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 