Author: Dieter Buerssner
Date: 10:52:01 08/21/01
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
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