Carlsen decides to develop the knight to f6 and not g7, thus protecting himself against Ng4.
1. e2e4  1... c7c5  2. b1c3  2... b8c6  3. g1f3  3... e7e5  4. f1c4  4... g7g6  5. d2d3  5... h7h6  6. h2h3 A rare move, setting up the plan with Nh2-g4. 6... d7d6  7. f3h2 [%c_effect h2;square;h2;type;GreatFind;persistent;true] 7... f8g7  8. e1g1 