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Subject: Re: Wrong endgame evaluation by Junior 7

Author: Rafael Andrist

Date: 11:54:18 01/02/02

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On January 02, 2002 at 14:46:30, Dann Corbit wrote:

>On January 02, 2002 at 14:24:04, Hansjoerg wrote:
>
>>In the following position Junior 7 plays as black Ba5 (eval 0.00).
>>and is mated in 3 moves. The evaluation stays at 0.00 until the mate.
>>
>>6k1/8/2N1N1K1/8/8/8/8/4b3 b - - 0 77
>
>That is a strange one.  With tablebase files, it's a simple lookup:
>
>Crafty v18.12g
>
>White(1): epdpfga bh4.epd bh4.out
>PFGA: EPD record: 1
>end-game phase
>              clearing hash tables
>              time surplus   0.00  time limit 30.00 (3:30)
>         nss  depth   time  score   variation (1)
>                2     0.00  Mat03   1. ... Bd2 <HT>
>                2     0.01   0.01   1. ... Bh4 <HT>
>              time=0.01  cpu=100%  mat=3  n=54  fh=100%  nps=10k
>              ext-> chk=0 cap=0 pp=0 1rep=0 mate=0
>              predicted=0  nodes=54  evals=1
>              endgame tablebase-> probes done=8  successful=8

The position is drawn, but the side to move is half point critical.
It's basically the same problem as in KNN-KP but it happens seldom with a piece.

Rafael B. Andrist



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