Author: Dieter Buerssner
Date: 10:01:50 06/09/05
Go up one level in this thread
On June 08, 2005 at 16:37:51, Mihaly Szalai wrote:
>Hi Dieter,
>
>what is your opinion about this one?
>http://chessprogramming.org/cccsearch/ccc.php?art_id=317135
>
>[D]R7/P6p/4k2p/7P/8/8/4K3/r7 b - -
>
>
>1... Kf6! 2. Rf8+ Kg7! 3. a8=Q Re1+!
>
>When will an engine understand that this is a draw?
For a while, it looked, as if Yace could find a draw score. But then the score
failed low again. I fear, in this position there is "interference" by the hash
tables, which cannot handle 3 fold repetion correctly. Without HTs, there is no
way (for my engine at least) to reach enough depth.
Ra2+ and delaying Kf6 will work, too, yes?
4141151286 41:22.8 -8.40 23t 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Rd2+ 5.Kc4
Rc2+ 6.Kd4 Rd2+ 7.Kc5 Rc2+ 8.Kd6 Rd2+ 9.Kc7
Rc2+ 10.Kd7 Rd2+ 11.Kc6 Rc2+ 12.Kb5H Rb2+H
13.Ka6H Ra2+H 14.Kb7H Rb2+H 15.Kc8H Rc2+H
16.Qc6H Rxc6+H 17.Kd7H {HT}
11119275 43:06.0 -8.40 23. 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Rd2+ 5.Kc4
Rc2+ 6.Kd4 Rd2+ 7.Kc5 Rc2+ 8.Kd6 Rd2+ 9.Kc7
Rc2+ 10.Kd7 Rd2+ 11.Kc6 Rc2+ 12.Kb5 Rb2+ 13.Ka6
Ra2+ 14.Kb7 Rb2+ 15.Kc8 Rc2+ 16.Qc6 Rxc6+ 17.Kd7
2898642947 1:12:54 -8.00 24++ 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Rd2+ 5.Kc4
Rc2+ 6.Kd4 Rd2+ 7.Kc5 Rc2+ 8.Kd6 Rd2+ 9.Kc7
Rc2+ 10.Kd7 Rd2+ 11.Kc6 Rc2+ 12.Kb5 Rb2+ 13.Ka6
Ra2+ 14.Kb7 Rb2+ 15.Kc8 Rc2+ 16.Qc6 Rxc6+ 17.Kd7
233934700 1:29:35 -7.00 24++ 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Rd2+ 5.Kc4
Rc2+ 6.Kd4 Rd2+ 7.Kc5 Rc2+ 8.Kd6 Rd2+ 9.Kc7
Rc2+ 10.Kd8 Rd2+ 11.Kc8 Rc2+ 12.Qc6 Rxc6+ 13.Kd7
704650549 1:34:18 -2.00 24++ 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Rd2+ 5.Kc4
Rc2+ 6.Kd4 Rd2+ 7.Kc5 Rc2+ 8.Kd6 Rd2+ 9.Kc7
Rc2+ 10.Kd8 Rd2+ 11.Kc8 Rc2+ 12.Qc6 Rxc6+ 13.Kd7
763998325 1:34:55 -2.00 24t 1...Ra2+ 2.Kd3 Kf6 3.Rf8+H Kg7H 4.a8=QH Rd2+H
5.Kc4H Rc2+H 6.Kb5H Rb2+H 7.Ka6H Ra2+H 8.Kb7H
Rb2+H 9.Kc6H Rc2+H 10.Kb5H Rb2+H 11.Ka6H Ra2+H
12.Kb7H Rb2+H 13.Kc6H Rc2+H 14.Kb5HR {-921}
808222795 1:35:22 -2.00 24. 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Rd2+ 5.Kc4
Rc2+ 6.Kb5 Rb2+ 7.Ka6 Ra2+ 8.Kb7 Rb2+ 9.Kc6
Rc2+ 10.Kb5 Rb2+ 11.Ka6 Ra2+ 12.Kb7 Rb2+ 13.Kc6
Rc2+ 14.Kb5 {-921}
900998629 1:36:21 -2.40 25-- 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Rd2+ 5.Kc4
Rc2+ 6.Kb5 Rb2+ 7.Ka6 Ra2+ 8.Kb7 Rb2+ 9.Kc6
Rc2+ 10.Kd5 Rd2+ 11.Kc5 Rc2+ 12.Kd6 Rd2+ 13.Kc7
Rc2+ 14.Kd8 Kxf8
1502991928 1:42:42 -3.40 25-- 1...Ra2+ 2.Kf3 Kf6 3.Rf8+ Kg7 4.a8=Q Rf2+ 5.Ke4
