Author: Bas Hamstra
Date: 03:07:52 04/25/00
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On April 25, 2000 at 05:45:51, Dan Newman wrote: >On April 25, 2000 at 05:12:36, Bas Hamstra wrote: > >>On April 25, 2000 at 01:32:48, Tom Kerrigan wrote: >> >>>On April 25, 2000 at 01:20:11, Bas Hamstra wrote: >>> >>>>(Currently I myself have started all over trying to make a really fast rotated >>>>BB program. Looks promising so far: make/unmake=2M/sec and movegeneration=12M >>>>moves/sec on a Celeron 466) >>> >>>My program does gen/make/unmake at 2M/sec, and just gen at ~10M/sec. >>> >>>I'm not using any sort of bitboards. >>> >>>Maybe something to consider... >>> >>>-Tom >> >>I have them all, including 0x88. I don't think I have squeezed every bit of >>speed out of my quick 0x88 version, but it was slower than my current bitboard >>version especially for generating only captures (which is more important than >>the "moves generated/sec" statistic in my opinion). >> >>Basically I can do around 850k times/sec a GenerateCaptures(). I didn't manage >>that with 0x88. >> >> >>Regards, >>Bas Hamstra. > >I, too, find that bitboards are somewhat faster than 0x88, but not enough >faster that that should be a prime consideration (it's what first sold >me though...). What I really like is that bitboards eliminated two things >that I didn't like in my 0x88 programs: > > 1) 0x88 board coordinates, which, if used in the "raw" form, tended > to bloat up arrays (like the history heuristic table). Re-mapping > 0x88 coords to 64-square coords costs a bit. > > 2) The piece list--which was always a bother. > >-Dan. Piecelist - agreed :) With the BB's you just throw a rook in a pool and can forget about it. Very easy. BTW for your program: after e4 e5 Nf3 Nf6 Nc3 Nc6 Bc4 Bc5 (if you want to share of course) - how many times a second can it do a capturegen()? Here 800k/sec. - what number of moves/sec (all moves) doest it gen in this pos? Me 12M/sec. Regards, Bas.
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