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Subject: Re: What is the use of extensions?

Author: Vincent Diepeveen

Date: 10:07:41 01/10/00

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On January 10, 2000 at 10:08:29, Ulrich Tuerke wrote:

>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.

That's very well formulated Uli!
>Uli



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