Correct answer: Ra11.Bb5+?? 1...K:a3 2.Rb3# but 1...K:a5! 1.Kb2?? (2.Bb3#) but 1...Nc1! 1.Ra1! zz 1...K:a3 2.R:a2# 1...Nb4+ 2.B:b4#
