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 