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Subject: Re: Exact value of second best move in AlphaBeta with aspiration Window

Author: Dieter Buerssner

Date: 14:45:33 08/01/02

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On August 01, 2002 at 09:32:08, Robert Hyatt wrote:

>On August 01, 2002 at 04:50:23, Martin Bauer wrote:
>
>>Hello all,
>>
>>In want to detect position at the root node, where the best move is _much_
>>better then all other moves. For Example, only 1 possibility for recapture the
>>quenn.
>
>
>Simple solution.  Search the recapture with the window (X,Y).  Search
>the _other_ moves with the window (X-q, Y-q) where q is some large
>constant (say 2.00).  If the best move is q better than the others,
>the others will _still_ fail low.  If one is within q of the best move,
>it will fail high...

I cannot totally follow here. After searching "the recapture with the window
(X,Y)", you get back a score s. I would then search the other moves with the
window(s-q, s-q+1).

>Then you have to re-search with a different window, which will cost a lot of
>time...
>

If you get a fail high here - why research? You already know that it is not an
"easy move".

Regards,
Dieter



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