Carlsen wants to keep his second bishop on the  board.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... g8f6 The Berlin versus So! Why not? 4. d2d3  4... f8c5  5. b5c6  5... d7c6  6. e1g1  6... d8e7  7. b1d2  7... c8g4  8. h2h3  8... g4h5  9. d2c4  9... f6d7  10. a2a3 The world champion is  closely watching the efforts of his competitors and comes up with an  improvement upon a very fresh game. 10... a7a6 A novelty. Carlsen  secures the a7-g1 diagonal for his bishop. 11. b2b4  11... c5a7  12. c1e3 The black bishop is too strong to be left alive. On  top of that, White is depriving the opponent of his bishop pair. 12... a7e3  13. c4e3 The knight moves towards the optimal square. 13... f7f6  14. e3f5 