Correct answer: R:f71.Rf1[A]? zz 1...f6[a]/f5 2.Kc2#[Б] but 1...K:a2! 1.Kc2[Б]? zz 1...f6[a] 2.Rf1#[A] but 1...K:a2! 1.R:f7! zz 1...K:a2 2.Ra7#
