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I've heard that the most common evaluation unit is 1/100 of a Pawn. But some engines use 1/1000 of a Pawn as their evaluation unit.

I've also heard that Stockfish used 1/256 of a Pawn as its evaluation unit (although it was 5 years ago, maybe it has changed today).

So what about the strongest and best-know chess engines: Komodo, Houdini, Fritz, Hiarcs, Gull, etc... what evaluation unit do they use?

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Chess engines use centi-pawns.

https://chessprogramming.wikispaces.com/Centipawns

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    Worth noting that all engines (at least those supporting the UCI protocol or similar) report their scores in centipawns in order to comply, but that doesn't necessarily mean that they don't compute lines internally with greater precision.
    – DTR
    Nov 8, 2014 at 13:49
  • It's pointless to compute with greater precision. All engines use integer. Look at the Stockfish source code and you will see that I'm correct.
    – SmallChess
    Nov 8, 2014 at 20:06
  • I agree that Stockfish does, but it's not inconceivable that some other engine could find a use for that precision. As mentioned above, an earlier version of Stockfish used 1/256.
    – DTR
    Nov 9, 2014 at 9:50
  • Which engine uses that? Houdini? Komodo?
    – SmallChess
    Nov 9, 2014 at 11:01

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