Author: William Kerr
Date: 15:50:32 10/16/03
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. 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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