1. g1f3  1... d7d5  2. g2g3  2... g7g6  3. f1g2  3... f8g7  4. d2d4  4... g8f6  5. e1g1  5... e8g8  6. c2c4  6... c7c6  7. d1a4 A relatively rare move, championed by Oparin. 7... f6d7 Erigaisi played this without much hesitation. The text move initiates a nice regrouping by Black. 8. a4b3 This and the next few moves were played practically in a blitz tempo by Praggnanandhaa. 8... a7a5 A novelty, although the advance of the a-pawn is a common theme in the Grunfeld. 9. c4d5  9... a5a4 The point. 10. b3d1  10... c6d5  11. b1c3  11... d7b6  12. c1f4  12... b8c6 This is why Arjun held his knight on its initial position. Black is harmoniously regrouped now. 13. a1c1  13... a8a5 [%c_effect a5;square;a5;type;GreatFind;persistent;true] Not only does Black stop the Nc3-b5 threat, but this is another nice regrouping. 14. b2b3  14... a4b3  15. a2b3  15... c8g4  16. f3e5 The only try for an advantage by Praggnanandhaa. 16... g4e6  17. d1d2  17... d8a8 The slightly mysterious …Ra8-a5 move starts to yield Black dividents. An open file, in this case. 18. e2e3 