Not allowing any unpinning checks.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. e1g1  5... f8c5  6. c2c3  6... b7b5  7. a4c2  7... d7d5 A  very sharp line. 8. d2d4  8... d5e4  9. d4e5 Nakamura gets rid of the queens at  once. 9... d8d1  10. f1d1  10... e4f3  11. e5f6  11... g7f6  12. c2e4  12... c8d7  13. b1d2 Only a  handful of games were played in this line, but both players are making  their moves confidently and fast. 13... f3g2 Caruana is the first one  to spend time on the clock. 14. d2b3  14... c5b6  15. b3d4  15... b6d4  16. c3d4 [#] 16... e8c8 All of this  has been seen before except for the last move by Black. 17. c1f4  17... h8e8  18. e4g2 The first think by Nakamura as well. Aparently he  was contemplating the pros and cons of the capture on g2. 18... c6e7 If Nakamura manages to consolidate, he would find a way to  make the best out of his wonderful bishop pair. Especially with the c-file opened for his rooks. 19. a1c1  19... c7c6  20. d4d5  20... c8b7  21. c1c5 Best move, played once again quickly by  Nakamura. 21... c6d5  22. g2d5  22... d7c6  23. d5c6  23... e7c6  24. d1d8  24... c6d8  25. c5c7  25... b7b6  26. c7d7  26... b5b4 And this turns out to be a poor choice. The pawns cannot survive on their own, as the black king also has other obligations. 