Author: George Tsavdaris
Date: 03:21:36 02/02/05
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On February 02, 2005 at 05:51:37, Eiko Bleicher wrote: >>>>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!?!?!?!?! > >There is only _one_ file for symmetric material like KRP-KRP. >But KBB-K is not symmetric, one side has two bishops, the other none. >They are of different size for two reasons: >1) The number of positions is different (because of some illegal posititions >(far from all) are filtered out. >2) The compression might give totally different results. > Hmm, i think that i have misunderstood what the files NBB and NBW do. I thought in my previous post and before, that XXXX-NBW has all XXXX positions solved and it is used when white side plays. While the XXXX-NBB has all XXXX positions solved and it is used when black side plays (So, since both NBB and NBW solve the XXXX we don't need both, as with mirroring tricks we can generate one from the other). Now that i see what i was thinking, i find it ridiculous! So now i've changed my mind from your post and i believe that NBB has all XXXX positions solved for BLACK, while NBW has all XXXX positions solved for WHITE. I'm still not sure if this is correct though....Actually i'm sure it is not correct this too:-( Can anyone tell me what the file X-NBW does and what the X-NBB...?
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