Author: Ernst Walet
Date: 09:20:37 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
Well, no problem for CM8K, could it be the case that you maybe use incomplete
sets of tablebases?
Ernst.
Time Depth Score Positions Moves
0:01 1/4 4.43 5420 1...Kg7 2. Qe7+ Kg6 3. d7 Qb7+
4. Kg3 Qc7+ 5. Kf3
0:02 1/6 4.51 40218 1...Kg7 2. Qe7+ Kg6 3. Qc7 Qb1
4. d7 Qe4+ 5. Kh2 Qd4
0:03 1/7 4.49 113685 1...Kg7 2. Qe7+ Kg6 3. d7 Qb7+
4. Kg3 Qc7+ 5. Kf3 Qc3+ 6. Kg2
Qc6+ 7. f3 Qc2+ 8. Kg3 Qc7+ 9. Kf2
0:04 1/8 4.48 235483 1...Kg7 2. Qe7+ Kg6 3. d7 Qb7+
4. Kg3 Qc7+ 5. Kf3 Qc3+ 6. Kg2
Qc6+ 7. f3 Qc2+ 8. Kg3 Qc7+ 9.
Kf2 Qb6+ 10. Ke2
0:09 1/9 4.48 621462 1...Kg7 2. Qe7+ Kg6 3. d7 Qb7+
4. Kf1 Qb1+ 5. Ke2 Qc2+ 6. Kf3
Qc3+ 7. Kg2 Qc6+ 8. f3 Qc2+ 9.
Kg3 Qc7+ 10. Kf2 Qb6+ 11. Ke2
0:30 1/10 4.31 2250265 1...Kg7 2. Qe7+ Kg6 3. d7 Qb7+
4. Kf1 Qb1+ 5. Ke2 Qc2+ 6. Kf3
Qc3+ 7. Kg2 Qc6+ 8. f3 Qc2+ 9.
Kg3 Qc7+ 10. Kf2 Qc2+ 11. Ke1 Qc3+
12. Ke2
2:03 2/11 4.20 9046550 1...Kg7 2. Qe7+ Kg6 3. d7 Qb7+
4. Kf1 Qb1+ 5. Ke2 Qc2+ 6. Kf3
Qc3+ 7. Kg2 Qc6+ 8. Kf1 Qb5+ 9.
Ke1 Qb1+ 10. Kd2 Qb2+ 11. Kd3 Qb3+
12. Kd4 Qd1+ 13. Kc5
6:40 3/12 6.95 29766104 1...Kg7 2. Qd7+ Kg6 3. h4 g4 4.
h5+ Kf6 5. Qe7+ Kf5 6. Qf7+ Ke5
7. d7 Qc6+ 8. Kg3 Qh1 9. f4+ gxf3
10. Qf4+ Ke6 11. d8=Q Qg2+ 12.
Kh4 Qh1+ 13. Kg4 Qg2+ 14. Qg3
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