Correct answer: Bd31...Nc4/c4 2.Bf3# 1...Na:c6/Nd:c6/b:c6/d:c6 2.R:d7# 1...d6 2.e6# 1.c4+?? 1...Kd4 2.Qf4# but 1...N:c4! 1.Qe4+?? 1...Ke6 2.N:c5#