Correct answer: Bb31...Kd4 2.Nb3#/Nf3# 1...Kd6 2.Nf7# 1.B:e7+?? 1...Kd4 2.R:f4#/Q:f4#/Ne2#/Nb3#/Nf3#/Nc6# but 1...Kb6! 1.b4+?? 1
