1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. d1c2  4... e8g8  5. a2a3  5... b4c3  6. c2c3  6... d7d5  7. c1g5  7... h7h6 7...dxc3 and 7...c5 are popular alternatives. 8. g5f6  8... d8f6  9. g1f3  9... d5c4  10. c3c4  10... b8c6  11. c4c3 This move is necessary to fight the e6-e5 advance. All this is still theory. 11... f8e8  12. a1d1  12... e6e5  13. d4d5  13... c6b8  14. e2e3  14... c8f5 The computer's favorite move. Caruana, as always, shows impeccable preparation.