context: 1. e2e4  1... c7c5  2. g1f3  2... e7e6  3. d2d4  3... c5d4  4. f3d4  4... b8c6  5. b1c3  5... d8c7 It amazes me how Carlsen can play several different variations of the Sicilian as Black, all with equal skill. 6. c1e3  6... a7a6  7. a2a3 This move looks harmless, but it's more interesting than it seems. The main idea is to prevent the ...Bb4 that is so typical of the Taimanov Defense. Besides, a3 ends up being useful anyway in many variations, since it prevents b5-b4. 7... c6d4 Despite being a typical move, the knight exchange is rarely played in this order of moves. It will certainly become more popular after this game. 8. d1d4 The natural capture. 8... b7b5  9. f1e2 A smart move, keeping the option of castling on both flanks. 9... c8b7  10. e1c1 This leads to a position that has never been tested in classical grandmaster play. 10... a8c8  11. c1b1  11... g8f6  12. e4e5  12... f6d5  13. c3d5  13... b7d5 Now Black is fine since White has to lose a tempo in order to defend the c2-pawn. 14. e2d3  14... d5g2 Black could have simply finished development with an equal position, but Carlsen decides to capture the pawn, a bold decision that is approved by the computer. I suppose many humans wouldn't dare open the g-file, but Carlsen's instincts, sense of danger, and precision when evaluating a position aren't matched by anyone. 15. h1g1  15... g2d5  16. h2h4 The position remains far from clear. 16... g7g6  17. d4f4 Arjun decides to move the king to the side, giving the d4-square to the bishop if it becomes necessary to protect the e5-pawn. 17... f8e7 