context: 1. d2d4  1... d7d5  2. c2c4  2... d5c4  3. g1f3  3... a7a6  4. e2e3  4... b7b5 A much riskier line than the traditional ways of playing the Queen's Gambit Accepted with Nf6-e6-c5. Black's idea is not to end up with an extra pawn, because that is impossible, but to change the pawn structure on the queenside. 5. a2a4 Necessary to recover the pawn. 5... c8b7  6. b2b3  6... g8f6  7. b3c4 The best way to fight for an advantage. It's useful for White to leave the pawns on the a-file. 7... b5b4 Another risky and unusual decision, since White ends up with a formidable pawn center. Here it's perhaps possible to compare the styles of both chess players, with Keymer being a legitimate heir to the European tradition of classical chess (Emanuel Lasker, the second world champion, was also German), featuring positional chess in which moves that break strategic patterns are rarely found. Aravindh, on the other hand, is a representative of the modern chess of India, where chess has become very popular more recently and in which the legacy of ancient positional laws gives way to the computer's cold calculating vision, in which there are no strange moves, only good or bad ones. 8. c4c5 The most direct attempt to refute Black's play. 8... b8c6  9. d1b3  9... e7e5 A new move, certainly prepared at home (or at the hotel room.) 10. f1c4 The critical reaction. 10... d8d7  11. c1b2 White loses any chance of an advantage after this move. 11... e5d4  12. b2d4  12... f6e4 Attacking the c5-pawn. 13. b3c2  13... d7g4  14. c4e2  14... c6d4 Black takes a safe decision, but there's something even better. 15. f3d4  15... g4g2  16. e2f3  16... b4b3 The only move. 17. f3g2 White has to go for the endgame. 17... b3c2  18. b1d2  18... e4c5  19. g2b7  19... c5b7 After the c2-pawn is captured, Black still remains a pawn up, but White has fair drawing chances. 20. e1e2  20... f8b4  21. h1c1  21... b4d2  22. e2d2  22... e8c8  23. c1c2  23... h8e8 The position is very unpleasant: apart from the material advantage, Black can exploit the weak pawns on the kingside. In case all rooks are exchanged, the knight endgame is easily winning. 24. a1g1  24... g7g6  25. c2c6  25... d8d6  26. g1c1  26... d6c6  27. c1c6  27... b7d6  28. f2f3  28... c8b7  29. c6c5  29... e8e5  30. c5c2  30... c7c5  31. d4e2  31... e5h5  32. d2e1  32... b7b6 The c-pawn is moving forward and White's pieces are too passive. Black has no problems converting the advantage. 33. e2f4  33... h5e5  34. e3e4  34... c5c4  35. e1d2  35... f7f5 Breaking up the pawn structure. 36. d2e3  36... f5e4  37. e3d4  37... e5e8 