Correct answer: Nf41...Nc3/Nc7/Nd6 2.B:a7# 1.Ka4?? zz 1...Nc7/Nd6 2.B:a7# but 1...Nc3+! 1.R:a3?? zz 1...Nc3/Nc7/Nd6 2.B:a7# but
