This is one important position for the line with a7-a5 in the Italian.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... f8c5  4. d2d3  4... g8f6  5. e1g1  5... d7d6  6. c2c3  6... a7a5  7. f1e1  7... e8g8  8. h2h3  8... h7h6  9. b1d2  9... c8e6  10. c4b5  10... d8b8  11. d2f1 