1. c2c4  1... g8f6  2. b1c3  2... e7e5  3. g1f3  3... b8c6  4. g2g3  4... c6d4 A relatively rare line, which Caruana also used some time ago. It seems as it is coming back into fashion these days at the top level. 5. f1g2  5... d4f3  6. g2f3  6... f8c5 The second main move. 7. d2d3 The main move is 7.0-0. 7... e8g8  8. e1g1  8... a7a5 Obstructing the opponent's queenside expansion well in advance with a novelty. 9. f3g2  9... c7c6  10. c1d2 Both sides accomplish their development and try to build play where they are stronger. Caruana intends queenside expansion, whereas Aronian is looking for a way to equalize in full with the help of the d7-d5 break. 10... d7d6  11. a2a3  11... c8e6  12. d1c2  12... h7h6 Last preparation. 13. c3a4  13... c5a7  14. c4c5 White strikes first. 14... d6c5 After some thought, Aronian decided to concede the bishop pair. 15. a4c5  15... a7c5  16. c2c5  16... e6d5 The point. Without the bishop pair, it should be equal. 17. f2f3 Therefore Caruana keeps both his bishops alive in a slightly awkward-looking way. 17... a5a4 Fixing some pitstops for both his pieces.