Correct answer: Neg21...Nb8/Nc5/Nc7 2.R:b4# 1...Q:a4/Qc4/Qd4 2.Qd3# 1.Nf5?? (2.Ng3#/Nd6#) 1...Qc4 2.Qd3# but 1...K:f5! 1.Kb2??
