Correct answer: Kd41...Kb7 2.Nc5# 1.Kd4! (2.Nf2#/Nf6#/Ng3#/Ng5#/N:d2#/Nd6#/Nc3#/Nc5#) 1...Kb7/Bc5+ 2.Nc5# 1...b4 2.Nd6#/N