1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. e2e3  4... e8g8  5. f1d3  5... d7d5  6. a2a3  6... b4c3  7. b2c3  7... d5c4  8. d3c4  8... c7c5  9. g1e2 The advantage of this move over the more natural development of the knight on f3 is that it can now go to g3, supporting the advance of the e-pawn.