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Millipawns, (Milli-pawns)
a score unit which corresponds approximately to one thousandth of a pawn unit. Fixed point representation with millipawn fractions allows a smooth relation of all piece values with a finer granularity than centipawns to distinguish positional scores.
Millipede [1]

Doch

Don Dailey on the evaluation grain in Doch [2]:
The key thing to understand is that chess programs compare positions better than they evaluate them. Since most of the positions you compare are very similar (most of the pieces are sitting on the same squares) even a tiny difference can distinguish one similar position from another and even do it correctly. Even though neither position may have a very accurate evaluation, your evaluations function is more likely than not to pick the best one of the two given a choice as it will likely have more of something "good" in one of them, or less of something "bad".

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References

  1. ^ Photograph of a millipede taken by Eric Guinther on O'ahu, Hawai'i, Trigoniulus corallinus - Wikimedia Commons
  2. ^ Re: Centipawns and Millipawns by Don Dailey, CCC, September 08, 2009

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