Correct answer: Rg8-g7 1.Rg8-g7 ! zugzwang. 1...Bf4-c1 2.Nf5-g3 # 1...Bf4-d2 2.Nf5-g3 # 1...Bf4-e3 2.Nf5-g3 # 1...Bf4-h2
