context: 1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... d7d5  4. c4d5  4... e6d5 Carlsen is one of the leading specialists in the QGD. 5. c1g5  5... c7c6  6. e2e3  6... c8f5  7. g1e2 Arjun has original ideas in almost all the openings. 7... f8d6 So does Carlsen. This is considered to be a promising side line. 8. e2g3  8... f5g6  9. d1f3 This is a novelty, but a common idea as we have already seen. 9... b8d7  10. g3f5  10... g6f5 This bishop is a problematic piece anyway, better leave the board. 11. f3f5  11... h7h6 A standard procedure. 12. g5h4  12... g7g6  13. f5c2  13... d8e7 The optimal square for the queen which prepares the long castling.