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

Author: Anthony Cozzie

Date: 10:00:50 10/01/03

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On October 01, 2003 at 09:08:28, Sergei S. Markoff wrote:

>>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,

Wouldn't this have the effect of extending lots of silly moves?

For example, if my Queen is hanging

BxP+ KxP (extension triggers)

R+ KxR   (extension triggers)

Just offhand, it seems to me like a good Q-search should fix these problems.


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