[%c_effect g3;square;g3;type;Inaccuracy;persistent;true] This allows the knight to go to f4.
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 