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Muller, to get piece values at ~3% exactitude you would need to presuppose
that piece values are static properties. But they are really changeable
with regard to tactical and strategical context. This means that you would
probably have to foresee the future in, say, ten moves in order to get a
~3% exactitude. One obvious example is XiangQi. Chinese Chess masters are
hard pressed to reveal the relative values of pieces. Those pieces which
are completely lousy, like the elephant and the mandarin, are sometimes
very valuable while they provide protection for the general, function as
screens for the cannon, or can block enemy pieces. So, in a certain
context they become very valuable. Ten moves later, the elephant or
mandarin is useless. Probably, in chinese chess, only a human is capable
of evaluating a piece.
/Mats