Author: Robert Hyatt
Date: 09:00:03 01/26/03
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On January 26, 2003 at 11:55:27, Antonio Dieguez wrote: >On January 26, 2003 at 10:34:51, Robert Hyatt wrote: > >>Fen starts from the last rank because, by standard, chess boards are displayed >>with white on the bottom. It is more natural to read left to right, top to >>bottom, which means a8-h8, a7-h7, ..., a1-h1 >> >>It was done for simplicity and nothing else. > >Hi, still, I don't know if you don't loop too much, with your magical bitboards, >but with other repr one would like to increment the position when moving forward >with white so it has its simplicity there. you can still do that. Just let the LSB = a1, rather than the MSB. Then you can use native BSR/BSF instructions that will return the right number... Or the LSB could be h1 and go up from there if you want to be able to "visualize" things a bit easier. In Crafty, I have symbolically named each bit with a typedef, so changing this is not all _that_ hard, and I am probably going to do it one day before long simply to make BSF/BSR more useful.
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