Correct answer: Qb71...Rb4/Rb3/Rb6/Rb7/Rb8/Ra5 2.Bf1# 1.Ke7?? (2.Qh8#) 1...Rb4/Rb8 2.Bf1# but 1...Rb7+! 1.Kf7?? (2.Qh8#) 1.
