Time for another brilliancy:
1. g1f3  1... c7c5  2. c2c4  2... b8c6  3. d2d4 An English move order to prevent  Nepomniachtchi's Grunfeld. 3... c5d4  4. f3d4  4... g8f6  5. b1c3  5... e7e6  6. a2a3  6... f8e7  7. e2e4  7... e8g8  8. d4f3  8... d8a5 Nepomniachtchi had used this maneuver before as well,  but he is in for a surprise. 9. c1d2  9... a5h5  10. h1g1 A nice novelty.  g2-g4 is on the agenda and cannot be prevented. 10... a7a6  11. h2h3  11... c6e5  12. g2g4 Giri expands and chases away the enemy knight from the center,  thus limitting Nepomniachtchi's chances for a central counter-strike. 12... e5f3  13. d1f3  13... h5c5  14. g4g5  14... f6e8 In line with his plan. 15. h3h4  15... b7b5 This is the other way to attack the center, which is ruined in a Benko gambit style. 16. c4b5  16... a6b5  17. f1b5  17... c8b7  18. b5d3  18... e8d6  19. f3e2 Too slow. 19... f8c8  20. a1c1  20... c5b6  21. d2e3  21... b6a5 Threatening the e4-pawn. 22. e3d2  22... a5b6  23. d2e3  23... b6a5  24. e3d2 Giri repeats moves. 24... b7a6 While Nepomniachtchi feels  that his initiative is worth more than the pawn. 25. d3a6  25... a8a6  26. e1f1  This move would be played sooner or later. 26... a6c6  27. d2e1  27... a5c7 Now the white king will be permamently weak. For starters  Nepomniachtchi prepares the opening of the center. 28. g1g3  28... d6c4  29. c1c2  Stepping out of the next attack. 29... c7f4  30. g3h3  30... e7f8  31. c3d1 The moment is gone and this only helps Black now! 31... d7d5 This is it, the center is unblocked! 32. e4d5  32... e6d5  33. e2f3  33... f4d6  34. c2e2  34... d5d4 Black is coupling the threats against the white  king with the advance of the d-passer. 35. e1b4  35... d6d7  36. b4f8  36... c8f8  37. f1g2  37... f7f6 Logical and strong. Black opens up  lines the king. 38. f3e4  38... f6f5 This might have come as a surprise for White. The point was demonstrated after: 39. e4f3  39... f5f4 Where is this pawn heading to? 40. b2b4 Now the point of  Nepomniachtchi's f-power play: 40... c4e3 Sweet! The f-file is opened, the central passers are  running. Everything is just as Black wanted it. 41. f2e3  41... f4e3  42. f3e4  42... c6e6  43. e4d3  43... d7c6  44. g2g1  44... e6e4 Mate is approaching and Giri finds his only chance. 45. d1e3  45... d4e3  46. e2e3 But this is making Black's win easier. 46... c6c1 