1.Nc3 Nf6 2.e4 c6

White have several possibilities:

3.Nd5 cxd5 4.Bb5 (or 4.Nh3) Nc6 5.f3 (or 5.Nh3 Ng4 6.f4 f6 7.Ng5) e6 (or 5... g6) 6.Nh3 h6 (or 6...g5),

3.h3 b5 4.d4 e5,

3.f3,

3.Nh3 Ng4 4.f4 d5 (or 4...f6).