I had 3 moves. 1. RxR NxR 2. Ne8+ BxN 3. Qd8# The 2 move solution...obviously better.
Simple yet elegant.
It took me a while to see this stunninbg 2-move combo,
again failed to solve...........
Interesting thought process here. Once you see this mate-in-3, the mate in 2 solution (which uses much the same mating situation - Queen, protected by the d1 Rook, mates on an adjacent-diagonal square) becomes all the more obvious, But once we see a sure-fire forced mating combo, it is hard to shift and look for something better. Only if we are told there is a "mate-in-2" solution do we look any burther,