lg8xe6 Dh3xe6 Da7a6 De6g4 Da6c4 Ke1f2 Dc4c2+ Dg4e2 b4b3 a2xb3
 9/13	00:00	 32k	983k	+0,12	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 De6g4 Da6d3 Ke1f2 Dd3b1 Dg4c8+ Kh8h7 Dc8f5+ Kh7h8
 9/16	00:00	 32k	983k	 0,00	Da7a5 Ke1f1 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1+ Kf1f2 Kh8xg8 Dh3e6+ Kg8h7 De6g6+ Kh7h8 e5e6 Da1d1
 9/12	00:00	 32k	983k	 0,00	b4b3 a2a3 Da7a5+ Ke1e2 Da5b5+ Ke2f2 Lg8xe6 Dh3xe6 Db5d3 De6e8+ Kh8h7 De8g6+ Kh7h8
---------------------------------------------------------------------------
 10/14	00:00	 59k	813k	+1,02	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6c8 f4f5 Dc8d8 f5f6 g7xf6 Df1f5 f6xe5 Df5g6+ Kg8h8 Dg6xh6+ Kh8g8 Dh6xc6
 10/19	00:00	 59k	813k	+0,13	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Dd3d2+ Dg4e2 Dd2b2 Kf2f1 Kh7g8 f4f5 Kg8f7 De2f2 Db2b1+ Kf1g2 Db1d1
 10/17	00:00	 59k	813k	+0,11	Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6xc6 Dd3d2+ Kf2g3 Dd2xe3+ Kg3g4 De3f3+ Kg4f5
 10/19	00:00	 59k	813k	+0,11	Da7a5 Ke1e2 Da5a6+ Ke2f2 Da6d3 Le6xg8 Kh8xg8 Dh3e6+ Kg8h8 De6xc6
 10/12	00:00	 59k	813k	 0,00	b4b3 a2a3 Da7a5+ Ke1e2 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5d3 De6e8+ Kh8h7 De8g6+ Kh7h8
---------------------------------------------------------------------------
 11/18	00:00	 120k	779k	+0,99	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6c8 f4f5 Dc8d8 Df1f4 b4b3 a2xb3 Dd8a5+ Ke1f2 Da5d2+ Kf2g3
 11/15	00:00	 120k	779k	+0,28	Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6g4 Dd3b1 Dg4c8+ Kh8h7 Dc8xc6 Db1xb2+ Kf2g3 Db2e2 Dc6g6+ Kh7g8
 11/21	00:00	 120k	779k	+0,19	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Dd3d2+ Dg4e2 Dd2b2 Kf2f1 Kh7g8 f4f5 Kg8f7 De2f2 Db2b1+ Kf1g2 Db1d1
 11/17	00:00	 120k	779k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8
 11/14	00:00	 120k	779k	 0,00	b4b3 a2a3 Da7a5+ Ke1e2 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5d3 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6
---------------------------------------------------------------------------
 12/21	00:00	 236k	795k	+1,09	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6c8 f4f5 Dc8d8 Df1f4 Dd8a5 Ke1f2 a4a3 b2b3 Da5a6
 12/25	00:00	 236k	795k	+0,21	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Kh7g8 Dg4e2 Dd3b1 Kf2g2 Db1b2 De2f2 Db2c1 Kg2g3 Dc1d1 Kg3h4 Kg8f7 f4f5 Dd1h1+ Kh4g3
 12/21	00:00	 236k	795k	+0,21	Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6g4 Dd3c2+ Dg4e2 Dc2b1 Kf2g3 Db1xa2 e5e6 Kh8g8 De2a6 Da2b3 Da6c8+ Kg8h7
 12/16	00:00	 236k	795k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8
 12/12	00:00	 236k	795k	 0,00	b4b3 a2a3 Da7a5+ Ke1e2 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5d3 De6e8+ Kh8h7 De8g6+ Kh7h8
---------------------------------------------------------------------------
 13/21	00:00	 365k	814k	+1,14	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1d1 Da5a8 Kd1c2 a4a3 b2b3 Da8e8 Df1h3 De8a8
 13/27	00:00	 365k	814k	+0,21	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Dd3d2+ Dg4e2 Dd2b2 Kf2f1 Kh7g8 f4f5 Kg8f7 De2f2
 13/14	00:00	 365k	814k	+0,12	Lg8xe6 Dh3xe6 b4b3 a2xb3 a4xb3 Ke1f2 Da7a1 De6e8+ Kh8h7 De8g6+ Kh7h8 Kf2g3 Da1g1+ Kg3h4
 13/20	00:00	 365k	814k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 Dg6xc6 Da1xb2+ Kf2g3 Db2d2 Dc6c8+ Kh8h7
 13/14	00:00	 365k	814k	 0,00	b4b3 a2a3 Da7a5+ Ke1e2 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5d3 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6
---------------------------------------------------------------------------
 14/19	00:00	 467k	826k	+0,67	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1d1 Da5d8 Df1h3 Dd8a8 Dh3e6+ Kg8h8 De6g4
 14/26	00:00	 467k	826k	+0,27	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Kh7g8 Dg4e2 Dd3b1 Kf2g2 Db1b2 De2f2 Db2c1 Kg2g3 Dc1d1 Kg3h4 Kg8f8 Df2h2 Dd1e1+ Dh2g3
 14/16	00:00	 467k	826k	 0,00	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8
 14/20	00:00	 467k	826k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6 Da1d1 Dg6e8+ Kh8h7 Kf2g3
 14/24	00:00	 467k	826k	 0,00	b4b3 a2a3 Da7a5+ Ke1e2 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5d3 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6 Dd3d2+ Kf2g3 Dd2xe3+ Kg3g4 De3f3+ Kg4f5 e4e3 Dg6e8+ Kh8h7 e6e7
---------------------------------------------------------------------------
 15/21	00:00	 609k	837k	+0,50	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1d1 Da5d8 Df1f2 a4a3 b2b3 Dd8e8
 15/27	00:00	 609k	837k	+0,24	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Kh7g8 Dg4e2 Dd3b1 Kf2g2 Db1b2 De2f2 Db2b1 Kg2g3 Db1d1 Kg3h4 Kg8f8 Df2g3 Dd1b1 e5e6
 15/22	00:00	 609k	837k	 0,00	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8 a2xb3 a4xb3 Ke1f2 Da7a1 e5e6 Da1d1 Dg6e8+ Kh8h7 Kf2g3 Dd1g1+ Kg3h4 Dg1xe3 Kh4g4 De3f3+ Kg4f5
 15/22	00:00	 609k	837k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8
 15/20	00:00	 609k	837k	 0,00	b4b3 a2a3 Da7a5+ Ke1e2 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5d3 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6 Dd3d2+ Kf2g3 Dd2xe3+ Kg3g4 De3f3+ Kg4f5
---------------------------------------------------------------------------
 16/27	00:01	 1.329k	849k	+1,07	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1e2 Kg8f8 Df1h3 Da5a6+ Ke2f2 Da6d3 Dh3c8+ Kf8e7 Dc8c7+ Ke7f8 Dc7d8+ Kf8f7 e5e6+ Kf7xe6 Dd8e8+ Ke6f6 De8f8+ Kf6e6
