Well prepared! The "Latvian" sacrifice was never  tried in this particular version.
1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... f8b4  5. c1g5  5... h7h6  6. g5d2 Carlsen deviates from a recent game of his. 6... e8g8 