Strange end-game handling by Crafty

[hgm]

In this month's on-line bitz tourney, Crafty managed to lose this game against Telepath for unclear reasons. It seemed a dead draw...

Code: Select all

[Event "Variant-ICS rated blitz game"]
[Site "Variant-ICS, Amsterdam, NL"]
[Date "1996.08.02"]
[Time "23:33:37"]
[Round "-"]
[White "Telepath"]
[Black "CraftyRB"]
[WhiteElo "1770"]
[BlackElo "1985"]
[TimeControl "300+1"]
[Mode "ICS"]
[Result "1-0"]


1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. Bg5 h6 6. Bxf6 Qxf6 7. e3 
Nd7 8. Bd3 dxc4 9. Bxc4 g6 10. O-O Bg7 11. e4 e5 12. d5 Nb6 13. Bb3 Bg4 
14. h3 Bxf3 15. Qxf3 Qxf3 16. gxf3 Ke7 17. dxc6 bxc6 18. Rac1 Rhd8 
{-0.09/21} 19. Rfd1 Rd4 {-0.14/21} 20. Ne2 Rxd1+ {-0.12/23} 21. Rxd1 a5 
{-0.09/23} 22. Nc3 Bf6 {-0.09/22} 23. Na4 Nxa4 {-0.12/21} 24. Bxa4 Rc8 
{-0.12/20} 25. Rc1 c5 {-0.01/20} 26. Rc3 Kf8 {-0.09/19} 27. Kf1 Rb8 {-0.10/19} 
28. b3 Be7 {-0.10/18} 29. Ke2 Rb4 {-0.17/19} 30. Bc6 Rd4 {-0.15/18} 31. 
Rc1 f5 {-0.17/17} 32. a4 Kf7 {-0.24/17} 33. Bd5+ Kg7 {-0.18/18} 34. Bb7 
Bd6 {-0.17/18} 35. Bd5 Kf6 {-0.17/19} 36. Rf1 Be7 {-0.13/18} 37. Rd1 Bd8 
{-0.12/19} 38. Rf1 g5 {-0.12/19} 39. Rd1 Bc7 {-0.12/19} 40. Ra1 h5 {-0.06/18} 
41. Rd1 Bb8 {-0.06/19} 42. Rd3 Bd6 {-0.06/19} 43. Ke3 h4 {-0.06/18} 44. 
Bc4 g4 {-0.17/18} 45. fxg4 Rxe4+ {-0.11/19} 46. Kd2 Rd4 {-0.79/18} 47. 
gxf5 e4 {-1.03/20} 48. Rxd4 cxd4 {-0.90/19} 49. Be6 Bc5 {-1.11/20} 50. Bd7 
d3 {-1.15/21} 51. Bc6 Ke5 {-1.24/21} 52. f3 Bb4+ {-1.25/22} 53. Ke3 d2 
{-1.29/23} 54. Ke2 e3 {-1.29/22} 55. Be4 Bc3 {-1.28/22} 56. Bd3 Kf4 {-1.47/20} 
57. b4 axb4 {-1.47/20} 58. a5 Bd4 {-1.47/20} 59. Bc2 Ke5 {-1.47/20} 60. 
a6 Ba7 {-1.47/20} 61. f4+ Kf6 {-1.47/21} 62. Kf3 Bd4 {-1.47/21} 63. Ke2 
Bb6 {-1.47/21} 64. Kf3 Bc5 {-1.31/21} 65. Ke2 Bd4 {-1.27/21} 66. Kf3 Ba7 
{-1.22/21} 67. Ke2 Bc5 {-1.11/22} 68. Kf3 Bb6 {-1.16/22} 69. Ke2 b3 {-1.11/22} 
70. Bxb3 Kxf5 {-1.03/21} 71. Kf3 Bd4 {-0.86/20} 72. Bd1 Ba7 {-0.75/21} 
73. Be2 Bb6 {-0.36/21} 74. Bd1 Bc5 {-0.36/21} 75. Bb3 Ba7 {-0.11/20} 76. 
Bd1 Bd4 {-0.31/21} 77. Bc2+ Ke6 {-0.31/21} 78. Bd1 Kd5 {-0.27/19} 79. 
Bb3+ Kd6 {-0.27/21} 80. Bd1 Ba7 {-0.01/21} 81. Kg4 Ke6 {-0.01/18} 82. Kxh4 
Kf5 {+0.34/19} 83. Kg3 Bd4 {+0.21/19} 84. h4 Ba7 {+0.34/16} 85. h5 Bd4 
{+0.73/17} 86. Bc2+ Kf6 {+0.78/17} 87. Kf3 Kg7 {+1.16/18} 88. f5 Bc5 {+1.18/18} 
89. Ke2 Ba7 {+1.48/19} 90. Kd3 Bd4 {+1.61/18} 91. Bd1 Bc5 {+1.68/18} 92. 
Ke4 Kf6 {+2.12/19} 93. h6 Ba7 {+3.24/18} 94. Kd3 Kf7 {+10.75/17} 95. Bc2 
d1=R+ {+13.86/15} 96. Bxd1 Bc5 {+13.86/16} 97. Bb3+ Kf6 {+17.16/16} 98. Bc2 
Ba7 {+25.23/16} 99. Ke2 Bc5 {+327.41/15} 100. h7 Kg7 {+327.43/15} 101. 
f6+ Kh8 {+327.49/15} 102. f7 Kg7 103. a7 Bxa7 {+327.49/13} 104. h8=Q+ 
Kxf7 {+327.51/13} 105. Bb3+ Kg6 {+327.53/13} 106. Qg8+ Kf5 {+327.53/13} 
107. Qf7+ Ke5 {+327.55/15} 108. Qc7+ Kf5 {+327.55/14} 109. Qxa7 Ke5 110. 
Qd7 Ke4 111. Qd5+ Kf4 112. Qd4+ Kf5 113. Bf7 Kg5 114. Kxe3 Kh6 115. Qf6+ 
Kh7 116. Qg6+ Kh8 117. Qh6+ 
{Black checkmated} 1-0

