Author: Robert Hyatt
Date: 12:03:09 09/04/03
Go up one level in this thread
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.
>
>The real drawing line is 44. ... Kd3 Ng4 c2 Nf2+ =
>
>The bug doesn't show up using fen entry into Crafty, only when using the full
>pgn game score.
This can happen in games where the humans repeated things for a second time,
just to save a little time and reach time control. That confuses the search
into thinking that a draw can't be avoided since if a move was best the last
time this position was reached, it will _still_ be best the third time around.
That's probably why having the game history changes things, as repetitions are
then seen. With FEN, there is no history and no previous repetitions to have to
work around.
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