Carlsen is strictly following his plan, but this move is surprisingly a novelty.
1. e2e4  1... c7c5  2. g1f3  2... b8c6  3. f1b5  3... g7g6  4. e1g1  4... f8g7  5. c2c3 This is what we call the Classical Rossolimo. In the beginning, it was all about White expanding in the center. 5... g8f6  6. f1e1  6... e8g8  7. d2d4  7... d7d5 Black naturally would not give the most vital part of the board without a fight. 8. e4e5  8... f6e4  9. c1e3  9... c5d4  10. c3d4  10... d8b6  11. d1e2  11... c8d7  12. b5a4  12... a8c8  13. b1c3  13... e4c3  14. b2c3  14... b6d8 A brilliant move that defends the bishop, thus preparing the knight maneuver via a5 towards the c4-square, while creating the tactical threats of Nc6xd4! and/or Nc6xe5! 15. a4b3 