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Subject: Interesting comp vs comp position

Author: Robert Hyatt

Date: 12:21:17 07/15/03

Here is a position reached in a game on ICC between Crafty and an
unnamed opponent:

[D]8/2k2p2/7p/ppPK4/6P1/P6P/8/8 w 0 1

Crafty was black, and expecting Ke4 with a draw score.  White for
reasons unknown tried c6 advancing the passer, but this fails
miserably to black's b4.  After white played c6, crafty's eval
instantly started climbing and hit +9 after a 16 ply search in
about 5 seconds:

               14     0.38  -0.93   61. ... b4 62. axb4 axb4 63. Kc4 Kxc6
                                    64. Kxb4 Kd5 65. Kc3 Ke4 66. Kd2 Kf3
                                    67. Ke1 Kg3 68. Ke2 Kxh3 (s=2)
               14->   0.49  -0.93   61. ... b4 62. axb4 axb4 63. Kc4 Kxc6
                                    64. Kxb4 Kd5 65. Kc3 Ke4 66. Kd2 Kf3
                                    67. Ke1 Kg3 68. Ke2 Kxh3 (s=2)
               15     0.76  -0.96   61. ... b4 62. axb4 axb4 63. Kc4 Kxc6
                                    64. Kxb4 Kd5 65. Kc3 Ke4 66. Kd2 Kf3
                                    67. Ke1 f6 68. Kf1 Kg3 69. Ke2 Kxh3
               15->   1.04  -0.96   61. ... b4 62. axb4 axb4 63. Kc4 Kxc6
                                    64. Kxb4 Kd5 65. Kc3 Ke4 66. Kd2 Kf3
                                    67. Ke1 f6 68. Kf1 Kg3 69. Ke2 Kxh3
                                    (s=3)
               16     1.24     ++   61. ... b4!!
               16     4.83  -8.81   61. ... b4 62. axb4 axb4 63. Kc4 Kxc6
                                    64. h4 b3 65. Kc3 Kd5 66. Kb2 Ke4 67.
                                    g5 hxg5 68. h5 Kf5 69. h6 Kg6 70. Kxb3
                                    (s=2)
               16->   5.38  -8.81   61. ... b4 62. axb4 axb4 63. Kc4 Kxc6
                                    64. h4 b3 65. Kc3 Kd5 66. Kb2 Ke4 67.
                                    g5 hxg5 68. h5 Kf5 69. h6 Kg6 70. Kxb3

after the next move it was a mate in 26 for black.

This seems like a simple "distant passed pawn" idea where black's king isss
closer to the remaining pawns after the queen-side pawns are all gone.  I'd
hope not many would play c6 and lost instantly, but at least one commercial
engine does.  Goes to show that _anything_ can happen in a comp vs comp
game of chess.  :)

This was a 5 3 game, for the record:

[Event "?"]
[Site "?"]
[Date "2003.07.15"]
[Round "?"]
[White "ICC opponent"]
[WhiteElo ""]
[Black "Crafty 19.4"]
[BlackElo ""]
[Result "0-1"]

