1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. c4d5 The first important moment. Nepomniachtchi has been confidently playing the line with 4. Nc3 c5, which sometimes leads to long forced draws. This system was played by So in this round. Instead of getting into a theoretical battle, Carlsen tries to take the game into his own turf. 4... e6d5  5. b1c3  5... c7c6 The problem for White in this line is that there is no way to prevent the black bishop from developing to f5. Usually in the Queen's Gambit exchange variation it's possible to avoid this by placing a bishop on d3 or the queen on c2. In this game's move order, Black can force the development of the bishop, even if he has to play g6 first. 6. c1f4 The third most popular move, simply ignoring 6...Bf5. 6... c8f5  7. e2e3  7... b8d7  8. h2h3 With this move White plans to play g2-g4 and create some annoyance for the f5-bishop. 8... f8e7  9. g2g4  9... f5e4 Curiously this move was tried before by Carlsen himself in a blitz game against Anand. 10. f1e2 The first new move. 10... d8b6  11. d1b3  11... b6b3  12. a2b3 White doesn't have any particular advantage, but Carlsen thrives in this type of position. 12... e4g6  13. f3h4 Going after the bishop. From now on, Nepomniachtchi starts to play small inaccuracies. 13... e7b4 White gets a small plus after this move. 13...Ne4 or 13...Bc2 are more dynamic moves. 14. h4g6 