Author: Dieter Buerssner
Date: 12:02:17 11/15/02
Go up one level in this thread
On November 14, 2002 at 22:09:42, martin fierz wrote:
>i was looking at eduard nemeth's page on computer chess and stumbled across the
>following famous position:
>
>1k6/8/8/8/8/5p1p/PPP5/6K1 w - - 0 1
My current version of Yace on P4, 2.53 GHz needs 10 seconds to show a negative
score, and soon shows a clear winning score for black:
6361367 6.455 1.78 20. 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.b6 Ka8 12.Kf1 {0}
6937788 7.055 1.38 21-- 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.a7 Kxa7 10.Kf2
h2 11.Kxf3 h1=Q+ 12.Ke2
7813255 7.989 0.38 21-- 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.Kf2 h2 10.a7
h1=Q 11.a8=N+ Kxb5 12.c7H {HT}
9732305 10.018 -1.38 21t 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.b6 Ka8H 12.b7+H Kxa7H 13.Kf2H {-80}
12494238 12.862 -1.38 21. 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.b6 Ka8 12.b7+ Kxa7 13.Kf2 {-80}
13892629 14.304 -1.78 22-- 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.Kf2 h2 12.a8=R h1=Q 13.b6 {-501}
15008597 15.426 -1.97 22t 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.a8=Q+ Kxa8 12.b6 Kb7H 13.Kf2H {-80}
17219411 17.670 -1.97 22. 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.a8=Q+ Kxa8 12.b6 Kb7 13.Kf2 {-80}
18413005 18.945 -2.37 23-- 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.Kh2 f2 8.Kg3 f1=Q 9.c5+ Kxc5 10.a7
h2 11.a8=R
19220374 19.769 -3.37 23-- 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.Kh2 f2 8.Kg3 f1=Q 9.c5+ Kxc5 10.a7
h2 11.a8=R
23381560 24.063 -6.31 23t 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.b6 Ka8 12.Kf2 h2 13.Kxf3 h1=Q+H 14.Kf4H
{-841}
28849741 29.803 -6.31 23. 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.b6 Ka8 12.Kf2 h2 13.Kxf3 h1=Q+ 14.Kf4
{-841}
32846413 34.132 -6.71 24-- 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.Kf2 h2 12.b6 h1=Q 13.Ke3
40851616 42.436 -7.71 24-- 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.Kf2 h2 12.Ke3 h1=Q 13.b6 f2 14.Ke2
56485620 58.711 -8.04 24t 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.b6 Ka8 12.Kf2 h2 13.Kxf3 h1=Q+ 14.Kf4
Qb1 15.Ke5 Qxb6 {-921}
79095810 1:22.2 -8.04 24. 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.b6 Ka8 12.Kf2 h2 13.Kxf3 h1=Q+ 14.Kf4
Qb1 15.Ke5 Qxb6 {-921}
97036602 1:41.1 -8.40 25t 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.a7 Kxa7 10.c7
Kb7 11.b6 Kc8 12.Kf2 h2H 13.Kxf3H h1=Q+H
14.Ke2H Qc6H 15.Kd2H Qd6+H 16.Ke1H {HT} {-841}
121328233 2:07.4 -8.40 25. 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.a7 Kxa7 10.c7
Kb7 11.b6 Kc8 12.Kf2 h2 13.Kxf3 h1=Q+ 14.Ke2
Qc6 15.Kd2 Qd6+ 16.Ke1 {HT} {-841}
137454247 2:25.6 -8.80 26-- 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.a7 Kxa7 10.Kf2
h2 11.Ke3 Kb6 12.Kd3 f2 13.c7 f1=Q+ 14.Kd4 h1=Q
15.c8=Q Qxb5 16.Kc3 {-1001}
151571368 2:41.2 -9.80 26-- 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.a7 Kxa7 10.Kf2
h2 11.Ke3 Kb6 12.Kd3 f2 13.c7 f1=Q+ 14.Kd2 h1=Q
15.c8=Q Qxb5 16.Qc3 Qe4 {-1001}
165388828 2:57.5 -14.80 26-- 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.a7 Kxa7 10.Kf2
h2 11.Ke3 Kb6 12.Kd3 f2 13.Kc2 h1=Q 14.c7 f1=Q
15.c8=R Kxb5 16.Kb2 Qff3 {-1502}
228878161 4:08.5 -18.38 26t 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.b6 Ka8 12.Kf2 h2 13.Ke3 f2 14.Kd3 h1=Q
15.Kd4 f1=Q 16.Ke5 Qb5+ 17.Kd6 {-1842}
388671873 7:04.7 -18.38 26. 1.a4 Kb7 2.b4 Kb6 3.a5+ Ka6 4.c4 Ka7 5.b5 Kb7
6.a6+ Kb6 7.c5+ Ka7 8.c6 Kb6 9.c7 Kxc7 10.a7
Kb7 11.b6 Ka8 12.Kf2 h2 13.Ke3 f2 14.Kd3 h1=Q
15.Kd4 f1=Q 16.Ke5 Qb5+ 17.Kd6 {-1842}
With some interactive analysis, I can prove, that white gets mated in 27 (or
probably earlier). Unfortunately, the PVs are hidden in the transposition
tables.
6939210 7.998 -20.02 13. 1.Kf2 h2 2.c4 h1=Q 3.c5 Qh4+ 4.Ke3 f2 5.c6 f1=Q
6.c7+ Kxc7 7.Kd2 Qd4+ 8.Kc2 Qxb2+ 9.Kxb2 {-921}
7798170 8.983 -20.42 14-- 1.Kf2 h2 2.c4 h1=Q 3.a4 Qh4+ 4.Ke3 f2 5.Kd2
f1=Q 6.Kc3 Qhxc4+ 7.Kd2
7827717 9.015 -21.42 14-- 1.Kf2 h2 2.c4 h1=Q 3.a4 Qh4+ 4.Kg1
8135133 9.384 -Mat33 14-- 1.Kf2 h2 2.Kg3 h1=Q 3.Kf2 {-841}
23031154 26.347 -Mat18 14t 1.Kf2 h2 2.a4 h1=Q 3.b3 Qh4+H 4.Ke3H f2H 5.Ke2H
Qh3H 6.Kxf2H {-761}
23031162 26.347 -Mat26 14t+ 1.a4 Ka7 2.c3 Ka6H 3.c4H Kb7H 4.a5H Ka6H {HT}
{80}
23031170 26.347 -Mat26 14t 1.a4 Ka7 2.c3 Ka6H 3.c4H Kb7H 4.a5H Ka6H {HT}
{80}
23031178 26.348 -Mat27 14t+ 1.a3 Kc7 2.a4 Kb6H 3.c3H Ka6H 4.c4H Kb7H 5.a5H
Ka6H {HT} {80}
23031186 26.348 -Mat27 14t 1.a3 Kc7 2.a4 Kb6H 3.c3H Ka6H 4.c4H Kb7H 5.a5H
Ka6H {HT} {80}
23369314 26.744 -Mat27 14. 1.a3 Kc7 2.a4 Kb6 3.c3 Ka6 4.c4 Kb7 5.a5 Ka6
{HT} {80}
And does not change anymore for some while. The transposition tables were
preoccupied by some useful values.
Regards,
Dieter
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