 16/24	00:01	 1.329k	849k	+0,44	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Kh7g8 Dg4e2 Dd3b1 Kf2g2 Db1b2 De2f2 Db2b1 Kg2g3 Db1d1 Kg3h4
 16/24	00:01	 1.329k	849k	 0,00	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8
 16/25	00:01	 1.329k	849k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6 Da1d1 Dg6e8+ Kh8h7 Kf2g3 Dd1g1+ Kg3h4 Dg1xe3 Kh4g4 De3f3+ Kg4f5
 16/14	00:01	 1.329k	849k	 0,00	b4b3 a2a3 Da7a5+ Ke1e2 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5a5 De6c8+ Kh8h7 Dc8f5+ Kh7h8
---------------------------------------------------------------------------
 17/25	00:02	 1.775k	859k	+1,06	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1e2 b4b3 a2a3 Da5d8 Ke2d2 Dd8h4 Df1e2 Dh4d8 e5e6 Dd8a5+ Kd2d1 Da5a8 f4f5 Da8b8 Kd1d2
 17/33	00:02	 1.775k	859k	+0,39	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Kh7g8 Dg4e2 Dd3b1 Kf2g2 Db1b2 De2f2 Db2b1 Kg2h3 Db1h1+ Kh3g4 Kg8f7 f4f5 Dh1d1+ Kg4g3 Dd1h1 f5f6 Dh1xh5 f6xg7+ Kf7xg7
 17/21	00:02	 1.775k	859k	 0,00	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8
 17/24	00:02	 1.775k	859k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8
 17/29	00:02	 1.775k	859k	 0,00	b4b3 a2a3 Da7a5+ Ke1e2 Lg8xe6 Dh3xe6 Da5a6+ Ke2f2 Da6d3 De6e8+ Kh8h7 De8g6+ Kh7h8 Dg6e8+
---------------------------------------------------------------------------
 18/36	00:02	 2.488k	864k	+1,20	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1e2 Kg8h7 e5e6 Kh7g8 f4f5 Da5a7 Ke2d2 Da7b8 e6e7 Kg8f7 Df1g2
 18/37	00:02	 2.488k	864k	+0,41	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Kh7g8 Dg4e2 Dd3b1 Kf2g2 Db1b2 De2f2 Db2b1 Kg2h3 Db1h1+ Kh3g4 Kg8f7 f4f5 Dh1d1+ Kg4g3 Dd1h1 f5f6 Dh1xh5 f6xg7+ Kf7xg7
 18/32	00:02	 2.488k	864k	 0,00	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8 a2xb3 a4xb3 Ke1f2 Da7a1 e5e6 Da1d1 Dg6e8+ Kh8h7 Kf2g3 Dd1f3+ Kg3h4 Df3xe3 De8g6+ Kh7h8 Dg6f7 De3f2+ Kh4g4 Df2f3+ Kg4f5 e4e3 Df7e8+ Kh8h7 De8g6+ Kh7h8 Kf5e5
 18/35	00:02	 2.488k	864k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6 Da1d1 Dg6e8+ Kh8h7 Kf2g3 Dd1f3+ Kg3h4 Df3xe3 De8g6+ Kh7h8 Dg6f7 De3f2+ Kh4g4 Df2f3+ Kg4f5
 18/24	00:02	 2.488k	864k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6 Da1d1 Dg6e8+ Kh8h7 Kf2g3 Dd1g1+ Kg3h4 Dg1xe3 De8g6+ Kh7h8 Dg6f7
---------------------------------------------------------------------------
 19/27	00:03	 2.874k	869k	+1,23	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1e2 b4b3 a2a3 Da5d8 Ke2d2 Dd8h4 Df1e2 Dh4h1 e5e6 Dh1h3 Kd2c3 Dh3xe6 Kc3b4 De6h3 Kb4xa4 Dh3f3 De2e1 Df3xh5 Ka4xb3 Dh5g4 a3a4 h6h5 a4a5
 19/32	00:03	 2.874k	869k	+0,42	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Kh7g8 Dg4e2 Dd3b1 Kf2g2 Db1b2 De2f2 Db2b1 Kg2h3 Db1d1 Kh3h4 Kg8f7 f4f5 Dd1b1 Kh4g4 Db1d1+ Kg4g3 Dd1h1
 19/26	00:03	 2.874k	869k	 0,00	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8
 19/28	00:03	 2.874k	869k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6 Da1d1 Dg6e8+ Kh8h7 Kf2g3 Dd1f3+ Kg3h4 Df3xe3 De8g6+ Kh7h8 Kh4g4 De3f3+ Kg4f5
 19/28	00:03	 2.874k	869k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8
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 20/37	00:03	 3.501k	879k	+0,61	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1e2 Da5d8 Df1h3 b4b3 a2xb3 Dd8b8 Ke2f2 Db8xb3 Dh3e6+ Kg8h7 De6xc6 Db3xb2+ Kf2g3 Db2e2 Dc6g6+ Kh7g8
 20/35	00:03	 3.501k	879k	+0,35	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6c8+ Kh8h7 Dc8g4 Kh7g8 Dg4e2 Dd3b1 Kf2g2 Db1b2 De2f2 Db2a1 Kg2h3 Da1d1 Kh3h4 Kg8f8 Df2g3 Kf8g8 Dg3h3 Dd1d2 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6 Dd2h2+ Kh4g4
 20/30	00:03	 3.501k	879k	 0,00	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8 a2xb3 a4xb3 Ke1f2 Da7a1 Dg6e8+ Kh8h7 e5e6 Da1d1 Kf2g3 Dd1f3+ Kg3h4 Df3xe3 De8f7 De3f2+ Kh4g4 Df2f3+ Kg4f5 e4e3 Kf5e5 Df3e4+ Ke5d6 e3e2
 20/30	00:03	 3.501k	879k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 e5e6 Da1d1 Kf2g3 Dd1f3+ Kg3h4 Df3xe3 De8f7 De3f2+ Kh4g4 Df2f3+ Kg4f5 e4e3 Kf5e5 Df3e4+ Ke5d6 e3e2
 20/32	00:03	 3.501k	879k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 e5e6 Da1d1 Kf2g3 Dd1f3+ Kg3h4 Df3xe3 Kh4g4 De3f3+ Kg4f5 e4e3 Kf5e5 Df3e4+ Ke5d6 e3e2
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 21/38	00:06	 5.540k	887k	+0,63	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6g4 Dd3c2+ Dg4e2 Dc2b1 Kf2g2 Db1b2 De2f2 Db2b1 Kg2g3 Db1d1 Kg3h4 Kh8g8 f4f5 Kg8f7 f5f6 Dd1h1+ Kh4g3 Dh1xh5 f6xg7+ Kf7xg7 Df2f6+ Kg7h7
 21/42	00:06	 5.540k	887k	+0,55	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1f2 b4b3 a2xb3 a4xb3 Kf2g3 Da5d2 Df1f2 Dd2d1 Kg3h4 Dd1c2 Df2g1 Dc2xb2 e5e6 Db2c2 e6e7 Kg8f7 Dg1g6+ Kf7xe7 Dg6xg7+ Ke7e8 Dg7xh6 b3b2 Dh6xc6+ Ke8e7 Dc6d6+ Ke7f7 Dd6xd5+ Kf7f6 Dd5d6+ Kf6f7
 21/28	00:06	 5.540k	887k	 0,00	Lg8xe6 Dh3xe6 b4b3 a2xb3 a4xb3 De6e8+ Kh8h7 De8g6+ Kh7h8
 21/30	00:06	 5.540k	887k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 a4xb3 Le6xg8 Da5a1 Ke2f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 e5e6 Da1d1 Kf2g3 Dd1f3+ Kg3h4 Df3xe3 De8f7 De3f2+ Kh4g4 e4e3 Df7g6+ Kh7g8 Dg6e8+ Kg8h7 Kg4f5 Df2f3 De8g6+ Kh7h8
 21/26	00:06	 5.540k	887k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 e5e6 Da1d1 Kf2g3 Dd1f3+ Kg3h4 Df3xe3 De8f7 De3f2+ Kh4g4 Df2f3+ Kg4f5 e4e3 Kf5e5 e3e2 Df7g6+ Kh7h8
