1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4 Carlsen had the psychological advantage after  winning the previous must-win game. He also opted for the Italian, just  like So did earlier in the match. 3... g8f6  4. d2d3  4... f8c5  5. e1g1  5... h7h6  6. c2c3  6... e8g8  7. b2b4  7... c5b6  8. a2a4  8... a7a6  9. b1d2  9... d7d6  10. f1e1  10... c6e7  11. d3d4 White is taking over the initiative, and So goes for a typical exchange operation. 11... e5d4 This is a novelty as well. Alas, based on a miscalculation. 12. c3d4  12... d6d5 The point behind Black's play. This as usual leads to  equality. However here Carlsen has the strong 13. e4e5 It happens that  the knight on e7 is particularly badly placed. 13... f6h5 The most active way to keep the game going. 14. c4f1  14... h5f4 At least this knight is active. Nevertheless, the mistake  that Black committed costed him dearly. White's advantage in the center is overwhelming. 15. d2b3  15... e7g6  16. a4a5  16... b6a7  17. c1f4 Simple and good. 17... g6f4  18. d1d2  18... f4g6  19. b3c5  19... f7f6 There is a natural desire to undermine the huge center. 20. f1d3 That's the problem. The knight does not have a good retreat  square. Or defense. Therefore, So needs to abandon any hope for  competition in the center. 20... f6f5  21. d3c2  21... f8e8 