Author: Sune Larsson
Date: 15:11:42 03/02/01
Go up one level in this thread
On March 02, 2001 at 17:51:12, Dieter Buerssner wrote:
>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
1.Kd5 Qg8 2.Bb5 Kc7 3.Be8 Qh8 4.Bf7 Kb8 5.Kc6 Qg8 6.Kd7 Qh8 7.Ke8 Kc7 8.b8Q+
Kxb8 9.Kd8 Ka8 10.Kc8 Qg8 11.Kc7 Qxf7 12.gxf7 g5 13.Kd8 g4 14.Ke8 Bg7 15.Kxe7 g3
16.f8Q+ Bxf8+ 17.Kxf8 g2 18.e7 g1Q 19.e8Q# 1-0 Puh...;)
Sune
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.