Author: Gian-Carlo Pascutto
Date: 07:15:13 05/28/01
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On May 28, 2001 at 06:33:06, Cheok Yan Cheng wrote: >By the way, has anyone make an experimental test on the speed of bit board vs >array board? How are you going to do this? The board structure has implications in the whole program. You would have to write an identical program using both bitboards and array boards, each fully optimized to use all tricks allowed by one of the implementations. You will run into trouble with the eval for example, where some things are very fast with bitboards and others are very fast for array boards. A real program will probably try to avoid using the slower eval term unless it really has to, whereas it can be a nearly free addition in the other. How are you going to compare this? You could look at the top programs and conclude that all except crafty are array/attackboard based, but most of them have been in development for a long time, from before bitboards were well- known. Maybe if those top programmers had to restart now they would use bitboards, then again maybe not. That said, I think it's safe to say that bitboards wont be very efficient if you aren't dealing with 32 or 64 square boards. -- GCP
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