1. e2e4  1... c7c5  2. g1f3  2... g7g6 As far as I know, this is the first time Caruana has played this variation, which can be called Hyper-Accelerated Dragon. Some new ideas have been found in this line, which has recently been revived and used by strong chess players. One of its experts is GM Abdusattorov, although he plays it in rapid games. 3. d2d4 The two big alternatives are 3.c3 and 3.c4. (This last move can lead to a transposition later.) 3... c5d4  4. f3d4  4... f8g7  5. b1c3 An \"old school\" move, not minding playing the Accelerated Dragon, which notoriously offers better chances for Black than the Dragon in its classic version. It's the most aggressive move, but I don't think it's the most accurate. 5... b8c6  6. c1e3  6... g8f6  7. f1c4  7... e8g8 In this version of the Dragon, White's attack is not as dangerous as in the traditional one. The main plan with f3-Qd2 is not as easy to implement, and this makes a difference. 8. c4b3  8... d7d6 A move that could end up transposing to the more traditional lines of the Dragon, but with White's possibilities somewhat limited. 9. f2f3  9... d8a5 The fourth most popular move. 10. d1d3 A practically new idea, played by just one GM before. 10... c6e5 A new move. 11. d3d2  11... c8d7  12. e1c1  12... f8c8  13. c1b1  13... e5c4  14. b3c4  14... c8c4 The last few moves are very natural. The game reaches an important moment. 15. g2g4 Following the natural plan of advancing the kingside pawns. 15... d7e6  16. d4b3 This is not as dangerous as in the previous move. 16... a5a6 