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Subject: Re: Fail-Low ?

Author: Nobuhiro Yoshimura

Date: 21:45:28 04/05/00

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On April 05, 2000 at 20:57:30, Robert Hyatt wrote:

>On April 05, 2000 at 20:54:52, Nobuhiro Yoshimura wrote:
>
>>   I am writing a Japanese Chess program using PVS with iterative deeping and
>>hash tables.   I often get a fail-low at the root node at the end stage of
>>the game.   I would like to know how offten do you get fail-lows in
>>searching the chess game tree and also what kind of bugs are possible to
>>cause many fai-lows.
>
>
>I don't quite understand why you think it is a bug.  IE sometimes when you
>go a ply deeper, you discover some threat your opponent has that you simply
>can't defend against, and the score drops.  It is not abnormal...

I just thought that since PVS is a good searching algorithm and is
being used by many chess programmers that it would not produce
many fail-lows that are very bad for search efficincy.



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