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Subject: Re: Easy mate

Author: Frank Phillips

Date: 12:26:01 09/13/03

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On September 13, 2003 at 15:13:47, John Merlino wrote:

>
>
>The problem is that implementation of choosing a move from EGDBs is flawed in
>these cases. In general, the engine chooses the move that will lead to the
>shortest mate (if playing the winning side) or the longest mate (if playing the
>losing side).
>
>It is possible that either of those choices may be wrong, in that either the
>winning side will choose a move that leads to Mate in 61 (for example) that will
>be caught by the 50-move rule when choosing the Mate in 63 move will not be
>caught by the 50-move rule. The same (opposite) is true for the losing side.
>
>I think there might be too many possibilities for Black in this case to easily
>prove that White has a forced mate that will avoid the 50-move rule.
>
>jm

Yep... I can see that apparently equal losses (or wins) in N may not really be
equal because one involves a move that resets the 50 move counter, but the other
does not - and therefore leads to a draw.

Still it would be nice to see Gazza playing the wrong end of one of these ;-)

Frank



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