Author: Gerhard Vetter
Date: 15:34:44 03/08/00
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On March 08, 2000 at 18:26:44, José de Jesús García Ruvalcaba wrote: >On March 08, 2000 at 18:04:48, Andrew Dados wrote: > >>On March 08, 2000 at 17:54:35, Gerhard Vetter wrote: >> >>>Lately I found this easy-to-solve but elegant little study: >>> >>> >>>8/8/8/8/4k3/1P1p4/1r6/R1N1K3 w Q - >>> >>>To my surprise many modern programs can't find the win despite of 5manTBS only >>>2ply away! >>> >>>Junior 6 (with 5manTBS) sees only a draw after 45 min on Celeron 500/ 128 >>>Also Shredder 4 and Nimzo 7.32 fail to solve it. >>> >>>It is interesting that the older versions of some of the above programs need >>>only 0 sec >>>(Nimzo99) resp. 10 sec (Junior 5.0). Tiger 12.0e takes also 0 sec. >>> >>>It would be interesting to know how other programs do in this position and even >>>more >>>interesting if someone can suggest a reason for this odd behaviour of some >>>leading programs. >>> >>>Since I don't know if this information is embedded in the EPD: white has still >>>castling rights. >>> >>>Gerhard >> > > Yes, the queenside castling rights are in the fen string you posted (it is the >'Q' after the side to move). > >>I can be that your tablebases are somehow broken.. note that all programs >>without TB access solved it... >>It's of course just a guess. >> >>-Andrew- > > The very simple explanation is that Nalimov tablebases do not store castling >rights. >José. sounds like a sensible reason, but why can Fritz 6 solve it then (with tablebases activated)? Gerhard
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