Author: Robert Hyatt
Date: 07:54:23 05/28/01
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On May 28, 2001 at 01:40:52, Cheok Yan Cheng wrote: >For a game that used 8x8 board like chess, we can use the bit board >representation by using a 64 bit sized variable. However, for the game that used >board sized 9x10 like chinese chess, is it possible to use bit board >representation that need 90 bit sized variable (where can i get a variable sized >90 bits ??) > >thanks bitboards will work ok there too, just more work. Chess 4.x ran on a 60 bit machine, yet used 64 bit bitboards by breaking them into two pieces. Crafty runs on 32 bit machines yet uses 64 bit values which turn into two instructions on a PC. Contrary to popular legend, you don't _need_ a 64 bit machine to use 64 bit words... it is very hard to keep a modern 3-4way superscalar architecture busy in all the pipes... this approach makes it easier.
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