Nepomniachtchi misses Nakamura's tactic here. Better is
1. b2b4  1... b7b5  2. a2a4  2... b5a4  3. a1a4  3... e7e6  4. d1c3  4... h8g6  5. h1g3  5... f7f5  6. e2e3  6... f8e7  7. b4b5  7... e8g8  8. b1a1  8... f5f4  9. g3e2  9... f4e3  10. d2e3  10... c7c6  11. e2d4  11... c6c5  12. d4f3  12... e7f6  13. a1a3  13... d7d5  14. f1e2  14... b8b7  15. e1g1  15... a8b8  16. e3e4  16... d5d4  17. c3d1  17... c8d7  18. c2c4  18... d4c3 Nakamura has won the opening battle and pushed White's forces backward. Can Nepomniachtchi hold on $2 19. d1c3 Nakamura's advantage grows with each passing move as he gains more and more initiative. 19... a7a6  20. e4e5  20... a6b5 Black ignores White's threat and finds a way to win the e5-pawn for free. 21. e2b5  21... d7b5  22. c3b5  22... g6e5  23. b5c3  23... e5f3  24. g2f3 Nepomniachtchi found himself in a dire situation here. He can cling to a small amount of hope given that Black's pawn structure isn't perfect but against a rampant Nakamura, the prospect of a draw seems unlikely. 24... b7b4  25. a4a6  25... f6e5  26. c3e4  26... e5h2 A slight misstep by Nakamura. 27. g1g2  27... h2f4  28. a3d3  28... b8e5 