Author: Gerhard Vetter
Date: 06:59:56 03/09/00
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On March 08, 2000 at 19:07:36, James Robertson wrote: >On March 08, 2000 at 18:34:44, Gerhard Vetter wrote: > >>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 > >Because Fritz only uses the tablebases if the current position is in the >tablebases (since it uses tablebases stored on the CD, it would be too slow to >use them in the search). > >James thanks for everybody's input, what I learned that in some endgame positions one better not uses tablebases access because the implementation is still buggy. Gerhard
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