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 