1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. g2g3 The choice of the Catalan Opening shows how seriously Carlsen was taking this match. That was his main opening in the world championship duel against Nepomniachtchi. 4... f8e7  5. f1g2  5... e8g8  6. e1g1  6... d5c4 