Re: 4.0 p62 weak in endgame?

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Article #5279

#5279

From: Tom Vijlbrief
Date: Tue, 30 Nov 1993 13:52

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c9524@rrzc1a.uni-regensburg.de (Ulrich Windl) writes:

>Yesterday I let it play against itself: finally white had
>3 pawns, 1 rook, 1 queen, while black had a rook (besides each party having
>a king). Gnuchess took quite a long time to win (with white, of course 8-)).

There is a bug in pl62 that it does not take the best (i.e. shortest)
mating move.

This is the fix (in search() in search.c)


  /* look at each move until no more or beta cutoff */
  do_pvs= 0;
  for (pnt = pbst = TrPnt[ply]; pnt < TrPnt[ply + 1] &&
  (best <= beta || (ply == 1 && best > 9000)); pnt++) /* Find best mate, TomV */
    {



Tom

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References: <C9524.93Nov30092838@rrzc1a.uni-regensburg.de>

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From: tom@izf.tno.nl (Tom Vijlbrief)
Subject: Re: 4.0 p62 weak in endgame?
Message-ID: <CHB585.Fv7@izf.tno.nl>
Organization: TNO Institute for Perception
References: <C9524.93Nov30092838@rrzc1a.uni-regensburg.de>
Date: Tue, 30 Nov 1993 13:52:53 GMT
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