Author: Tim Foden
Date: 01:41:59 10/18/03
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 It certainly looks like a null move issue to me! :) 47s... GLC 3.00 with null move on: 12 46.807 +Mate04 100560k Rxc3 Nb3 2. Rxb3 Kd5+ 3. Rg3+ Kc5 4. Rf5# 15s... GLC 3.33 (devel version with more null restrictions) null move on: 10 15.412 +Mate04 28739k Rxc3 Nb3 2. Rxb3 e3 3. Rxe3+ dxe3 4. Bc3# 6s.... GLC 3.00 with null move off: 7 6.229 +Mate04 9491034 Rxc3 Bf3 2. Re3 Nb3 3. Bxb3 dxe3 4. Bc3# Cheers, Tim. [All AXP 2.1GHz, 24MB hash]
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