Correct answer: Na51...Ng1/Ng5/Nf2/Nf4 2.Bf2# 1...f4 2.Q:e4# 1...Rf7 2.B:e4# 1...B:d5 2.Qe3# 1.Q:f6+?? 1...R:f6 2.Be5# but 1...B:f6!