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 22/42	00:07	 6.500k	894k	+0,68	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6g4 Dd3d2+ Dg4e2 Dd2c1 Kf2g2 Dc1b2 De2f2 Db2a1 Kg2h3 Da1d1 Kh3h4 Kh8g8 f4f5 Kg8f7 f5f6 Dd1h1+ Kh4g4 Dh1d1+ Kg4g3 Dd1xh5 f6xg7+ Kf7xg7 Df2f6+ Kg7h7 Df6e7+ Kh7g8 De7e6+ Kg8h8 De6g4 Dh5f7 Dg4f4 Df7g7+ Kg3h4 Dg7g6
 22/36	00:07	 6.500k	894k	+0,52	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1f2 b4b3 a2xb3 a4xb3 Kf2g3 Da5d2 Df1f2 Dd2d1 Kg3h4 Dd1c2 Df2g1 Dc2xb2 e5e6 Db2e2 e6e7 Kg8f7 Dg1g6+ Kf7xe7 Dg6xg7+ Ke7e8
 22/14	00:07	 6.500k	894k	 0,00	Lg8xe6 Dh3xe6 b4b3 a2xb3 a4xb3 De6e8+ Kh8h7 De8g6+ Kh7h8
 22/24	00:07	 6.500k	894k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5xb3 De6c8+ Kh8h7 Dc8f5+ Kh7h8
 22/34	00:07	 6.500k	894k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 Dg6e8+
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 23/52	00:09	 8.791k	901k	+0,69	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6g4 Dd3d2+ Dg4e2 Dd2c1 Kf2g2 Dc1b2 De2f2 Db2a1 Kg2g3 Da1d1 Kg3h4 Kh8g8 f4f5 Kg8f7 f5f6 Dd1h1+ Kh4g3 Dh1xh5 f6xg7+ Kf7xg7 Df2f4 Kg7g6 Df4g4+ Dh5g5 Dg4xg5+ Kg6xg5 Kg3h2 Kg5g6 Kh2g2 Kg6g5 Kg2g3 h6h5 Kg3g2 Kg5h6 Kg2h3 Kh6g7 Kh3h4 Kg7h6
 23/47	00:09	 8.791k	901k	+0,60	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1f2 b4b3 a2xb3 a4xb3 Kf2g3 Da5d2 Df1f2 Dd2d1 Kg3h4 Dd1c2 Df2g1 Dc2xb2 e5e6 Db2d2 e6e7 Kg8f7 Dg1g6+ Kf7xe7 Dg6xg7+ Ke7e8 Dg7xh6 b3b2 Dh6xc6+ Ke8f8 Dc6d6+ Kf8e8 Dd6e5+ Ke8f8 De5b8+ Kf8f7 Db8c7+ Kf7f8 Dc7d8+ Kf8f7 Dd8xd5+ Kf7f6
 23/28	00:09	 8.791k	901k	 0,00	Lg8xe6 Dh3xe6 b4b3 a2xb3 a4xb3 De6e8+ Kh8h7 De8g6+ Kh7h8
 23/24	00:09	 8.791k	901k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5xb3 De6c8+ Kh8h7 Dc8f5+ Kh7h8
 23/15	00:09	 8.791k	901k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 Dg6e8+
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 24/48	00:11	 10.565k	901k	+0,70	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 De6e8+ Kh8h7 De8g6+ Kh7h8 Ke1f2 Da6d3 Dg6g4 Dd3d2+ Dg4e2 Dd2c1 Kf2g2 Dc1b2 De2f2 Db2a1 Kg2g3 Da1d1 Kg3h4 Kh8g8 f4f5 Kg8f7 f5f6 Dd1h1+ Kh4g3 Dh1xh5 f6xg7+ Kf7xg7 Df2f4 Dh5g6+ Df4g4 Dg6g5 Kg3h3 Kg7g6 Dg4xg5+ Kg6xg5 Kh3g3 h6h5 Kg3g2 Kg5g6 Kg2h3
 24/43	00:11	 10.565k	901k	+0,64	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1e2 Da5d8 Df1h3 b4b3 a2a3 Dd8a8 Dh3e6+ Kg8h8 De6g4 Da8a6+ Ke2f2 Da6d3 e5e6 Kh8g8 Dg4g1 Dd3d2+ Kf2g3 Dd2xb2 Kg3h4 Db2d2 e6e7 Kg8f7 Dg1g6+ Kf7xe7 Dg6xg7+ Ke7e8 Dg7xh6 Dd2f2+ Kh4g5 Df2g3+ Kg5f5 Dg3h3+ Kf5e5 b3b2 Dh6xc6+ Dh3d7 Dc6b6 Dd7e7+ Ke5xd5
 24/28	00:11	 10.565k	901k	 0,00	Lg8xe6 Dh3xe6 b4b3 a2xb3 a4xb3 De6e8+ Kh8h7 De8g6+ Kh7h8 Ke1f2 Da7a1 e5e6 Da1d1 Kf2g3 Dd1f3+ Kg3h2 Df3e2+ Kh2h3 De2f3+ Kh3h2
 24/23	00:11	 10.565k	901k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5xb3 De6c8+ Kh8h7 Dc8f5+ Kh7h8
 24/32	00:11	 10.565k	901k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8
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 25/46	00:14	 12.717k	903k	+0,70	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6g4 Dd3d2+ Dg4e2 Dd2c1 Kf2g2 Dc1b2 De2f2 Db2a1 Kg2g3 Da1d1 Kg3h4 Kh8g8 f4f5 Kg8f7 f5f6 Dd1h1+ Kh4g3 Dh1xh5 f6xg7+ Kf7xg7 Df2f6+ Kg7h7 Df6f4 Kh7g6 Df4g4+ Dh5g5 Dg4xg5+ Kg6xg5 Kg3h2 Kg5h5 Kh2h3 Kh5g5 Kh3g3 h6h5 Kg3g2 Kg5g6
 25/52	00:14	 12.717k	903k	+0,42	Da7a6 Le6xg8 Kh8xg8 Dh3f1 Da6a5 Ke1e2 Da5d8 Df1h3 b4b3 a2a3 Dd8a8 Ke2f2 Da8a5 Kf2g3 Da5d2 Kg3g4 Dd2xb2 Kg4f5 Db2f2 Kf5e6 Df2f3 Dh3f5 b3b2 Df5f7+ Kg8h7 Df7b7 Df3e2 Ke6f7 De2xe3 f4f5 De3h3 Db7xb2 Dh3xf5+ Kf7e7
 25/24	00:14	 12.717k	903k	 0,00	Lg8xe6 Dh3xe6 b4b3 a2xb3 a4xb3 De6e8+ Kh8h7 De8g6+ Kh7h8
 25/32	00:14	 12.717k	903k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5xb3 De6c8+ Kh8h7 Dc8f5+ Kh7h8 Df5f8+ Kh8h7
 25/36	00:14	 12.717k	903k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 e5e6 Da1d1 e6e7 Dd1f3+ Kf2g1 Df3xe3+ Kg1g2 De3e2+ Kg2g3 De2f3+ Kg3h2 Df3e2+
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 26/46	00:21	 19.123k	874k	+1,04	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6g4 Dd3c2+ Dg4e2 Dc2b1 Kf2g2 Db1b2 De2f2 Db2c1 Kg2h3 Dc1d1 Kh3h4 Kh8g8 Df2g3 Dd1e2 e5e6 De2xa2 e6e7 Kg8f7 Dg3g6+ Kf7xe7 Dg6xg7+ Ke7e8 Dg7xh6 Da2h2+ Kh4g5 Dh2g3+ Kg5f5 Dg3h3+ Kf5e5 a3a2 Dh6xc6+ Dh3d7 Dc6a6 Dd7c7+ Ke5xd5 Dc7f7+ Kd5e5 Df7e7+ Ke5f5
 26/54	00:21	 19.123k	874k	+0,59	Da7a6 Le6g4 b4b3 a2xb3 a4xb3 f4f5 Da6a1+ Lg4d1 Da1xb2 f5f6 Db2c1 Dh3g4 Dc1xe3+ Ke1f1 g7xf6 e5xf6 De3g5 Dg4xg5 h6xg5 Ld1xb3 Lg8e6 Lb3a4 Le6d7 h5h6 Kh8g8 Kf1f2 Ld7e8 Kf2e3 Kg8h7
 26/30	00:21	 19.123k	874k	 0,00	Lg8xe6 Dh3xe6 b4b3 a2xb3 a4xb3 De6e8+ Kh8h7 De8g6+ Kh7h8 Ke1f2 Da7a1 e5e6 Da1d1 Kf2g3 Dd1f3+ Kg3h2 Df3e2+ Kh2h3 De2f3+ Kh3h2
 26/18	00:21	 19.123k	874k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5xb3 De6c8+ Kh8h7 Dc8f5+ Kh7h8
 26/35	00:21	 19.123k	874k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6c8+ Kh8h7 Dc8f5+ Kh7h8 Df5f8+ Kh8h7 e5e6 Da1d1 e6e7 Dd1f3+ Kf2g1 Df3g3+ Kg1f1 Dg3f3+ Kf1g1
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 27/45	01:24	 65.162k	769k	+3,29	Da7a6 Le6g4 Da6b5 Lg4e2 Db5a5 Ke1f2 Da5d8 Dh3g4 Lg8f7 f4f5 Lf7e8 Dg4f4 Kh8g8 Kf2g3 Dd8a5 f5f6 Da5c7 Le2g4 Dc7f7 Kg3h3 Kg8f8 Kh3g2 Kf8g8 Df4g3 Kg8f8 Lg4e6 Df7b7 Dg3g4 a4a3 b2xa3 b4xa3
