Correct answer: Bf1-h3 1.Bf1-h3 ! zugzwang. 1...d3-d2 2.Qc3-c4 zugzwang. 2...Kd1-e1 3.Qc4-f1 # 1...Kd1-e2 2.Qc3-c1 zugzwang.
