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Subject: Re: Endgame tablebase format

Author: Steven J. Edwards

Date: 21:13:47 06/13/98

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On June 13, 1998 at 23:47:15, jonathan Baxter wrote:

>>A position is folded via one or more of X, Y, and x=y rotations until
>>the non-default flavor subscript man is in the restricted (32 or 10)
>>square field.
>
>Do you mean *reflections* rather than rotations?

A rotation though 3-space.  Assume that the x axis runs between ranks
four and five and the y axis runs between files d and e.  The three
transformations are:

1) x' = -x

2) y' = -y

3) x' = y; y' = x

>If you are interested, I am trying to train an evaluation function
>directly
>using the tablebases.

Please post your results.  Others have tried this before, but all
attempts to come up with a completely accurate (if imprecise) function
have generated functions more complicated (time wise) than a simple file
probe.

-- Steven (sje@mv.mv.com)



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