Author: Uri Blass
Date: 15:43:11 10/17/03
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On October 17, 2003 at 17:12:35, Russell Reagan wrote: >On October 17, 2003 at 15:52:25, Russell Reagan wrote: > >>On October 17, 2003 at 06:24:37, Tord Romstad wrote: >> >>>If you bother to continue the e-mail exchange with the author, please >>>point out that all comparisons with "Zillions of Games" are completely >>>worthless. >> >>Don't worry, I have. Now he wants to have a little contest where I write an >>array based move generator for his game, and compare it with his. He claims to >>be able to generate 140 million moves per second on unknown hardware. I suspect >>he isn't actually converting the attack bitboards into moves, and thinking that >>the attack board comprises a "move list" (which it could, but you're only >>pushing the extra work outside of the "move generator"). Or he's doing something >>else which allows him to juice up his numbers. > >More from him... > >"The hardware was a 2.0 Ghz Pentium III. > >We have a routine that spawns positions from attack bitboards which are fed >through the rest of the program. This occurs at lightning speed." > > >Apparently he's doing some pretty nifty overclocking, because there are no 2GHz >PIIIs (the highest overclocked PII I could find was a 1.76GHz), and he has some >magic routine that "spawns positions" from attack bitboards, whatever that >means. Assuming he even has a 2GHz cpu, to get 140 million moves per second, >that's 14 cycles per move generated, doing 64-bit bitwise operations, on 32-bit >hardware. You may update incrementally information in your makemove like directions that pieces can go and number of squares that they can go to do the move generator faster(you will not need to check if a square is empty in your move generator). The question is if he does not pay by slower makemove when he does faster move generator. Note also that I think that relatively to chess data structure is less important because the game is more complicated so better pruning is more important. Uri
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