Correct answer: Kd1-c1 1.Kd1-c1 ! zugzwang. 1...Bd8-a5 2.Bb4*e7 # 1...d3-d2 + 2.Kc1-d1 zugzwang. 2...b7-b6 3.Kd1*d2 zugzwang.
