1. d2d4  1... g8f6  2. c2c4  2... g7g6  3. b1c3  3... d7d5  4. c4d5  4... f6d5  5. e2e4  5... d5c3  6. b2c3  6... f8g7  7. f1c4  7... c7c5  8. g1e2  8... b8c6  9. c1e3  9... e8g8  10. e1g1 The Grunfeld was to be expected as the  players had an over-the-board discussion at the end of the last year in  Monaco. 10... b7b6 The Grunfeld's most common pawn sacrifice. 11. d4c5 Now forcing play follows. 11... d8c7  12. e2d4  12... c6e5  13. d4b5  13... c7b8  14. c4d5  14... e5g4  15. g2g3  15... a7a6 And Lagno sacrifices the exchange. Also a common  Grunfeld, or rather any fianchettoed opening's idea. 16. d5a8  16... g4e3  17. f2e3  17... a6b5  18. a8d5  18... b8c7  19. c5b6  19... c7b6  20. d1e2  20... e7e6  21. d5b3  21... c8b7 A logical move and a novelty. For the exchange and the pawn, Lagno has a bunch of  positional pluses: a safer king, two bishops, and a better pawn structure.  22. b3c2  22... b5b4 Moving the pawn out of the danger zone. 23. a1b1  23... g7c3  24. a2a3 Koneru squeezes the maximum from the pin. 24... f8d8 An active move that, however, is based on a tactical oversight. 25. a3b4 Koneru is not impressed by the threat as she sees an even  stronger one. 25... d8d2  26. e2f3 The point. 26... f7f5  27. f1f2 It seems as White defended everything, but... 27... d2c2  Lagno has one more trick up her sleeve. 28. f2c2  28... b7e4  29. f3e4 The most practical way, which Koneru chose  after almost four precious minutes on her clock. The most important  concern is that White does not risk losing with the rooks versus the  queen. 29... f5e4 