1. c2c4  1... e7e5  2. b1c3  2... g8f6  3. e2e3  3... d7d5  4. c4d5  4... f6d5  5. g1f3  5... b8c6  6. d1c2 It is curious that a year ago in a similar must-win situation, Carlsen chose the same opening against Nakamura to try and level the score. For several moves, the two players followed that game. 6... d5b4  7. c2b1  7... f7f5  8. a2a3  8... b4d5  9. d2d3  9... c8e6  10. f1e2  10... f8e7  11. e1g1  11... e8g8  12. c3d5  12... e6d5  13. b2b4 