Author: Gerd Isenberg
Date: 10:36:37 11/20/02
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On November 20, 2002 at 02:31:22, Anthony Cozzie wrote: >On November 19, 2002 at 12:25:11, Gian-Carlo Pascutto wrote: > >>On November 19, 2002 at 11:35:24, Robert Hyatt wrote: >> >>>Bitboards have a bit of a performance advantage on 64 bit processors, >> >>Proof? >> >>-- >>GCP > >Here's a thought. Bitboards are fundamentally the inverse of a standard board. >A 0x88 board (or similar) answers the question "What is on square A". A >bitboard answers the question "A is on square What" (hmm, that didn't come out >so well). The point is, if you want to know what piece is on square 45 a 0x88 >will work well. If want to know what squares your knights are on, a bitboard >will work well. This reminds me of the unique table in ROBDDs for some reason. > Hi Anthony, That's the point. May be a hybrid approach ... Btw. my favorite is "Stink Food", i love this final guitar solo soo much... Cheers, Gerd >I don't think these schemes are exclusive. I know in zappa I have both a 64 >entry array and bitboards for all piece types. Of course, zappa is not known >for the brilliance of its evaluation or the speed of its move generation. > >anthony
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