I often see 65% of draws using 2 moves opening book.
Hopefully the draw ratio versus other engines is still correct (~20%) so that a little tourney gives reliable and quite quick results.
But before going to a tourney I always like to run a little head-to-head self test.
Because a little tourney takes at least 2 days, including 3 or 4 versions of Minic and 6 to 10 other engines, running 7 concurrent games at TC40/20sec).
SPRT seems to not help much here, but I may not be using it right ...
Let's look at today example (still running...):
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Score of minic_0.86 vs minic_dev: 75 - 96 - 316 [0.478] Elo difference: -15.0 +/- 18.3, LOS: 5.4 %, DrawRatio: 64.9 %
A connected question might be, what are the odds to see a +25 +/-20 (looks good to me) become a 15 +/-18 (look less good to me ...) that's what I saw today ...