[FEN "8/8/7k/3N4/1r6/8/2q5/K5N1 w - - 0 1"]1.Ne3 Qf2 2.Nc2 Re4 3.Kb2 Kg5 4.Kc3 Kf4 5.Nb4 Ke3 6.Nd5# .
[FEN "8/8/7k/3N4/1r6/8/2q5/K5N1 w - - 0 1"]1.Nxb4 Kg5 2.Nf3+ Kf4 3.Nd4 Ke3 4.Nxc2+ Kd2 5.Ne3 Kc1 6.Nb3# .