Author: Anthony Cozzie
Date: 17:56:30 10/16/03
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On October 16, 2003 at 19:10:46, Angrim wrote: >On October 16, 2003 at 18:50:32, William Kerr wrote: > >> >>Worlds toughest until someone finds a tougher one. >> >>After timing engines solving many mates in four, this one was by far the >>toughest. >> >>[D] 8/3p1p2/5Ppp/K2R2bk/4pPrr/6Pp/4B2P/3N4 w - - bm Nc3;id #1097 mate in 4 >>very-very tough; >> >>This is a composed mate in 4 problem from Benko's Baffler's #1097. >> >>Most engines take a very long time to find the mate in 4. > >kidding? searching this on an Athlon 1.2ghz so somewhat more than 4x as fast >as the hardware used below.. >proved that move d1e3 wins, 4 turns >PN:206654 evals, 16499 expands, 16 max ply, 0.32 seconds real, 0.30 cpu For engines with null-move pruning, this is a very tough position. anthony [snip]
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