Daily chess puzzle: Check Mate #170

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

Cerendagva v Purevžav, 1949

Some form of back rent mate is clearly on the cards (in Purdy terms, White’s King is in a net) so…1…Bd4+! 2 Kh1

and now what?

It doesn’t take too long to see 2…Qd3

and after 3 Bd3 several checks: Nf2+ Nd3+ Nf2+ and finally Nd1+! blocks White’s rook’s sight of f1, so it mate next move.

5r1k/6bp/4Q1p1/3p4/Pp2n3/1q1N4/1P4PP/R4BK1 b – – 0 1