1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. c1d2 This is considered to be one of the  most harmless continuations against the Nimzo-Indian, but it was used in  the past by Alekhine. 4... e8g8  5. g1f3  5... c7c5  6. a2a3  6... b4c3  7. d2c3  7... f6e4  8. a1c1  8... b7b6  9. g2g3  9... c8b7  10. f1g2  10... e4c3 Aronian hurries to get rid of the bishop pair. 11. c1c3  11... c5d4  12. d1d4  12... b8c6  13. d4d2 An obvious move and a novelty,  which both players were hardly aware of.