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  10... d7c6 A new move. 11. d4c6  11... b7c6  12. b1d2  12... e8g8  13. d1f3  13... f8e8 Black is not so worried with the capture on f6, since his activity compensates for the damaged pawn structure in the endgame. 14. h4f6  14... d8f6  15. f3f6  15... g7f6  16. e1g1  16... f6f5 [%c_effect f5;square;f5;type;GreatFind;persistent;true] Black takes advantage of this resource to improve the pawn structure. White should not capture the pawn, since 17. f1e1  17... a8b8  18. a1b1 This ugly move is necessary in order to keep fighting for the win. Black has no problems after 18... f5e4 