Correct answer: R:f31...c1Q/c1R/c1B/c1N 2.N:f3# 1.Qf4+?? 1...Ke1 2.Qc1# but 1...K:c3! 1.Qd3+?? 1...Kc1 2.Q:c2# but 1...Ke1! 1.R