1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. f1b5  3... b8d7 This and 3...Bd7 are the most popular moves. My old favorite, 3... Nc6, is not enough for equality. 4. a2a4 White has many possible plans in this system. This is one of the popular choices right now. The pawn push is useful because the bishop will go back after a7-a6, and Black will not have the chance to play b7-b5. 4... g8f6  5. b1c3  5... a7a6  6. b5e2 