Computer Chess Club Archives




Subject: Re: new thoughts on verified null move

Author: Omid David Tabibi

Date: 17:52:01 11/23/02

Go up one level in this thread

On November 23, 2002 at 20:00:15, Tony Werten wrote:

>On November 23, 2002 at 11:11:16, Christophe Theron wrote:
>>On November 23, 2002 at 09:22:37, jefkaan wrote:
>>>oops, wasn't finished yet..
>>>>are done by using the results of the positional eval
>>>>to prune the q-search,
>>>and there using only material eval
>>> (haven't tried it out yet, and wouldn't
>>>know how to do it, but it's only an idea,
>>>you know.. to explore options of
>>>more effective branch factor reducements
>>>and efficient programming (besides
>>>lousy solutions as inline assembler
>>>and bitboards..
>>Yes Chess Tiger does much more pruning than known (published) techniques.
>>I think other top programs do it also.
>>I still fail to see why the efficiency of an algorithm depends on what your
>>QSearch does.
>>If your pruning algorithm is good, it will increase the strength of the program
>>regardless on how good your QSearch is.
>>If your QSearch is smart, then it will increase the strength even more.
>>I don't like the idea that some algorithms that have almost nothing to do with
>>each other would have such an influence on each other. It is indeed possible and
>>it probably happens all the time, but it's hard to work with such hypothesis in
>>I think it's better to first assume that the kind of QSearch you do will not
>>interfere with the quality of the pruning algorithm used before the QSearch.
>>If your QSearch sucks, it's not because you are doing a lot of pruning in the
>>"full width" part of the search. It's because it sucks.
>The paper does prove that the more your (q)search sucks, the better your pruning
>algoritm seems. But that's not really news.

Does it prove that?! No, it's just my impression based on the data gathered so
far. Maybe a reduction of 2 (instead of 1) in case of fail-high report, will
work better in programs with heavy extensions and quiescence.

>>    Christophe

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