Correct answer: Bc51...Qb1/Qb3/Qb4/Qb5/Qb7 2.Nf6#/Ne5# 1...Qb6 2.Nf6#/N:b6#/Ne5# 1...Qb8 2.Nf6#/N:b8# 1...Qa2/Qc2/Q:d2/Q