 27/50	01:24	 65.162k	769k	+0,96	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6g4 Dd3c2+ Dg4e2 Dc2c1 Kf2g2 Dc1b2 De2f2 Db2c1 Kg2g3 Dc1d1 Kg3h4 Kh8g8 Df2g3 Dd1e2 e5e6 De2xa2 e6e7 Kg8f7 Dg3g6+ Kf7xe7 Dg6xg7+ Ke7e8 Dg7xh6 Da2h2+ Kh4g5 Dh2g3+ Kg5f5 Dg3h3+ Kf5e5 a3a2 Dh6xc6+ Dh3d7 Dc6a6 Dd7e7+ Ke5xd5 De7f7+ Kd5e5 Df7e7+ Ke5f5 De7f7+ Kf5g5 Df7g8+ Kg5h4
 27/21	01:24	 65.162k	769k	 0,00	Lg8xe6 Dh3xe6 b4b3 a2xb3 a4xb3 De6e8+ Kh8h7 De8g6+ Kh7h8 Ke1f2 Da7a1 e5e6 Da1d1 Kf2g3 Dd1f3+ Kg3h2 Df3e2+ Kh2h3 De2f3+ Kh3h2
 27/36	01:24	 65.162k	769k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5xb3 De6c8+ Kh8h7 Dc8f5+ Kh7h8 Df5f8+ Kh8h7 Df8f7 Db3xb2+ Kf2g3 Db2c1 Kg3g4 Dc1xe3 Df7g6+ Kh7h8 Dg6e8+ Kh8h7 De8g6+
 27/20	01:24	 65.162k	769k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6c8+ Kh8h7 Dc8f5+ Kh7h8 Df5f8+ Kh8h7
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 28/52	02:12	 101.361k	766k	+3,49	Da7a8 Le6xg8 b4b3 a2xb3 Kh8xg8 Ke1f2 Da8b8 b3xa4 Db8b3 Dh3e6+ Kg8h8 De6e8+ Kh8h7 De8g6+ Kh7h8 Dg6g1 Db3xa4 e5e6 Da4c2+ Kf2g3 Kh8g8 Kg3h4 Dc2e2 e6e7 Kg8f7 Dg1g6+ Kf7xe7 Dg6xg7+ Ke7d8 Dg7f6+ Kd8c7 Df6d6+ Kc7b7 Dd6d7+ Kb7a6 Dd7xc6+ Ka6a5 Dc6xd5 De2f3 c5c6+ Ka5b6
 28/45	02:12	 101.361k	766k	+1,44	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6g4 Dd3c2+ Dg4e2 Dc2b2 e5e6 Kh8g8 f4f5 Kg8f8 Kf2f1 Kf8g8 De2f2 Db2c1+ Kf1g2 Dc1d1 Kg2g3 Dd1xh5 Kg3f4 Dh5e8 Kf4g4 De8d8 Df2h4 Dd8f8 Dh4h5 Df8f6 Kg4g3 Df6f8 Kg3h3 Df8f6 Kh3g4 Df6e7 Dh5g6
 28/43	02:12	 101.361k	766k	+0,42	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8 a2a3 Da7a5+ Ke1e2 Da5b5+ Ke2f2 Db5d3 Dg6g1 Dd3c2+ Kf2g3 Dc2xb2 e5e6 Kh8g8 Kg3h4 Db2c2 f4f5 Dc2e2 e6e7 Kg8f7 Dg1g6+ Kf7xe7 Dg6xg7+ Ke7d8 Dg7f6+ Kd8d7 Df6d6+ Kd7c8 Dd6xc6+ Kc8b8 Dc6e8+ Kb8c7
 28/26	02:12	 101.361k	766k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5xb3 De6c8+ Kh8h7 Dc8f5+ Kh7h8
 28/20	02:12	 101.361k	766k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6c8+ Kh8h7 Dc8f5+ Kh7h8 Df5f8+ Kh8h7
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 29/43	03:38	 155.094k	710k	+4,09	Lg8h7 Dh3h4 Da7a8 Le6g4 b4b3 a2a3 Da8a5+ Ke1d1 Lh7g8 f4f5 Da5a6 Lg4e2 Da6c8 e5e6 Lg8xe6 f5xe6 Dc8xe6 Kd1d2 g7g5 h5xg6/ep De6xg6 Le2g4 Dg6g5 Dh4xg5 h6xg5 Kd2c3 Kh8g7
 29/61	03:38	 155.094k	710k	+1,47	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6g4 Dd3d2+ Dg4e2 Dd2b2 e5e6 Kh8g8 f4f5 Kg8f8 Kf2f1 Kf8g8 De2f2 Db2c1+ Kf1g2 Dc1d1 Kg2g3 Dd1xh5 Kg3f4 Dh5e8 Kf4g4 De8d8 Df2h4 Dd8f8 Dh4h5 Df8f6 Kg4g3 Df6f8 Kg3h3 Df8f6 Kh3g4 Df6e7 Dh5g6 De7f8 Kg4h3 Df8e7 Kh3g3 De7c7+ Kg3g2 Dc7e7 Kg2h3 De7f8 e6e7 Df8xe7
 29/48	03:38	 155.094k	710k	 0,00	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8 a2a3 Da7a5+ Ke1e2 Da5a6+ Ke2f2 Da6a5
 29/26	03:38	 155.094k	710k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5xb3 De6c8+ Kh8h7 Dc8f5+ Kh7h8 Df5f8+ Kh8h7
 29/20	03:38	 155.094k	710k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6c8+ Kh8h7 Dc8f5+ Kh7h8
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 30/45	05:12	 220.089k	703k	+4,26	Da7a6 Le6g4 Da6a5 Ke1f2 Da5d8 Lg4d7 Dd8a5 Dh3g4 b4b3 a2xb3 Da5d2+ Dg4e2 Dd2c1 b3xa4 Dc1h1 De2g4 Dh1h2+ Dg4g2 Dh2xh5 Kf2e1 Dh5h4+ Ke1d2 Dh4d8 Ld7xc6 Lg8e6 Kd2c2 g7g5 f4xg5 h6xg5 Dg2g3 g5g4 Kc2b3 Kh8g7 Lc6b5 Kg7g6 c5c6 Dd8f8 c6c7 Df8f3
 30/52	05:12	 220.089k	703k	+1,13	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 De6e8+ Kh8h7 Ke1f2 Da6d3 De8g6+ Kh7g8 Dg6e6+ Kg8h7 De6g4 Dd3d2+ Dg4e2 Dd2c1 Kf2g2 Kh7g8 f4f5 Dc1b2 De2f2 Db2a1 e5e6 Da1d1 Kg2g3 Dd1xh5 Kg3f4 Dh5e8 Kf4g4 De8d8 Df2h4 Dd8f8 Dh4h2 Df8f6 Dh2h5 Df6e7 Dh5g6 De7f8 Kg4h3 Df8e7 Kh3g3 Kg8f8 Kg3g2 Kf8g8 Kg2h3 Kg8f8 Dg6g3 Kf8g8
 30/48	05:12	 220.089k	703k	 0,00	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8
 30/20	05:12	 220.089k	703k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5xb3 De6c8+ Kh8h7 Dc8f5+ Kh7h8 Df5f8+ Kh8h7
 30/20	05:12	 220.089k	703k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6c8+ Kh8h7 Dc8f5+ Kh7h8
---------------------------------------------------------------------------
 30/45	06:01	 257.562k	712k	+4,26	Da7a6 Le6g4 Da6a5 Ke1f2 Da5d8 Lg4d7 Dd8a5 Dh3g4 b4b3 a2xb3 Da5d2+ Dg4e2 Dd2c1 b3xa4 Dc1h1 De2g4 Dh1h2+ Dg4g2 Dh2xh5 Kf2e1 Dh5h4+ Ke1d2 Dh4d8 Ld7xc6 Lg8e6 Kd2c2 g7g5 f4xg5 h6xg5 Dg2g3 g5g4 Kc2b3 Kh8g7 Lc6b5 Kg7g6 c5c6 Dd8f8 c6c7 Df8f3
 31/65	06:01	 257.562k	712k	+3,50	a4a3 b2b3 Lg8xe6 Dh3xe6 Da7a6 Ke1f2 Da6d3 De6xc6 Dd3b1 Dc6e8+ Kh8h7 De8g6+ Kh7h8 Kf2g3 Db1g1+ Kg3h4 Dg1xe3 Kh4g4 De3d2 Kg4f5 e4e3 Kf5e6 e3e2 c5c6 e2e1D c6c7 De1c1 Dg6e8+ Kh8h7 c7c8T Dc1xc8+ De8xc8 Dd2xd4 f4f5 Dd4c3 Dc8e8 Dc3e3 Ke6d6 De3b6+ Kd6xd5 Db6a5+ Kd5e4 Da5c7 f5f6 g7xf6 De8g6+ Kh7h8 Dg6xf6+ Kh8g8 Df6g6+ Kg8f8
 31/46	06:01	 257.562k	712k	 0,00	Lg8xe6 Dh3xe6 b4b3 De6e8+ Kh8h7 De8g6+ Kh7h8 a2a3 Da7a5+ Ke1e2 Da5a6+ Ke2f2 Da6a5 Dg6g1 Da5d2+ Kf2g3 Dd2xb2 e5e6 Kh8g8 Kg3h4 Db2c2 f4f5 Dc2e2 f5f6 g7g5+ h5xg6/ep De2f3 Dg1g3 Df3xf6+ Kh4h5 b3b2 Dg3b8+ Df6f8 Db8xb2 Df8f3+ Kh5xh6 Df3xe3+ Kh6h5 De3h3+ Kh5g5 Dh3g3+ Kg5f5 Dg3h3+
 31/20	06:01	 257.562k	712k	 0,00	Da7a5 Ke1e2 b4b3 a2xb3 Lg8xe6 Dh3xe6 Da5b5+ Ke2f2 Db5xb3 De6c8+ Kh8h7 Dc8g4 Db3xb2+ Kf2g3 Db2c1 Dg4f5+ Kh7g8 Df5c8+ Kg8h7
 31/20	06:01	 257.562k	712k	 0,00	b4b3 a2xb3 a4xb3 Le6xg8 Da7a1+ Ke1f2 Kh8xg8 Dh3e6+ Kg8h8 De6c8+ Kh8h7 Dc8f5+ Kh7h8
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Andrew
Posts: 231
Joined: Thu Mar 09, 2006 12:51 am
Location: Australia

