Correct answer: Rf31...Ka4 2.Nc5# 1.Rf3! (2.Nf2#/Nf6#/Ng3#/Ng5#/N:d2#/Nd6#/Nc5#) 1...Ka4/c5 2.Nc5# 1...Kc4/Rf8/Nf6 2.N