Rd5. In keeping with the Novotny move! It threatens RxR leading to mate after QxR, QxQ The rook can be captured by black rook, queen, bishop or pawn though If captured by rook, it cedes control of e8, so Qe8 is mate If captured by queen, it codes control of f6, so Qf6 is mate If captured by bishop or pawn, QxR is mate as the black queen is blocked from protecting its own rook!
Maybe this interference tactic is not so rare, maybe this even a heart of the chess, but it is very difficult to recognize. There checkmate on the way, but can you see it when there only a little positional improvement?
Why can't you just capture on f7? If they take your rook then C5 capture means QG7 is mate. If they Move the rook to R8 then captures and rook C8. I get the puzzle is rook D5. But if you capture F7. The best move I see is bishop G6. Still leads to pawn takes G6 if they don't capture Qh6 is mate. So rook takes G6. Still can't move the queen or G7 is mate. Rook gets taken if it attacks the queen. So swing the rook to G5 and it's GG. No need to be fancy really. Why risk losing material.