Re: Some Mysterious Bug in Stockfish

Post by Andrew »

On my old 4 core machine (runnning 4 threads) Dragon 3.2 switches to 37. Bxe6, and stays with it , after these times

26s, 12s, 4s, 5s, 15s

Andrew
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Jouni
Posts: 3754
Joined: Wed Mar 08, 2006 8:15 pm
Full name: Jouni Uski

Re: Some Mysterious Bug in Stockfish

Post by Jouni »

SF sees that Bxe6 wins, but it takes time. Nobodys perfect.

Analysis by Stockfish dev-20230505-2429e162:

...
37.Bxe6 Qa5 38.Ke2 Qa6+ 39.Kf2 Bxe6 40.Qxe6 Qd3 41.Qxc6 Qd1 42.Qe8+ Kh7 43.Qg6+ Kg8 44.Qg1 Qf3+ 45.Ke1 Qxh5 46.a3 bxa3 47.bxa3 Qf5 48.Ke2 Qd7 49.Qc1 Qc6 50.f5 h5 51.Qg1 h4 52.f6 Qb5+ 53.Kf2 Qb2+ 54.Kf1 Qb5+ 55.Kg2 gxf6 56.Kh3+ Kf7 57.Qf2 Qb1 58.Qxf6+ Ke8 59.Qe6+ Kf8 60.Qf5+ Ke7 61.c6 Qh1+ 62.Kg4 Qg1+ 63.Kh5 Qxe3 64.Qd7+ Kf8 65.Qd8+ Kf7 66.Qxd5+ Kg7 67.Qd7+ Kf8 68.Qf5+ Ke7
+- (3.54) Depth: 41/63 00:05:43 2756mN, tb=65266
Jouni
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Eelco de Groot
Posts: 4692
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Re: Some Mysterious Bug in Stockfish

Post by Eelco de Groot »

Crystal 5 KWK, single thread, with a NNUE from Stockfish will play it after a while, from depth 37 on, score is gradually rising above +8 !


[fen]6bk/q5p1/2p1p2p/2PpP2P/pp1PpPB1/4P2Q/PP6/4K3 w - -[/fen]

Code: Select all

Engine: Crystal 5 KWK NNUE II (512 MB)
gemaakt door the Stockfish developers (see AUTHORS f

16/27  0:01   +0.29    37.Dh4 Dd7 38.Kd1 Lh7 39.Kc2 Lf5 
                       40.Lxf5 exf5 41.b3 a3 42.De1 De8 
                       43.Dxb4 Dxh5 44.e6 Dh2+ 45.Dd2 (1.165.073) 901 

17/30  0:02   +0.22    37.Dh4 Da6 38.Le2 Da5 39.Kd1 a3 
                       40.b3 Dc7 41.Lg4 Dd7 42.Dh3 Db7 
                       43.Dh2 Da6 44.De2 Dxe2+ 45.Kxe2 Lf7 
                       46.Kd2 Kg8 (1.858.889) 927 

18/29  0:02   +0.18    37.Dh4 Da6 38.Le2 Da5 39.Kd1 a3 
                       40.b3 Dc7 41.Lg4 Dd7 42.Dh3 Db7 
                       43.Ke1 Da6 44.Df1 Dxf1+ 45.Kxf1 Lf7 
                       46.f5 exf5 47.Lxf5 Le8 48.Lg6 Lxg6 
                       49.hxg6 Kg8 50.Kf2 (2.100.553) 934 

19/31  0:02   +0.21    37.Dh4 Da6 38.Le2 Da5 39.Kd1 a3 
                       40.b3 Dc7 41.Lg4 Dd7 42.Dh3 Db7 
                       43.Ke1 Da6 44.Df1 Dxf1+ 45.Kxf1 Lf7 
                       46.f5 exf5 47.Lxf5 Le8 48.Kg2 Kg8 
                       49.Kg3 Kf8 50.Kh4 (2.235.989) 938 

20/31  0:03   +0.13    37.Dh4 Da6 38.Le2 Da5 39.Kd1 a3 
                       40.b3 Dc7 41.Lg4 Dd7 42.Dh3 Dd8 
                       43.Ke1 Lf7 44.f5 exf5 45.Lxf5 Dg5 
                       46.Lg4 Kg8 47.Kd2 Le8 48.Le2 Kh7 
                       49.Lg4 (2.848.845) 947 

21/32  0:03   0.00     37.Dh4 Da6 38.Le2 Da5 39.Kd1 a3 
                       40.b3 Dc7 41.Lg4 Dd7 42.Dh3 Dd8 
                       43.Ke1 Lf7 44.f5 exf5 45.Lxf5 Dg5 
                       46.Lg4 Kg8 47.Kd2 Le8 48.Ke2 Kh7 
                       49.Kd2 (2.973.816) 949 

22/34  0:03   0.00     37.Dh4 Da6 38.Le2 Da5 39.Kd1 a3 
                       40.b3 Dc7 41.Lg4 Dd7 42.Dh3 Dd8 
                       43.Ke1 Lf7 44.f5 exf5 45.Lxf5 Dg5 
                       46.Lg4 Kg8 47.Kd2 Le8 48.Ke2 Kh7 
                       49.Kd2 (3.129.845) 950 

23/44  0:03   +0.02++  37.Dh4 (3.322.986) 952 

23/44  0:03   +0.04++  37.Dh4 (3.393.647) 954 

23/44  0:03   +0.07    37.Dh4 Da6 38.Le2 Da5 39.Kd1 a3 
                       40.b3 Dc7 41.Lg4 Dd7 42.Dh3 Dd8 
                       43.Ke1 Lf7 44.Kf2 De8 45.Dh4 Lg8 
                       46.Le2 Lh7 47.Dh2 Lf5 48.Kg1 (3.604.494) 951 

24/30  0:03   +0.15++  37.Dh4 (3.680.773) 952 

24/42  0:04   +0.10--  37.Dh4 Da6 (4.296.971) 945 

24/42  0:04   +0.14++  37.Kf2 (4.504.288) 946 

24/42  0:04   +0.23++  37.Kf2 (4.580.589) 946 

24/42  0:05   +0.35++  37.Kf2 (4.734.030) 946 

24/42  0:05   +0.51++  37.Kf2 (4.902.506) 946 

24/44  0:06   +0.64    37.Kf2 b3 38.a3 Da6 39.Le2 Dc8 
                       40.Dh4 Dd7 41.Kg2 De8 42.Lg4 Dc8 
                       43.De1 De8 44.De2 De7 45.Kg3 Lf7 
                       46.Df1 De8 47.Dh3 De7 48.Kf2 Dd8 
                       49.f5 exf5 50.Lxf5 (6.484.606) 936 

25/36  0:07   +0.58--  37.Kf2 b3 (6.860.528) 935 

25/36  0:07   +0.56--  37.Kf2 b3 (6.951.894) 936 

25/39  0:07   +0.52--  37.Kf2 b3 (7.025.941) 937 

25/39  0:07   +0.48--  37.Kf2 b3 (7.094.623) 937 

25/39  0:07   +0.42--  37.Kf2 b3 (7.247.625) 936 

25/39  0:08   +0.34--  37.Kf2 b3 (7.615.601) 935 

25/40  0:08   +0.40++  37.Kf2 (8.105.959) 935 

25/40  0:09   +0.32    37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (8.623.102) 936 

