Daily chess puzzle: Check Mate #139

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

Black to play and mate White

Koch v Zollner, Munich 1938

Solution

Since it is a problem in a puzzle book, you have to look at 1…Ra2! and calculate 2 Na2. I chose 2…Qa3+ 3 Kb1[] and tried to make 3…Qa2+ work, but 3…Qa2 is ??; instead 3…Nb3! or better  2…Nb3+! is the way to win.

If 3 cb then 3…Qa3+ and it is easy; or 3 Kb1 Nd2++.

FEN

rr4k1/2p2ppp/5n2/4b3/1q1n2P1/1PNB3P/P1PB2Q1/2KR3R b – – 0 1