Correct answer: Na21...Qc6/Qa7/Qe7/Qe5/Qf4/Qg3/Qd8/Qb8 2.R:c6# 1...R:d3 2.N:d3# 1...Rf5/Rf4/Rff3/Rf2/Rf1/Rf8/Re7/R