1. c2c4  1... e7e6  2. b1c3  2... d7d5  3. d2d4  3... h7h6 A curious move that has become popular recently. The idea is to avoid the development of the white bishop to g5. 4. g1f3  4... g8f6  5. c1f4  5... f8d6  6. f4d6  6... d8d6  7. c4c5 Duda played this move quickly, so I assume it's home preparation. It's usually difficult to decide on this pawn advance because we instinctively want to maintain greater control of the center with the pawn on c4. Additionally, White needs to keep an eye on Black's breaks with e6-e5 and b7-b6. I emphasize again the importance of the pawn play, which will be the central positional theme in this game. 7... d6e7  8. e2e3  8... e8g8  9. b2b4 An important moment. Black must choose a plan of action. 9... c7c6  10. f1e2  10... a7a6 [%c_effect a6;square;a6;type;Interesting;persistent;true] Black simply wants to put the knight on d5 and then play e5-e4 and attack the kingside. 11. e1g1  11... b8d7  12. a2a4  12... e6e5  13. d1c2  13... e5e4  14. f3d2  14... f6h7  15. b4b5  15... f7f5 This natural move turns out to be a novelty. 16. d2b3 The knight is ready to go to a5. The position is complex and it's not clear that this is the best plan. 16... a6a5 Idani, for now, takes the a5-square from the knight. 17. c2d2 [%c_effect d2;square;d2;type;GreatFind;persistent;true] Duda's intentions become clear on the next move. 17... g7g5 [%c_effect g5;square;g5;type;Mistake;persistent;true] This is too optimistic. Black needed a more subtle move. 18. b3a5 [%c_effect a5;square;a5;type;GreatFind;persistent;true] Duda thought for more or less 15 minutes before executing this excellent move.