1. e2e4  1... c7c5  2. g1f3  2... e7e6  3. d2d4  3... c5d4  4. f3d4  4... g8f6  5. f1d3 Much less common than 5.Nc3. Carlsen usually finds his own ways to play the openings, most of the time avoiding variations that are too theoretical. Everybody recognizes his brilliant play, especially in the endgame, but I think his legacy in opening theory is no less important and usually underrated. 5... d7d6 Certainly not the way to challenge, theoretically speaking, white's previous move. Abdusattorov makes a practical choice to accept a hedgehog pawn structure. 6. c2c4  6... f8e7  7. b1c3  7... a7a6  8. c1e3 