Correct answer: Rg2-g1 1.Rg2-g1 ! zugzwang. 1...Kh5-h6 2.Kf4-f5 zugzwang. 2...Kh6-h5 3.Rg1-h1 # 1...Kh5-h4 2.Rg1-h1 #
