Cometb14 possible bug?

[Andrew Tanner]

Geschrieben von:/Posted by: Andrew Tanner am 31 Januar 2000 16:10:14:
Hello,
When playing the following game in 3 0 blitz vrs Crafty17.5 Cometb14 went on to give away a rook in a winning endgame. Both engines were sharing the same Nalimov tablebases, however, it looks too early for the tablebases to be accessed. Also Comet had about 30 seconds left on it's clock before the major blunder occured. Pondering for both engines was turned on.
[Event "Computer chess game"]
[Site "Win98 16mb hash both engines"]
[Date "2000.02.01"]
[Round "1"]
[White "CometB14"]
[Black "Crafty17.5.exe"]
[Result "0-1"]
[TimeControl "180"]
1. e4 g6 2. d4 Bg7 3. c4 d6 4. Nc3 Nf6 5. f3 Nbd7 6. Be3 e5 7. Be2 O-O 8.
d5 Nc5 9. Qd2 a6 10. O-O-O Bd7 11. Bxc5 dxc5 12. Kb1 Qe7 13. Nh3 Qd6 14.
Nf2 Rad8 15. g4 c6 16. h4 cxd5 17. exd5 b5 18. g5 b4 19. gxf6 bxc3 20. Qxc3
Bxf6 21. Ne4 Bf5 22. h5 g5 23. h6 Bxe4+ 24. fxe4 Rb8 25. Bh5 Rb4 26. Rdf1
Rb7 27. Qf3 Bd8 28. Qf5 a5 29. Rf2 a4 30. a3 Ra7 31. Rg2 Qf6 32. Qxf6 Bxf6
33. Rf1 Bd8 34. Rd2 Rb7 35. Bd1 Ra7 36. d6 f5 37. Rxf5 Rxf5 38. exf5 Kf7
39. Rd5 Ra6 40. Kc2 Kf6 41. Bg4 e4 42. Kd2 Rb6 43. Ke3 Rxb2 44. Kxe4 Rh2
45. Rxc5 Rxh6 46. Rc8 Rh4 47. Rxd8 Rxg4+ 48. Kd5 Rg3 49. d7 Ke7 50. Rh8
Rd3+ 51. Ke4 Rxd7 52. Rxh7+ Kd8 53. Kf3 Rxh7 54. Kg4 Rh4+ 55. Kxg5 Rh3 56.
Kf6 Rxa3 57. Ke5 Rh3 58. f6 a3 59. c5 a2 60. Kd6 a1=Q 61. Ke6 Qe1+ 62. Kf5
Rf3+ 63. Kg6 Qg3+ 64. Kh5 Rf1 65. Kh6 Rh1#
{Black mates} 0-1

[U.Türke]

Geschrieben von:/Posted by: U.Türke am 31 Januar 2000 17:15:01:
Als Antwort auf:/As an answer to: Cometb14 possible bug? geschrieben von:/posted by: Andrew Tanner am 31 Januar 2000 16:10:14:

Hello,
When playing the following game in 3 0 blitz vrs Crafty17.5 Cometb14 went on to give away a rook in a winning endgame. Both engines were sharing the same Nalimov tablebases, however, it looks too early for the tablebases to be accessed. Also Comet had about 30 seconds left on it's clock before the major blunder occured. Pondering for both engines was turned on.
[Event "Computer chess game"]
[Site "Win98 16mb hash both engines"]
[Date "2000.02.01"]
[Round "1"]
[White "CometB14"]
[Black "Crafty17.5.exe"]
[Result "0-1"]
[TimeControl "180"]
1. e4 g6 2. d4 Bg7 3. c4 d6 4. Nc3 Nf6 5. f3 Nbd7 6. Be3 e5 7. Be2 O-O 8.
d5 Nc5 9. Qd2 a6 10. O-O-O Bd7 11. Bxc5 dxc5 12. Kb1 Qe7 13. Nh3 Qd6 14.
Nf2 Rad8 15. g4 c6 16. h4 cxd5 17. exd5 b5 18. g5 b4 19. gxf6 bxc3 20. Qxc3
Bxf6 21. Ne4 Bf5 22. h5 g5 23. h6 Bxe4+ 24. fxe4 Rb8 25. Bh5 Rb4 26. Rdf1
Rb7 27. Qf3 Bd8 28. Qf5 a5 29. Rf2 a4 30. a3 Ra7 31. Rg2 Qf6 32. Qxf6 Bxf6
33. Rf1 Bd8 34. Rd2 Rb7 35. Bd1 Ra7 36. d6 f5 37. Rxf5 Rxf5 38. exf5 Kf7
39. Rd5 Ra6 40. Kc2 Kf6 41. Bg4 e4 42. Kd2 Rb6 43. Ke3 Rxb2 44. Kxe4 Rh2
45. Rxc5 Rxh6 46. Rc8 Rh4 47. Rxd8 Rxg4+ 48. Kd5 Rg3 49. d7 Ke7 50. Rh8
Rd3+ 51. Ke4 Rxd7 52. Rxh7+ Kd8 53. Kf3 ??
Kf6 Rxa3 57. Ke5 Rh3 58. f6 a3 59. c5 a2 60. Kd6 a1=Q 61. Ke6 Qe1+ 62. Kf5
Rf3+ 63. Kg6 Qg3+ 64. Kh5 Rf1 65. Kh6 Rh1#
{Black mates} 0-1

Unfortunately, I cannot reproduce this terrible move. But it is quite typical for permanent brain problems that you cannot reproduce these in general.
So, I will keep on testing permanent brain.
Thanks for the hint,
Uli


Rxh7 54. Kg4 Rh4+ 55. Kxg5 Rh3 56.