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 