Since I "burnt" the complete question elsewhere, let's start with "D" (I counted up in hex) and 8 moves. The position in the answer there can be improved by far! OK, to recapitulate: Legal position, no promoted material, as many pieces as possible, each piece has 8 legal moves, ties broken by proof game length.
2 Answers
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$\begingroup$ Nice one. It's a pity that you can almost fit in one more black knight on e3 there. $\endgroup$– justhalfCommented Jun 8, 2021 at 6:15
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$\begingroup$ @justhalf or on c5 for that matter. $\endgroup$ Commented Jun 8, 2021 at 7:29
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2$\begingroup$ Great! A shame that Re2 (then +Nc5) doesn't work either. "Uppie" pending, maybe someone does 21. $\endgroup$ Commented Jun 8, 2021 at 9:14
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$\begingroup$ Wait, why doesn't it work? Edit: Ah, the white king. $\endgroup$– justhalfCommented Jun 9, 2021 at 9:59
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Let's open the challenge (without a proof game, since I already know a solution with more pieces is possible)
16 pieces
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$\begingroup$ Nice start, especially as usually the knights kick the kings hard. (Consequently, my current record attempt has none...but I'm confident it can be beaten.) $\endgroup$ Commented Jun 6, 2021 at 11:44