Author: Robert Hyatt
Date: 06:09:51 06/05/00
Go up one level in this thread
On June 05, 2000 at 08:22:44, Steffen Jakob wrote:
>Hi!
>
>This is a position from an interesting standard game MissSilicon - Hossa, played
>today at ICC:
>
>[D]5k2/7K/6P1/1p3p2/1P5P/1Pb5/8/8 w
I think there are times where you have to depend on your search. Normally
this is won by black, because black has a bishop to stop white's pawns. I
suspect that if you try to write special-purpose code to catch this, it will
end up being wrong more than it is right. This is a precise tempo-counting
issue that just barely lets the 'loser' win.
I'd likely just take the loss and run. It takes Crafty 9 plies (0 seconds
of course) to see that the bishop is not winning. I don't see an obvious
evaluation trick to make this show up faster...
>
>White is obviously winning. The static evaluation of this position of my program
>is totally wrong because Hossa thinks that the pawn f5 is running. Even after
>some improvements Hossa needs 8 plies to see a positive score!
>
> depth value time nodes pv
> 1 -6.07 0.00 3 1.g7 c3xg7
> 2/1 -3.62 0.00 6 1.h5 c3xb4
> <1> -3.62 0.00 7 1.h5 c3xb4
> 2 -3.62 0.00 24 1.h5 c3xb4
> <2> -3.62 0.00 40 1.h5 c3xb4
>! 3 -1.77 0.01 544 1.h5 f4 2.h6 c3xb4
>! <3> -1.77 0.01 551 1.h5 f4 2.h6 c3xb4
> 4 -1.87 0.03 1214 1.h5 f4 2.h6 f8e8 3.h7g8 c3xb4
> <4> -1.87 0.03 1245 1.h5 f4 2.h6 f8e8 3.h7g8 c3xb4
> 5 -1.67 0.05 2303 1.h5 c3g7 2.h6 g7xh6 3.h7xh6
> <5> -1.67 0.05 2375 1.h5 c3g7 2.h6 g7xh6 3.h7xh6
> 6 -1.81 0.09 4316 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f4
> <6> -1.81 0.09 4691 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f4
> 7 -1.81 0.20 9875 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f4
> <7> -1.81 0.21 10423 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f4
>! 8 0.76 0.61 31734 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f8g8
> 4.h6g5
>! <8> 0.76 0.61 31775 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f8g8
> 4.h6g5
>! 9 2.19 0.85 47414 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f8g8
> 4.h6g5 g8f8 5.g5xf5
>! <9> 2.19 0.85 47456 1.h5 c3g7 2.h6 g7xh6 3.h7xh6 f8g8
> 4.h6g5 g8f8 5.g5xf5
>
>
>Does your engine perform better here? Any ideas how to handle such positions?
>
>Best wishes,
>Steffen.
>
>P.S.: Here is the complete game score:
>
>[Event "ICC 30 20"]
>[Site "Internet Chess Club"]
>[Date "2000.06.05"]
>[Round "-"]
>[White "MissSilicon"]
>[Black "Hossa"]
>[Result "1-0"]
>[ICCResult "Black checkmated"]
>[WhiteElo "2437"]
>[BlackElo "2358"]
>[Opening "Bird's opening"]
>[ECO "A03"]
>[NIC "VO.07"]
>[Time "01:51:53"]
>[TimeControl "1800+20"]
>
>1. f4 d5 2. Nf3 Nf6 3. b3 d4 4. c3 c5 5. Qc2 Nc6 6. e3 Bd7 7. cxd4 cxd4 8.
>Nxd4 Nxd4 9. exd4 Bc6 10. Bb2 Rc8 11. Nc3 Qxd4 12. Nb5 Qb6 13. Bd4 Qd8 14.
>Qb2 Be4 15. Nxa7 Rc2 16. Bb5+ Nd7 17. Qb1 e5 18. O-O exd4 19. Re1 Qe7 20.
>Nc8 Qc5 21. Rxe4+ Kd8 22. b4 Qxc8 23. Rxd4 Rc7 24. Qb3 Be7 25. Re1 Bf6 26.
>Rde4 Rc1 27. Qxf7 Rxe1+ 28. Rxe1 Qc7 29. Kh1 Kc8 30. Bxd7+ Qxd7 31. Rc1+ Kd8
>32. Qh5 b6 33. d3 Re8 34. h3 Bb2 35. Rc4 Qxd3 36. Qb5 Qd6 37. Qf5 Qd7 38.
>Qxh7 Re1+ 39. Kh2 Bf6 40. Qc2 Bd4 41. Kg3 b5 42. Rc6 Re6 43. Rxe6 Qxe6 44.
>Kf3 Qe3+ 45. Kg4 Qc3 46. Qb1 Qd2 47. g3 Qe2+ 48. Kf5 Qf3 49. Qb3 Qxb3 50.
>axb3 Ke7 51. Kg6 Kf8 52. g4 Bf2 53. f5 Bh4 54. g5 Ke7 55. Kh5 Bg3 56. Kg6
>Be5 57. h4 Bc3 58. Kh7 Kf8 59. f6 gxf6 60. g6 f5 61. h5 Bg7 62. h6 Bc3 63.
>g7+ Kf7 64. g8=Q+ Ke7 65. Kg6 Bxb4 66. Qg7+ Ke6 67. h7 Be7 68. h8=Q Kd7 69.
>Qd4+ Kc7 70. Qc3+ Kb6 71. Qb8+ Ka6 72. Qa1+ Ba3 73. Qxa3# {Black checkmated}
>1-0
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