26/32  0:09   0.00--   37.Kf2 b3 (8.760.515) 936 

26/37  0:09   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (8.939.366) 936 

27/30  0:09   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (9.277.271) 936 

28/30  0:10   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (9.664.496) 936 

29/30  0:12   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (11.318.050) 933 

30/30  0:12   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (11.775.310) 932 

31/30  0:13   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (12.412.979) 932 

32/30  0:14   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (13.730.778) 929 

33/30  0:18   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (17.327.497) 923 

34/30  0:19   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (18.214.600) 922 

35/30  0:21   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (19.819.129) 921 

36/30  0:24   0.00     37.Kf2 b3 38.axb3 axb3 39.Kg3 Da1 
                       40.Dh2 Lf7 41.f5 exf5 42.Lxf5 Lxh5 
                       43.Ld7 Dd1 44.Df2 Kg8 45.Lxc6 Dg4+ 
                       46.Kh2 Lf7 47.La4 Dh5+ 48.Kg1 Dd1+ 
                       49.Df1 Dg4+ 50.Dg2 (22.142.081) 918 

37/45  0:33   +0.04++  37.Lxe6 (30.388.311) 918 

37/45  0:34   +0.09++  37.Lxe6 (31.770.594) 919 

37/45  0:35   +0.16++  37.Lxe6 (32.687.990) 920 

37/45  0:36   +0.25++  37.Lxe6 (33.542.749) 922 

37/50  0:38   +0.37++  37.Lxe6 (35.386.889) 924 

37/50  0:42   +0.53++  37.Lxe6 (39.571.615) 924 

37/53  0:47   +0.74++  37.Lxe6 (44.137.003) 925 

37/53  0:57   +1.00++  37.Lxe6 (53.095.923) 927 

37/53  1:11   +1.34++  37.Lxe6 (66.683.757) 928 

37/53  1:36   +1.76++  37.Lxe6 (89.332.268) 928 

37/53  2:10   +2.31++  37.Lxe6 (121.008.038) 930 

37/53  3:13   +3.00++  37.Lxe6 (179.010.390) 926 

37/53  4:38   +3.86++  37.Lxe6 (255.339.740) 916 

37/78  7:14   +4.95++  37.Lxe6 (396.294.579) 911 

37/78  12:30  +6.32++  37.Lxe6 (677.137.811) 901 

37/78  15:57  +6.33    37.Lxe6 b3 38.a3 Da5+ 39.Ke2 Lxe6 
                       40.Dxe6 Dd8 41.Dxc6 Dh4 42.De8+ Kh7 
                       43.Dg6+ Kg8 44.Dg1 Dxh5+ 45.Kd2 De8 
                       46.Df1 h5 47.Kc3 h4 48.Kb4 Kf7 
                       49.Dh3 Db8+ 50.Kxa4 (862.774.296) 900 

38/65  18:46  +6.45    37.Lxe6 b3 38.a3 Da5+ 39.Ke2 Lxe6 
                       40.Dxe6 Dd8 41.Dxc6 Dh4 42.De8+ Kh7 
                       43.Dg6+ Kg8 44.Dg1 Dxh5+ 45.Kd2 De8 
                       46.Df1 h5 47.Kc3 h4 48.Kb4 De6 49.f5 Dc8 
                       50.Ka5 (1.014.598.700) 901 

39/69  20:50  +6.48--  37.Lxe6 Lxe6 (1.125.105.473) 900 

39/69  20:54  +6.45--  37.Lxe6 Lxe6 (1.129.673.469) 900 

39/69  21:50  +6.54++  37.Lxe6 (1.178.126.495) 899 

39/69  22:17  +6.42--  37.Lxe6 Lxe6 (1.202.665.273) 899 

39/69  22:18  +6.36--  37.Lxe6 Lxe6 (1.203.592.364) 899 

39/69  23:13  +6.43++  37.Lxe6 (1.251.969.269) 898 

39/70  24:18  +6.53++  37.Lxe6 (1.309.397.785) 897 

39/70  26:51  +6.66++  37.Lxe6 (1.443.866.454) 896 

39/70  31:15  +6.83++  37.Lxe6 (1.678.915.129) 894 

39/82  38:00  +7.05++  37.Lxe6 (2.036.978.589) 893 

39/82  47:39  +8.06++  37.Lxe6 (2.545.994.325) 890 

39/82  52:03  +8.06    37.Lxe6 Lxe6 38.Dxe6 b3 39.a3 Da5+ 
                       40.Ke2 Dd8 41.Dxc6 Dh4 42.De8+ Kh7 
                       43.Dg6+ Kg8 44.Dg1 Dxh5+ 45.Kd2 De8 
                       46.Df1 h5 47.Kc3 h4 48.Kb4 Df8 
                       49.Da6 Kh7 50.Kxa4 (2.780.644.190) 890 

40/75  54:33  +7.99--  37.Lxe6 Lxe6 (2.911.980.246) 889 

40/75  54:33  +7.96--  37.Lxe6 Lxe6 (2.912.118.535) 889 

40/75  54:33  +7.93--  37.Lxe6 Lxe6 (2.912.219.187) 889 

40/75  54:33  +7.87--  37.Lxe6 Lxe6 (2.912.338.481) 889 

40/75  54:33  +7.82--  37.Lxe6 Lxe6 (2.912.429.624) 889 

40/75  54:33  +7.74--  37.Lxe6 Lxe6 (2.912.503.986) 889 

40/75  54:34  +7.63--  37.Lxe6 Lxe6 (2.913.149.307) 889 

40/75  54:35  +6.95--  37.Lxe6 Lxe6 (2.914.064.577) 889 

40/75  54:35  +6.60--  37.Lxe6 Lxe6 (2.914.315.989) 889 

40/75  56:00  +6.89++  37.Lxe6 (2.987.682.122) 889 

40/75  59:06  +7.75++  37.Lxe6 (3.150.203.073) 888 

40/79  69:21  +8.09++  37.Lxe6 (3.681.617.056) 884 

40/91  85:17  +8.35    37.Lxe6 Da5 38.Ke2 Da6+ 39.Kf2 Da5 
                       40.Lg4 Lf7 41.Le2 Dd8 42.Kg3 Lg8 
                       43.Lg4 De8 44.Ld7 De7 45.b3 axb3 
                       46.axb3 Dd8 47.e6 Lh7 48.Dg4 Lg8 
                       49.Dg6 Df8 50.Lxc6 (4.483.738.960) 876 

41/08  85:17  +8.47--  37.Lxe6 Da5 (4.484.256.466) 876 

41/08  85:18  +8.45--  37.Lxe6 Da5 (4.484.317.201) 876 

41/08  85:18  +8.40--  37.Lxe6 Da5 (4.484.458.680) 876 

41/63  89:43  +8.50++  37.Lxe6 (4.711.373.337) 875 

41/77  98:04  +8.56++  37.Lxe6 (5.145.504.211) 874 

41/77  104:31 +8.36--  37.Lxe6 Da5 (5.479.126.617) 873 

41/77  104:35 +8.25--  37.Lxe6 Da5 (5.482.130.995) 873 

41/77  106:25 +7.61--  37.Lxe6 Da5 (5.575.128.791) 873 

41/77  106:26 +7.27--  37.Lxe6 Da5 (5.576.227.944) 873 

41/77  106:27 +6.84--  37.Lxe6 Da5 (5.577.167.834) 873 

41/77  107:33 +7.20++  37.Lxe6 (5.631.911.692) 872 

41/77  109:17 +8.26++  37.Lxe6 (5.721.380.802) 872 

41/86  124:43 +8.70++  37.Lxe6 (6.500.970.798) 868 

41/86  127:37 +8.65    37.Lxe6 Da5 38.Ke2 b3 39.a3 Lxe6 
                       40.Dxe6 Dd8 41.Dxc6 Dh4 42.De8+ Kh7 
                       43.Dg6+ Kg8 44.Dg1 Dxh5+ 45.Kd2 De8 
                       46.Df1 h5 47.Kc3 h4 48.Kb4 De6 49.f5 Dc8 
                       50.Ka5 (6.652.934.578) 868
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
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CornfedForever
Posts: 650
Joined: Mon Jun 20, 2022 4:08 am
Full name: Brian D. Smith

Re: Some Mysterious Bug in Stockfish

Post by CornfedForever »

