Correct answer: Ra7+1.Qd5?? (2.Q:b5#) 1...Bc6 2.Nb4# but 1...Ba4! 1.R:a2+?? 1...Ba4 2.R:a4# but 1...b:a2! 1.Ra7+! 1...K:a7 2.Qb7# 1...K<