Correct answer: Nf3-d2 1.Nf3-d2 ! danger: 2.Nd2-b3 # 2.Qc2-b1 # 1...e2-e1=Q 2.Nd2-b3 # 1...e2-e1=R 2.Nd2-b3 # 1...f2-f1=