Daily chess puzzle: Check Mate #449

Another puzzle from Dragoslav Andric’s 1981 book “Matni Udar”. 

 White to play and mate Black. 

(I don’t know why my app insists on putting a spot on h3, which I couldn’t get rid of. The square isn’t relevant to the solution). 

Sindik v Cebalo, Zagreb 1978

Solution 

Clearly, the aim is to overload the Qb6, and either 1 Rc6? or 1 Rb4! are the natural tries. The former fails after 1…Bc6 2 Qd6+ Kg8 and the black king slips away. But 1 Rb4! and if 1….Qc7 2 Rb7!, since the Q is tied to defending d8: 1-0

FEN 

5k2/1b3pr1/pq1b1Q2/4p3/2R1P2P/8/1N6/1K3R2 w – – 0 1