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

Author: Georg v. Zimmermann

Date: 04:37:51 08/02/02

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Hi,

sometimes the second best move should display a lot worse value with fail soft,
no ?

Georg



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.
>
>I am doing an AlphaBeta Search with aspiration window and calculate the while
>iterative deepening the first move with an 2 Pawnvalue Window, all the following
>moves with an zero window.
>
>My problem now ist, that I have an good value for the best move, but all other
>values are almost as good, as the best move, even if I expect the exact value of
>the best move to be _much_ better than all others.
>
>I think that comes from AlphaBeta, where it is enough to be lower than
>bestvalue, no interest in "how much", am I right?
>
>I there a poosibility to get a better Value at the root node for secondbest move
>with a specific searchdepth?
>
>while iterative deepening at the root node (for distance  := 1 to
>SearchDepth...) I want to ask something like this:
>
>IF (distance = 7) AND (BestValue < SecondBestValue+3*PawnValue) THEN dont waste
>to much time in thinking...
>
>But as I described, even if there is only 1 possibility to recapture a queen the
>values are close together, for exaple 900, 897, 995 ...
>
>any Ideas?
>
>Bye
>
>Martin



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