Why do you think there is a 'bug'?
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Eelco de Groot
Posts: 4692
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Re: Some Mysterious Bug in Stockfish

Post by Eelco de Groot »

Well, replying for the first poster, is 36...Qa7 not, for us humans, pretty counterintuitive move? The lower your Elo the less likely you would play it I predict. I am -reasonably- sure it is some horizon problem and in that sense it is not so wrong to call it a bug... I don't have any of the Fritzes but I think it is this sort of moves that Frans Morsch wanted his computer not to make. Try Fritz 5.32 :) I have no idea... It is a consequence of focusing too much on Elo that modern programs play such moves :)
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
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User avatar
Eelco de Groot
Posts: 4692
Joined: Sun Mar 12, 2006 2:40 am
Full name:   Eelco de Groot

Re: Some Mysterious Bug in Stockfish

Post by Eelco de Groot »

I let it run for several days. Then, after a restart, Crystal now almost goes to +10

Code: Select all

6bk/q5p1/2p1p2p/2PpP2P/pp1PpPB1/4P2Q/PP6/4K3 w - -

Engine: Crystal 5 KWK NNUE II (512 MB)
gemaakt door the Stockfish developers (see AUTHORS f

25/41  0:01   +9.44    37.Lxe6 Da5 38.Ke2 Lxe6 39.Dxe6 Dd8 
                       40.Dg4 Kg8 41.Kf2 b3 42.axb3 a3 
                       43.bxa3 Da5 44.b4 Da4 45.f5 Dc2+ 
                       46.De2 Dc1 47.f6 Kf7 48.fxg7 Dh1 
                       49.Dg4 Kg8 50.Df4 (1.418.228) 930 

26/44  0:01   +9.44    37.Lxe6 Da5 38.Ke2 Lxe6 39.Dxe6 Dd8 
                       40.Dg4 Kg8 41.Kf2 b3 42.axb3 a3 
                       43.bxa3 Da5 44.b4 Da4 45.f5 Dc2+ 
                       46.De2 Dc1 47.f6 Kf7 48.fxg7 Dh1 
                       49.Dg4 Kg8 50.Df4 (1.468.103) 933 

27/58  0:01   +9.44    37.Lxe6 Da5 38.Ke2 Lxe6 39.Dxe6 Dd8 
                       40.Dg4 Kg8 41.Kf2 b3 42.axb3 a3 
                       43.bxa3 Da5 44.b4 Da4 45.f5 Dc2+ 
                       46.De2 Dc1 47.f6 Kf7 48.fxg7 Kxg7 
                       49.Dg4+ Kf8 50.Df5+ (1.802.913) 935 

28/65  0:03   +9.39--  37.Lxe6 Da5 (3.206.884) 942 

28/65  0:03   +9.37--  37.Lxe6 Da5 (3.212.710) 942 

28/65  0:03   +9.34--  37.Lxe6 Da5 (3.232.414) 942 

28/65  0:03   +9.44++  37.Lxe6 (3.249.084) 942 

28/65  0:03   +9.29--  37.Lxe6 Da5 (3.396.129) 940 

28/65  0:03   +9.21--  37.Lxe6 Da5 (3.412.953) 940 

28/65  0:03   +9.30++  37.Lxe6 (3.425.468) 941 

28/65  0:03   +9.44++  37.Lxe6 (3.449.911) 941 

28/66  0:05   +9.11--  37.Lxe6 Da5 (5.077.447) 927 

28/66  0:05   +9.36++  37.Lxe6 (5.243.637) 926 

28/66  0:06   +9.44    37.Lxe6 Da5 38.Ke2 Lxe6 39.Dxe6 Dd8 
                       40.Dg4 Kg8 41.Kf2 b3 42.axb3 a3 
                       43.bxa3 Da5 44.b4 Da4 45.f5 Dc2+ 
                       46.De2 Dc1 47.f6 gxf6 48.Dg4+ Kf8 
                       49.Dc8+ Ke7 50.exf6+ (6.226.500) 933 

29/56  0:09   +9.37--  37.Lxe6 Da5 (9.086.113) 934 

29/56  0:09   +9.34--  37.Lxe6 Da5 (9.109.715) 935 

29/56  0:09   +9.30--  37.Lxe6 Da5 (9.125.499) 935 

29/56  0:09   +9.24--  37.Lxe6 Da5 (9.135.413) 935 

29/56  0:09   +9.18--  37.Lxe6 Da5 (9.151.098) 935 

29/56  0:09   +9.32++  37.Lxe6 (9.178.309) 936 

29/56  0:09   +9.42++  37.Lxe6 (9.257.265) 936 

29/56  0:20   +9.55++  37.Lxe6 (19.430.981) 933 

29/66  0:28   +9.55    37.Lxe6 Da5 38.Ke2 Lxe6 39.Dxe6 Da6+ 
                       40.Kf2 Dd3 41.Dxc6 Dd2+ 42.Kg3 Dxe3+ 
                       43.Kg4 Df3+ 44.Kf5 Dxh5+ 45.Ke6 e3 
                       46.Da8+ Kh7 47.c6 e2 48.c7 e1D 
                       49.c8D Dg6+ 50.Kd7 (26.499.698) 940 

30/70  0:40   +9.62--  37.Lxe6 Da5 (38.914.486) 952 

30/70  0:45   +9.59--  37.Lxe6 Da5 (43.558.257) 963 

30/70  0:50   +9.64    37.Lxe6 Da5 38.Ke2 Lxe6 39.Dxe6 Da6+ 
                       40.Kf2 Dd3 41.Dxc6 Dd2+ 42.Kg3 Dxe3+ 
                       43.Kg4 De2+ 44.Kf5 Dxh5+ 45.Ke6 Kh7 
                       46.Da8 e3 47.c6 Dg6+ 48.Kd7 Df5+ 
                       49.Kd6 e2 50.c7 (48.666.773) 964 

31/70  1:44   +9.58--  37.Lxe6 Da5 (101.844.593) 970 

31/70  1:48   +9.61    37.Lxe6 Da5 38.Ke2 Lxe6 39.Dxe6 Da6+ 
                       40.Kf2 Dd3 41.Dxc6 Dd2+ 42.Kg3 Dxe3+ 
                       43.Kg4 Df3+ 44.Kf5 b3 45.a3 e3 
                       46.De8+ Kh7 47.Dg6+ Kg8 48.Ke6 Dxf4 
                       49.Kd7 e2 50.De8+ (105.367.747) 966 

32/75  2:15   +9.64    37.Lxe6 Da5 38.Ke2 Lxe6 39.Dxe6 Da6+ 
                       40.Kf2 Dd3 41.Dxc6 Dd2+ 42.Kg3 Dxe3+ 
                       43.Kg4 Df3+ 44.Kf5 Dxh5+ 45.Ke6 Kh7 
                       46.Da8 e3 47.c6 Dg6+ 48.Kd7 Df5+ 
                       49.Kd6 e2 50.c7 (130.464.626) 960 

33/78  4:37   +9.65--  37.Lxe6 Da5 (260.735.418) 938 

33/78  4:41   +9.63    37.Lxe6 Da5 38.Ke2 Lxe6 39.Dxe6 Dd8 
                       40.Dg4 Kg8 41.Kf2 b3 42.axb3 Da5 
                       43.bxa4 Dd2+ 44.De2 Db4 45.f5 Kf7 
                       46.Kg3 Ke8 47.Df2 Dxa4 48.f6 gxf6 
                       49.Dxf6 Da1 50.Dxc6+ (263.968.392) 938 

34/76  5:17   +9.55--  37.Lxe6 Da5 (296.205.628) 931 

34/76  5:17   +9.52--  37.Lxe6 Da5 (296.256.150) 931 

34/76  5:33   +9.49--  37.Lxe6 Da5 (309.845.305) 929 

34/76  5:33   +9.44--  37.Lxe6 Da5 (309.953.356) 929 

34/76  5:33   +9.37--  37.Lxe6 Da5 (310.003.325) 929 

34/76  5:33   +9.45++  37.Lxe6 (310.279.579) 929 

34/76  5:46   +9.55++  37.Lxe6 (320.778.795) 927 

34/76  5:46   +9.43    37.Lxe6 Da5 38.Ke2 b3 39.a3 Lxe6 
                       40.Dxe6 Dd8 41.Dxc6 Dh4 42.De8+ Kh7 
                       43.Dg6+ Kg8 44.Dg1 Dxh5+ 45.Kd2 De8 
                       46.Df1 h5 47.Kc3 h4 48.Kb4 g6 49.Db5 De7 
                       50.Da6 (320.859.880) 926 

