Author: Tony Werten
Date: 00:27:16 08/27/05
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On August 26, 2005 at 17:01:16, Robert Hyatt wrote: >On August 26, 2005 at 16:55:28, Dan Honeycutt wrote: > >>On August 26, 2005 at 16:36:47, Dan Honeycutt wrote: >> >>>On August 26, 2005 at 16:15:47, Robert Hyatt wrote: >>> >>>>On August 26, 2005 at 16:11:53, Dan Honeycutt wrote: >>>> >>>>>Run the lowest bits down the a or h file and you can do pawn captures without >>>>>having to mask those files. >>>>> >>>>>Best >>>>>Dan H. >>>> >>>> >>>>How would you avoid masking? Otherwise the pawn at h2 would still wrap to a3 on >>>>a shift... >>> >>>h8 = bit 0 >>>h7 = bit 1 >>>: >>>a1 = bit 63 >>> >>>If I ran that the right way, the out of bounds bits are lost and 0's are shifted >>>in on the other side. >>> >>>Best >>>Dan H. >> >>Looking at it, I think that's right. Take white pawns on g4 and h4 with >>captures to the right. g4 is bit 12 and h4 is bit 4. My shift is 9 left, so g4 >>lands on h5 (bit 3) and h4 is discarded. >> >>Best >>Dan H. > > >The problem is that all 64 squares are represented by one bit. So no matter >what you do, a pawn on the edge is going to wrap around to the other side of the >board... Because all 64 bits are shifted at once... > >Are we talking about the same thing here??? The idea is to limit the wrapping around to pawns on the 1st or the 8th rank. Big change nothing will wrap around :) Tony
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