1.Nc3 e6 2.d4 Bb4

White can play:

3.Nf3 f6 4.d5 (or 4.e4 d5 5.Bb5+; 5.e5) 4...Nh6 (or 4...Nc6 5.e4 Nd4 6.Ne5 d6 7.Qh5+ g6 8.Nf7) 5.Bxh6 O-O 6.e3 Nc6 (or 6...g6),

3.e4 Nh6 (or 3...d5).