[%c_effect d1;square;d1;type;GreatFind;persistent;true] A very good prophylactic move, avoiding the advance of the c-pawn.
1. c2c4  1... g8f6  2. b1c3  2... e7e5  3. g1f3  3... b8c6  4. d2d4 Carlsen likes the English Opening and plays it often, but the text move is a new weapon in his arsenal, as I haven't found any games of his with this move. 4... e5d4  5. f3d4  5... f8b4  6. g2g3  6... e8g8  7. f1g2  7... f8e8  8. e1g1  8... h7h6 This is a new move. Black normally captures the knight as soon as it's unpinned. 9. c3d5  9... f6d5 Black has to capture the knight. 10. c4d5  10... c6d4  11. d1d4 This position is strategically dangerous for Black, who runs the risk of becoming passive, while White exploits the better pawn structure and the semi-open c-file. 11... d8e7 [%c_effect e7;square;e7;type;Inaccuracy;persistent;true] 12. c1e3  12... b4d6 