1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. d2d3 Carlsen has plenty of experience with this flexible move that avoids the Open Variation (where Black takes the e4-pawn). 5... f8c5 The problem with 5.d3 is that Black can develop the bishop to this active square. 6. c2c3  6... b7b5  7. a4b3  7... d7d6  8. c1g5 This pin usually sharpens the game as Black is invited to play h6-g5. 8... h7h6  9. g5h4  9... c5b6 A useful prophylactic move, anticipating White's d-pawn advance. 10. b1d2  10... g7g5  11. h4g3  11... d8e7  12. a2a4  12... a8b8  13. a4b5  13... a6b5  14. d2f1 [%c_effect f1;square;f1;type;GreatFind;persistent;true] One advantage of not being castled yet is that the knight can be maneuvered immediately to the e3-square. 14... c8e6  15. f1e3  15... b6e3 A good and practical decision, getting rid of the problems that this knight can generate. That said, it's possible to delay this capture as well. 16. f2e3  16... e8g8  17. e1g1  17... b8a8 [%c_effect a8;square;a8;type;Inaccuracy;persistent;true]