1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. d2d4  3... e5d4  4. f3d4  4... g8f6  5. d4c6  5... b7c6  6. e4e5  6... d8e7  7. d1e2  7... f6d5  8. b1d2 This isn't the most popular move, but it was played a few days ago by Erigaisi in a rapid online game, which certainly hasn't escaped Carlsen's team's attention. 8... d5f4  9. e2e3  9... f4d5 