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Subject: Re: Question about known extensions

Author: Don Dailey

Date: 09:38:12 06/12/98

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On June 12, 1998 at 03:49:36, Vincent Diepeveen wrote:

>Hello,
>
>Some time ago someone mentionned Deep Search extensions.
>I looked in archives but could not find anything about it.
>
>What exactly are deep search extensions,
>is it extending after the n-th extension more and more?
>
>Greetings,
>Vincent

Hi Vincent,

Deep search extensions are  a by-product of the null move search.
Essentially they are extensions given when the program fails a
null move search.  The assumption (when this happens) is  that
something interesting must be going on (it's usually just some
direct attack of something) and warrants an extension.

The typical implementation is to only grant this on 1 or 2 levels
near the leaf nodes of the main search.

- Don



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