1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1c4  3... f8c5  4. c2c3  4... g8f6  5. d2d4 The good old classical  line that So already used to beat the world champion earlier this year. 5... e5d4  6. e4e5  6... d7d5  7. c4b5  7... f6e4  8. c3d4  8... c5b6  9. b1c3  9... e8g8  10. c1e3  10... c8g4 The  pawn structure now is very much like the one in the Yates variation of the Ruy Lopez. White has a strong center, but Black's free piece play allows  him a chance to eventually attack and destroy the center. 11. h2h3  11... g4h5  12. a1c1 So deviates from the move that brought him success earlier, and  chooses a promising side line which he obviously analyzed extensively as  well. 12... b6a5 Carlsen bets on the \"outpost play.\" In the meantime,  he frees himself from the passive bishop. 13. e1g1 