context: 1. e2e4  1... c7c6  2. g1f3  2... d7d5  3. b1c3 The Two Knights Variation is a good choice for White in the Caro-Kann, ideal for someone who likes to play with the bishops, since in the main line Black quickly exchanges the light-squared bishop for a knight. This reason is probably why it was one of the favorite lines of Bobby Fischer; the American genius had a well-documented preference for positions with a bishop against a knight. 3... c8g4  4. h2h3  4... g4f3  5. d1f3  5... e7e6  6. f1e2 The most popular move nowadays. Interestingly, Keymer is quite used to playing this position as Black, having last played it in an important Olympiad game last year. 6... g8f6  7. e1g1  7... d5d4 It's often said that knights prefer closed positions. If we look at it from that perspective, this move makes a lot of sense, especially since it gains time by threatening the white knight. Fortunately, things in chess are more complicated than that, which is why it's so fascinating. 8. c3b1  8... f8d6  9. c2c3 A rare move. 9... c6c5  10. c3d4  10... c5d4  11. b1a3  11... e8g8  12. a3c4  12... d6c7  13. d2d3 So far, natural play by both sides. Here Black has the option of immediately attacking the c4-knight, although this doesn't change the evaluation of the position (equality). 13... b8c6  14. a2a4 Keymer decides to secure the knight against b7-b5. 14... a7a6 And Praggnanandhaa decides to push b7-b5 anyway. 15. g2g3 This gives the queen a retreating square. 15... b7b5 The natural follow-up. 16. c4a3  16... a8b8  17. a4b5  17... a6b5  18. c1g5 An unpleasant pin, simultaneously vacating the c1-square for the rook. 18... c7d6  19. f1c1  19... c6e5  20. f3g2  20... e5d7 The knight returns before White plays f2-f4. 21. a3c2 Attacking the pawn on d4. White also has another idea, which will be seen in the next move. 21... d8b6  22. b2b4 An excellent prophylactic move, preventing Black's knight from going to c5. White's position has improved, and he now has the typical microadvantage that is promised by the Two Knights Variation of the Caro-Kann. 22... e6e5  23. h3h4 A somewhat mysterious move, although it doesn't change much, given the slow character of the position. 23... b8a8  24. g2f1  24... f8c8  25. a1a8  25... c8a8  26. c1a1  26... b6c6  27. a1a8  27... c6a8  28. f1c1 The position looks harmless, but Black still needs to be careful: if White organizes his pieces, the advantage of the bishop pair can be felt. My impression is that Praggnanandhaa now played a bit too slowly. 28... a8b7  29. e2d1  29... f6e8  30. g5d2 White is preparing Ne1-Nf3-Bb3. 30... d7b8  31. c2e1  31... b8c6 Black counterattacks by pressing the pawn on b4. 32. d1b3  32... c6b4 This changes the character of the game. 33. d2b4  33... d6b4  34. e1f3  34... b7e7 A blunder. 35. c1c6  35... h7h6 Necessary prophylaxis. 36. c6b5  36... b4d6  37. h4h5  37... e8f6  38. f3h4  38... e7d7 Black is holding for now, but the position is very difficult in practice. The light-squared bishop is a monster, and the difference in activity of the knights is also very clear. The f7-pawn will be a constant source of headache. 39. b5a6  39... g8h7  40. a6a2  40... h7g8  41. a2a8  41... d7e8  42. a8a6 The position is a nightmare to defend, since White can try different plans. It's not a surprise that Black quickly makes a mistake. 42... d6f8  43. a6b6 The idea is to play Nf3 and Qc7, for instance. Black is paralyzed. 43... f6h7  44. b6g6  44... h7g5 The position remains horrible, but at least not immediately losing. That said, this evaluation lasts only a few moves. 45. g6f5  45... e8b8  46. b3c4  46... f8d6  47. g1g2  47... g8f8 Now White is winning by force, and it's difficult to suggest good ideas for Black. 48. h4g6  48... f8g8  49. f5d7  49... d6f8  50. g6h4 Keymer keeps maneuvering. 50... f8d6  51. h4f5  51... d6f8  52. f5h4  52... f8d6  53. h4f3  53... b8f8  54. f3g5  54... h6g5  55. c4f7 White finally wins material. 55... g8h8  56. f7b3 It's like it's all over, but there are still some adventures left. 56... d6e7  57. d7e6  57... e7f6  58. b3c4  58... h8h7  59. e6f5  59... h7h8  60. f5g6  60... f6e7  61. c4f7  61... e7b4  62. g6f5 White is patiently waiting for the best moment to strike. 62... b4d6  63. g2h3  63... d6e7  64. h3g4  64... e7f6  65. f7e6  65... f8e7  66. f2f4  66... g5f4  67. g3f4  67... e7d6  68. e6c4  68... d6b8  69. c4d5  69... e5f4  70. e4e5  70... f6e5 Amazingly, the position is drawn now. 71. d5e4  71... h8g8  72. f5e6  72... g8h8  73. e6g6  73... b8c8  74. e4f5  74... c8g8  75. g4f3  75... e5f6 