A prophylactic move against g4, but preparing the break on b4 or d4 gave more chances of an advantage.
1. e2e4  1... c7c5  2. g1f3  2... b8c6  3. f1b5  3... e7e6 This and 3...g6 are the main moves. 4. b5c6  4... b7c6  5. d2d3  5... d8c7 [%c_effect c7;square;c7;type;Interesting;persistent;true] The third most popular move. The idea is to improve the pawn structure with e6-e5 at some point, maybe even on the next move. 6. b1c3  6... e6e5 [%c_effect e5;square;e5;type;GreatFind;persistent;true] 7. e1g1  7... g8e7  8. f3h4  8... e7g6  9. d1h5  9... d7d6 [%c_effect d6;square;d6;type;GreatFind;persistent;true] A new move. 10. c3e2  10... f8e7  11. h4f5  11... e7f6  12. e2g3 [%c_effect g3;square;g3;type;Inaccuracy;persistent;true] This allows the knight to go to f4. 12... g6f4 [%c_effect f4;square;f4;type;GreatFind;persistent;true] 13. h5f3  13... g7g6 White's knight is forced back and Black has a fine position. 14. f5e3  14... h7h5  15. g3e2  15... f6g5  16. h2h3  16... f4e6  17. e3c4  17... g5c1 [%c_effect c1;square;c1;type;Inaccuracy;persistent;true] 18. a1c1  18... c7e7  19. f3e3  19... g6g5 