Correct answer: Qf1-f2 1.Qf1-f2 ! zugzwang. 1...d4-d3 2.Bf7-e6 danger: 3.Qf2-e3 # 1...Ke4-d3 2.Qf2-c2 # 2.Qf2-f3 # 1...g6-g
