Author: Dan Newman
Date: 11:12:57 08/28/98
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On August 28, 1998 at 13:44:01, Larry Coon wrote: >On August 28, 1998 at 05:35:47, Dan Newman wrote: > >>>1. Is it safe to assume that "qsf" (queenside)and "tri" >>> (a1-d1-d4 triangle) indexing are never used in the >>> same tablebase file? >> >>Yes, that's my understanding too. When there are only pieces on >>the board there are more symmetries to play around with than when >>there are pawns, so we can use the "tri" indexing for one of the >>pieces. Since pawns are highly directional you lose a lot of the >>symmetry and must go to "qsf" indexing--which gives less than >>a third of the "compression" that "tri" gives. > >Makes sense. So the general rule would be: > -- If there are -any- pawns, there will be one "qsf" (on > a pawn) and the rest will be "all." > -- If there are -no- pawns, there will be one "tri" (on > the last black piece) and the rest will be "all." >Sound better? > Yes, I think that's it. (But, what if there are two pawns; which gets the "qsf" index? My vote is: the last one.) -Dan.
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