Author: Uri Blass
Date: 19:59:27 08/21/01
Go up one level in this thread
On August 21, 2001 at 13:52:01, Dieter Buerssner wrote:
>Two mates from an actual game postition with equal material on the board.
>The first one may not be difficult to find for playing programs. It is a
>mate in 9 or better.
>
>[D] r2q1r1k/1pbbn2B/p1n1p1p1/3p2NQ/1P1p1P2/P1P1B3/6PP/R4RK1 w - - 0 18
>
>The second one is mate in 19 or better. This positions occured 2 moves
>earlier in the game.
>
>[D] r2q1rk1/1pbbn1pp/p1n1p3/3p2N1/1P1p1P2/P1PBB3/6PP/R2Q1RK1 w - - 0 16
>
>Yace cannot find this mate, without help by first analysing some lines. When I
>then go back to the position, I get (with German notation, S=N, L=B, T=R, D=Q):
>
> 12.01 0:00 +M19 16.Lxh7+ Kh8 17.Dh5 Tf6 18.Lg6+ Kg8 19.Lf7+ Txf7 20.Dxf7+
>Kh8 21.Tf3 e5 22.Dh5+ Kg8 23.Dh7+ Kf8 24.fxe5+ Lf5 25.Dh8+ Sg8 26.Txf5+ Df6
>27.exf6 Lxh2+ 28.Kxh2 gxf6 29.Lf4 (548) 1.5
>
>The whole line is given as a variant in the PGN.
>
>[Event "Computer chess game 0 900 +5 0 0"]
>[Site "ICC"]
>[Date "2001.08.20"]
>[Round "20"]
>[White "Yace 0.99.55"]
>[Black "ChesterX"]
>[Result "1-0"]
>[WhiteElo "2625"]
>[BlackElo "2497"]
>[ECO "C17"]
>[Opening "French"]
>[Variation "Winawer, Advance, 5.a3"]
>[Timecontrol "0 900 +5 0 0"]
>[Time "Mon Aug 20 22:00:59 2001"]
>[last_book_move "11. c3"]
>[LogFile "logs\yace0608.log"]
>
>1. e4 {0s} e6 {1s} 2. d4 {0s} d5 {1s} 3. Nc3 {0s} Bb4 {2s} 4. e5 {0s} c5 {1s}
>5. a3 {0s} Ba5 {2s} 6. b4 {0s} cxd4 {1s} 7. Nb5 {0s} Bc7 {1s} 8. f4 {0s} Ne7
>{1s} 9. Nf3 {0s} Bd7 {1s} 10. Nbxd4 {0s} Nbc6 {1s} 11. c3 {0s} O-O {38s} 12.
>Bd3 {-0.09/10 49s} f6 {1s} 13. O-O {-0.10/9 68s} a6 {0s} 14. Be3 {0.01/8 57s}
>fxe5 {0s} 15. Ng5 {0.06/9 38s} exd4 {66s} 16. Bxh7+ {16.59/9 0s} Kh8 {1s} 17.
>Qh5 {20.76/9 23s} g6 {0s}
>(17...Rf6 18. Bg6+ Kg8 19. Bf7+ Rxf7 20. Qxf7+ Kh8 21. Rf3 e5 22. Qh5+
>Kg8 23. Qh7+ Kf8 24. fxe5+ Bf5 25. Qh8+ Ng8 26. Rxf5+ Qf6 27. exf6 Bxh2+
>28. Kxh2 gxf6 29. Bf4 Nce7 30. Qh5 Ng6 31. Qxg6 Ke7 32. Qg7+ Kd8 33. Rxd5+
>Ke8 34. Qf7#)
>18. Bxg6+ {+M09/9 32s} Kg7 {33s} 19. Qh7+
>{+M08/8 2s} Kf6 {32s} 20. g4 {+M07/9 4s} e5 {27s} 21. f5 {+M06/9 9s} dxe3
>{23s} 22. Ne4+ {+M05/9 1s} dxe4 {2s} 23. Qh4+ {+M04/7 0s} Kg7 {2s} 24. f6+
>{+M03/5 0s} Rxf6 {2s} 25. Qh7+ {+M02/4 0s} Kf8 {2s} 26. Rxf6# {+M01/4 0s}
>1-0 {ChesterX checkmated}
>
>With French Winawer, I have seen quite a few short computer chess games,
>also often, losses by Yace. But I have also seen fast wins for Black.
>Chester expected 15. fxe5. I think, 15. Ng5 is already winning, but Yace could
>not see it yet in the game. Actually, the two moves were rather close in score,
>which also shows, that there can be quite some luck involved.
>
>Regards,
>Dieter
Chessmaster needs only 7:35 on PIII850 to get a score of mate in 19 at depth
1/10.
It is clearly easier for chessmaster6000 than my mate in 18 problem.
The score is not changed at depthes 11 or 12
Uri
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