Correct answer: Rb41...Bb4/Bc7 2.Q:b4# 1...Bb1 2.Rc4#/Nb3# 1...Bb3+ 2.N:b3# 1...Bc4 2.d4#/R:c4# 1...N:d3 2.N:d3# 1.Rb4! (2.d4#) 1...