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 