Author: Sergei Smith
Date: 07:32:23 11/13/01
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On November 13, 2001 at 10:09:30, Robert Hyatt wrote: >On November 13, 2001 at 08:31:09, William Penn wrote: > >>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". > >How would you handle all the common zugzwang positions? black king at e6, >white king at e4, white pawn at e3. White to move draws. Black to move >loses. > > >> 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. > >There are plenty of positions where underpromotion is the only way to avoid a >stalemate. That would convert many wins into draws. > > > >> Perhaps castling can be disregarded because it seldom happens in >>the endgame. > >castling is already ignored and not part of the tables. > > >> 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 > > >eliminating 1/2 the tables cuts it to 3.75 gigs. None of the other changes >you suggest are doable. And eliminating either wtm or btm will cause problems >as I mentioned. > >7.5 gigs is a trivial amount of disk space today, with new machines usually >coming with at least a 60 gig drive. Do you think it will ever be possible in the distant future to have tablebases with 7 pieces , 8 pieces , ... ?
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