Correct answer: Qb61...Nd2/Nd6/Ne3/Nb2/Nb6/Na3/N:a5 2.Nd7# 1.Qb6! (2.Nd7#) 1...Kd5 2.Qd6# 1...Kf5 2.Qf6# 1...Kd4 2.N