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Subject: Re: Leonid's very easy position is actually VERY DIFFICULT!

Author: Jaime Benito de Valle Ruiz

Date: 16:18:03 10/21/03

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On October 21, 2003 at 19:11:37, Uri Blass wrote:

>On October 21, 2003 at 18:55:46, Jaime Benito de Valle Ruiz wrote:
>
>>Yes, it is a hard position for programs... that are used to prune "useless" and
>>"improbable" situations in order to find useful lines in normal games. My
>>program, after removing some selective search prunning functions, finds the
>>answer in almost no time, but if I leave the program like that, it's crap under
>>normal circumstances and has no chance against any other programs/humans.
>>This is a useful position for a "health check", or maybe for Qsearch
>>optimization, but othersise it's not real!! A real headache for people in a
>>chess magazine anyway.
>
>I suspect that the problem of most normal chess programs is not too much pruning
>but big qsearch when 99.9% of the nodes are qsearch nodes.
>
>Uri

I agree with you!!!

My program spends a ridiculous amount of the search in useless Q-nodes. It's an
extremely tactical position that would never happen in a normal game (because
either player would have found the way to win long time ago).



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