1. d2d4  1... g8f6  2. g1f3  2... d7d5  3. c1f4  3... c7c5  4. e2e3  4... b8c6  5. b1d2  5... c5d4  6. e3d4  6... d8b6  7. d2b3  7... c8g4  8. a2a4  8... a7a6 A novelty, which prevents the white a-pawn from  going too far. 9. a4a5  9... b6a7  10. c2c3  10... e7e6  11. f1e2  11... f6h5  12. f4e3 