Black's plan is to hold his pawn on d4 as long as he can.
1. e2e4  1... c7c5  2. g1f3  2... b8c6  3. f1b5  3... e7e6  4. e1g1  4... c6d4 Another rare line issued by Carlsen. 5. f3d4  5... c5d4  6. c2c3  6... a7a6  7. b5d3 