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Subject: Re: What is SEE?

Author: Bert van den Akker

Date: 11:48:41 10/04/99

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On October 03, 1999 at 21:48:40, Bas Hamstra wrote:

>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.



This concept looks very complicated because you must take in consideration pins,
capturing on different squares and check moves!

Maybe a normal capture quiescence search is quicker and more precise.



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