Correct answer: Ra21...Nd1[a] 2.R:d1#[A] 1...B:d4/[б]/ 2.Rc3#[Б] 1...Nh2/Nh6/Nf2/Nf6/Ne3/Ne5 2.Nf2# 1...N:c4 2.O-O-O# 1...Bc5/Bc7/Bd8/