Author: Omid David Tabibi
Date: 04:33:59 05/29/03
Go up one level in this thread
On May 29, 2003 at 00:17:14, Robert Hyatt wrote: >On May 28, 2003 at 14:59:57, Uri Blass wrote: > >>I am too lazy to look at the source code of crafty to try to find what >>formula is used by crafty for reducing the distance between the kings in >>endgames like KQ vs KR to help it to win without tablebases. >> >>what is the formula that is used. >>I decided to try something in movei and first tests suggest that it is slightly >>productive but I want also to know what crafty does. >> >>Uri > > >Distance is easy: >max(abs(rankwhiteking-rankblackking),abs(filewhiteking-fileblacking) > >#define FileDistance(a,b) abs(File(a) - File(b)) >#define RankDistance(a,b) abs(Rank(a) - Rank(b)) >#define Distance(a,b) Max(FileDistance(a,b),RankDistance(a,b)) > >I use the three #defines above... In Image Processing, assuming that a and b are two pixels, Max(FileDistance(a,b),RankDistance(a,b)) is called "chess distance" :)
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