Author: Helmut Conrady
Date: 11:58:36 12/12/05
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On December 12, 2005 at 14:39:20, Álvaro Begué wrote: >On December 12, 2005 at 14:07:17, Dann Corbit wrote: > >>On December 12, 2005 at 14:01:45, James Constance wrote: >> >>>When a tablebase says that a position is a win in more than 50 moves does it >>>take into a account the 50 move rule i.e. that a piece has been taken or a pawn >>>moved? >> >>No. But it's trivial to count it yourself. > >It's not that trivial. If your database gives distance-to-mate values, it is in >possible in principle that it will spend over 50 moves without making a pawn >move or a capture, which results in a draw. A good database should know about >distance to an irreversible winning move, and consider anything with a distance >over 50 to be a draw. Then you can try to win faster if you want. I don't know >if any tablebases currently available do this correctly, but in practice it will >probably not matter. There are databases structured by "DTZ 50" (*d*istance to *z*eroing *m*ove after every sequence of 50 moves) built e.g. by Rafael Andrist or Dieter Bürssner, which take the 50-move-rule perfectly into account. Helmut
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