Correct answer: Qa71...Nd4 2.N:f4# 1...Qc5/Qc6/Qc7/Qc8 2.N:c5# 1...Q:b3 2.B:b3# 1.Nd2?? (2.B:c4#/N:f4#/Nc3#) 1...Nd4 2.Q:d4# 1