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Subject: Re: Distance-to-mate vs Best-move tables

Author: J. Wesley Cleveland

Date: 12:55:48 10/24/01

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There appears to be confusion between the two uses of egtb tables. One is in the
search where you need to know the value of the position (mate in 37, draw,
etc.), though for practical play win, draw, or loss is enough. The other is at
the root where you need to know which move to play.

In the search, Best-move tables would be completely impractical, but a related
idea might work very well:
Have an evaluator that predicts the score, win, draw, or loss, and a table that
indicates correct, or has the real score. With a good evaluator, this table
should compress *extremely* well. For many unbalanced tablebases, e.g. KQQQk,
you would not even need the table (i.e. compress it to zero bytes).

At the root, Best-move tables could work well.



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