1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... f8b4  4. e2e3  4... e8g8  5. f1d3  5... d7d5  6. a2a3  6... b4c3  7. b2c3  7... d5c4  8. d3c4  8... c7c5  9. g1e2 The advantage of this move over the more natural development of the knight on f3 is that it can now go to g3, supporting the advance of the e-pawn. 9... d8c7  10. c4a2  10... b7b6  11. e1g1  11... c8a6 An excellent diagonal for the bishop. 12. f1e1  12... b8c6  13. e2g3  13... f8d8  14. a1b1 This move was a novelty by Caruana, and the idea becomes clear in a moment. 14... a8c8  15. b1b2 [%c_effect b2;square;b2;type;GreatFind;persistent;true] This is the idea: the rook prepares to travel to d2 and defend the d4-pawn, thus enabling the e3-e4 advance. This idea is known from many openings, including the Nimzo-Indian itself, although the rooknormally travels from a2. This is one of the secrets of high-level chess—using similar ideas in different positions. Giri used the same pattern in his excellent win against Gukesh in the Tata Steel tournament. 15... e6e5 [%c_effect e5;square;e5;type;Inaccuracy;persistent;true] Only now does the game deviate from Caruana's previous experiences, but this novelty is a mistake. 16. d4d5  16... e5e4 Otherwise White plays e4. Black prepares to drive the knight to d3, but White avoids this with her next move. 17. d1a4 [%c_effect a4;square;a4;type;GreatFind;persistent;true] 17... c6a5 A sad necessity. This is the only way to defend both attacked pieces. 18. c3c4 Strategically, the position is very dangerous for Black, as White has the bishop pair and a protected passed pawn. Furthermore, the black pieces on the queenside find it difficult to participate in the game. White's plan is simple: take the rook off b2 and put a bishop in its place. Black needs to act quickly. 18... h7h5 [%c_effect h5;square;h5;type;Interesting;persistent;true] 19. f2f4 [%c_effect f4;square;f4;type;Inaccuracy;persistent;true] I liked this move very much the first time I saw it. Black cannot capture this pawn, and as a result, White's structure improves even further. But the computer disagrees and proves this to be a mistake. 19... c7d7 [%c_effect d7;square;d7;type;Inaccuracy;persistent;true] Not such a bad move, but there is a better option. 20. a4d7 [%c_effect d7;square;d7;type;Inaccuracy;persistent;true] 20... d8d7  21. b2c2  21... h5h4  22. g3f5  22... f6e8 [%c_effect e8;square;e8;type;GreatFind;persistent;true] The knight heads to d6 to attack the c4-pawn. 23. c1b2  23... f7f6  24. e1c1  24... g8f7  25. g1f2  25... c8c7 [%c_effect c7;square;c7;type;Mistake;persistent;true] This is a clear mistake. This is a very unfortunate square for the rook. 26. f5h4  26... e8d6  27. g2g4 [%c_effect g4;square;g4;type;GreatFind;persistent;true] 27... a5c4  28. c2c4 [%c_effect c4;square;c4;type;GreatFind;persistent;true] It's vital for White to capture this knight the right way. 28... a6c4  29. c1c4 [%c_effect c4;square;c4;type;GreatFind;persistent;true] Kosteniuk probably underestimated this move. 29... d6c4  30. a2c4 The three pieces, together with the d-pawn, create dangerous threats. 30... b6b5  31. c4b5 If the black rook were on c8, as it had been for a long time, then 31...Rb7 would win here. There are so many \"ifs\" in life—this is just one more. 31... c7b7  32. b5d7  32... b7d7  33. h4f5  33... d7d5  34. f2e2 The endgame is easily winning. Kosteniuk has escaped many difficult positions throughout the tournament, but this time she finally fails. But she still ended up achieving what really mattered—the tournament victory. 34... g7g6  35. f5h6  35... f7e6  36. f4f5  36... g6f5  37. g4f5  37... e6e7  38. h2h4  38... c5c4  39. h6g8  39... e7f7  40. g8f6  40... d5f5  41. f6e4  41... f5h5  42. e4d6  42... f7e6  43. d6c4  43... h5h4 The best that could happen for Black here would be to end up with a king, bishop, and knight versus king endgame. What do you do in these positions $2 Do you continue playing to see if your opponent knows how to mate $2 I would resign right away, but I've always been a pessimist. 44. b2d4  44... e6d5  45. e2d3  45... h4g4  46. c4d2  46... d5c6  47. d2e4  47... a7a5  48. e4c3  48... g4g1  49. d3c4  49... g1a1  50. c4b3  50... c6b7  51. b3a4  51... b7a6  52. c3e4  52... a1b1  53. e4c5  53... a6b6  54. c5b3  54... b6a6  55. d4c3  55... b1h1  56. c3a5  56... h1h5  57. a5b4  57... a6b6  58. b3d4 