context: 1. g1f3  1... g8f6  2. g2g3  2... g7g6  3. b2b3 Carlsen decides not to enter into a theoretical battle in the opening and chooses the calm double fianchetto variation. 3... f8g7  4. c1b2  4... d7d6  5. f1g2  5... e7e5  6. d2d3  6... e8g8  7. c2c4 White's system is harmless for an elite classical game, but in rapid a normal position is enough to fight for a win. 7... a7a5 