Author: Ross Boyd
Date: 17:01:56 10/17/03
Go up one level in this thread
On October 17, 2003 at 17:45:08, William Kerr wrote: >Hi > >I posted the worlds toughest mate in 4 yesterday but I included the wrong epd >string. That was a tough mate in 4 but this one is far far tougher for some >engines. Its probably a null move issue for some engines. > >[D] 5R2/2K5/1pP5/4k2p/3pp3/2p4N/B4N1b/n1R1B2b w - - id BB #1217 mate in 4; > > > >Again this is from Benko's Bafflers from Chess Life magizine. > >Chessmaster 9000 AMD 1.7Ghz 2 sec m4 >pocketFritz 1.0 17 min m16 >GGM Capa module 43 min 25 sec >Crafty 19.3 AMD 1.7Gh 44 min m5 >ruffian 1.0.1 P2 300 mhz 40 sec >star diamond 1 hr & 50 sec m5 >star diamond mate in 4 level 17 sec >yacePdb P2 300 mhz 4 min m6, 5 min m4 >fritz532 8 sec m6, 14 sec m4 >lg2000v27 greater than 10 min less than 18 min >bringer 5 min m9 >waxman 1:08 m4 P2 300 mhz > >Have fun with this one. > >Bill TRACE solves it fairly quickly... and she uses nullmove pruning. Analysis by TRACE 1.25 P3-600 32Mb Hash: 1.Nxh1 b5 2.Rxa1 +- (14.32) depth: 2 00:00:00 1.Nxh1 b5 2.Rxa1 +- (14.32) depth: 3 00:00:00 1.Nxh1 b5 2.Kd7 +- (14.36) depth: 4 00:00:00 1.Nxh1 b5 2.Kd7 b4 3.Re8+ Kf6 4.Rxa1 +- (14.48) depth: 5 00:00:00 11kN 1.Nxh1 b5 2.Kd7 Nb3 3.Re8+ Kf6 4.Bxb3 +- (14.71) depth: 6 00:00:00 30kN 1.Nxh1 +- (14.96) depth: 7 00:00:00 58kN 1.Nxh1 h4 2.Bxc3 dxc3 3.Kxb6 Kd6 4.Rxa1 +- (16.62) depth: 7 00:00:00 58kN 1.Nxh1 e3 2.Bg3+ Bxg3 3.Nxg3 Nb3 4.Bxb3 d3 5.Rxc3 +- (16.83) depth: 8 00:00:01 294kN 1.Nxh1 +- (17.08) depth: 9 00:00:01 511kN 1.Nxh1 h4 2.Re8+ Kf5+ 3.Kxb6 c2 +- (18.16) depth: 9 00:00:05 1900kN 1.Kxb6 +- (18.17) depth: 9 00:00:06 2293kN 1.Kxb6 Bg2 +- (20.15) depth: 9 00:00:08 2981kN 1.Kxb6 +- (20.40) depth: 10 00:00:09 3309kN 1.Rxc3 +- (20.41) depth: 10 00:00:19 7602kN 1.Rxc3 Bg2 2.Re3 Nb3 3.Bxb3 dxe3 +- (#4) depth: 10 00:00:28 11796kN 1.Rxc3 Bg2 2.Re3 Nb3 3.Bxb3 dxe3 4.Bc3# +- (#4) depth: 11 00:00:39 16383kN Ross
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