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Subject: Re: Tablebases question

Author: Robert Hyatt

Date: 20:41:06 04/27/01

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On April 27, 2001 at 10:40:58, James T. Walker wrote:

>This position was reached DF/DJ the other day.  The behavior of Deep Fritz is
>not unusual for programs with tablebases.  That is trying to give away a piece
>to reach the won ending in tablebases.  My question is,  why do these programs
>think that the piece will be taken?  Why would taking the piece be in the PV
>when it is obvious that taking it leads to mate and it is not the best move?  If
>it is not expected to capture the piece then what would be the point of the
>move?  I'm not talking about later when taking the piece was done because it
>leads to a longer mate than not taking the piece.  Programmers? Anyone?

You are missing the point.  The programs know it _won't_ be taken... and
offering it forces the opponent to a worse position when it refuses...  IE it
can use the rook to force the king to the edge rather than take it...




>
>[D]r7/8/5R2/2k5/8/3R1K2/6P1/8 w - - 0 70
>
>Thanks,
>Jim



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