Author: Robert Hyatt
Date: 18:18:35 03/17/01
Go up one level in this thread
On March 17, 2001 at 10:22:39, Dieter Buerssner wrote:
>On March 17, 2001 at 06:13:23, Christian Koch wrote:
>
>> 8/8/pq1PQ1kp/6p1/8/7P/5PK1/8 b - -
>>
>>This is the evaluation of Gandalf. Gandalf needs much time to see that he is
>>totally lost. Other programms only need seconds to see it.
>>I think Gandalfs endgame should be improved to play at a high level.
>
>I tried this position with Yace. Something strange happened:
>
> 51305 0.702 -0.40 5. 1...Kg7 2.Qe7+ Kg6 3.Qe8+ Kf6 4.Qe7+ Kg6 5.Qe8+
> Kf6 6.Qe7+ Kg6 {0}
> 111931 1.638 -0.80 6-- 1...Kg7 2.Qe7+ Kg8 3.d7 Qc6+ 4.Kg3 Qc7+ 5.Kg4
> Qc6 6.d8=Q+ Qe8 {-921}
> 137448 1.868 -7.64 6t 1...Kg7 2.Qe7+ Kg6 3.Qc7 Qb3 4.d7 g4 5.d8=Q
> Qxh3+ 6.Kg1 {-841}
> 150310 1.974 -7.64 6. 1...Kg7 2.Qe7+ Kg6 3.Qc7 Qb3 4.d7 g4 5.d8=Q
> Qxh3+ 6.Kg1 {-841}
>
>Here one could assume, that it really sees fast, that black is lost
>
> 186148 2.222 -7.75 7t 1...Kg7 2.Qe7+ Kg6 3.Qc7 Qb3 4.d7 g4 5.Qd6+ Kg7
> 6.Qe7+ Kg6 7.Qe4+H Kf7H 8.d8=QH Qxh3+H 9.Kg1H
> {-841}
> 191019 2.266 -7.75 7. 1...Kg7 2.Qe7+ Kg6 3.Qc7 Qb3 4.d7 g4 5.Qd6+ Kg7
> 6.Qe7+ Kg6 7.Qe4+ Kf7 8.d8=Q Qxh3+ 9.Kg1 {-841}
> 337668 3.199 -7.78 8t 1...Kg7 2.Qe7+ Kg6 3.Qc7 Qb3 4.d7 g4 5.Qd6+ Kf7
> 6.d8=Q Qxh3+ 7.Kg1 {-841}
> 505552 4.276 -7.78 8. 1...Kg7 2.Qe7+ Kg6 3.Qc7 Qb3 4.d7 g4 5.Qd6+ Kf7
> 6.d8=Q Qxh3+ 7.Kg1 {-841}
>
>And it kept about the same for another 2 plies. But now:
>
> 1666011 12.245 -7.38 9++ 1...Kg7 2.Qe7+ Kg6 3.Qc7 Qb3 4.d7 Qd5+ 5.Kh2
> Qd4 6.d8=R Qxf2+ 7.Kh1 {-340}
> 6934801 57.940 -0.40 9t 1...Kg7 2.Qd7+ Kg6 3.h4 {HT}
> 7368426 1:01.4 -0.40 9. 1...Kg7 2.Qd7+ Kg6 3.h4
>
>Huch: we are back at almost drawing score.
>
> 8889435 1:13.5 -0.80 10-- 1...Kg7 2.Qd7+ Kg6 3.h4 gxh4 4.Qe8+ Kh7 5.Qe7+
> Kg6 6.d7 Qc6+ 7.Kh2 Qc7+ 8.Kh3 h5 9.d8=Q a5
> {-841}
> 12883052 1:46.1 -1.68 10t 1...Kg7 2.Qd7+ Kg6 3.h4 gxh4 4.Qe8+ Kf6 5.d7
> Qc6+ 6.Kh2 Qc7+ 7.Kh3 Qc3+ 8.Kxh4 Qc4+ 9.Kg3
> Qc7+ 10.f4 Qc3+ 11.Kg4 {HT} {0}
> 13257667 1:48.9 -1.68 10. 1...Kg7 2.Qd7+ Kg6 3.h4 gxh4 4.Qe8+ Kf6 5.d7
> Qc6+ 6.Kh2 Qc7+ 7.Kh3 Qc3+ 8.Kxh4 Qc4+ 9.Kg3
> Qc7+ 10.f4 Qc3+ 11.Kg4 {HT} {0}
> 17090908 2:15.6 -2.08 11-- 1...Kg7 2.Qd7+ Kg6 3.h4 gxh4 4.Qe8+ Kf6 5.d7
> Qc6+ 6.Kh2 Qc7+ 7.Kh3 Qc3+ 8.Kxh4 Qc4+ 9.Kg3
> Qc7+ 10.f4 h5 11.d8=Q+ Kf5 {-921}
> 26447712 3:26.8 -6.50 11t 1...Kg7 2.Qd7+ Kg6 3.h4 Kh5 4.Qe8+ Kxh4 5.Qe3
> Qxe3 6.fxe3 a5 7.d7 a4 8.d8=Q a3 9.e4 {-841}
> 26573747 3:27.8 -6.50 11. 1...Kg7 2.Qd7+ Kg6 3.h4 Kh5 4.Qe8+ Kxh4 5.Qe3
> Qxe3 6.fxe3 a5 7.d7 a4 8.d8=Q a3 9.e4 {-841}
> 33767907 4:20.6 -6.90 12-- 1...Kg7 2.Qd7+ Kg6 3.h4 Kh5 4.Qe8+ Kxh4 5.Qe3
> Qxe3 6.fxe3 a5 7.d7 Kh5 8.d8=Q Kg6
>
>And after rather long time again at loosing score. I have not investigated the
>reasons, but perhaps this is more complicated for a chess program, than it looks
>at first sight.
>
>Regards,
>Dieter
I would suspect a bug. I ran this and crafty sees +8 instantly and hangs on to
that type of score forever. I just fixed a major bug in repetition code about
2 versions back, so bugs _can_ happen to anybody. :)
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