Author: James Robertson
Date: 11:31:43 04/28/01
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On April 28, 2001 at 10:06:45, Vincent Diepeveen wrote: >On April 27, 2001 at 21:46:26, Dann Corbit wrote: > >>Since bishops can only touch 32 squares of a chess board, has anyone bothered to >>write a system using 32 bit bitboards for bishops? About like a rotated >>bitboard, but shrunk by half. >> >>Also, knights can only cover a 5x5 area (with only 8 spots attacked or defended) >>and so it seems that knights might also use a compressed scheme (though not >>nearly so obvious as bishops). > >What would be the advantage of that in evaluation Dan? > >If i just consider a few squares for a bishop, how do i figure out >its influence upon king safety for example? I think the idea would be to keep track of which squares in in the bishop board and which are not, so that they can be mapped to their "real" square later for evaluation. However, this would require extra 32 bit piece bitboards in addition to the 64 bit piece bitboards, and the overhead of updating these would outweigh any benefits. James > >best regards, >Vincent
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