Correct answer: Rb61...b4 2.Qc4# 1...Ng3/Ng7/Nf4/Nf6 2.Nf6# 1...a3 2.Qb3# 1...Q:d7/Qc5 2.Qc5# 1...Q:e5 2.Qc5#/Q:c6# 1...Qe7/Qf8/Q