Locks the king in!
1. g1f3  1... d7d5  2. g2g3  2... g7g6  3. f1g2  3... f8g7  4. d2d4  4... g8f6  5. e1g1  5... e8g8  6. c2c4  6... c7c6  7. b2b3 Carlsen used a version of this solid line to defeat Nepomniachtchi in their final test before their world championship match. 7... c8f5 The main line. 8. c1b2  8... b8d7  9. e2e3 This is the new trend, according to Megabase, that outshines the older 9.Nbd2. 9... f6e4 The most typical maneuver for the line. Black opens up his dark-squared bishop and prepares to swap a pair of light pieces. 10. b1c3  10... e4c3  11. b2c3  11... f5e4 This is possible thanks to the previous maneuver. 12. d1e2  12... e7e6  13. f1d1 In the meanwhile, the world champion clears the f1-square to avoid the trade of the light-squared bishops. Without them, there is no hope of an edge. 13... a7a5 Black uses the given time to prepare counterplay on his own. 14. g2f1  14... e4f3  15. e2f3  15... d7c5 This maneuver is also possible thanks to the ...Nf6-e4-xc3 one. So many possibilities, just because a pair of light pieces have been traded! 16. c3e1  16... c5e4  17. f1d3 This is a novelty. 17... f7f5 Van Foreest is shifting into a Stonewall where Black has kept a valuable pair of light pieces alive. 18. a1c1 Still, Carlsen has a serious plan in stock: the preparation of the e3-e4 break. Black's next maneuver is designed to stop this for good. 18... g6g5  19. f3e2 And after some thought, Van Foresst went for 19... g5g4 Thus sacrificing a pawn! 20. d3e4  20... f5e4 The point. 21. e2g4 I browsed through the games at that point and a quick glance at the position, count of the pawns, and a peek at the computer bar made me think that Van Foreest had badly messed up. 21... d8e8 None of the above is true! Black has solid compensation thanks to the half-open files on the kingside, and the holes on the light-squares only facilitate his play. 22. c4d5 In order to open a file for his rooks. 22... e6d5  23. c1c5 The logical follow-up. 23... h7h5  24. g4h3  24... e8f7 Van Foreest keeps the queenside stable. 25. h3g2 Now the a5-pawn is in danger. 25... a5a4  26. b3b4  26... f7d7  27. b4b5  27... h5h4 Black is consistent with his plan. 28. d1c1  28... f8f6  29. b5c6  29... b7c6  30. g3g4 A tough decision! Carlsen tries to seal the kingside, but his opponent is alert. 30... h4h3 A second pawn is offered for even more files. 31. g2h3  31... a8f8  32. h3g2  32... f6g6 The most obvious attempt gives Carlsen some addiitonal chances. 33. g4g5 Best! The pawns are further separated, but this bold move slows down Black's initiative. 33... f8f5 Once again, the most obvious move. 34. h2h4  34... g7f8  35. c5c2  35... f8e7 With the inevitable capture on g5, one way or the other! 36. c2b2 Not just activating the rook, but avoiding the additional chances that the black queen might take. Also inviting Black to a self-pin. 36... e7g5 Van Foreest errs! 37. g1f1  37... d7a7  38. g2g4 Alas, Carlsen transposes the moves, and misses the win!