Correct answer: Q:f71...Ne4/Nc4/Nb1/Nb3 2.Nc4# 1...Ng3/Ng7/Nf4/Nf6 2.Qf4# 1.Q:f7! (2.Qe6#) 1...Kd6 2.Qe7#/Qd5# 1...N