Author: Greg Lazarou
Date: 17:44:59 03/22/99
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Do you really rotate them, or do you maintain the board in straight, 45 degree (diagonals), 90 degree and 135 degree angles throughout? Greg On March 22, 1999 at 18:29:07, James Robertson wrote: >On March 22, 1999 at 17:06:44, Dann Corbit wrote: > >>I understand that you can represent a chess board as a rotated bit sets. But my >>significantly stupid question is "Why rotate them -- what is the advantage?" > >To generate moves, you extract 8 adjacent bits from your 64-bit bitboard. This >works great for rank moves since they are already perfectly lined up. But if you >want to get file moves, you can't extract every 8th bit, and diagonal moves are >even worse. If you rotate the bitboard, you can extract file and diagonal moves. > >James
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