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Subject: Re: What is the use of extensions?

Author: Ulrich Tuerke

Date: 07:08:29 01/10/00

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On January 10, 2000 at 07:41:08, Vincent Diepeveen wrote:

>On January 09, 2000 at 22:36:57, leonid wrote:
>
>>Hello!
>>
>>What is a use of extensions and what kind of extensions existe in chess game?
>>
>>Thanks for explanation!
>>Leonid.
>
>I see extensions as takin a deeper look to some lines analyzed by the
>machine, because the nominal search depth is likely to miss the outcome
>of it. So i would extend a move only if there is a chance for a horizon
>effect if not applying the extension.
>
>The most obvious extensions: extend when in check, extend when mate threat.
>Other possible extensions: extend when passed pawn races are happening.
>
>Vincent

in other words, it's a workaround for the infamous horizon-effect. Extensions
should make it more difficult for the program to shift relevant lines beyond the
search horizon.

Uli



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