Re2+ 6.Kd5 Re5+ 7.Kd6 Re6+ 8.Kd7 Re2 9.Rg8+ Kf6
1918063033 1:47:00 -3.41 25t 1...Ra2+ 2.Kf3 Kf6 3.Rf8+ Kg7H 4.a8=QH Rf2+H
5.Ke4H Re2+H 6.Kd5H Rd2+H 7.Kc6H Rc2+H 8.Kb6H
Rb2+H 9.Kc7H Rc2+H 10.Kd8H Rd2+H 11.Kc8H Rc2+H
12.Qc6H Rxc6+H 13.Kd7H {HT}
2074225016 1:48:39 -3.41 25. 1...Ra2+ 2.Kf3 Kf6 3.Rf8+ Kg7 4.a8=Q Rf2+ 5.Ke4
Re2+ 6.Kd5 Rd2+ 7.Kc6 Rc2+ 8.Kb6 Rb2+ 9.Kc7
Rc2+ 10.Kd8 Rd2+ 11.Kc8 Rc2+ 12.Qc6 Rxc6+ 13.Kd7
3156567014 1:59:47 -3.01 26++ 1...Ra2+ 2.Kf3 Kf6 3.Rf8+ Kg7 4.a8=Q Rf2+ 5.Ke4
Re2+ 6.Kd5 Rd2+ 7.Kc6 Rc2+ 8.Kb6 Rb2+ 9.Kc7
Rc2+ 10.Kd8 Rd2+ 11.Kc8 Rc2+ 12.Qc6 Rxc6+ 13.Kd7
3281609870 2:01:06 -3.01 26t 1...Ra2+ 2.Kf3 Kf6 3.Rd8H Rxa7H 4.Kg4H {HT}
3406835336 2:02:24 -3.01 26. 1...Ra2+ 2.Kf3 Kf6 3.Rd8 Rxa7 4.Kg4
350373797 2:15:13 -3.41 27-- 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Ra7
979948012 2:22:12 -4.41 27-- 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Ra7
3006953747 2:43:49 -4.43 27t 1...Ra2+ 2.Ke3 Kf6 3.Rf8+ Kg7H 4.a8=QH Re2+H
5.Kd4H Rd2+H 6.Ke4H Re2+H 7.Kd5H Rd2+H 8.Kc4H
Rc2+H 9.Kb5H Rb2+H 10.Ka6H Ra2+H 11.Kb7H Rb2+H
12.Kc8H Rc2+H 13.Qc6H Rxc6+H 14.Kd7H {80}
3448197551 2:48:48 -4.43 27. 1...Ra2+ 2.Ke3 Kf6 3.Rf8+ Kg7 4.a8=Q Re2+ 5.Kd4
Rd2+ 6.Ke4 Re2+ 7.Kd5 Rd2+ 8.Kc4 Rc2+ 9.Kb5
Rb2+ 10.Ka6 Ra2+ 11.Kb7 Rb2+ 12.Kc8 Rc2+ 13.Qc6
Rxc6+ 14.Kd7 {80}
1672115631 3:15:35 -4.03 28++ 1...Ra2+ 2.Ke3 Kf6 3.Rf8+ Kg7 4.a8=Q Re2+ 5.Kd4
Rd2+ 6.Ke4 Re2+ 7.Kd5 Rd2+ 8.Kc4 Rc2+ 9.Kb5
Rb2+ 10.Ka6 Ra2+ 11.Kb7 Rb2+ 12.Kc8 Rc2+ 13.Qc6
Rxc6+ 14.Kd7
3507733408 3:35:52 -4.83 28-- 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Ra7
26327396 3:45:20 -5.83 28-- 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Ra7
1831139439 4:04:53 -5.84 28t 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7H 4.a8=QH Rd2+H
5.Ke4H Re2+H 6.Kf4H Rf2+H 7.Ke5H Rxf8H 8.Qf3H
{HT}
2817373352 4:15:43 -5.84 28. 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Rd2+ 5.Ke4
Re2+ 6.Kf4 Rf2+ 7.Ke5 Rxf8 8.Qf3
3279929023 5:51:10 -5.55 29t 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Rd2+ 5.Ke4
Re2+ 6.Kd5 Rd2+ 7.Kc5 Rc2+ 8.Kd6 Rd2+ 9.Ke5
Re2+ 10.Kd4 Rd2+ 11.Kc4 Rc2+ 12.Kb5 Rb2+ 13.Kc6
Rc2+ 14.Kb6 Rb2+ 15.Ka7 Ra2+ 16.Kb7 Rb2+ 17.Kc8
Rc2+H 18.Kd8H Rd2+H 19.Qd5H Rxd5+H 20.Kc7H {HT}
878146049 6:11:48 -5.55 29. 1...Ra2+ 2.Kd3 Kf6 3.Rf8+ Kg7 4.a8=Q Rd2+ 5.Ke4
Re2+ 6.Kd5 Rd2+ 7.Kc5 Rc2+ 8.Kd6 Rd2+ 9.Ke5
Re2+ 10.Kd4 Rd2+ 11.Kc4 Rc2+ 12.Kb5 Rb2+ 13.Kc6
Rc2+ 14.Kb6 Rb2+ 15.Ka7 Ra2+ 16.Kb7 Rb2+ 17.Kc8
Rc2+ 18.Kd8 Rd2+ 19.Qd5 Rxd5+ 20.Kc7
Cheers,
Dieter
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