Correct answer: Rb71...Rb7 2.Qh1# 1...Rb1/Rc8/Re8/Rf8/Rg8/Rh8/Bb7 2.Q:b1# 1.Rg7?? (2.Rg1#) 1...Rf8/Rg8 2.Qb1# but 1...Kf1!
