Daily chess puzzle: Check Mate #462

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

Starke v Okrajek, Leipzig 1979
Solution 
Given it is a problem, 1…Rc3! has to be the initial move: 2 bc[] and the Qb3 is cut off, permitting 2…Be3! and Qh3-Qg2 can’t be prevented. 

I would say it is an odd position, since Black is already a piece up, so really ‘anything wins’.
FEN 
2r2rk1/7p/3p2nb/p2Pp3/1p2P2q/PQ3bN1/1P3N1P/R4RK1 b – – 0 1