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.