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  14... e7f8 Carlsen wants to keep his second bishop on the  board. 15. f5g3  15... h5f7 Carlsen hopes to use the knights as tempo-gainers when  advancing his kingside passer. However, So is the one to open the game  after 16. d1d2  16... g7g6  17. f3h2  17... h7h5  18. f2f4 