Correct answer: Ra31...Kc4 2.Ra4# 1.Kf5?? zz 1...Kc4 2.Ra4# 1...c4 2.Rd5# but 1...f6! 1.Ra2?? zz 1...Kc4 2.Ra4# but 1...c4! 1.Ra1?? zz 1...