1. c2c4  1... e7e5  2. b1c3  2... g8f6  3. g1f3  3... b8c6  4. e2e4  4... f8c5 Black challenges his opponent on his own territory $1 5. f3e5  5... c6e5  6. d2d4  6... c5b4  7. d4e5  7... f6e4  8. d1f3  8... d7d5 [%c_effect d5;square;d5;type;Interesting;persistent;true] A fresh but risky line, according to the Azeri GM. 9. f1e2 The most reliable answer. White needs to complete his development ASAP. 9... d5d4 [%mdl 4][%c_effect d4;square;d4;type;Interesting;persistent;true] A promising side line. 10. f3e4  10... d4c3  11. e1g1  11... e8g8  12. a2a3  12... c3b2  13. c1b2  13... b4c5 This has been seen just once, and Caruana's next logical move turns out to be a novelty. 14. e2d3 There are no kingside defenders; therefore, this move is self-explanatory. 14... g7g6 A needed weakening, and White wants to capitalize on it at once. 15. e5e6 [%c_effect e6;square;e6;type;GreatFind;persistent;true] 15... d8e7 [%c_effect e7;square;e7;type;GreatFind;persistent;true] More or less the only move.