The bishop on g3 defends the e5-pawn but is a bit passive. White must look for an alternative here to fight for an advantage.
1. e2e4  1... c7c5  2. g1f3  2... d7d6  3. f1b5 A solid variation, which objectively is as good as opening the Sicilian with 3.d4 but which leads to more strategic positions. 3... b8d7 A popular option and the best to play for a win. 3...Bd7 is good but gives less chance of imbalance. 3...Nc6 is also playable but inferior to the other two moves. 4. e1g1  4... a7a6  5. b5d3  5... g7g6 This move doesn't immediately fight White's plan to advance the pawns in the center. 6. c2c3  6... f8g7  7. d3c2  7... g8f6  8. d2d4  8... e8g8  9. e4e5 [%c_effect e5;square;e5;type;Interesting;persistent;true] White can also delay the pawn's advance with several useful moves. 9... f6e8 It seems ugly to let the white center advance and return the knight, but Black also has his ideas. 10. f1e1  10... d6e5 This natural move is a novelty. 11. d4e5  11... e8c7 