As is common in these Italian opening positions, Black must decide whether to play a7-a6 or a7-a5. Both options are very popular.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... g8f6  4. d2d3  4... f8c5  5. c2c3  5... d7d6  6. e1g1  6... e8g8  7. f1e1 