Author: Mike Byrne
Date: 07:59:20 05/16/04
Go up one level in this thread
On May 16, 2004 at 10:00:09, Uri Blass wrote:
>On May 16, 2004 at 09:07:25, Mike Byrne wrote:
>
>>On May 16, 2004 at 05:49:06, Jorge Pichard wrote:
>>
>>>[D]8/6k1/p7/1p6/PP6/8/K1P5/8 w - - 0 59
>>>
>>
>>
>>I wonder why it didn't see the mate in 18 after axb5.
>
>
>It is typical for programs with part of the tablebases to see longer mate.
>
>KPPP vs K has no practical value so probably 99% of the people do not use them
>
>Here is Crafty with part of the tablebases on P850.
>It can also see a longer mate and plans axb5 a5 and not axb5 axb5 and it takes
>it time to see that axb5 is best with a shorter mate.
>
>New game,
>8/6k1/p7/1p6/PP6/8/K1P5/8 w - - 0 1
>
>Analysis by Crafty 19.12:
>
>1.Kb3
> +- (1.83) Depth: 1/3 00:00:00
>1.Kb3 Kf6 2.axb5 axb5
> +- (1.68) Depth: 2/3 00:00:00
>1.axb5 axb5 2.Kb3
> +- (1.88) Depth: 2/3 00:00:00
>1.axb5 axb5 2.Kb3
> +- (2.28) Depth: 3/6 00:00:00
>1.axb5 axb5 2.Kb3
> +- (3.28) Depth: 3/6 00:00:00
>1.axb5 axb5 2.Kb3
> +- (5.28) Depth: 3/6 00:00:00
>1.axb5 a5 2.bxa5
> +- (11.64) Depth: 3/6 00:00:00
>1.axb5 a5 2.bxa5 Kf6
> +- (11.44) Depth: 4/6 00:00:00
>1.axb5 a5 2.bxa5 Kf6
> +- (11.84) Depth: 5/7 00:00:00
>1.axb5 Kf6 2.c4 a5 3.bxa5
> +- (11.86) Depth: 5/7 00:00:00
>1.axb5 a5 2.bxa5 Kf6 3.b6 Ke5
> +- (12.03) Depth: 6/8 00:00:00 2kN, tb=17
>1.axb5 a5 2.bxa5 Kf6 3.b6 Ke5
> +- (12.43) Depth: 7/9 00:00:00 3kN, tb=25
>1.axb5 a5 2.bxa5 Kf6 3.b6 Ke5
> +- (13.43) Depth: 7/9 00:00:00 4kN, tb=29
>1.axb5 Kf6 2.bxa6 Ke5 3.a7 Kd5 4.Kb3 Kd4 5.a8Q
> +- (13.63) Depth: 7/9 00:00:00 5kN, tb=30
>1.axb5 Kf6 2.bxa6 Ke5 3.a7 Kd5 4.Kb3 Ke4 5.a8Q+ Kd4
> +- (13.63) Depth: 8/11 00:00:00 7kN, tb=30
>1.axb5 Kf6 2.bxa6 Ke5 3.a7 Kd6 4.c4 Kc7 5.a8Q Kd6
> +- (13.92) Depth: 9/15 00:00:00 10kN, tb=78
>1.axb5 Kf6 2.bxa6 Ke5 3.a7 Kd5 4.Kb3 Kd4 5.c3+ Ke5 6.c4 Kd4 7.a8Q
> +- (14.09) Depth: 10/15 00:00:00 25kN, tb=86
>1.axb5 Kf6 2.bxa6 Ke5 3.a7 Kd5 4.Kb3 Kd4 5.c3+ Ke5 6.c4 Kd4 7.a8Q
> +- (14.49) Depth: 11/22 00:00:00 39kN, tb=270
>1.axb5 Kf6 2.bxa6 Ke5 3.a7 Kd6 4.c4 Kd7 5.b5 Kc7 6.a8Q
> +- (14.53) Depth: 11/22 00:00:00 103kN, tb=292
>1.axb5 Kf6 2.bxa6 Ke5 3.a7 Kd6 4.c4 Kd7 5.a8Q Kc7
> +- (14.61) Depth: 12/23 00:00:00 144kN, tb=344
>1.axb5 Kf6 2.bxa6 Ke5 3.a7 Kd6 4.c4 Kd7 5.a8Q Kc7
> +- (15.01) Depth: 13/24 00:00:01 160kN, tb=539
>1.axb5 Kf6 2.bxa6 Ke5 3.a7 Kd6 4.c4 Kd7 5.a8Q Kc7
> +- (16.01) Depth: 13/24 00:00:01 198kN, tb=562
>1.axb5 Kf6 2.bxa6 Ke5 3.a7 Kd6 4.c4 Kd7 5.a8Q Kc7
> +- (18.01) Depth: 13/24 00:00:01 204kN, tb=566
>1.axb5 a5 2.bxa5 Kf6 3.b6 Ke5 4.b7 Kd6 5.b8Q+ Kc5 6.Qd6+ Kc4 7.Qb4+ Kd5 8.c4+
