1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. b1c3  3... h7h6 A cunning line, played regularly by Carlsen among other top players. 4. g1f3  4... g8f6  5. e2e3 Sevian decided to keep his dark-squared bishop behind the pawn chain. 5... f8d6 Here too, the bishop can be developed more powerfully. 6. b2b3  6... e8g8 