Author: Mike S.
Date: 15:33:11 04/12/03
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On April 12, 2003 at 16:21:25, John Merlino wrote: >On April 12, 2003 at 08:42:17, Jorge Pichard wrote: > >>Every top program should be able to find instantly this Mate in 16. >>[D]4r1r1/bB4p1/8/2p1kPKn/n7/3R4/3P4/2B5 w - - 0 1 >>(...) >It takes Chessmaster 9000 four seconds to announce Mate in 16 on a P3-733. On my P3/700 MHz, the default CM9K personality (4 MB hash) takes only 1 second: Time Depth Score Positions Moves 0:00 1/3 0.00 4289 1.Rd5+ Ke4 2.Rd6+ Ke5 3.Rd5+ 0:00 1/4 3.13 18020 1.Rd5+ Ke4 2.Rd7+ Ke5 3.Ba3 c4 4.Bd6+ Kd4 5.Bf8+ Ke5 6.Rd5+ Ke4 7.Rd8+ Ke5 8.Rxe8+ Kd4 9.Rd8+ Ke5 10.Bd6+ Kd4 11.Rxg8 0:00 1/5 3.45 49008 1.Rd5+ Ke4 2.Rd7+ Ke5 3.Ba3 c4 4.Bd6+ Kd4 5.Bf8+ Ke5 6.Rd5+ Ke4 7.Rd8+ Ke5 8.Rxe8+ Kd4 9.Rd8+ Ke5 10.Bd6+ Kd4 11.Rxg8 Bc5 12.Bxc5+ Nxc5 13.Kxh5 Nxb7 14.Rxg7 0:01 1/6 Mate16 143268 1.Rd5+ Ke4 2.Rd7+ Ke5 3.Ba3 c4 4.Bd6+ Kd4 5.Bf8+ Ke5 6.Rd5+ Ke4 7.Rd8+ Ke5 8.Rxe8+ Kd4 9.Rd8+ Ke5 10.Rd5+ Ke4 11.Rd7+ Ke5 12.Bd6+ Kd4 13.Bb4+ Ke5 14.d4+ cxd3ep 15.Re7+ Kd4 16.Re4# 0:03 1/7 Mate16 379921 1.Rd5+ Ke4 2.Rd7+ Ke5 3.Ba3 c4 4.Bd6+ Kd4 5.Bf8+ Ke5 6.Rd5+ Ke4 7.Rd8+ Ke5 8.Rxe8+ Kd4 9.Rd8+ Ke5 10.Rd5+ Ke4 11.Rd7+ Ke5 12.Bd6+ Kd4 13.Bb4+ Ke5 14.d4+ cxd3ep 15.Re7+ Kd4 16.Re4# Remarkable, even for the King. The 3rd move is silent! I wonder if any other engine could announce a mate in 16 with only 143.267 nodes. Depth 1/6 :o)) (But I guess this one may be easier than others, because black has most often only one legal reply, except at moves 3 and 14.) Regards, Mike Scheidl
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