Correct answer: Bb11...b2 2.Rd1# 1...Rb5/Rb6/Rb7/Rb8/Ra4/R:c4 2.O-O# 1.B:b4?? (2.O-O#) but 1...c:b4! 1.Be2?? zz 1...Kb1/Rb5/Rb6/Rb7/R
