1. d2d4  1... g8f6  2. c2c4  2... e7e6  3. g1f3  3... d7d5  4. b1c3  4... c7c6  5. e2e3  5... b8d7 A relatively slow start of the opening, a solid Meran, but things are going to change very soon. 6. f1d3  6... d5c4  7. d3c4  7... b7b5  8. c4d3  8... c8b7  9. e1g1  9... a7a6  10. e3e4  10... c6c5  11. e4e5 Duda has  prepared something... 11... f6d5  12. f3g5  12... d5c3  13. b2c3  13... f8e7  14. g5e6 That is the  novelty by the Polish GM! Such a blow is very common when the enemy king  is stuck in the center. The sacrifice is, as a rule, explosive by nature:  White is searching for a quick mate. However here, Duda aims for a  long-term attack. 14... f7e6  15. d1h5  15... g7g6  16. d3g6 