A tricky move order that deprives Black of the standard Nc6-a5 maneuver.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. e1g1  5... f8e7  6. f1e1  6... b7b5  7. a4b3  7... e8g8  8. a2a4  8... c8b7  9. d2d3  9... d7d6 