1.e4 d5 2.e5

Black can play 2...Bf5 with possible continuations 3.Bd3 g6 or 3.d3 e6 (if 4.Bg5 then 4...f6 and 5.Bxf6 Qh4 6.g3 Qd4 and black wins).

Other moves are:

2...Nc6,

2...e6 3.Nf3 f6,

2...Bg4 3.f3 g6 (or 3...e6; 3...Bf5).