Author: Sanjiv Karnataki
Date: 01:48:12 12/28/99
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Bruce: Thank you for the answer. Do you by any chance know where I can find more information on this subject? particularly the generation/format of tablebase files (nalimov). thanks again. On December 28, 1999 at 04:22:39, Bruce Moreland wrote: >On December 28, 1999 at 01:49:09, Sanjiv Karnataki wrote: > >>Hi All, >> >>I have read about tablebases and I like the way Crafty (Crafty rules !) uses >>them to play perfect endgames for 3/4/5 pieces. I wanted to know a bit more >>about them, how they are generated and the format of the tablebase files but >>cannot find any article (first time yahoo, and altavista have failed me). The >>only link i have found seems to be defunct. (chess.onenet.net, SJE's >>tablebases). >> >>Thanks in advance > >They are generated by working backwards from known positions. Every conceivable >position is examined, and those where one side is checkmated are marked as mates >in zero. Then every position is examined again, to see if the side to move can >reach a mate in zero position, and those are marked as mates in one. Then every >position is examined again, to see if it is impossible to avoid moving to a mate >in one position. Then every position is examined again, to see if it is >possible to reach one of the positions from which it is impossible to avoid a >mate in one, these are mates in two. This is done repeatedly until it's >impossible to create any deeper mates, at which point everything left over is >determined to be a draw. > >I have oversimplified but essentially this is what happens. > >bruce
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