[d] 8/8/Pb3k2/5P2/1p3P1p/4p2P/2BpK3/8 b - - 16 69
Position after 69. Ke2

[bob]

In this month's on-line bitz tourney, Crafty managed to lose this game against Telepath for unclear reasons. It seemed a dead draw...

Code: Select all

[Event "Variant-ICS rated blitz game"]
[Site "Variant-ICS, Amsterdam, NL"]
[Date "1996.08.02"]
[Time "23:33:37"]
[Round "-"]
[White "Telepath"]
[Black "CraftyRB"]
[WhiteElo "1770"]
[BlackElo "1985"]
[TimeControl "300+1"]
[Mode "ICS"]
[Result "1-0"]


1. d4 Nf6 2. c4 e6 3. Nf3 d5 4. Nc3 c6 5. Bg5 h6 6. Bxf6 Qxf6 7. e3 
Nd7 8. Bd3 dxc4 9. Bxc4 g6 10. O-O Bg7 11. e4 e5 12. d5 Nb6 13. Bb3 Bg4 
14. h3 Bxf3 15. Qxf3 Qxf3 16. gxf3 Ke7 17. dxc6 bxc6 18. Rac1 Rhd8 
{-0.09/21} 19. Rfd1 Rd4 {-0.14/21} 20. Ne2 Rxd1+ {-0.12/23} 21. Rxd1 a5 
{-0.09/23} 22. Nc3 Bf6 {-0.09/22} 23. Na4 Nxa4 {-0.12/21} 24. Bxa4 Rc8 
{-0.12/20} 25. Rc1 c5 {-0.01/20} 26. Rc3 Kf8 {-0.09/19} 27. Kf1 Rb8 {-0.10/19} 
28. b3 Be7 {-0.10/18} 29. Ke2 Rb4 {-0.17/19} 30. Bc6 Rd4 {-0.15/18} 31. 
Rc1 f5 {-0.17/17} 32. a4 Kf7 {-0.24/17} 33. Bd5+ Kg7 {-0.18/18} 34. Bb7 
Bd6 {-0.17/18} 35. Bd5 Kf6 {-0.17/19} 36. Rf1 Be7 {-0.13/18} 37. Rd1 Bd8 
{-0.12/19} 38. Rf1 g5 {-0.12/19} 39. Rd1 Bc7 {-0.12/19} 40. Ra1 h5 {-0.06/18} 
41. Rd1 Bb8 {-0.06/19} 42. Rd3 Bd6 {-0.06/19} 43. Ke3 h4 {-0.06/18} 44. 
Bc4 g4 {-0.17/18} 45. fxg4 Rxe4+ {-0.11/19} 46. Kd2 Rd4 {-0.79/18} 47. 
gxf5 e4 {-1.03/20} 48. Rxd4 cxd4 {-0.90/19} 49. Be6 Bc5 {-1.11/20} 50. Bd7 
d3 {-1.15/21} 51. Bc6 Ke5 {-1.24/21} 52. f3 Bb4+ {-1.25/22} 53. Ke3 d2 
{-1.29/23} 54. Ke2 e3 {-1.29/22} 55. Be4 Bc3 {-1.28/22} 56. Bd3 Kf4 {-1.47/20} 
57. b4 axb4 {-1.47/20} 58. a5 Bd4 {-1.47/20} 59. Bc2 Ke5 {-1.47/20} 60. 
a6 Ba7 {-1.47/20} 61. f4+ Kf6 {-1.47/21} 62. Kf3 Bd4 {-1.47/21} 63. Ke2 
Bb6 {-1.47/21} 64. Kf3 Bc5 {-1.31/21} 65. Ke2 Bd4 {-1.27/21} 66. Kf3 Ba7 
{-1.22/21} 67. Ke2 Bc5 {-1.11/22} 68. Kf3 Bb6 {-1.16/22} 69. Ke2 b3 {-1.11/22} 
70. Bxb3 Kxf5 {-1.03/21} 71. Kf3 Bd4 {-0.86/20} 72. Bd1 Ba7 {-0.75/21} 
73. Be2 Bb6 {-0.36/21} 74. Bd1 Bc5 {-0.36/21} 75. Bb3 Ba7 {-0.11/20} 76. 
Bd1 Bd4 {-0.31/21} 77. Bc2+ Ke6 {-0.31/21} 78. Bd1 Kd5 {-0.27/19} 79. 
Bb3+ Kd6 {-0.27/21} 80. Bd1 Ba7 {-0.01/21} 81. Kg4 Ke6 {-0.01/18} 82. Kxh4 
Kf5 {+0.34/19} 83. Kg3 Bd4 {+0.21/19} 84. h4 Ba7 {+0.34/16} 85. h5 Bd4 
{+0.73/17} 86. Bc2+ Kf6 {+0.78/17} 87. Kf3 Kg7 {+1.16/18} 88. f5 Bc5 {+1.18/18} 
