Komodo 10.1 generally promotes more often than Stockfish dev, an important thing in itself, but underpromotes almost an order of magnitude less:
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Komodo SF dev
promotions promotions
(under-pr) (under-pr)
2484 1901
(18) (141)
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Komodo SF dev
a8 482(0) 357(17)
b8 320(4) 261(12)
c8 279(3) 227(17)
d8 220(3) 168(19)
e8 216(3) 175(20)
f8 286(3) 184(16)
g8 322(2) 227(16)
h8 359(0) 302(24)
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Komodo: N=9, B=4, R=5
SF dev: N=35, B=13, R=93