Correct answer: c8Q1.c8R?? (2.Rc5#) 1...Ra8/R:b6 2.R:a8# but 1...Ra7! 1.c8Q! (2.Qc5#/Qc3#/Qf5#) 1...Ra7 2.b:a7# 1...Ra8/R:b6 2.Q:a
