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Subject: Practical Tablebases (much smaller) ?

Author: William Penn

Date: 05:31:09 11/13/01


I suspect this has been discussed before but I didn't pay attention, so please
pardon my redundancy. If you could just point me in the right direction, much
appreciated...

Can't we make some assumptions without compromising very much practical playing
strength and significantly reduce the size of the endgame tablebases? For
example it seems a waste to generate separate positions for "white to move" and
"black to move". Surely there is a reasonable simplification in that regard
based on symmetry. Promotion of a pawn to less than a Queen is rare and could be
disregarded. Perhaps castling can be disregarded because it seldom happens in
the endgame. I suppose we must keep en passant(?). I'm guessing that the size
could be reduced to perhaps only 1GB for all of the 3-4-5 piece positions vs the
current 7GB. That would also make it more practical to generate 6-piece
positions. Anybody know how?
WP



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