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

Author: Gerd Isenberg

Date: 13:12:38 10/01/03

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

>Hello!
>
>>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,
>Sergei


Thanks for sharing, Sergei.

Sounds very interesting - have to think about.
An example may helpfull...

Regards,
Gerd



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