Author: John Merlino
Date: 17:50:56 04/08/03
Go up one level in this thread
On April 08, 2003 at 19:30:24, Robin Smith wrote: >The following position is a rather trivial (for a human) perpetual check. Why >does it take some programs so long to see it? Many of today's top programs >think White is winning, and after long searches too! Which program detects >perpetual and returns a draw score the fastest? > >Tiviakov,S - Tseshkovsky,V >Kropotkin, 1995 >[D] 6k1/7p/4Q1p1/3pP1P1/p6q/Pp1r2R1/1P5P/7K b - - 0 1 > >Robin Chessmaster 9000, on a relatively humble P3-750, needs 1:42 to return a draw score: Time Depth Score Positions Moves 0:00 1/3 6.39 1863 1...Kh8 2.Qf6+ Kg8 3.Qd8+ Kg7 4.Qe7+ Kg8 5.Rxd3 Qe1+ 6.Kg2 0:00 1/4 6.24 7180 1...Kh8 2.Qf6+ Kg8 3.Qd8+ Kf7 4.Qd7+ Kf8 5.Qd6+ Kg8 6.Rxd3 Qe1+ 7.Kg2 0:00 1/5 6.12 21210 1...Kh8 2.Qf6+ Kg8 3.Qd8+ Kg7 4.Qd7+ Kh8 5.Qc8+ Kg7 6.Qc7+ Kg8 7.Qb8+ Kf7 8.Rxd3 Qe1+ 9.Kg2 0:00 1/6 6.10 57710 1...Kh8 2.Qf6+ Kg8 3.Qd8+ Kg7 4.Qd7+ Kh8 5.Qc8+ Kg7 6.Qc7+ Kh8 7.Qb8+ Kg7 8.Qa7+ Kg8 9.Qa8+ Kf7 10.Rxd3 Qe1+ 11.Kg2 0:00 1/6 5.42 91520 1...Kf8 2.Qf6+ Ke8 3.Qc6+ Kd8 4.Qd6+ Ke8 5.Qb8+ Kd7 6.Qb5+ Ke6 7.Qe8+ Kf5 8.Rxd3 Kxg5 0:01 1/7 5.37 144298 1...Kf8 2.Qf6+ Ke8 3.Qc6+ Kd8 4.Qb6+ Kd7 5.e6+ Ke7 6.Qb7+ Kxe6 7.Qc6+ Kf7 8.Qf6+ Kg8 9.Rxd3 0:02 1/8 5.23 272956 1...Kf8 2.Qf6+ Ke8 3.Qc6+ Ke7 4.Qb7+ Ke6 5.Qb6+ Kxe5 6.Qf6+ Ke4 7.Qe7+ Kf5 8.Qd7+ Ke5 9.Qe8+ Kd6 10.Rxd3 Qxg5 11.Qxa4 0:05 1/8 2.11 634874 1...Kh8 2.Qf6+ Kg8 3.Qd8+ Kg7 4.Qc7+ Kh8 5.Qb8+ Kg7 6.Qa7+ Kf8 7.Qc5+ Kg7 8.Rxd3 Qe4+ 9.Kg1 Qe1+ 10.Kg2 Qe2+ 11.Qf2 Qxd3 0:09 2/9 1.65 1094538 1...Kh8 2.Qf6+ Kg8 3.Qd8+ Kg7 4.Qc7+ Kh8 5.Qb8+ Kg7 6.Qa7+ Kg8 7.Qa8+ Kg7 8.Qb7+ Kg8 9.Rxd3 Qe4+ 10.Kg1 Qe1+ 11.Kg2 Qe2+ 12.Kg3 Qxd3+ 13.Kh4 0:15 3/10 1.70 1723117 1...Kh8 2.Qf6+ Kg8 3.Qd8+ Kg7 4.Qc7+ Kh8 5.Qb8+ Kg7 6.Qa7+ Kf8 7.Rxd3 Qe4+ 8.Kg1 Qxd3 9.Qb8+ Kf7 10.Qc7+ Ke8 11.Qc8+ Ke7 12.e6 0:39 4/11 0.73 4336967 1...Kh8 2.Qf6+ Kg8 3.Rxd3 Qe1+ 4.Kg2 Qe2+ 5.Kg1 Qxd3 6.Qd8+ Kg7 7.Qc7+ Kf8 8.Qc8+ Ke7 9.Qc5+ Kf7 10.Qf2+ Ke8 11.e6 Qb1+ 12.Kg2 1:42 5/12 0.00 10638946 1...Kh8 2.Qf6+ Kg8 3.Rxd3 Qe1+ 4.Kg2 Qe2+ 5.Kg1 Qxd3 6.Qd8+ Kg7 7.Qc7+ Kf8 8.Qc8+ Ke7 9.Qc5+ Kf7 10.Qc7+ Kf8 jm
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