Correct answer: g5-g6 1.g5-g6 ! zugzwang. 1...Qf2-f8 + 2.Bg7*f8 # 1...Qf2-e1 2.Bg7-b2 # 1...Qf2*g1 2.Bg7-b2 # 1...Qf2*h4
