1. c2c4  1... g8f6  2. g1f3  2... d7d6 Already a surprise. Caruana plays the KID very, very  rarely. 3. d2d4  3... g7g6  4. b1c3  4... f8g7  5. e2e4  5... e8g8  6. f1e2  6... e7e5  7. e1g1  7... c8g4 This is what the American wanted to try, a relatively fresh  line. 8. c1e3  8... g4f3 The main point behind Black's idea. He wins a few tempi  chasing the enemy bishops back. 9. e2f3  9... e5d4  10. e3d4  10... b8c6  11. d4e3  11... f8e8  12. d1d2  12... f6d7  13. a1d1  13... g7c3 An important novelty which softens the  e4-pawn, just as in the line from above. 14. d2c3  14... d8f6  15. c3c1  15... d7c5  16. c1b1 The queen ended defending the pawn anyway. 16... f6e6 Aggressive play by Caruana. 17. f1e1  17... e6c4 Black has won a pawn, but the bishop pair cannot be  underestimated. 18. b2b3  18... c4c3 The queen is best located on the long  diagonal. 19. e3d2 