>Kd4 9.c5+ Kd3 10.a6
> +- (20.31) Depth: 13/24 00:00:03 1225kN, tb=914
>1.axb5 a5 2.bxa5 Kf6 3.b6 Ke5 4.b7 Kd6 5.b8Q+ Kc5 6.Qd6+ Kc4 7.Qb4+ Kd5 8.c4+
>Kd4 9.c5+ Kd3 10.a6
> +- (20.71) Depth: 14/30 00:00:04 1629kN, tb=1093
>1.axb5 a5 2.b6 Kf6 3.b7 Ke5 4.b8Q+ Ke4 5.Qe8+ Kf3 6.Qe4+ Kg3 7.Qf4+ Kg2 8.Qf3+
>Kh2 9.bxa5 Kg1 10.a6 Kh2
> +- (20.72) Depth: 14/30 00:00:05 2475kN, tb=1304
>1.axb5 a5 2.b6 Kf6 3.b7 Ke5 4.b8Q+ Ke4 5.Qe8+ Kf3 6.Qe4+ Kg3 7.Qf4+ Kg2 8.Qf3+
>Kh2 9.bxa5 Kg1 10.a6 Kh2
> +- (21.12) Depth: 15/32 00:00:06 2908kN, tb=1937
>1.axb5 a5 2.b6 Kf6 3.b7 Ke5 4.b8Q+ Ke4 5.Qe8+ Kf3 6.Qe4+ Kg3 7.Qf4+ Kg2 8.Qf3+
>Kh2 9.bxa5 Kg1 10.a6 Kh2
> +- (22.12) Depth: 15/32 00:00:07 3102kN, tb=2030
>1.axb5 a5 2.b6 Kf6 3.b7 Ke5 4.b8Q+ Ke4 5.Qe8+ Kf3 6.Qe4+ Kg3 7.Qf4+ Kg2 8.Qf3+
>Kh2 9.bxa5 Kg1 10.a6 Kh2
> +- (24.12) Depth: 15/32 00:00:07 3111kN, tb=2030
>1.axb5 a5 2.b6 a4 3.b7 Kf6 4.b8Q Ke6 5.Qe5+ Kd7 6.Qd6+ Kc8 7.Qc7+ Kxc7
> +- (#24) Depth: 15/32 00:00:17 9069kN, tb=4364
>1.axb5 a5 2.b6 a4 3.b7 Kf6 4.b8Q Ke6 5.Qe5+ Kd7 6.b5 Kc8 7.Qc7+ Kxc7
> +- (#23) Depth: 16/34 00:00:21 11048kN, tb=5143
>1.axb5 a5 2.bxa5 Kf6 3.a6 Ke5 4.a7 Ke4 5.a8Q+ Ke3 6.Qe4+ Kf2 7.Qf3+ Ke1 8.Qe2+
>Kxe2
> +- (#19) Depth: 17/37 00:00:41 21520kN, tb=11667
>1.axb5 axb5
> +- (#18) Depth: 18/39 00:02:02 73157kN, tb=20288
>1.axb5 axb5
> +- (#18) Depth: 19/49 00:02:22 82764kN, tb=24931
>
>
>Uri
Crafty with the full 5 man set
White(1): 8/6k1/p7/1p6/PP6/8/K1P5/8 w - - 0 59
White(1): go
end-game phase
clearing hash tables
time surplus 0.00 time limit 166:39 (166:39)
depth time score variation (1)
5-> 0.12 Mat18 1. axb5 axb5 <EGTB>
6 0.12 Mat18 1. axb5 axb5 <EGTB>
6-> 0.12 Mat18 1. axb5 axb5 <EGTB>
7 0.17 Mat18 1. axb5 axb5 <EGTB>
7-> 0.17 Mat18 1. axb5 axb5 <EGTB>
8 0.20 Mat18 1. axb5 axb5 <EGTB>
8-> 0.47 Mat18 1. axb5 axb5 <EGTB>
9 0.47 Mat18 1. axb5 axb5 <EGTB>
9-> 0.47 Mat18 1. axb5 axb5 <EGTB>
10 0.48 Mat18 1. axb5 axb5 <EGTB>
10-> 0.86 Mat18 1. axb5 axb5 <EGTB>
11 0.86 Mat18 1. axb5 axb5 <EGTB>
11-> 0.98 Mat18 1. axb5 axb5 <EGTB>
12 0.98 Mat18 1. axb5 axb5 <EGTB>
12-> 1.16 Mat18 1. axb5 axb5 <EGTB>
13 1.16 Mat18 1. axb5 axb5 <EGTB>
13-> 1.50 Mat18 1. axb5 axb5 <EGTB>
14 1.50 Mat18 1. axb5 axb5 <EGTB>
? 14 1.50 2/9* 1. c4
White(1): ?
time=2.31 cpu=4% mat=1 n=39501 fh=97% nps=17K
ext-> chk=5203 cap=57 pp=101 1rep=96 mate=0
predicted=0 nodes=39501 evals=4857 50move=0
endgame tablebase-> probes=478 hits=478
SMP-> split=0 stop=0 data=0/128 cpu=0.11 elap=2.31
mate in 18 moves.
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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