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

Author: Sylvain Renard

Date: 00:46:02 07/12/99


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






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