Author: Dieter Buerssner
Date: 17:01:08 04/07/04
Go up one level in this thread
On April 07, 2004 at 19:51:08, Uri Blass wrote:
>I think that it is obvious that pawn endgames should be searched deeper.
Yes, and Yace did it for a long time - but not that aggresively.
>I already suggested it a long time ago and I have ideas to generalize it and get
>rid of special extension for pawn endgame by simply searching deeper lines that
>are easy to search if the time of the search is small enough and when the time
>of the search is big enough(can be also in the middle of the search) to stop the
>search.
>
>The point is that Crafty failed to see the win in a reasonable time even some
>plies after trading the queens and the same for other programs so I think that
>access for W/D/L tables for KPP in the RAM is very important here.
No. It is not (only) because of the WDL tables. A search without any TB access
at all (I used a different version of Yace - the one I used in my first
experiment seems inferior - also in general - for reasons I did not understand
fully yet):
26671380 29.494 0.56 11. 1.Qd6+ Kf5 2.c6 Qe1 3.Qd7+ Kf6 4.Qh3 Qa5 5.Qc8
Qe1 6.Qd8+ Kf5 7.Qd3+ Ke6 8.Qc4+ Ke7 9.c7 Qg3+
10.Kg1 Qe1+ 11.Qf1 Qxf1+ 12.Kxf1 Kd7 13.c8=Q+
Kxc8 14.Ke2 f6 15.Kd3 Kd7 16.Kd4 f5 17.Ke5 g4
18.fxg4 f3 19.gxf3 fxg4 20.f4 Kc7 21.Ke4 Kd7
22.f5 Ke7 23.Kd4 Ke8 24.Kd5 Kd7 25.Kc5 Kc7
26.Kb4 Kd7 27.f6 Kc7 {0}
38483877 43.783 0.51 12t 1.Qd6+ Kf5 2.c6 Qe1 3.Qd7+ Kf6 4.Qh3 Qa5 5.Qc8
Qe1 6.Qg4 Qe7 7.Qh3 Qe2 {0}
43886853 49.496 0.52 12t+ 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 Kd5
5.Kxe3 Kxc5 6.Ke4 g4 7.fxg4 Kd6 8.g5 Ke7 9.g4
Kf8 10.Ke5 Kg7 11.Kf5 Kg8 12.Kf6 Kh7 13.g6+
fxg6 14.g5 Kg8 {0}
45438243 51.258 0.96 12++ 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 Kd5
5.Kxe3 g4 6.fxg4 Ke5 7.c6 Kd6 8.c7 Kxc7 9.Ke4
Kc8 10.g3 Kd8 11.Kd4 Ke8 12.Kd5 Kd7 13.Ke5 Ke7
14.Kf5 {80}
47090080 53.030 1.96 12++ 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 Kd5
5.Kxe3 Ke6 6.c6 Kd6 7.Ke4 Kxc6 8.Kf5 Kd7 9.Kxg5
Ke7 10.f4 Kf8 11.f5 Kg7 12.f6+ Kf8 13.Kf5 Ke8
14.g4 {80}
52188245 58.370 1.99 12t 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 Kd5
5.Kxe3 f6H 6.f4H g4H 7.c6H Kxc6H 8.Ke4H Kd6H
9.Kf5H Ke7H 10.Kxg4H Kf7H 11.Kf5H Kg7H 12.Ke6H
Kg6H 13.f5+H Kg7H 14.g4H {80}
