Correct answer: Nf2-g4 1.Nf2-g4 ! danger: 2.Bf3*e4 # 1...e4*f3 2.Qg1-b1 # 1...d7-d5 2.Qg1*c5 zugzwang. 2...e4-e3 3.Qc5-c2
