Correct answer: R:b21...b1N 2.Qc1# 1.Rb3+?? 1...Kc4 2.Q:d4# but 1...Kc2! 1.Rc4+?? 1...K:c4 2.Q:d4# but 1...b:c4! 1.R:d3+?? 1...K:d3 2.Q<