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Subject: Re: Also Fritz 8.0.0.23 and Crafty 19.03 miss a mate in one!

Author: Vine Smith

Date: 19:11:57 07/25/03

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On July 25, 2003 at 20:30:47, Sune Fischer wrote:

>On July 25, 2003 at 20:13:12, Mike Byrne wrote:
>
>>Since you can only claim draw on your move, make the 100 ply counter a 101 ply
>>counter and this problem goes away (I think)...will test it in Crafty 19-04 SE
>
>But it introduces the other problem, that the engine won't see a draw until ply
>101.
>
>Perhaps that is less of a bug, afterall you aren't required to claim a 50 move
>draw.
>
>The only downside is that 50 move draws are far more frequent than mates on the
>50th move.
>
>-S.

How often would waiting an additional ply "spoil" a 50 move draw? If there was a
valid way to make progress, an engine would have likely found it much earlier.
Whereas overlooking mate immediately before the draw can be claimed seems much
more probable, in any ending involving queens, perhaps some others where the
king is caught in a corner of the board.

Vine Smith



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