Now Black wins a pawn and is in the driver's seat.
1. g1f3  1... d7d5  2. g2g3  2... g8f6  3. f1g2  3... e7e6  4. e1g1  4... f8e7  5. d2d3 Nepomniachtchi chose the  King's Indian Attack for the decisive game. 5... e8g8  6. b1d2  6... c7c5  7. e2e4  7... b8c6 This can be considered Black's main line. 8. f1e1  8... b7b5  9. e4e5  9... f6d7  10. d2f1  10... a7a5  11. h2h4 Those of you who followed my mini-course on Chess.com about the KIA are familiar with the ideas for both sides. White is quickly  building a strong attacking setup on the kingside while maneuvering his  queenside knight to g4, whereas Black tries to counter on the opposite  wing and the center. 11... b5b4  12. c1f4  12... a5a4  13. a2a3 An important move for  White, who needs to slow his opponent down on the queenside. 13... b4a3  14. b2a3  14... a8b8  15. f1e3 The knight can reach the g4-square from here too. 15... c8b7 An obvious developing move and a novelty. 16. c2c4 Nepomniachtchi fires back at the center while opening the road for his queen. 16... d7b6  17. c4d5  17... b6d5 However, So keeps playing  confidently and is not afraid to sacrifice a pawn. 18. d1a4  18... d5c3 Playing for activity. 19. a4c4  19... d8a5  20. a1c1  20... c3b5 Black achieved what he wanted. His pieces are  active, and White cannot establish good communication between his forces. 21. e3c2  21... b5a3 Time to regain the material. 22. c2a3  22... a5a3  23. f4g5 A typical move for the opening. Nepomniachtchi  swaps the most important defender. 23... f8d8 However, Black is quick enough to underline the weakness of  the white d3-pawn too. Everything perishes after 24. g5e7  24... c6e7  25. c4c5  25... a3c5  26. c1c5  26... b7f3  27. g2f3  27... d8d3  28. f3e4  28... d3d7 This, of course, should be a draw, but Nepomniachtchi decided to press for a while. 29. h4h5  29... g7g6 An  accurate move that frees Black from all back-rank mating threats. 30. g1g2 Still pushing. 30... g8g7  31. e1h1  31... e7g8 Black has everything under control. 32. h1c1  32... g6h5 It is So's turn to try little something. 33. c1h1  33... b8b4  34. e4c2  34... g7h6  35. c2d1  35... h5h4 The point behind So's play. Black needs to break the  opponent's chain too. 36. d1e2 And this obvious move is a serious  inaccuracy. 36... g8e7  37. h1h4  37... b4h4  38. g3h4  38... e7g6  39. g2g3 