1. e2e4  1... c7c5  2. b1c3  2... d7d6  3. f2f4  3... g7g6  4. g1f3  4... f8g7  5. f1b5 This move begins a more subtle way of playing the Grand Prix Attack, one of the most dangerous lines of the Sicilian. 5... c8d7 Clearly the best way to block the check. 6. b5c4 I'm not a great expert on the Grand Prix Attack and its subtleties, so I'm afraid I'd need a few hours to understand exactly what reasons lead White to leave Black's bishop on d7. Even without in-depth analysis, I will give a clue in the following moves as to what I believe to be the reason. 6... b8c6  7. d2d3  7... c6a5 [%c_effect a5;square;a5;type;GreatFind;persistent;true] This move makes good use of the bishop on d7, since now White cannot return with the bishop to b5 (because of 8...Bxc3+). 8. c1d2 Necessary to avoid ...Bxc3 and to prepare White's following plan. 8... e7e6  9. d1e2  9... g8e7  10. e1c1 Vaishali had played all this before. To be honest, this whole line, exchanging the light-squared bishop and castling on the queenside into the middle of the fire, seems to me to be extremely dubious for White. But, as they say, \"fortune favors the bold.\" Nihal has also played this position, so maybe the Indian players have analyzed it together. 10... a7a6 I don't like this move, although it's one of the top options of the computer. I think it makes Black's subsequent play difficult in a practical game. 11. f4f5 [%c_effect f5;square;f5;type;GreatFind;persistent;true] White must be fast. 11... b7b5  12. f5f6 [%c_effect f6;square;f6;type;GreatFind;persistent;true] 12... g7f6  13. e4e5 [%c_effect e5;square;e5;type;GreatFind;persistent;true] 13... f6g7  14. c3e4  14... a5b7 [%c_effect b7;square;b7;type;Mistake;persistent;true] The move that deviates from Vaishali's previous game in this line is actually a losing mistake. 15. d2g5 [%c_effect g5;square;g5;type;Inaccuracy;persistent;true] 15... d7c6 [%c_effect c6;square;c6;type;Mistake;persistent;true] 16. c4e6 [%c_effect e6;square;e6;type;Brilliant;persistent;true] An excellent sacrifice that leads to a winning attack. 16... c6e4  17. e5d6 [%c_effect d6;square;d6;type;Mistake;persistent;true] A big mistake, giving Black one more chance to get back into the game. 17... b7d6 [%c_effect d6;square;d6;type;Mistake;persistent;true] The final mistake. 18. d3e4  18... d8b6  19. e4e5 The game is over. 19... d6f5  20. e6d7  20... e8f8  21. g2g4 