Author: Uri Blass
Date: 13:42:44 02/16/01
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On February 16, 2001 at 15:35:40, Lin Harper wrote: > > [D]8/8/8/2p5/R1P5/P5p1/P3K1p1/6k1 w > > Thanks for the help with FEN, guys. Now for the above position. > It's simple enough.. any club strength player would find the > right line in a short time. But can your comp find the mate > sequence? I do not agree that every club player will find the mate in a short time. I tried it for 1 minute without sucess. Crafty could prove a mate in 16 in less than 1 minute(56 seconds on p200). 1.Ra7 Kh1(2) 2.Rh7+ Kg1 3.Kd2 Kf1(2) 4.Rf7+ Kg1 5.a4 Kh1(2) 6.Rh7+ Kg1 7.a5 Kf1(2) 8.Rf7+ Kg1 9.a6 Kh1(2) 10.Rh7+ Kg1 11.a7 Kf1(2) 12.Rf7+ Kg1 13.a8Q Kh1(2) 14.Qh8+ Kg1 15.Qa1+ Kh2 16.Rh7# I think that 3.Kd2 is the hardest move for humans who try to prove the mate because a lot will prefer 3.Kf3 that is also winning. The long move 15.Qa1+ is also not trivial to find. I am also not sure if mate in 16 is the shortest mate. Crafty 18.01 has no problem to find the mate so I guess that the problem is not hard for computers(at least for programs that use the single reply extension like Crafty). Uri
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