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 