Author: Robert Hyatt
Date: 12:49:14 10/11/99
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On October 11, 1999 at 14:44:27, J. Wesley Cleveland wrote: >On October 11, 1999 at 09:08:46, Robert Hyatt wrote: > >>On October 11, 1999 at 03:55:14, blass uri wrote: >> >>>On October 11, 1999 at 00:01:56, Robert Hyatt wrote: >>> >>>>On October 10, 1999 at 21:17:44, Ted Sutton wrote: >>>> >>>>>How can one either generate or download from a web site a particular 6-man >>>>>tablebase: either for the appropriate forces, e.g., B+P vs. R+P, or better yet, >>>>>for an particular position? >>>> >>>> >>>>No, except for a couple of rare exceptions. The files are _much_ bigger than >>>>you realize. IE B+P vs R+P will be well over 4 gigs. >>> >>>It depends on the original position. >>>If the pawns are blocked in the original position and you generate tablebases >>>only for future position than it will be clearly less than 4 gig. >>>If you have all the 5 piece tablebases than the future position that you do not >>>know the outcome of them are only future position when you change the place of 4 >>>pieces(2 kings and rook and bishop). >>> >>>Uri >> >> >>we don't have any code to produce 'partial' files, nor do we have any code to >>probe it. Nor do we have any engine that does a test to see if it is in a >>special-case ending. I don't see any reasonable use for partial files, except >>for a specific game. The files take too long to build for a specific game, and >>the size is still significant, since the very symmetric files we already have >>are 400mb+ in size. Adding pawns, even blocked ones, removes one level of >>symmetry that can be used. > >If you think about it, any 6 piece ending with specific blocked pawns would have ><16M positions uncompressed. Sure... but how many unique cases are there? :) 16M * N is big if N is big. and with a single pawn being on 48 different squares, and the blocking pawn being in front, 16M * 48 cases doesn't look real attractive. Not to mention the work someone has to do to modify the generator to work like this. '
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