Author: Angrim
Date: 16:10:46 10/16/03
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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 PC programs with no CPU speed mentioned were run on a P2 300 Mhz. >Morphy was from the Great Game system 6502 at 2 Mhz. > >m6 = anounced mate in 6 >no solve is usually 10 minutes > >Chessmaster 9000 6:14 m11, 8:51 m6, 9:59 m4 >crafty no solve >pocket fritz < 44 sec >yace < 7 min m11, 26:30 m4 >ruffian 1.0.0 no solve >bringer 15 min no solve >rebel10 17 sec m6, 37 sec m4 >uscf 5 sec >morphy 5:27 >rebel12 no solve 7:00 >ruffian 1.0.1 1:53 m11 >fritz532 3:21 m8 Nc3 >pocket genius 3 min no solve >pocket grandmaster 6 min Ne3 +12.26 12/51 >extreme 2:54 m6 16/34 >doctor3 15 sec m4 >sargon4 5 sec m4 (old PC chess program) >lg2kv2.7 10 min no solve >wkchess 33 sec >yacepdb 30 sec m4 >Novag sapphire ii 1:33 m5 >Novag star diamond 0:55 m5 >Chessmaster 9000 1.7 Ghz AMD 0:42 m11, 0:59 m6, 1:06 m4 > >Post a tougher one than this if you know of one. > >Bill
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