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. 9... d8c7  10. c4a2  10... b7b6  11. e1g1  11... c8a6 An excellent diagonal for the bishop.