1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... f8c5  4. d2d3  4... g8f6  5. a2a4  5... e8g8  6. a4a5  6... a7a6  7. e1g1  7... h7h6  8. c2c3  8... d7d6  9. h2h3  9... c5a7  10. c1e3  10... c6e7 As a rule,  Black prefers not to trade on e3 as this will open a valuable file for the first player. 11. e3a7  11... a8a7  12. f1e1  12... e7g6  13. b1d2  13... f8e8 