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Subject: Re: Repetition Detection

Author: James Swafford

Date: 07:22:38 12/01/04

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On December 01, 2004 at 05:43:19, Renze Steenhuisen wrote:

>
>
>Hi All,
>
>I implemented a basic repetition detection algorithm, but unfortunately it seems
>to cause more nodes to be expanded! Is this a weird fenomenon, or is it OK?
>
>Cheers!
>
>  Renze


It might be ok.  Suppose you're searching move A then move B.
Move A is a draw by rep.  Move B will return a score of +3
pawns.  Also, let's say the search for move A will return a
score of +5 pawns if you disable repetition detection.

With draw by rep disabled, you'll get your +5 pawns for
move A, then quickly search move B (lots of cutoffs).

With draw by rep enabled, move B will become the new "best move",
so you'll likely search far more nodes.

--
James




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