Correct answer: Ra21...K:d3 2.O-O-O# 1...Bh4/B:f4/Bf6/Be7/Bd8 2.Rd5# 1...c:d3 2.Ra4# 1.R:g5?? (2.Rd5#) 1...K:d3 2.O-O-O# 1...c:d3 2.Ra4# but 1...