Author: Christophe Theron
Date: 16:05:04 01/30/04
Go up one level in this thread
On January 30, 2004 at 18:35:50, Ed Trice wrote:
>Hi Kurt,
>
>Just think with the King + 2 pawn vs. King + 2 pawn 6 piece tablebased probed
>in RAM, this would be solved with a 4-ply search, maybe even sooner because of
>check/capture extensions!
Actually a 1 ply search of Chess Tiger (and most other programs) would solve it.
Christophe
>
>>The position below is from a 90m+30s game between
>>Shredder8 and ChessTiger15 in which White easily
>>won with 45.Qf6 and an won pawn ending. Interesting
>>to see that many engines do not find the winning
>>move within reasonalbe time, i.e. Chess Tiger 15
>>whereas it's no problem for Chess Tiger 14.
>>Kurt
>>
>>[D]8/4Q3/p5k1/1p2P3/5q2/P2K4/1P6/8 w - - 0 46
>>
>>
>>Shredder 8 - Chess Tiger 15.0
>>8/6k1/p3Q3/1p2P3/5q2/P2K4/1P6/8 w - - 0 1
>>
>>Analysis by Chess Tiger 14.0:
>>
>>45.Qd7+ Kg6 46.Qc6+ Kg5 47.e6 Qf1+ 48.Kd2 Qf4+ 49.Kc2 Qf5+ 50.Kc3
>> +- (1.52) Depth: 7 00:00:00 179kN
>>45.Qd7+ Kg6 46.Qd6+ Kh5 47.b3 Qg3+ 48.Kd4 Qxb3 49.Qxa6 Qc4+ 50.Ke3
>> ± (1.40) Depth: 7 00:00:00 297kN
>>45.Qd7+ Kg6 46.Qd6+ Kg5 47.Qd8+ Kh5 48.Qd5 Kg5 49.b3 Qf1+ 50.Kd2
>> ± (1.34) Depth: 8 00:00:01 670kN
>>45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qxb2 49.Qd7+ Kf8 50.Qd6+ Ke8 51.Qxa6
>> ± (1.40) Depth: 8 00:00:02 769kN
>>45.Qe7+ Kg6 46.b3 Qg3+ 47.Kd4 Qf4+ 48.Kc5 Qe3+ 49.Kd6 Qd3+ 50.Kc7 Qxb3 51.Qf6+
>>Kh5 52.Qxa6
>> +- (1.44) Depth: 8 00:00:02 989kN
>>45.Qe7+ Kg6 46.b3 Qg3+ 47.Kd4 Qf4+ 48.Kc5 Qe3+ 49.Kd6 Qd3+ 50.Kc7 Qxb3 51.Qf6+
>>Kh5 52.Qxa6
>> +- (1.44) Depth: 9 00:00:03 1316kN
>>45.Qe7+ Kg6 46.b3 Qg3+ 47.Kd4 Qxb3 48.Qf6+ Kh5 49.Qxa6 Qc4+ 50.Ke3 Qc3+ 51.Ke4
>>Qc4+ 52.Kf3 Qc3+ 53.Kf4
>> ± (1.38) Depth: 10 00:00:07 2750kN
>>45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc4 51.Ka5
>> +- (1.42) Depth: 10 00:00:08 3482kN
>>45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc4 51.Ka5
>> +- (1.42) Depth: 11 00:00:10 4045kN, tb=3
>>45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc5 51.b4+
>>Kc4 52.Ka5
>> +- (1.44) Depth: 12 00:00:16 6530kN, tb=21
>>45.Qf6+
>> +- (2.34) Depth: 13 00:00:23 9597kN, tb=80
>>45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc5 51.b4+
>>Kc4 52.Ka5 Kb3 53.Kxb5 Kxa3
>> +- (7.20) Depth: 13 00:00:23 9607kN, tb=128
>>45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc5 51.b4+
>>Kc4 52.Ka5 Kb3 53.Kxb5 Kxa3
>> +- (7.16) Depth: 14 00:00:26 11049kN, tb=258
>>45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc5 51.b4+
