Since I was able to solve R2 on both sides, I now wonder if this one was also meant to be solved on both sides (I've so far solved it only on one side, in the set number of moves, which is currently 94, on the other side I can only do 96).
While I got 96 on both sides very quickly, and it also quickly became apparent which side had the trick, actually finding the optimization was very difficult. Fantastic level.