Correct answer: f:e71...K:c7 2.b8Q# 1.B:e7+?? 1...K:c7 2.b8Q#/Na6# but 1...Q:e7! 1.c8Q?? (2.b8Q#/b8B#/Qc6#) 1...Nd5 2.Qc6# 1...B<