>>Kc4 52.Ka5 Kb3 53.Kxb5 Kxa3
>> +- (7.16) Depth: 15 00:00:31 13388kN, tb=608
>>45.Qf6+ Qxf6 46.exf6+ Kxf6 47.Kd4 Ke6 48.Kc5 Ke5 49.Kb6 Kd4 50.Kxa6 Kc5 51.b4+
>>Kc4 52.Ka5 Kb3 53.Kxb5 Kxa3
>> +- (7.16) Depth: 16 00:00:41 18574kN, tb=1399
>>
>>(Utzinger, MyTown 30.01.2004)
>>
>>
>>Shredder 8 - Chess Tiger 15.0
>>8/6k1/p3Q3/1p2P3/5q2/P2K4/1P6/8 w - - 0 1
>>
>>Analysis by Chess Tiger 15.0:
>>
>>45.b3
>> +- (1.70) Depth: 1 00:00:00
>>45.b3
>> +- (1.72) Depth: 1 00:00:00
>>45.b3 Kh7
>> +- (1.78) Depth: 2 00:00:00
>>45.b3 Qf1+ 46.Kc2 Qf2+ 47.Kd1
>> +- (1.44) Depth: 3 00:00:00 2kN
>>45.Qe7+ Kg6 46.Qd6+ Kh5 47.b3
>> +- (1.52) Depth: 3 00:00:00 3kN
>>45.Qd7+ Kg6 46.Qc6+ Kf7 47.e6+ Kf6 48.Qxa6
>> +- (1.62) Depth: 3 00:00:00 5kN
>>45.Qd7+ Kg6 46.Qc6+ Kg5 47.e6 Kf6 48.Qxa6
>> +- (1.62) Depth: 4 00:00:00 11kN
>>45.Qd7+ Kg6 46.Qc6+ Kg5 47.Qe4 Qh2 48.b4
>> +- (1.54) Depth: 5 00:00:00 28kN
>>45.Qd7+ Kg6 46.Qc6+ Kg5 47.e6 Qg3+ 48.Kc2 Qf2+ 49.Kc3 Qe2
>> +- (1.60) Depth: 6 00:00:00 82kN
>>45.Qd7+ Kg6 46.Qd6+ Kh5 47.Qd5 Qg3+ 48.Kc2 Qf2+ 49.Kb3 Qf5 50.Kc3
>> ± (1.30) Depth: 7 00:00:00 317kN
>>45.Qd7+ Kg6 46.Qd6+ Kh5 47.Qd5 Qg3+ 48.Kc2 Qf2+ 49.Kb3 Qe2 50.Qf7+ Kg5 51.Qf6+
>>Kh5
>> ± (1.30) Depth: 8 00:00:02 889kN
>>45.Qe7+ Kg6 46.b3 Qg3+ 47.Kd4 Qxb3 48.Qf6+
>> ± (1.40) Depth: 8 00:00:03 1253kN
>>45.Qe7+ Kg6 46.Qd6+ Kg5 47.Qd8+ Kh5 48.Qd4 Qf1+
>> ± (1.34) Depth: 9 00:00:05 1996kN
>>45.Qe7+ Kg6 46.Qd6+ Kg5 47.Qd8+ Kh5 48.Qd4 Qf1+ 49.Kd2 Qf5 50.Qe3 Qe6 51.b3 Kg6
>> ± (1.36) Depth: 10 00:00:09 3754kN
>>45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qc6+ 49.Kf4 Qh6+ 50.Kg4 Qh2 51.Qd7+
>>Kf8 52.Qd8+ Kf7 53.Qf6+ Ke8
>> ± (1.38) Depth: 10 00:00:13 5280kN
>>45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qc6+ 49.Kf4 Qc1+ 50.Qe3 Qxb2 51.Qa7+
>>Kf8 52.Qxa6 Qf2+
>> ± (1.40) Depth: 11 00:00:23 9571kN, tb=1
>>45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qc6+ 49.Kf4 Qh6+ 50.Kg4 Qe6+ 51.Qf5
>>Qc4+ 52.Kh5 Qc6 53.b4
>> ± (1.38) Depth: 12 00:00:32 13409kN, tb=2
>>45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qxb2 49.Qd7+ Kf8 50.Qd6+ Ke8 51.Qe6+
>>Kd8 52.Qb6+ Kd7 53.Qa7+ Kd8
>> ± (1.30) Depth: 13 00:01:22 35014kN, tb=18
>>45.Qd6 Qc4+ 46.Ke3 Qb3+ 47.Ke4 Qc2+ 48.Qd3 Qxb2 49.Qd7+ Kh6 50.Qe6+ Kg5 51.Qf6+
>>Kg4 52.Qf3+ Kg5 53.Qg3+ Kh5
>> ± (1.22) Depth: 14 00:08:27 223480kN, tb=629
>>45.Qe7+ Kg6 46.Qd6+ Kg5 47.Qd8+ Kh5 48.Qd4 Qf3+ 49.Kd2 Qb3 50.Ke2 Qe6 51.Kd3
>> ± (1.38) Depth: 14 00:12:10 321461kN, tb=707
>>
>>(Utzinger, MyTown 30.01.2004)
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