Correct answer: Nd31.f5+?? 1...Kf6 2.Nf3#/Nf7#/Ng6#/Nd3#/Nd7#/Nc6# but 1...B:f5! 1.Nf7?? (2.Qe5#/Nd8#) 1...Bd3/Bg6 2.Qe5# 1...c:d6