Author: James Robertson
Date: 23:13:40 08/21/99
Today my program played against DiepBlue (Diep) on FICS. Diep achieved a won
position with a nice bishop sac after my program played the strange 21. ... Qd5?
(thinking it was winning a pawn). I thought for sure my program was dead, but
Diep played 51. Rxe5+? and left my program with only two knights for a 'drawn'
game. My program knows that two knights cannot checkmate, but it only checks for
this if there are no pawns on the board. It is sometimes funny to see it with
K+N vs K+P and refuse to capture the pawn! Anyway, it just happened to leave
DiepBlue with a rook pawn and..... by sheer luck it pushed Diep into the mate.
James
Here is the game: What other programs find Diep's excellent bishop sac? the time
control was 5 0, and Diep used about 5 seconds to find it. I haven't checked my
program, but it obviously thought it wasn't worth it when it played 21. ... Qd5?
My program used no book and played on my P233, 4MB hash.
[Event "ICS rated blitz match"]
[Site "freechess.org"]
[Date "1999.08.21"]
[Round "-"]
[White "DiepBlue"]
[Black "JRCP"]
[Result "0-1"]
[WhiteElo "2236"]
[BlackElo "2200"]
[TimeControl "300"]
1. c4 e5 2. Nc3 Nc6 3. g3 Nf6 4. Bg2 Bb4 5. Nd5 Ba5 6. Qa4 O-O 7. Rb1 Bb6
8. Nxb6 cxb6 9. d3 h6 10. Bd2 d5 11. cxd5 Nxd5 12. Nf3 Be6 13. Rc1 Rc8 14.
O-O Qd6 15. Rfd1 a6 16. Re1 Rfd8 17. Qh4 a5 18. a3 Nc7 19. a4 f6 20. Red1
b5 21. Re1 Qd5 22. Bxh6 gxh6 23. Qxh6 Rf8 24. Qg6+ Kh8 25. Ng5 Qd7 26. Qh6+
Kg8 27. axb5 Nxb5 28. Qg6+ Kh8 29. Qh5+ Kg8 30. Nxe6 Qxe6 31. Qg6+ Kh8 32.
Qh6+ Kg8 33. Rc5 Nc7 34. Qg6+ Kh8 35. Rc4 Nd4 36. Bxb7 Qg8 37. Qxg8+ Kxg8
38. b4 axb4 39. e3 Nde6 40. Bxc8 Rxc8 41. Rxb4 Nc5 42. Rd1 Nd5 43. Rc4 Nb6
44. Rcc1 Kf7 45. d4 Ne4 46. Rxc8 Nxc8 47. dxe5 fxe5 48. f3 Nc3 49. Rd3 Na4
50. Rd5 Ke6 51. Rxe5+ Kxe5 52. Kf2 Nd6 53. Ke2 Nc3+ 54. Kd3 Nd1 55. f4+ Kd5
56. Ke2 Nc3+ 57. Kf3 Kc4 58. g4 Nde4 59. f5 Nd2+ 60. Kf2 Kd3 61. f6 Nce4+
62. Kg2 Nxf6 63. g5 Nh5 64. Kf2 Ke4 65. h3 Nf3 66. g6 Nh4 67. Ke2 Nxg6 68.
Kf2 Nf6 69. Kg3 Ne7 70. Kg2 Nf5 71. Kf2 Nd5 72. Ke2 Nh4 73. Kd2 Nf3+ 74.
Kc2 Kxe3 75. Kb3 Kd3 76. Ka4 Nc3+ 77. Ka3 Nh4 78. Kb4 Kd4 79. Kb3 Ne4 80.
Kc2 Kc4 81. Kd1 Kc3 82. Ke2 Kd4 83. Ke1 Ke3 84. Kf1 Kd2 85. Kg1 Ke2 86. Kh2
Kf1 87. Kh1 Nf3 88. h4 Nf2#
{DiepBlue checkmated} 0-1
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