56853762 1:03.3 1.99 12. 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 Kd5
5.Kxe3 f6 6.f4 g4 7.c6 Kxc6 8.Ke4 Kd6 9.Kf5 Ke7
10.Kxg4 Kf7 11.Kf5 Kg7 12.Ke6 Kg6 13.f5+ Kg7
14.g4 {80}
60951285 1:08.0 2.39 13++ 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 Kd5
5.Kxe3 Kc6 6.f4 gxf4+ 7.Kd4 f3 8.gxf3 Kc7 9.f4
Kc6 10.f5 Kc7 11.Kc4 Kc8 12.Kb5 Kd8 13.c6 Kc8
14.Kb6 Kb8 15.f6 Ka8H 16.Kc5H Kb8H 17.Kb6H Ka8H
18.Kc5H Kb8H 19.Kb6HR {80}
67606461 1:15.4 2.42 13t 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 Kd5
5.Kxe3 f5H 6.f4H g4H 7.c6H Kxc6H 8.Kd4H Kb6H
9.Ke5H Kc5H 10.Kxf5H Kd4H 11.Kxg4H Ke3H 12.g3H
Kd3H 13.Kg5H Kc3H 14.Kf6H Kb4H 15.Kg6H Kc5H
16.f5H Kc6H 17.f6H Kd6H 18.f7H Ke7H 19.f8=Q+H
Kxf8H 20.g4H Ke7H 21.Kg7H Ke6H 22.g5H Kd7H {HT}
{80}
81753199 1:31.7 2.42 13. 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 Kd5
5.Kxe3 f5 6.f4 g4 7.c6 Kxc6 8.Kd4 Kb6 9.Ke5 Kc5
10.Kxf5 Kd4 11.Kxg4 Ke3 12.g3 Kd3 13.Kg5 Kc3
14.Kf6 Kb4 15.Kg6 Kc5 16.f5 Kc6 17.f6 Kd6 18.f7
Ke7 19.f8=Q+ Kxf8 20.g4 Ke7 21.Kg7 Ke6 22.g5
Kd7 23.g6H Ke7H 24.Kh6H Kd7H 25.g7H Kd6H {HT}
{80}
90689657 1:41.3 2.82 14++ 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 f6 5.Kxe3
Kd7 6.g4 f5 7.gxf5 Kc7 8.f4 g4 9.f6 g3 10.f7
Kc8 11.f8=Q+ Kb7
103519541 1:54.6 3.50 14t 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 f5 5.Kxe3
Kd5 6.c6 Kxc6 7.f4 g4 8.Kd4 Kd6 9.g3 Ke6
10.Kc5H Kf6H 11.Kd6H Kf7H 12.Ke5H Kg6H 13.Ke6H
Kh6H 14.Kf6H Kh7H 15.Kxf5H Kg7H 16.Kxg4H Kh6H
17.Kf5H Kg7H 18.Kg5H Kf7H 19.g4H Kg8H 20.Kg6H
Kh8H 21.g5H Kg8H 22.f5H Kf8H 23.f6H Kg8H
24.f7+H Kf8H 25.Kh7H Ke7H {160}
133224326 2:29.5 3.50 14. 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 f5 5.Kxe3
Kd5 6.c6 Kxc6 7.f4 g4 8.Kd4 Kd6 9.g3 Ke6 10.Kc5
Kf6 11.Kd6 Kf7 12.Ke5 Kg6 13.Ke6 Kh6 14.Kf6 Kh7
15.Kxf5 Kg7 16.Kxg4 Kh6 17.Kf5 Kg7 18.Kg5 Kf7
19.g4 Kg8 20.Kg6 Kh8 21.g5 Kg8 22.f5 Kf8 23.f6
Kg8 24.f7+ Kf8 25.Kh7 Ke7 {160}
152760978 2:50.7 3.90 15++ 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 f5 5.Kxe3
Kd5 6.c6 Kxc6 7.f4 g4 8.Kd4 g3 9.Ke5 Kc7
10.Kxf5 Kd8 11.Kg4 Kc7 12.Kxg3 Kc6 13.Kh4 Kc5
14.g3 Kb4 15.g4 Kc5 16.g5 Kd5 17.g6H Ke6H
18.g7H Kf7H 19.Kh5H {HT} {160}
178196163 3:17.0 4.90 15++ 1.Qxe3 fxe3 2.Kg1 Kf6 3.Kf1 Ke6 4.Ke2 f5 5.Kxe3
Ke5 6.f4+ Kf6 7.fxg5+ Kxg5 8.c6 f4+ 9.Ke4 Kg6
10.c7 f3 11.c8=Q f2
Regards,
Dieter
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