Correct answer: Rf21...Kc4 2.Ne3# 1...K:c6 2.Ne7# 1.Rb7?? zz 1...Kc4 2.Ne3# but 1...K:c6! 1.Rb6?? zz 1...Kc4 2.Ne3# but 1...c:b6! 1.N:c
