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Subject: Re: Mate in #6, no in #7, #7 again, still #7, down to #6, back to #7 ????

Author: Ulrich Tuerke

Date: 14:15:48 01/20/01

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On January 20, 2001 at 08:40:31, John Wentworth wrote:

>Has anyone else seen programs annouce a Mate in X number of moves only to have
>it repeat it the several times, or be just wrong all together. I have Hiarcs
>7.32 and it does this frequently, it's like it can't count or it's not seeing
>everything it should. If I remember correctly, other programs I used to play did
>not have this problem.

Sometimes programmers prefer the approach to terminate the search as soon as a
mate in the tree had been detected.
This sounds reasonable; usually it suffices to find a mate in order to win the
games.
In case a mate had already previously been announced this may lead then to the
weird effects which you have observed.
I have already seen a case where a program was continously announcing mates and
finally drawing by a repetition of position; unfortunately it was my prog. -:)

Uli



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