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Subject: Re: bug in Crafty, Ruffian, and Fritz?

Author: Uri Blass

Date: 09:41:23 09/04/03

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On September 04, 2003 at 12:12:50, Bill Doyle wrote:

>From the game Dreev-Glek on ICC today:
>
>[Event "Russian Championship"]
>[Site "Krasnoyarsk, Russia"]
>[Date "2003.09.04"]
>[Round "2"]
>[White "Dreev(GM)"]
>[Black "Glek(GM)"]
>[Result "1-0"]
>[WhiteElo "2698"]
>[BlackElo "2566"]
>[Opening "King's Indian: Sämisch, 5...O-O"]
>[ECO "E81"]
>[NIC "KI.52"]
>[Time "01:56:06"]
>[TimeControl "7200+0"]
>
>1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 6. Nge2 c5 7. d5 e6 8. Ng3
>exd5 9. cxd5 a6 10. a4 Ne8 11. Be3 f5 12. Qd2 Nd7 13. Be2 fxe4 14. Ngxe4
>Ndf6 15. Ng3 Rb8 16. O-O Nc7 17. Rab1 b5 18. axb5 axb5 19. b4 c4 20. f4 Bf5
>21. Nxf5 gxf5 22. Bf3 Re8 23. Bd4 Qd7 24. h3 Re7 25. Ra1 Ree8 26. Ra7 Qf7
>27. Re1 Rxe1+ 28. Qxe1 Re8 29. Qg3 Re7 30. Qg5 Qg6 31. Kf1 Qxg5 32. fxg5 Ne4
>33. Bxg7 Kxg7 34. Nxb5 Nxd5 35. Rxe7+ Nxe7 36. Bxe4 fxe4 37. Nxd6 c3 38. Ke2
>Nd5 39. b5 Kg6 40. Nxe4 Kf5 41. Nf6 Nf4+ 42. Kd1 Ke5 43. b6 Kd4 44. Ke1
>{White wins}
>1-0
>
>White most likely didn't play 44. Ke1?? which draws.
>
>Crafty, Ruffian, Fritz give 44. ... Nd3+ 45. Kd1 Nf4 =, when g3 wins.

g3 wins but Nf4 force a repetition and programs usually consider reptition
as a draw in their search.

It is not a bug but a design decision that make the search simpler without a
significant demage to playing strength.

Uri



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