89. Ke2 Ba7 {+1.48/19} 90. Kd3 Bd4 {+1.61/18} 91. Bd1 Bc5 {+1.68/18} 92. 
Ke4 Kf6 {+2.12/19} 93. h6 Ba7 {+3.24/18} 94. Kd3 Kf7 {+10.75/17} 95. Bc2 
d1=R+ {+13.86/15} 96. Bxd1 Bc5 {+13.86/16} 97. Bb3+ Kf6 {+17.16/16} 98. Bc2 
Ba7 {+25.23/16} 99. Ke2 Bc5 {+327.41/15} 100. h7 Kg7 {+327.43/15} 101. 
f6+ Kh8 {+327.49/15} 102. f7 Kg7 103. a7 Bxa7 {+327.49/13} 104. h8=Q+ 
Kxf7 {+327.51/13} 105. Bb3+ Kg6 {+327.53/13} 106. Qg8+ Kf5 {+327.53/13} 
107. Qf7+ Ke5 {+327.55/15} 108. Qc7+ Kf5 {+327.55/14} 109. Qxa7 Ke5 110. 
Qd7 Ke4 111. Qd5+ Kf4 112. Qd4+ Kf5 113. Bf7 Kg5 114. Kxe3 Kh6 115. Qf6+ 
Kh7 116. Qg6+ Kh8 117. Qh6+ 
{Black checkmated} 1-0

[d] 8/8/Pb3k2/5P2/1p3P1p/4p2P/2BpK3/8 b - - 16 69
Position after 69. Ke2

Do you know anything about it? IE which version? what hardware? Who was running it? Which endgame tables (if any) and such? Crafty disagrees with several of the moves played, giving it about 2 seconds per move at 8M nps on my laptop (with 3-4-5 egtbs).

[Graham Banks]

Do you know anything about it? IE which version? what hardware? Who was running it? Which endgame tables (if any) and such? Crafty disagrees with several of the moves played, giving it about 2 seconds per move at 8M nps on my laptop (with 3-4-5 egtbs).

From Ray:

Crafty 23.2 x64 under Winboard 4.4.CCT12

crafty-232-64-ja.exe (dated 4 Mar 2010, 315KB)
Intel QX6700 (4 cores)
3-4-5 EGTB

crafty.rc
=========
egtb
tbpath=e:\tb
cache=32M
ponder on
swindle on
learn 7
book random 1
bookw freq 0.7
bookw ratio 0.8
bookw eval 0.6
bookw learn 1
bookw cap 0.5
book width 4
book on
show book
log=off
mt=4
timebook 80 8
hash=512M
hashp=32M
exit

[hgm]

I just retreived the game from the ICS through "mailstored", and know little else about is. But I see that Graham could answer your query.

[Sven]

In this month's on-line bitz tourney, Crafty managed to lose this game against Telepath for unclear reasons. It seemed a dead draw...

Take into account that it was blitz, and that this type of endgame may require very deep search to find the "truth". It is possible that the position aftter 69.Ke2 was a dead draw, while it is also possible that the position after 80...Ba7 (or few moves earlier or later) was already lost for Black. But I think if many black moves show a draw score until some late iteration N were reached then this may simply be too difficult to find in a blitz game, even for strong engines < ELO 3000.

Sven