Stockfish 10 Has Hit the Streets

     The 10th anniversary version, Stockfish 10, has been out a few days. It's supposed to be 50 Elo points higher than version 9 when playing head to head. 
     The 50 point rating increase means (at least among humans) that the higher rated player's win expectancy percentage is 57 – 43. 
     I noticed its default contempt value is 24; Stockfish 9's was 20. 

     Contempt can be thought of as “optimism.” It's how many centipawns better one side stands. With the higher contempt factor it will go for risky lines in which it may be fighting to hold the draw, but at the same time it might get a positional win. By way of comparison Komodo 10's default contempt factor is 10. Practically, this means Stockfish's evaluation is almost always higher than the other engines...it's more optimistic.
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