35/76  5:58   +9.30--  37.Lxe6 Da5 (331.743.748) 926 

35/76  5:58   +9.28--  37.Lxe6 Da5 (331.902.420) 926 

35/76  5:58   +9.25--  37.Lxe6 Da5 (332.017.204) 926 

35/76  5:58   +9.20--  37.Lxe6 Da5 (332.093.557) 926 

35/76  5:59   +9.27++  37.Lxe6 (332.708.369) 925 

35/76  6:01   +9.35++  37.Lxe6 (334.388.357) 926 

35/76  6:25   +9.45++  37.Lxe6 (356.767.920) 924 

35/76  7:40   +9.14--  37.Lxe6 Da5 (422.076.731) 916 

35/76  7:40   +9.36++  37.Lxe6 (422.514.895) 916 

35/76  8:23   +9.21    37.Lxe6 Da5 38.Ke2 b3 39.a3 Lxe6 
                       40.Dxe6 Dd8 41.Dxc6 Dh4 42.De8+ Kh7 
                       43.Dg6+ Kg8 44.Dg1 Dxh5+ 45.Kd2 De8 
                       46.Df1 h5 47.Kc3 h4 48.Kb4 Dc8 
                       49.Db5 h3 50.c6 (457.960.734) 910 

36/74  8:49   +9.30    37.Lxe6 Da5 38.Ke2 b3 39.a3 Lxe6 
                       40.Dxe6 Dd8 41.Dxc6 Dh4 42.De8+ Kh7 
                       43.Dg6+ Kg8 44.Dg1 Dxh5+ 45.Kd2 De8 
                       46.Df1 h5 47.Kc3 h4 48.Kb4 Dc8 
                       49.Db5 h3 50.c6 (480.846.846) 907 

37/68  10:57  +9.63    37.Lxe6 Da5 38.Ke2 b3 39.a3 Lxe6 
                       40.Dxe6 Dd8 41.Dxc6 Dh4 42.De8+ Kh7 
                       43.Dg6+ Kg8 44.Dg1 Dxh5+ 45.Kd2 De8 
                       46.Df1 h5 47.Kc3 h4 48.Kb4 Dc8 
                       49.Db5 h3 50.c6 (583.658.853) 888 

38/87  14:00  +9.70--  37.Lxe6 Da5 (718.523.941) 855 

38/87  14:00  +9.67--  37.Lxe6 Da5 (718.567.030) 855 

38/87  14:00  +9.64--  37.Lxe6 Da5 (718.587.300) 855 

38/87  14:00  +9.59--  37.Lxe6 Da5 (718.615.877) 855 

38/87  14:11  +9.67++  37.Lxe6 (727.727.845) 854 

38/87  15:23  +9.53--  37.Lxe6 Lxe6 (788.954.567) 854 

38/87  15:23  +9.43--  37.Lxe6 Lxe6 (789.155.488) 854 

38/87  15:24  +9.53++  37.Lxe6 (789.507.575) 854 

38/87  15:35  +9.70++  37.Lxe6 (799.308.812) 854 

38/87  22:24  +9.68    37.Lxe6 Da5 38.Ke2 Lxe6 39.Dxe6 Dd8 
                       40.Dg4 Kg8 41.Kf2 b3 42.axb3 Da5 
                       43.bxa4 Dd2+ 44.De2 Db4 45.f5 Kf7 
                       46.Kg3 Ke8 47.e6 Db3 48.Df2 Dd1 
                       49.a5 Dh1 50.a6 (1.149.463.769) 855 

39/80  23:20  +9.53--  37.Lxe6 Da5 (1.203.679.697) 859 

39/80  23:20  +9.50--  37.Lxe6 Da5 (1.204.368.494) 859 

39/80  23:20  +9.47--  37.Lxe6 Da5 (1.204.458.766) 859 

39/80  24:00  +9.57++  37.Lxe6 (1.239.413.617) 860 

39/80  25:21  +9.63++  37.Lxe6 (1.311.554.841) 862 

39/80  27:33  +9.71++  37.Lxe6 (1.430.895.860) 865 

39/80  30:21  +9.42--  37.Lxe6 Da5 (1.589.814.496) 872 

39/80  30:47  +9.62++  37.Lxe6 (1.611.991.431) 872 

39/80  44:33  +9.79++  37.Lxe6 (2.302.959.338) 861 

39/80  46:04  +9.74    37.Lxe6 Da5 38.Ke2 b3 39.a3 Lxe6 
                       40.Dxe6 Dd8 41.Dxc6 Dh4 42.De8+ Kh7 
                       43.Dg6+ Kg8 44.Dg1 Dxh5+ 45.Kd2 De8 
                       46.Df1 h5 47.Kc3 h4 48.Kb4 g6 49.Db5 De7 
                       50.Da6 (2.380.456.599) 861 

40/81  49:56  +9.88--  37.Lxe6 Da5 (2.581.900.661) 861 

40/81  49:56  +9.86--  37.Lxe6 Da5 (2.582.053.298) 861 

40/81  49:56  +9.82--  37.Lxe6 Da5 (2.582.271.299) 861 

40/81  52:44  +9.93++  37.Lxe6 (2.728.670.491) 862 

40/81  60:40  +9.78--  37.Lxe6 Da5 (3.152.316.363) 865 

40/81  61:59  +9.88++  37.Lxe6 (3.221.103.099) 866 

40/83  68:39  +9.70--  37.Lxe6 Da5 (3.566.367.860) 865 

40/83  69:25  +9.57--  37.Lxe6 b3 (3.605.093.890) 865 

40/83  69:47  +9.70++  37.Lxe6 (3.623.823.986) 865 

40/83  72:55  +9.92++  37.Lxe6 (3.782.652.555) 864
40/83 99:53 +9.96 37.Lxe6 Da6 38.Kf2 Da5 39.Lg4 Lf7
40.Le2 Dc7 41.Df5 De7 42.Dc8+ Kh7
43.Kg3 g6 44.hxg6+ Lxg6 45.Dxc6 Le8
46.Dxd5 Df8 47.c6 h5 48.Dxe4+ Lg6
49.f5 Lxf5 50.Dh4 (5.153.503.278) 859
Debugging is twice as hard as writing the code in the first
place. Therefore, if you write the code as cleverly as possible, you
are, by definition, not smart enough to debug it.
-- Brian W. Kernighan
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abgursu
Posts: 92
Joined: Thu May 14, 2020 3:34 pm
Full name: A. B. Gursu

Re: Some Mysterious Bug in Stockfish

Post by abgursu »

Eelco de Groot wrote: ↑Wed May 10, 2023 8:53 pm Well, replying for the first poster, is 36...Qa7 not, for us humans, pretty counterintuitive move? The lower your Elo the less likely you would play it I predict. I am -reasonably- sure it is some horizon problem and in that sense it is not so wrong to call it a bug... I don't have any of the Fritzes but I think it is this sort of moves that Frans Morsch wanted his computer not to make. Try Fritz 5.32 :) I have no idea... It is a consequence of focusing too much on Elo that modern programs play such moves :)
Well, when SF prefers Qa7 as first move the difference from the second move(if I remember correctly a3) is like 0.03-6 centipawns, so some sort of penalty in classical eval might fix it. I do consider myself as a fine player and I'm dead sure if I was playing this Qa7 the game wouldn't go that crazy and extremely hard to calculate promote over promote way it went but it's just ridiculous to me that even when you're not seeking a win and the difference is too little why does Stockfish tries to go down this Qa7 line? I now understand that it's a matter of calculation, but it's still pretty stupid to put some position like that in any kind of test suite or some topic like hardpositions 2023, since, like you said, ccrl 2600 engines with simple evaluations would score better than Stockfish, clones and Dragon; because the solution is simply taking that free pawn.

PS: I called it a bug because when I posted it it seemed like a bug that Blue Marlin played with a good +2 eval at depth 23(probably a hash move but still) and SF only reaches the move in depths 37-38. And, Blue Marlin is known for the idea of halving the materialistic scale, so the logical expectation is quite the opposite of it. So...
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User avatar
Marek Soszynski
Posts: 587
Joined: Wed May 10, 2006 7:28 pm
Location: Birmingham, England

Re: Some Mysterious Bug in Stockfish

Post by Marek Soszynski »

I think one or two of us misunderstood your point, which isn't why doesn't Stockfish choose 37.Bxe6 sooner but why doesn't Stockfish reject 36...Qa7 sooner.
Marek Soszynski
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