Correct answer: a31...Ke3/Ke5 2.Qe4# 1.Nb3+?? 1...Ke3 2.Qf3#/Qe4# 1...Ke5 2.Qe4# but 1...Kc3! 1.Nc2+?? 1...Ke5 2.Qe4# 1...K<