Author: James Robertson
Date: 12:05:16 10/04/99
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On October 04, 1999 at 14:48:41, Bert van den Akker wrote: >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. Normal capture quiescence is more precise, but much much much slower. I do not worry about pins or checks when doing my SEE, and I have yet to see any major problems. Capturing on different squares is not a problem, as the qsearch takes care of that. I don't look for batteries. That has caused me some problems though, especially as my program doesn't see any positional harm in letting 2R+Q triple up on his king file.... James
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