Author: Gerd Isenberg
Date: 07:24:15 10/30/02
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On October 30, 2002 at 08:47:34, Heiner Marxen wrote: >On October 30, 2002 at 07:50:53, Gerd Isenberg wrote: > >><snip> >>>>int looprichting[7][64][64]; >>>> >>>>of course only elements 1..5 get used practical for this check >>>>generation so it is: >>>> 5 * 4096 * 4 = 80KB >>> >>>It might be worth it to convert the 2 squares to 0x88 representation here and >>>only need 5 * 239 * 4 = 4.78 KB ? >>> >>>Tony >> >>Hi Tony, >> >>That looks interesting. Can you help me a bit to understand the 239? >> >>Thank in advance, >>Gerd > >That is 0x77*2 + 1. Feel better now? :-)) > Yes, great, Thanks Heiner! >With 0x88 coordinates (minimum used value = 0, maximum = 0x77 (inclusive)) >one interesting property is, that the difference of two such values uniquely >determines the geometric relationship. >Hence, a table covering all possible differences is enough. > >What differences can occur? (0..0x77) - (0..0x77) --> (-0x77 .. +0x77) >That range turns out to be 239 (== 0xef). > >I use this property in Chest. > >Cheers, >Heiner It seems, there is something to improve in IsiChess. Btw.: I missed the 2.BELTC as a preparation for the DutchOpen this year :-) Cheers, Gerd
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