Congratulations for this great analysis!
What a game, that pushes Sprouts some levels up!
Move 40 is exceptional, I can't find a winning move in S(11) of nim-values 3^4, an *5 would be enough but I don't think it exists and I don't know what other strange animal could match the *3+*3+5^1.
The following defense on the razor's edge is really brave!
Please send updated tables of nim-values of simple positions if AuntBeast spots errors as I won't.
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Jeff
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Jean-François