Author: Robert Hyatt
Date: 08:43:53 02/02/05
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On February 02, 2005 at 05:32:00, George Tsavdaris wrote: >On February 02, 2005 at 01:06:30, Robert Hyatt wrote: > >>On February 01, 2005 at 21:39:40, Anthony Cozzie wrote: >> >>>Is there any chance of some 6-man tables becoming available before CCT? My wish >>>list is actually pretty small: >>> >>>KRPKRP (only the white-side is available from Bob right now?) >> >>think about it. If pieces are symmetric you only need one side. Just turn your >>white pieces into black ones, and the black ones into white ones, and look it >>up. :) > > Actually, this is what i thought the first time i saw there are tablebases for >white and for black, for the same endgame(KRPKP for example). So i thought they >would have the exact same size. But no, this isn't happening. >For example KBBKNBB.EMD is 200 KB, while KBBKNBW.EMD is 243 KB. >Can you explain why..........????????? It seems very bizarre to me!?!?!?!?! Yes. Give a position for white to move with white having more material. Then same position with black to move. If it is a mutual-zugzwang position, one can have a long winning path, while the other has a short drawing path... Positions with more draws compress better as there are more zero values in the file. Positions leading to mate have lots of n, n-1, n-2, n-3, etc type mate scores which don't compress very well. The tables have to contain a pretty fixed number of positions, but the larger the table, the more mates there are. A KK table would be just a few bytes long, for example. All scores would be 0 and that would compress like crazy. :) > >> >> >>>KRPPKR >>>KQPKQP >>>KQPPKQ >>>KRKPPP >>>KNPPKR >>>KBPPKR >>>KBPKNP >>>KRPPKQ >>> >>>There are a few others that I wouldn't mind having, but those are the really >>>useful ones that come to mind. I guess the above would total 30GB or so, which >>>is a fair bit but not completely outrageous. >>> >>>anthony
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