Carlsen delays the development of his kingside.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... d5c4  5. e2e4  5... b7b5 A very fresh line which was tried on a couple of occasions by Caruana. Apparently Nakamura liked  the idea and decided to give it a try. 6. e4e5  6... f6d5  7. c3b5  7... d5b6  8. a2a3  8... b8c6  9. c1e3  9... c6a5 Played after some hesitation. The knight is  protecting the c4-pawn and is ready to jump on b3 at the right moment. 10. d1c2 The opening is over and Nakamura has a few weaknesses to worry  about. But the c4-pawn is also a strength that cramps the white bishop and secures an excellent outpost for the knight. 10... a7a6 Not only chases  the knight back home, but deprives the queen of the c3-square. 11. b5c3  11... f8e7 