1. d4 Nf6 2. Bg5 d5 3. Bxf6 gxf6 4. Nf3 c5 5. dxc5 e6 6. c4
Bxc5 7. e3 Nc6 8. cxd5 Qxd5 9. Qxd5 exd5 10. Nc3 Be6 11. Bb5
O-O 12. O-O-O Rac8 13. Nxd5 Bxd5 14. Rxd5 Bxe3+ 15. Kb1 Bxf2
16. Rf1 Bb6 17. Nd2 Nb4 18. Rd7 Rfd8 19. Ne4 Rxd7 20. Nxf6+
Kg7 21. Nxd7 Be3 22. Ba4 Nd5 23. Bb3 Rc7 24. Ne5 Nf6 25. h3
Bd4 26. Nf3 Bc5 27. Re1 Bb4 28. Re5 Bd6 29. Rg5+ Kf8 30. Rf5
Kg7 31. g4 Bg3 32. Rg5+ Kf8 33. Ra5 a6 34. Rf5 Kg7 35. Rg5+
Kf8 36. a3 Ne4 37. Rh5 Kg7 38. Bc2 Nf6 39. Rg5+ Kf8 40. Rf5
Kg7 41. Nd4 Rd7 42. Ne2 Bh4 43. Nf4 h6 44. Nd3 Re7 45. Re5 Rc7
46. Bb3 Bg3 47. Rf5 Bd6 48. Bd5 Nxd5 49. Rxd5 Rc6 50. Ka2 Kf6
51. b4 b5 52. Kb3 Ke7 53. Nc5 Bxc5 54. bxc5 Re6 55. Kc3 Re4
56. Rd4 Rxd4 57. Kxd4 Ke6 58. Ke4 a5 59. Kd4 Kd7 60. Kd5 Kc7
61. c6 b4 62. axb4 axb4 63. Kc4 Kxc6 64. h4 b3 65. Kxb3 Kd5
66. g5 hxg5 67. hxg5 Ke4 68. Kc4 Kf4 69. Kd4 Kxg5 70. Ke3 Kg4
71. Kf2 f6 72. Ke3 f5 73. Kf2 Kf4 74. Ke2 Kg3 75. Ke1 Kg2 76. Kd2
f4 77. Kc3 f3 78. Kd4 f2 79. Kd5 f1=Q 80. Ke5 Kf3 81. Kd5 Qc1
82. Kd4 Qc6 83. Ke5 Qd7 84. Kf6 Kf4 85. Kg6 Qe7 86. Kh6 Kf5
87. Kh5 Qh7# 0-1

• Re: Interesting comp vs comp position Peter Skinner 19:05:59 07/15/03
  • Re: Interesting comp vs comp position Robert Hyatt 20:18:36 07/15/03
    • Re: Interesting comp vs comp position Peter Skinner 21:44:51 07/15/03
    • Re: Interesting comp vs comp position Omid David Tabibi 21:21:23 07/15/03
      • Re: Interesting comp vs comp position Uri Blass 21:55:47 07/15/03
• Re: Interesting comp vs comp position Eran 17:55:22 07/15/03
  • Re: Interesting comp vs comp position Robert Hyatt 20:13:57 07/15/03
• Re: Interesting comp vs comp position : Chess Tiger is the guilty one! Peter Skinner 15:27:08 07/15/03
  • Re: Interesting comp vs comp position : Chess Tiger is the guilty one! George Tsavdaris 15:49:43 07/15/03
    • Re: Interesting comp vs comp position : Chess Tiger is the guilty one! Peter Skinner 15:54:33 07/15/03
  • Re: Interesting comp vs comp position : Chess Tiger after 15:50 Peter Skinner 15:48:07 07/15/03
    • Re: Interesting comp vs comp position : Chess Tiger after 15:50 Robin Smith 15:28:26 07/16/03
      • Re: Interesting comp vs comp position : Chess Tiger after 15:50 Peter Skinner 16:01:18 07/16/03
• Re: Interesting comp vs comp position Peter Skinner 15:22:41 07/15/03
  • Re: Interesting comp vs comp position: Correct position for Deep Sjeng Peter Skinner 15:27:43 07/15/03
• Re: Interesting comp vs comp position George Tsavdaris 13:07:44 07/15/03
  • Re: Interesting comp vs comp position Kurt Utzinger 14:47:23 07/15/03
    • Re: Interesting comp vs comp position George Tsavdaris 15:24:13 07/15/03
      • Re: Interesting comp vs comp position (indeed strange) Kurt Utzinger 22:14:41 07/15/03
  • Re: Interesting comp vs comp position Michael P. Nance Sr. 13:37:18 07/15/03
    • Re: Interesting comp vs comp position Matthew White 13:43:52 07/15/03
      • Re: Interesting comp vs comp position Robert Hyatt 16:57:28 07/15/03
        • Re: Interesting comp vs comp position Robert Hyatt 16:58:02 07/15/03
• Re: Interesting comp vs comp position Kurt Utzinger 12:55:05 07/15/03
  • Re: Interesting comp vs comp position Robert Hyatt 17:02:54 07/15/03

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