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Subject: Interesting test position

Author: Robert Hyatt

Date: 08:46:34 10/20/05

Here is the PGN for a blitz game Crafty played on ICC (ignore the pgn headers, I
fabricated them when annotating the game, I believe the game was a 5 0 blitz).

[Event "?"]
[Site "?"]
[Date "2005.10.18"]
[Round "?"]
[White "Crafty 20.1"]
[WhiteElo ""]
[Black "unknown"]
[BlackElo ""]
[Result "*"]

1. d4 Nf6 2. c4 e6 3. Nc3 Bb4 4. Bg5 c5 5. d5 h6 6. Bh4 Bxc3+
7. bxc3 d6 8. e3 e5 9. Bd3 e4 10. Bc2 Qe7 11. Bxf6 Qxf6 12. Ne2
Qe5 13. Qb1 Nd7 14. Bxe4 O-O 15. Bd3 Nf6 16. Qc2 a6 17. a4 Bg4
18. Rb1 b5 19. axb5 axb5 20. Rxb5 Bxe2 21. Kxe2 Rfe8 22. h3
Nh5 23. Kd2 Qg5 24. Rg1 Qf6 25. Rf1 Qe5 26. Rb7 Nf6 27. Rbb1
Qh2 28. Rg1 Nd7 29. Rbf1 Ne5 30. Ke2 Nxd3 31. Kxd3 Qe5 32. Kd2
Qf6 33. f4 Ra3 34. Re1 Qd8 35. Re2 Qa5 36. Rb1 Ra4 37. Kd3 f6
38. Rb5 Qa6 39. Qb3 Ra3 40. Qb2 Ra4 41. e4 Kh7 42. Qc2 Kg8 43. Qb3
Ra3 44. Qb2 Ra4 45. Qc2 Kh8 46. Qb3 Ra3 47. Qb2 Ra4 48. Qb3
Ra3 49. Qb2 Ra4 50. h4 h5 51. f5 Kh7 52. Qb1 Ra1 53. Rb6 Qa5
54. Qb3 Ra3 55. Rb5 Qa6 56. Qc2 Ra1 57. Rb1 Kh8 58. Ree1 Ra2
59. Qd1 Kg8 60. Qxh5 Ra8 61. Qg4 Ra4 62. e5 dxe5 63. Qe4 Ra3
64. Rb5 Qa4 65. d6 Ra2 66. Rc1 Rf2 67. Rxc5 Qa2 68. Qe1 Rd8
69. Ke3 Rxg2 70. Rd1 Rh2 71. Rd2 Rh3+ 72. Ke4 Qa8+ 73. Rdd5
Rxd6 74. Qb1 Rxd5 75. Rxd5 Qc8 76. Qb5 Rxh4+ 77. Ke3 Qxf5 78. Rd8+
Kh7 79. Qb3 Qf4+ 80. Kd3 Rh2 81. Rh8+ Kxh8 82. Qd1 e4+ 83. Kd4
Qd6+ 84. Ke3 Qxd1 85. Kxe4 Rf2 86. c5 *


The interesting stuff starts around move 65.  White played d6 with an eval of
+3.20.  Let your program search there to see what it likes.  The longer you
search, the more the score should drop.

If it doesn't follow the game another move and try again.  Crafty's scores
looked like this:

move 66:  +3.15, 67: +2.41, 68: +1.59, 69: +.62, 70: 0.00, 71: -.39, 72: 0.00,
73: 0.00, 74: -1.33, 75: -2.76, 76: -2.75, 77: -12.0, 78: -13.66, etc.

I first thought I had some sort of bug, but after playing back through the
position, this is less a bug and more just missing deep tactics.  Would be
interesting to see what kinds of scores at different depths other programs see
starting at move 66...

• Re: Interesting test position Dann Corbit 09:46:19 10/21/05
• Re: Interesting test position Paul Jacobean Sacral 19:03:08 10/20/05
• Re: Interesting test position Jarkko Pesonen 14:03:51 10/20/05
  • Mail problem Re: Interesting test position Ernest Bonnem 08:22:34 10/25/05
• Re: Interesting test position Dan Andersson 10:44:02 10/20/05
  • Re: Interesting test position Dan Andersson 10:51:05 10/20/05
• Re: Interesting test position Uri Blass 10:39:46 10/20/05
• Re: Interesting test position Richard Pijl 10:06:00 10/20/05
• Re: Interesting test position George Tsavdaris 09:58:07 10/20/05
  • Re: Interesting test position -> same remarks from Shredder9 NT Vincent Lejeune 10:12:43 10/20/05
• Re: Interesting test position John Merlino 09:44:55 10/20/05
  • Re: Interesting test position Robert Hyatt 20:30:00 10/21/05
• Re: Interesting test position joseph soney 09:02:41 10/20/05
• Re: Interesting test position Daniel Shawul 08:59:56 10/20/05
  • Re: Interesting test position Daniel Shawul 09:08:14 10/20/05

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