Author: Bob Durrett
Date: 16:33:22 02/06/04
Go up one level in this thread
On February 06, 2004 at 19:18:54, Christophe Theron wrote: >On February 06, 2004 at 13:48:48, Jaime Benito de Valle Ruiz wrote: > >>This endgame study can be game following the sequence >> >>1.Bd1 g1Q 2.Bxa4 Qc1 3.Bxd7 h5 4.Be8 h4 5.Ba4 Line >> >>[d] 8/3p4/p6p/k2N3B/p7/K6p/PP4pP/8 w - - 0 1 >> >>Many engines (Fritz 8, Hiarcs 8, Ruffian 1.01) cannot win this endgame, probably >>due to the well known null-move problem for extreme and rare positions such as >>this. >> >>They just don't find 5. Ba4 >> >>Try your engine after 4...,h4 >> >>[d]8/3p4/p6p/k2N3B/p7/K6p/PP4pP/8 w - - 0 1 >> >>All the above mentioned engines play 5.Bd7 and get a draw instead of winning. >> >>Regards, >> >> Jaime > > > >Chess Tiger X: 1.15 second on PIII-M 933MHz (Dell X200), 6Mb HT: > >N14 0.33s Bd1 g1=Q Bxa4 Qc1 Bxd7 h5 Be8 h4 Bd7 Qxb2+ Kxb2 0.00 >N15 0.66s Bd1 g1=Q Bxa4 Qc1 Bxd7 h5 Be8 h4 Bd7 Qxb2+ Kxb2 +0.90 >N15 1.15s Bd1 g1=Q Bxa4 Qc1 Bxd7 h5 Be8 h4 Ba4 Qxb2+ Kxb2 Kxa4 Kc... +3.26 > > > > Christophe The key question to be answered is: "What is there about Chess Tiger X that is different from the other engines mentioned which accounts for the fact that they could not find the move but TigerX could? Is the "null-move problem" not applicable to TigerX or is there some other reason? Bob D.
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