1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. b1c3  3... d7d5  4. c4d5  4... e6d5  5. c1g5  5... f8b4 Another recent opening trend, spicing the game a bit compared to the more solid 5...Be7. 6. e2e3  6... h7h6  7. g5f4 A rare move that has been played by Keymer before. 7... c8f5  8. f1d3  8... f5d3  9. d1d3  9... c7c6 Carlsen improves Black's play compared to the earlier Keymer game. 10. g1e2  10... f6h5 [%c_effect h5;square;h5;type;GreatFind;persistent;true] 11. f4e5  11... b8d7  12. h2h3 Creating a retreat route for the bishop. 12... h5f6  13. e5h2  13... e8g8 Carlsen's opening play was a success: the position is equal. Compared to normal Queen's Gambit Declined positions, the light-squared bishops have been exchanged and this clearly favors Black: the position is simplified and the c4-square is weakened after White's typical plan of advancing the pawn minority on the queenside. 14. a2a3  14... b4a5 It's hard to say where the bishop is better placed. Another option was to retreat it to e7. 15. e1g1  15... f8e8  16. a1c1 It's not so clear that the rook is useful on c1. The more natural option is to start the advance of the pawns on the queenside immediately. 16... d8e7  17. b2b4  17... a5d8  18. e2g3 The knignt heads to f5. 18... d8c7  19. g3f5  19... c7h2  20. g1h2  20... e7e6  21. f5g3  21... e6d6 We're not used to Carlsen losing a chess game, let alone in this kind of technical position where he has no problems. 22. h2g1  22... a7a5  23. d3b1  23... d7b6 This looks very good, but Keymer finds a tactical way to simplify the position. 24. b4a5  24... b6c4  25. b1b4 [%c_effect b4;square;b4;type;GreatFind;persistent;true] 25... a8a5  26. c3d5 [%c_effect d5;square;d5;type;GreatFind;persistent;true] A very important resource to avoid a worse position. 26... f6d5  27. b4c4  27... a5a3 Black has a passed b-pawn but White has a mobile center. 28. c4c5 A solid decision, forcing the queen exchange. 28... d6c5  29. c1c5  29... e8a8  30. g3f5  30... h6h5 Improving the pawn structure and getting ready to play ...g7-g6. Black has other options that don't change the evaluation. 31. g2g4  31... h5g4  32. h3g4  32... a3a2  33. f1b1  33... a2a1  34. b1a1  34... a8a1  35. g1g2  35... g8f8  36. g4g5 Both sides played natural moves and we arrive at the critical moment of the game. 36... d5c7 [%c_effect c7;square;c7;type;Mistake;persistent;true] An unfortunate blunder by Carlsen. Black loses a pawn and the game. From now on he doesn't have a chance. 37. f5d6 [%c_effect d6;square;d6;type;GreatFind;persistent;true] Suddenly Black is lost. White threatens not only the b7-pawn but also 38.Rf5. 37... g7g6  38. d6b7  38... a1b1 Keymer said he had many tempting options at this point and that it was difficult to judge which was the best. The way he played is quite good. 39. b7d8 [%c_effect d8;square;d8;type;GreatFind;persistent;true] 39... b1b5  40. c5b5  40... c6b5  41. d8c6  41... f8e8  42. c6b4 The knight is very well placed here, blockading the passed pawn. Black has no counterplay. There's an endgame rule that states that knight endgames are the closest to king and pawn endgames: usually a pawn advantage is enough to win. Another important detail is that there are pawns on both flanks and this helps White. 42... e8e7  43. f2f4 [%c_effect f4;square;f4;type;GreatFind;persistent;true] White's pawn chain makes a good impression. 43... e7d6  44. g2f3  44... c7e6  45. f3e2  45... e6g7  46. e3e4  46... g7h5  47. e2f3  47... h5g7  48. b4d3  48... g7h5  49. f3e3  49... h5g3  50. d4d5 The pawns are ready to go forward. 50... d6c7  51. e3d4  51... c7b6  52. d3e5  52... b5b4  53. e5f7  53... b4b3  54. f7e5  54... g3e2 