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Subject: Re: What is the use of extensions?

Author: Jan Pernicka

Date: 03:27:35 01/10/00

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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.

Hi,
 You may think extensions while searching a game tree - OK?
 So, normally you search to a fixed depth, say 5 plies (standard
  for my program...), but some branches could or should be searched
  deeper because they are "interesting" - e.g. when capture or check
  happens, you should also perform "quiescence seach" at the leaves
  to get a stable position - it means - no direct threats are present
  ( - you are not in the middle of the wild sequence of capturing ...),
  You could use any other extensions of your own ( e.g. a paw gets to
  the 7th rank ...) but be careful of exponential explosion...
    Well, this was only a little resume and I don't know if it answers
  your question at all...
          Have a nice day.         John P.




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