Computer Chess Club Archives




Subject: The "same threat extension" as effective way to resolve horizon problem

Author: Sergei S. Markoff

Date: 06:08:28 10/01/03


>What is the new quasy-Botvinnik extension if

Well. I can inform chess community about one of my quasy-Botvinnik methods.
I will be glad to receive your own experiment results and/or other
considerations about this method.

One of Botvinnik ideas is to determine attack/defence targets for further
analysis of attack/defend trajectories. One of the way to find this target is
null-move search. If the result of null-move search < beta we can see the move
which fail low search bound. This move is a current threat. For example it's a
threat of losing some piece.

During the further search in this node we can found the defending move. The main
idea is to extend the search if the threat moves on ply and ply+2 has the same
target (capturing the same piece, promotes the same pawn). I can give you
example if you want.

It's one of simpliest way to use target info. But I think we can receive more
improvement exploiting this idea.

Best wishes,

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