Author: Dieter Buerssner
Date: 14:51:12 03/02/01
Go up one level in this thread
On March 02, 2001 at 14:39:10, Sune Larsson wrote:
> 1k3b1q/pP2p1p1/P1K1P1Pp/7P/2B5/8/8/8 w - - 0 1
>
> Horwitz,B 1885
>
> This one might prove as mission impossible. Black is totally paralysed
> from start and white is winning - but how?? Maybe more amusing for
> humans than for silicons. One could characterize black's position
> as slightly passive ;) but how could white make progress. Looks hard...
>
> Test: Win it! Draw scores like 0.00 are not trusted...
Nullmove seems not to be a good idea for this one - so I disabled nullmove in
Yace. While Yace does some Zugzwang safeguards for nullmove, it seems, that the
depth needed to find the solution with nullmoves turned on would be too high.
I also get strange fail highs and fail lows. Perhaps one reason is, that I
cannot detect stalemate inside quiescence search.
Unfortunately the sad truth is, that after showing a positive score for white,
it will fall back to zero again. Nevertheless, doing some moves on the board,
and it will see the win, more or less like Uri described, including the sac of
the b-pawn. No refutation can be found, after taking back moves.
329720 2.745 0.05 13t 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Ke5
Kc7 6.Ke4 Kb6 7.b8=Q+ Kxa6 {-80}
374756 3.048 0.05 13. 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Ke5
Kc7 6.Ke4 Kb6 7.b8=Q+ Kxa6 {-80}
384002 3.125 0.45 14++ 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Kd4
Qg8 6.Bxg8 Kc7 7.b8=Q+ Kxb8 8.Kd5 {0}
527928 4.144 1.64 14t 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Kc6
Qg8 6.Kd7 Qxf7 7.gxf7 g5 8.hxg6 {-190}
598849 4.624 1.64 14. 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Kc6
Qg8 6.Kd7 Qxf7 7.gxf7 g5 8.hxg6 {-190}
713199 5.379 1.31 15t 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Kc6
Qg8 6.Kd7 Qxf7 7.gxf7 g5 8.hxg6 h5 {-190}
732294 5.533 1.31 15. 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Kc6
Qg8 6.Kd7 Qxf7 7.gxf7 g5 8.hxg6 h5 {-190}
918268 6.714 0.88 16-- 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Ke5 Kc7 5.Kf5
Qh8 6.Kf4 Qg8 7.Bf7 Qxf7+ 8.gxf7 Kb8 9.Kf5 Kc7H
10.Kg6H {-270}
1087929 7.907 0.00 16t 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Ke5 Kc7 5.Kf5
Qh8 6.Kf4 Qg8 7.Bf7 Qh8 8.Be8 {-921}
1120061 8.144 0.00 16. 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Ke5 Kc7 5.Kf5
Qh8 6.Kf4 Qg8 7.Bf7 Qh8 8.Be8 {-921}
1201151 8.723 0.40 17++ 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qxf7 5.gxf7
g5 6.hxg6 h5 7.Ke5 Bh6 8.Kf5 h4 9.g7 Bxg7
10.Ke4 {-270}
1666675 11.724 1.71 17t 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qxf7 5.gxf7
Kc7 6.Kc5 Kb8 7.Kc6 g5 8.hxg6 h5 9.Kd5 h4 {-190}
1849125 12.977 1.71 17. 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qxf7 5.gxf7
Kc7 6.Kc5 Kb8 7.Kc6 g5 8.hxg6 h5 9.Kd5 h4 {-190}
3203433 21.671 1.31 18-- 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Ke4 Qxe6+ 5.Kf4
Kc7 6.Kf3 Kb8 7.Kg3 Qxg6+ 8.Bxg6 e6 9.Bh7 Kc7
10.b8=N {180}
5284937 34.607 1.73 18t 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Kc6
Qg8 6.Kd7 Qh8 7.Kd8 Qg8 8.Ke8 Qh8 9.Kd7 Qg8
10.Bxg8 {80}
5923411 38.917 1.73 18. 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Kc6
Qg8 6.Kd7 Qh8 7.Kd8 Qg8 8.Ke8 Qh8 9.Kd7 Qg8
10.Bxg8 {80}
10519658 1:09.6 1.73 19t 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Kc6
Qg8 6.Kd7 Qh8 7.Kd8 Qg8 8.Ke8 Qh8 9.Kd7 Qg8
10.Bxg8 {80}
15398034 1:43.3 1.73 19. 1.Kd5 Kc7 2.Bb5 Qg8 3.Be8 Kb8 4.Bf7 Qh8 5.Kc6
Qg8 6.Kd7 Qh8 7.Kd8 Qg8 8.Ke8 Qh8 9.Kd7 Qg8
10.Bxg8 {80}
-- Dieter
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