Author: Robert Hyatt
Date: 21:37:36 06/19/02
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On June 19, 2002 at 20:27:57, Dan Andersson wrote: >The move generation scheme seems to have been invented a lot of times. It would >be interesting to know where exactly the 0x88 name originated. We used to call >it 'Seven bit board' where we used it. That name came from our observation that >a sixty-four square board is adressed by six bits (2x3 bits really) but the out >of bounds checking was more efficient on 8x16 and 16x16 boards. Btw, I believe >Tiger uses an Eight Bit Board. > >MvH Dan Andersson It was around in the 1970's. I used it until roughly 1980/1981 when we changed to something that vectorized better (the cray had 64 word vectors so boards bigger than 64 words were not so good). I didn't originate the idea. I heard about it at a computer chess event. It might have been used in the 1970 program COKO but I am not certain. I had their source in the middle 70's... and I _think_ that is where I saw it, but that long ago, who knows. I do know that I first heard about bitmaps from Slate and Atkin... Although the Russian group (Donskoy, et. al.) apparently discovered them independently.
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