Correct answer: Nd41...K:f6 2.Qg7# 1.Rb5+?? 1...K:f6 2.Ng4#/Qg7# 1...c:b5 2.Qc3# but 1...c5! 1.R:b7?? zz 1...K:f6 2.Qg7# but 1...c5! 1.h5?? zz