Correct answer: Rb71...Kf8 2.Rh8# 1.Rc7?? (2.Rh8#) but 1...Kd8! 1.Ra7?? (2.Rh8#/R:a8#) 1...O-O-O 2.Ra8# 1...Rb8/Rc8/Rd8 2.Rh8# but 1...
