1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... f8c5  5. e1g1  5... g8e7  6. c2c3  6... e7g6 6...Ba7 is the modern continuation according to my Megabase. 7. d2d4  7... c5a7  8. c1e3 A natural move that Nakamura has not faced yet. 8... e8g8  9. b1d2  9... d7d6  10. f1e1  10... g8h8  11. h2h3 All of this is very natural as well as Black's next move. 11... f7f6 Black needs to be cautious. 12. a4c2  12... c6e7 Once again, Black managed to find a novelty $1 13. d2f1 Niemann's play is natural and does not require much effort. He is simply shifting his pieces toward the kingside. 13... c7c6  14. f1g3 Consistent. 14... c8e6  15. d1d2  15... d8c7  16. h3h4 Now it is also good. The Ng6 acts as the color red to the bull. 16... f8d8  17. h4h5  17... g6f8  18. f3h4 Nagging more kingside pressure without determining the pawn structure yet. 18... d6d5 Nakamura in return strikes back in the center. 19. h5h6  19... g7g5 Too optimistic $1 And most likely based on an oversight. 20. e3g5 Gutsy play by the younger American $1 20... f6g5  21. d2g5 For the piece White won a couple of pawns and decisively opened the floodgates towards his opponent's king. 21... e7g6 The only move. 22. g5f6 This is still OK. 22... h8g8  23. h4g6 Now Nakamura almost escapes $1 23... h7g6  24. e4d5 