A new move.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. d2d3  5... f8c5  6. c1g5  6... h7h6  7. g5h4  7... d7d6  8. d3d4 A move that Carlsen employed against Keymer in the recent World Cup in a game where he was in a must-win situation. 8... e5d4  9. f3d4  9... c8d7  10. a4c6 