Author: James Robertson
Date: 11:25:40 10/15/98
Go up one level in this thread
On October 15, 1998 at 10:06:37, Robert Hyatt wrote:
>On October 14, 1998 at 22:27:11, James Robertson wrote:
>
>>On October 14, 1998 at 11:14:25, Djordje Vidanovic wrote:
>>
>>>I had Crafty 15_18 play a blitz match (4 min + 2 sec inc) against the 1.21
>>>Little Goliath update. In game 13 (ominous number?) of their match Crafty
>>>blundered away a clear win. The Crafty twilight zone started on move 75 and
>>>ended on move 77 after which the previously won position was a clear loss.
>>>Little Goliath garnered an undeserved win and I was left completely in the dark:
>>> hash-collision, tablebase problems??? Perhaps Bob Hyatt can help. Here's the
>>>game. (Endscore 15-5 for Crafty)
>>>PS: AMD-K6-II/300 128MB, 10 megs of hash for Crafty.
>>>
>>>Regards,
>>>Djordje
>>>
>>>
>>>[Event "Computer chess game"]
>>>[Site "HAL"]
>>>[Date "1998.10.13"]
>>>[Round "13"]
>>>[White "wcrafty-15_18"]
>>>[Black "lgol1_21.exe"]
>>>[Result "0-1"]
>>>[TimeControl "240+2"]
>>>
>>>1. e4 c6 2. d4 d5 3. Nd2 dxe4 4. Nxe4 Nd7 5. Ng5 Ngf6 6. Bd3 e6 7. Qe2 Bd6
>>>8. Bd2 Qb6 9. O-O-O Qxd4 10. Be3 Qa4 11. Kb1 h6 12. Bc4 Bc7 13. Bb3 Qa6 14.
>>>Qxa6 bxa6 15. N5h3 Bb6 16. Bf4 g5 17. Be3 Bxe3 18. fxe3 Ng4 19. Re1 Nde5
>>>20. Nf3 c5 21. Ba4+ Ke7 22. e4 Rb8 23. Re2 Nxf3 24. gxf3 Ne5 25. f4 gxf4
>>>26. Nxf4 Rd8 27. c3 Bd7 28. Bc2 Bc6 29. b3 c4 30. Ka1 Nd3 31. Rf1 Nxf4 32.
>>>Rxf4 cxb3 33. axb3 e5 34. Rf5 f6 35. Rg2 Rg8 36. Rgf2 Rg1+ 37. Kb2 Rg6 38.
>>>h4 Rf8 39. Rh5 a5 40. c4 Ke6 41. Kc3 Rd8 42. Rhf5 Rg3+ 43. Kb2 Rf8 44. Rh5
>>>Rg4 45. Rxh6 Bxe4 46. h5 Bxc2 47. Rxc2 Rh4 48. Rc1 Rh2+ 49. Rc2 Rh3 50. Rc3
>>>Rh4 51. Rc1 Rh2+ 52. Rc2 Rh3 53. Rc3 Rh1 54. Rd3 e4 55. Rd4 Rh4 56. Rh7
>>>Rh2+ 57. Ka3 f5 58. Rd5 f4 59. Rxa5 Rf6 60. Rc7 Rf8 61. Rc6+ Kd7 62. Rh6
>>>Ra8 63. Rd5+ Kc7 64. Rf5 Rd8 65. Rxf4 e3 66. Ra6 Rdd2 67. Rxa7+ Kd6 68. Rh7
>>>e2 69. Re4 Rd1 70. Rhe7 e1=Q 71. Rxe1 Rxe1 72. Rxe1 Rxh5 73. b4 Rh8 74.
>>>Rd1+ Kc6 75. b5+ Kc5 76. Rd5+ Kxc4 77. b6 Ra8+ 78. Ra5 Rxa5+ 79. Kb2 Rb5+
>>>80. Kc2 Rxb6 81. Kd2 Re6 82. Kc2 Re2+ 83. Kd1 Kd3 84. Kc1 Kc3 85. Kb1 Re1+
>>>86. Ka2
>>>{White resigns} 0-1
>>
>>I had Crafty play the position (before 75. Rd5+??) on my machine, and as
>>everyone would expect, it likes Rc1 from ply 1 all the way to play 14, when I
>>stopped.
>>
>>James
>
>
>With or without tablebases it realizes that 76. Rd5+ is a draw, instantly,
>leading me to suspect that this "bug" was caused by downloading tablebases
>and not unzipping them. That will cause *gross* behavior...
Yes..... I would hope most programs would find a draw after 76. Rd5+. I don't
have any tablebases, as my family would freak if I filled up half of the hard
drive with 2.5 gigs of tablebases....... :)
James
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