Correct answer: c51...Rb1/Rb3/Rb4/Rb6/Rb7/Rb8 2.Nc2# 1...Rb5/Rc2 2.N:b5#/Nc2# 1...Ra2/Rb:d2 2.Nb5# 1...Rf5 2.N:f5# 1...Re2/
