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Subject: Re: What is SEE?

Author: Bas Hamstra

Date: 18:48:40 10/03/99

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On October 03, 1999 at 15:08:56, Bert van den Akker wrote:

>Can sombody explain what SEE is.
>
>Bert

Static Echange Evaluation. You try to figure out without a real search what the
outcome of a capture sequence to one particular square will be. Suppose a black
rook is attacked by a white queen and a white knight and defended by a black
pawn and a black bishop. Then the SEE value is determined by consequently
letting the lowest valued piece capture to the square the black rook is on. If a
color has performed a capture and has still gain < zero you stop. Just like you
yourself would do to evaluate a capture sequence in a chessgame.

You can determine the exact SEE value, or just if a capture is a loser, which is
faster. Losing captures are skipped in the qsearch, which saves quite a lot of
nodes. If you not only want to do that, but sort all captures SEE wise, you have
to have the exact SEE score.

Personally I doubt it is worth the effort of perfect SEE sorting, but skipping
losers is a win. Everybody (except Vincent Diepeveen) agrees.

Regards,
Bas Hamstra.







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