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Subject: Re: Chess program improvement project (copy at Winboard::Programming)

Author: Richard Pijl

Date: 00:49:47 03/07/06

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>If one's results do not rotate approximately as described
>for the four positions and you say the evaluation is an
>issue, what kinds of evaluation issues have you seen that
>could explain it?!?

I had this problem long time ago in the Baron as well. To be able to detect
these issues I created a little tool that reads a large PGN file, and for every
position in the PGN file calls the static evaluation function for that position
mirror the position and call static eval again. Whenever that didn't give
exactly the same score for both positions, I print both fens, and continue.
Usually, if there is an evaluation mirroring bug, it doesn't take long for it to
find it.

Richard.



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