Author: Russell Reagan
Date: 13:25:44 01/08/03
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On January 08, 2003 at 14:31:10, Ed Schröder wrote: >Yes Gerd, this is probably most true. I never had the time to put energy in the >bit-boards technique. Do you have any idea about the number of clocks needed to >extract the hanging pieces from a position using bitboards? I wrote a program using the same algorithms that Gerd uses for generating attacks, but mine are written in C instead of using MMX like Gerd, so mine are going to be slower than his. In any case, the engine is somewhat slow. It gets around 70knps or maybe a little more on my PIII 733 MHz machine (compare with approximately 250knps for Yace), and it is only doing alpha-beta with material+mobility evaluation and nothing else like hash table, move ordering, or anything else that would cause a slow down. So I think for generating attack bitboards on the fly, it is doable on a 32-bit machine, but is probably better to wait until 64-bit machines unless you are good with MMX assembly like Gerd, or if you use rotated bitboards like in Crafty it might be reasonably fast as well.
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