Correct answer: Kd11...Kd5/d:e3 2.R:d4# 1.b5?? zz 1...d:e3 2.Rd4# but 1...Kd5! 1.Kc1?? zz 1...Kd5/d:e3 2.R:d4# but 1...K:d3! 1.Kb2?? zz 1...Kd5/d: