Sooner or later Black will have to exchange the c3-pawn for the h5-pawn.
1. e2e4  1... e7e5  2. g1f3  2... b8c6  3. f1b5  3... a7a6  4. b5a4  4... g8f6  5. e1g1  5... f6e4  6. d2d4  6... f8e7 [%c_effect e7;square;e7;type;Interesting;persistent;true] A not-so-popular move but interesting to play as a surprise factor. It has been employed a few times by Carlsen, among others. 7. d4e5 [%c_effect e5;square;e5;type;Inaccuracy;persistent;true] A harmless move, indicating that Kosteniuk was surprised by Koneru's opening choice. 7... e4c5  8. a4c6  8... d7c6  9. d1e2  9... c8g4  10. h2h3  10... g4h5 This move, surprisingly, is innacurate. 11. f1d1 This natural move is a novelty. 11... d8c8  12. c1e3  12... c5e6  13. b1d2  13... h5g6  14. e2c4  14... c6c5  15. a2a4  15... e8g8 The position is a little more comfortable for Black, thanks to the pair of bishops. 16. d2f1 [%c_effect f1;square;f1;type;Inaccuracy;persistent;true] 16... f8d8  17. f1g3  17... d8d1  18. a1d1  18... c8e8  19. h3h4  19... b7b5  20. c4e2  20... h7h6  21. h4h5  21... g6h7  22. a4b5  22... a6b5  23. c2c4 [%c_effect c4;square;c4;type;Inaccuracy;persistent;true] This makes things worse. 23... b5c4 [%c_effect c4;square;c4;type;GreatFind;persistent;true] 24. e2c4  24... a8b8 Now the rook is more active and can go to b4. The b-pawn becomes a target. 25. c4a2  25... e8b5  26. d1d2  26... b5c6  27. a2a3  27... b8b4  28. d2d1  28... b4a4  29. a3c3  29... c6b5  30. d1d2  30... e7f8  31. g3e2 [%c_effect e2;square;e2;type;Inaccuracy;persistent;true] This move allows Black to improve the bishop. It is better to make a random waiting move. 31... h7e4  32. b2b3 [%c_effect b3;square;b3;type;Inaccuracy;persistent;true] 32... a4b4  33. e2c1  33... e4f3  34. g2f3  34... c5c4 [%c_effect c4;square;c4;type;GreatFind;persistent;true] Black has a decisive advantage. Her pieces are more active, White's pawns are too weak, and the king is exposed. 35. d2b2  35... b5b7  36. e3d2  36... f8c5  37. b2b1  37... e6d4  38. g1g2  38... d4b3  39. d2e1  39... b3c1  40. b1b4  40... c5b4  41. c3c1  41... b4e1  42. c1e1 I've written in previous analysis that queen endgames are the most difficult in chess. \"A queen gives a lot of checks\" is a common saying among chess players. But no reason for Black to worry so much, as the position is still winning. 42... b7d5  43. e1b4  43... d5e5  44. b4b8  44... g8h7  45. b8b1  45... f7f5  46. b1b7  46... e5c5  47. b7a6  47... c4c3  48. a6g6  48... h7g8  49. g6e8  49... c5f8  50. e8c6 Now Black only has one winning move. 50... f8f6 [%c_effect f6;square;f6;type;Mistake;persistent;true] 51. c6c7  51... g8h7 