1. c2c4  1... e7e5  2. b1c3  2... g8f6  3. g1f3  3... b8c6  4. e2e4 This system is very popular nowadays. It was used, for instance, by Niemann in his victory against Mamedyarov in the Sinquefield Cup. 4... f8b4 Mamedyarov chose 4...Bc5, a more combative move that leads to complicated positions. The move played by Duda is more reliable. 5. d2d3  5... d7d6  6. a2a3  6... b4c5 I played many online games with White in this system, and many of my opponents preferred to play 6...Bxc3. Of course, it's too much criticism to call this capture a mistake, but it makes White's play much easier with the bishop pair, good central control, and a clear plan of attack on the kingside. 7. b2b4  7... c5b6  8. c1e3  8... c8g4  9. f1e2  9... e8g8  10. e1g1  10... g4f3  11. e2f3  11... c6d4  12. c3a4  12... c7c6 I found just one game with this move. 13. a4b6  13... a7b6 A new move. 14. e3d4  14... e5d4  15. d1d2  15... f6d7  16. f3g4  16... d7e5  17. g4d1 An unfortunate square for the bishop. Black's plan is to play g7-g5, so the bishop should be ready to land on f5. 17... g7g5 The knight must be secured on its excellent post. Of course, generally, we should not advance the pawns in front of our king, but there is a good reason for this concession. This idea is also very common in the Benoni Defense, among others. 18. f2f4 White decides to open the kingside immediately. The problem with this plan is that now the knight can never be dislodged from e5. It's reasonable to try 18.g3 before playing f4, but this doesn't give an advantage. 18... g5f4  19. f1f4  19... g8h8  20. f4f5  20... f8g8  21. a3a4  21... g8g7  22. d1e2  22... d8h4  23. f5h5  23... h4e7 Despite the open g-file and the monster e5-knight, it's not easy for Black to make progress. The computer assesses the position as equal. But Mitrabha had lost the first game, so he evidently was not in the mood for playing safely and making a draw. His attempt to create active play on the queenside, however, will cost him the game. 24. d2b2 The queen is better placed on d2, controlling the dark squares around White's king. 24... c6c5  25. a4a5 This is too optimistic. Black is ready to start a devastating kingside attack now. 25... e7f6  26. h5f5  26... f6h6  27. a5b6 This allows a decisive combination. 27... h6e3  28. g1f1  28... a8g8  29. g2g3  29... g7g3 This move was begging to be played. 30. h2g3  30... e3g3 The combined attack of queen, rook, and knight is too strong. 31. e2f3  31... g3g1 