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Subject: Re: Endgame tablebases and draw by repetition : a bug in Crafty 16.5T (Fritz

Author: Robert Hyatt

Date: 07:16:11 07/12/99

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On July 12, 1999 at 03:46:02, Sylvain Renard wrote:

>Using Crafty 16.5T (Fritz interface) with endgame tablebases,
>I have noticed this bug (easy for me, my program has the same!!) :
>
>Start position:
>
>4k3/8/6P1/4K1P1/8/8/8/8 w - - 0 1
>
>White: Ke5, pawns g5 & g6
>Black: Ke8
>white to move (machine = black, white = weak player!).
>1.Kd6?? (there are several wining moves!) 1...Kf8= 2.Ke5 Ke8?? leading
>to the start position, so Crafty 16.5T (Fritz interface) evaluation is 0.00 ,
>because of the repetition of the position!
>  This bug is not present in "normal" Crafty 16.11 (Winboard interface) so I
>wanted to ask Mr Hyatt his explanation.
>  Thank you and best regards,
>    Sylvain Renard


There doesn't appear to be anything wrong.  Crafty considers two repetitions a
draw, as it always has.  In that regard, the above is a draw as far as it is
concerned.




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