Correct answer: Qb51...Rd2+ 2.Bd4# 1...Nb3 2.Qe4# 1.Rb7?? (2.Rb2#) 1...Bd1 2.Be1# 1...Rd2+ 2.Bd4# but 1...Nb3! 1.Qa4+?? 1...Nb3 2.
