comment: Arjun has original ideas in almost all the openings.
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 