Correct answer: Nb51...Bb1/Bc4/Nb3 2.Bc4# 1.Bf1?? (2.Bg2#) 1...Bb1 2.Bc4# but 1...h3! 1.Bb7?? (2.B:c6#) but 1...Rh6! 1.Nc2?? (2.Nb4#)
