Daily chess puzzle: Check Mate #474

Another puzzle from Dragoslav Andric’s 1981 book “Matni Udar”.  
White to play and mate Black

Vaisman v Stefanov, Rumania, 1979
Solution 
Again, as 471, Easy but difficult, in Jacob Aagaard’s terminology. 

1 Qf6!! is obvious, and probably doesn’t deserve the exclamation marks I have given it. 
1…gf[] 2 Bf6+ Bg7[]

and now the key move, 3 Rd7!!, after which everything falls into place. The main point is 3…Bf6 4 Rh7 mate. 3 Rd7!! does deserve the exclamation marks,

If 3…Qe5, then 4 Nf7+ forking the king and queen wins easily. 
FEN 
1qr1rb1k/pb4pp/1p3n1N/nN6/2p5/5Q2/PB3PPP/1BRR2K1 w – – 0 1s