[%c_effect h5;square;h5;type;GreatFind;persistent;true]
1. d2d4  1... d7d5  2. c2c4  2... e7e6  3. g1f3  3... g8f6  4. b1c3  4... c7c6  5. c4d5  5... e6d5  6. c1f4  6... c8f5  7. e2e3  7... b8d7  8. h2h3 This seemingly harmless system has already been played by many strong players, including Carlsen. With his last move, White, in addition to freeing a square back to the bishop on h2, prepares to play g4 and then possibly Nh4, capturing the bishop. 8... f8b4 This is probably not the most accurate, although it's certainly playable. 9. d1b3  9... d8b6  10. g2g4  10... f5g6  11. f3h4 [%c_effect h4;square;h4;type;GreatFind;persistent;true] 11... b4e7 A new move. The bishop returns to e7 anyway, so it's possible to say that his trip to b4 was not the best, but this is not a big deal. 12. h4g6  12... h7g6  13. f2f3 A typical move to take the e4-square from the knight and be able to take the king to f2. 13... d7f8 Maneuvering the knight to e6. 14. f4g3  14... f8e6  15. e1f2  15... e7d8 [%c_effect d8;square;d8;type;Interesting;persistent;true] With the idea of exchanging bishops with Bc7. The strategy of fighting against the pair of bishops, trying to exchange one of them, is well known. Arjun, however, prevents this with his following two moves. 16. f2g2  16... d8c7  17. g3f2 [%c_effect f2;square;f2;type;GreatFind;persistent;true] 17... c7d6 The bishop made a curious triangulation. It is undeniable that he is better placed on d6 than he was on e7. 18. h3h4  18... b6c7 [%c_effect c7;square;c7;type;Inaccuracy;persistent;true] I don't really like this move, it seems a little superficial. The queen is not well placed on c7 and a potential exchange is not so bad for Black. 19. f1e2 [%c_effect e2;square;e2;type;Inaccuracy;persistent;true] A timid move, uncharacteristic of Arjun. 19... e8g8  20. a1e1 Not the easiest of moves to play, since it's not clear what the rook is doing on e1. It gives the queen the option to go back to d1, something that can be helpful in some lines to attack a knight on h5. White certainly alternatives. 20... b7b5 [%c_effect b5;square;b5;type;GreatFind;persistent;true] Possibly this was Black's plan when avoiding the queen exchange: to begin an advance on the queenside. 21. g4g5 