So does Aronian.
1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. g1f3  3... c7c6  4. e2e3  4... f8d6  5. b1c3  5... f7f5 In a must-win situation Giri chooses the Stonewall. 6. f3e5  6... g8f6  7. f1e2  7... e8g8  8. e1g1  8... c8d7 Giri chooses to maneuver his bishop on the kingside, the most aggressive option. 9. f2f4 The most unpleasant approach by Aronian, taking into consideration the match situation. The blocked nature of the position allows him a chance to develop pressure without too much risk. 9... d7e8  10. c1d2  10... b8d7  11. d2e1 That's a novelty, but it is quite an obvious move as well. The bishop is heading to a better position, just like the black Be8 earlier. 11... a7a5 Disrupts the queenside expansion. 12. a1c1 Prepares a timely trade on d5. 12... f6e4 And Giri finds nothing else but to try and seize some space in return. 13. c3e4  13... d5e4 