Computer Chess Club Archives


Search

Terms

Messages

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

Author: Martin Bauer

Date: 01:50:23 08/01/02


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



This page took 0.01 seconds to execute

Last modified: Thu, 15 Apr 21 08:11:13 -0700

Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.