Author: Steven J. Brann
Date: 19:31:46 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 Chessmaster 9000 on a 3.0G P4 machine with default personality SS=12 finds a mate in 7 in less than a second and mate in 4 in 2 seconds: Time Depth Score Positions Moves 0:00 1/3 15.20 2201 1.Nxh1 Nb3 2.Bxb3 0:00 1/4 16.28 7840 1.Nxh1 e3 2.Kxb6 Ke4 3.Rxa1 0:00 1/5 16.41 36196 1.Nxh1 Nb3 2.Bxb3 e3 3.Kxb6 0:00 1/5 17.74 86196 1.Kxb6 Bg2 2.c7 Bxh3 3.Nxh3 Nb3 4.c8=Q 0:00 1/6 Mate07 172027 1.Kxb6 Bg2 2.c7 Bxh3 3.Nxh3 Nb3 4.c8=Q d3 5.Bxc3+ Kd6 6.Rd8+ Ke7 7.Qd7# 0:00 1/7 Mate07 252651 1.Kxb6 Bg2 2.c7 Bxh3 3.Nxh3 Nb3 4.c8=Q d3 5.Bxc3+ Kd6 6.Qc7+ Kd5 7.Bxb3# 0:01 1/8 Mate07 437937 1.Kxb6 Bg2 2.c7 Bxh3 3.Nxh3 Nb3 4.c8=Q d3 5.Bxc3+ Kd6 6.Qc7+ Kd5 7.Qc6# 0:02 1/8 Mate04 897626 1.Rxc3 Bf3 2.Re3 Nb3 3.Bxb3 dxe3 4.Bc3# Steve
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