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  12. c1f4 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. 12... c7e6  13. f4g3  13... b7b5 [%c_effect b5;square;b5;type;GreatFind;persistent;true] Black has an easy plan with Bb7 and c4 and then putting a knight on c5. The position is equal. 14. b1d2  14... c5c4  15. d1e2  15... c8b7  16. d2e4  16... h7h6 [%c_effect h6;square;h6;type;Mistake;persistent;true] This move creates weaknesses on the kingside, and now White has the advantage. Caruana probably wanted to prevent a knight move to g5, but this is not so dangerous. 17. h2h4  17... d8b6  18. a2a4 [%c_effect a4;square;a4;type;Inaccuracy;persistent;true] This move is not very useful for White's position. It's possible to begin an attack immediately with 18... a8d8  19. a4b5  19... a6b5 