The novelty worked perfectly for  White. He enters the endgame as a clear favorite.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... g8f6  4. f3g5 The last time Van Foreest played  this line was in 2015. 4... d7d5  5. e4d5  5... c6a5  6. c4b5  6... c7c6  7. d5c6  7... b7c6  8. b5d3  8... f6d5  9. g5f3  9... f8d6  10. b1c3  10... e8g8  11. d3e2  11... d5f4  12. e1g1 White's play seems very slow, but as long as his king is in safety he can afford playing like this. 12... c8g4  13. d2d3  13... f4e2 The bishop was an important defender. 14. d1e2  14... f7f5 Now the pin along the h5-d1 diagonal looks scary and Carlsen wants to open all the  files with e5-e4. 15. h2h3  15... g4h5  16. g2g4 A strong novelty!  Apparently, Van Foreest did a very thorough preparation for the  tournament. 16... f5g4  17. f3g5 The point behind Van Foreest's operation. A strong blockading  knight will a secure stable kingside for White and will keep the black  bishops away from his king. 17... d8d7  18. c3e4 Another strong maneuver. The knight is heading to g3. 18... d6e7  19. e4g3  19... h5g6  20. e2g4  20... d7g4 