1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. g1f3  3... d5c4  4. e2e4  4... b7b5  5. a2a4  5... c7c6  6. b1c3 A rare move, but the game will quickly transpose to a well-known position. 6... f8b4 Now we're back to a position with more than a thousand games played. It makes sense for Black to try to exploit White's move order with the move 6...b4. Considering the time spent, it's likely Tan didn't expect this opening and was improvising from this moment on. 7. c1d2  7... d8b6 Another rare move, this time leading to truly unexplored positions already on move eight, something we also saw in the first game of the match. 8. f1e2  8... g8e7 A new move. It makes sense to develop the knight here, to escape from the move e4-e5. 9. d1c2 By protecting the knight, White prepares the thematic break on b3. 9... c8b7  10. b2b3 [%c_effect b3;square;b3;type;GreatFind;persistent;true] 10... c4b3  11. c2b3  11... a7a5 [%c_effect a5;square;a5;type;GreatFind;persistent;true] It's necessary to return the pawn. Exchanging the dark-squared bishop would be positional suicide. 12. a4b5  12... c6b5  13. e2b5  13... b7c6  14. b5d3 Keeping the bishops gives more chances for an advantage. 14... b8d7  15. e1g1  15... e8g8  16. a1b1  16... f8b8 [%c_effect b8;square;b8;type;Mistake;persistent;true] This move puts Black in trouble. 17. d2f4 [%c_effect f4;square;f4;type;GreatFind;persistent;true] This is the problem—the bishop attacks the rook, and White gains precious time to prepare Na2. 17... b8d8  18. c3a2 [%c_effect a2;square;a2;type;GreatFind;persistent;true] This bishop cannot move, and White is much better. 18... d7f6  19. f4g5 [%c_effect g5;square;g5;type;Inaccuracy;persistent;true] 19... a8b8 [%c_effect b8;square;b8;type;Mistake;persistent;true] 20. d4d5 [%c_effect d5;square;d5;type;GreatFind;persistent;true] The thematic central advance is possible thanks to a tactical detail. 20... c6e8  21. b3b2 [%c_effect b2;square;b2;type;Inaccuracy;persistent;true] White has many tempting moves, and it's hard to pick the most accurate. This has always been a flaw in my game: being an indecisive person by nature, I find it difficult to choose just one of several tempting moves. Of course, many other chess players also suffer from this. 21... e7g6  22. f1c1 [%c_effect c1;square;c1;type;Inaccuracy;persistent;true] Again, White has many interesting moves, and this is not the most impressive. 22... h7h6 [%c_effect h6;square;h6;type;GreatFind;persistent;true] 23. g5e3  23... b6b7  24. a2b4  24... a5b4  25. b1a1  25... b8c8 This move is criticized by the computer, although its suggested refutation is not so clear to my eyes. 26. c1c8  26... b7c8  27. b2b4  27... e6d5  28. e4e5  28... f6e4  29. a1c1  29... c8e6 White has some advantage, but not enough for a win. This evaluation will not change for a long time. 30. b4a5  30... d8b8  31. a5c7  31... b8a8  32. h2h3  32... e6e7  33. c7e7  33... g6e7  34. f3d4  34... e7g6  35. e5e6  35... f7e6  36. d4e6  36... e8f7  37. e6c7  37... a8d8  38. e3d4  38... g6f4  39. d3a6  39... e4g5  40. d4e5  40... f4g6  41. e5d4  41... g6f4  42. h3h4  42... g5e6  43. c7e6  43... f4e6 For now, Tan is defending very well. 44. d4e5  44... h6h5  45. a6d3  45... d8e8  46. f2f4  46... e8d8  47. g1f2  47... e6f8  48. c1c6  48... d8a8  49. d3f5  49... f8h7  50. f2e3  50... a8a3  51. e5c3  51... a3a8  52. c6d6  52... a8e8  53. c3e5  53... h7f6  54. d6a6  54... f6e4 Sacrificing a pawn to arrive in a position with opposite colored bishops, where drawing chances are usually very high. 55. e3d4 White declines the offer. 55... e4g3  56. f5d3  56... g3e4  57. a6a7  57... e8c8  58. e5c7  58... c8e8  59. c7e5  59... e8c8  60. a7a3  60... g8f8  61. a3b3  61... c8a8  62. b3b8 With this move, White practically accepts that there's no way to avoid a draw. But there's still a surprise to come. 62... a8b8  63. e5b8  63... g7g6  64. d4e5 