Author: Laurens Winkelhagen
Date: 06:16:58 11/22/04
Go up one level in this thread
On November 22, 2004 at 07:53:27, Steve Coladonato wrote: >On November 22, 2004 at 05:49:05, Laurens Winkelhagen wrote: > >>On November 21, 2004 at 19:49:42, Steve Coladonato wrote: >> >>>On November 19, 2004 at 15:45:51, GuyHaworth wrote: >>> >>>> >>>>Confirmed: Marc has done KRPKBP and Eugene has done 19+ 3-3p EGTs but not this >>>>one. >>>> >>>>1-0 maxDTM = 166 wtm and 153 btm: 0-1 maxDTM = 103 wtm and 104 btm. >>>> >>>>g >>>Guy, >>> >>>I'm not familiar with tablebases and I don't understand your score. I am >>>reading it this way: maxDTM = Max depth to mate >>> wtm = white to move >>> btm = black to move >>>What I don't understand is the 1-0 and 0-1 score. Could you explain it for me? >>> >>>Thanks. >>> >>>Steve >>My guess: >> >>Because there is a difference between the white and black side, it makes a >>difference which side mates. The above score tells us that the biggest maxDTM is >>when the white (KRP) is to move and to win. >> wtw btw >>wtm 166 103 >>btm 153 104 >> >>It seems logical that if black (KBP) is to win, then the mate should be shorter, >>because one may not give white a chance to take the pawn with the rook. >>Obviously this is easier when the pawn is closer to promotion. >> >>One puzzling thing left is that it makes a big difference for white to mate if >>black is to move or white is. One would expect only a difference of 1, not of >>13. It probably has something to do with going over into a different tablebase? >> >>Regards, Laurens > >Laurens, > >I thought the purpose of the tablebases was to provide "best" move evaluation of >a position. In which case, only one side [either white or black but not either] >would win or it is a draw. I suppose the starting position could enter into >which side will win and perhaps that is why the above shows statistics for >either side winning. > >Steve Hi Steve, I'm not sure if I understand you correctly, so I don't know if this reply will make sense to you, but: tablebases only tell only one side of the story: there is a KRPKBP tablebase but there won't be a KBPKRP tablebase. The board is flipped appropriately. There are obviously positions where KBP will win over KRP, which is why there are both maxDTM for 1-0 and for 0-1. There wouln't need to be 0-1 maxDTM scores when there would be a seperate KBPKRP tablebase, but there isn't;-) Hope I make sense, Laurens.
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