Correct answer: Rb51...Bb7/Qf6 2.Nd6# 1...Qg6/Qg4/Qg2/Qg1/Qg8/Qh6 2.Nd6#/Qe5# 1...Qg5/Q:h8/Qc3/Qb2/Qa1 2.Nf:g5#/Nd6# 1
