Author: Torstein Hall
Date: 15:44:14 02/07/04
Go up one level in this thread
On February 06, 2004 at 20:04:48, Christophe Theron wrote: >On February 06, 2004 at 19:33:22, Bob Durrett wrote: > >>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. > > > >I have worked a lot on zugzwang detection in Tiger 15, and it has been improved >further in the new version (CT X). I think that's the answer. It's simply an >area I've been working on. > > > > Christophe Can I asume you belive there is quite a bit of extra strength to pick up for a chess engine fixing this problem? I belived this occured pretty rarely in most games. Torstein
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