1. e2e4  1... b8c6  2. d2d4 The principled choice. 2... d7d5  3. e4e5  3... c8f5 A well-known pawn structure. Black's knight is badly placed on c6, but it's not such a big deal. 4. g1f3  4... e7e6  5. f1d3  5... f5d3  6. d1d3  6... d8d7  7. c2c3  7... f7f6 [%c_effect f6;square;f6;type;GreatFind;persistent;true] Breaking the center and giving life to the pieces. 8. e1g1  8... f6e5  9. d4e5  9... a7a5 A new move but not the best one. 10. f1e1  10... f8c5  11. b1d2  11... a5a4 [%c_effect a4;square;a4;type;Mistake;persistent;true] This is too slow. 12. b2b4  12... a4b3  13. d2b3  13... c5b6  14. c1e3  14... b6e3  15. e1e3  15... b7b6 [%c_effect b6;square;b6;type;GreatFind;persistent;true] Preventing Nc5. 16. f3g5  16... g8e7 [%c_effect e7;square;e7;type;GreatFind;persistent;true] Black has to sacrifice the pawn. 17. g5h7  17... e7f5  18. e3h3  18... e8d8 [%c_effect d8;square;d8;type;Mistake;persistent;true] 19. a2a4 [%c_effect a4;square;a4;type;Mistake;persistent;true] There's no need to give the pawn back. 19... c6e5  20. d3e2  20... e5g6 