Author: Shane Booth
Date: 04:19:39 11/17/98
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On November 17, 1998 at 06:35:08, Ralph E. Carter wrote: >Has anyone projected the size of these? Big, really big :-) Lewis Stiller produced many 6 piece pawnless tablebases a few years ago. There were just over 6 billion positions, so at one byte per position you get 6Gb. Although one byte per position is almost not enough, as a number of positions require over 200 moves to convert (For example, in the KRBKNN and KRNKNN endgames). 7 piece pawnless endgames will be about 64 times the size of 6 piece endgames, so we get 300-400Gb for 7 piece endgames and about 20 terabytes for 8 piece endgames. Of course, with compression you might reduce these figures by an order of magnitude, but this still leaves 6 piece tablebases pretty big and 7-8 piece ones huge. Of course if there is a pawn on the board, you can multiply the estimates by about 3. Shane
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