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Subject: Re: Hiarcs 7.32 and mate announcements

Author: Shep

Date: 00:19:57 07/14/99

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On July 14, 1999 at 01:05:25, Terry Ripple wrote:

>On July 13, 1999 at 23:42:00, Brett Clark wrote:
>
>>On July 13, 1999 at 17:30:10, John Wentworth wrote:
>>
>>>I have had some games where Hiarcs will first announce mate in 3, then on it's
>>>next move it announces mate in 5, then back to 3, back up to 6 etc etc. I
>>>thought when it announced a mate in X number of moves, the moves were forced.
>>>Doesn't appear that way though. Has anyone else had this problem of am I
>>>interpreting it wrong?
>>
>>
>>I've had the same problem.  Once, it announced mate in 9, then on the opponent's
>>next move, it came back with an eval. of about +8.50 with no mate announcement.
>
>-------
>In several of my computer vrs computer matches, i seen Hiarcs announce Mate7-
>and this was 5-min. Blitz and was correct by its evaluation. I didn`t experience
>this problem that you are saying, as yet!

Actually, this problem can be observed in quite a lot of chess programs (Junior,
Fritz, Chess Tiger [rarely] etc.).
Maybe it has something to do with null-move (?).
Crafty seems to be one of the very few which does not have this peculiarity.
However, I have not yet seen this to be any problem since no program gets caught
in a "mate in 8 -> mate in 6 -> mate in 9 -> mate in 5 -> mate in 9" loop.

---
Shep



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