| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. V Krishnamoorthy vs K Stupak |
| 0-1 | 56 |
2005 |
BELFORT YWCC Boys Under 16 | C01 French, Exchange |
| 2. K Stupak vs T Sanikidze |
| 1-0 | 37 |
2005 |
BELFORT YWCC Boys Under 16 | A46 Queen's Pawn Game |
| 3. K Stupak vs Ngoc Truongson Nguyen |
| ½-½ | 92 |
2005 |
BELFORT YWCC Boys Under 16 | E18 Queen's Indian, Old Main line, 7.Nc3 |
| 4. K Szabo vs K Stupak |
| ½-½ | 47 |
2005 |
BELFORT YWCC Boys Under 16 | C11 French |
| 5. K Stupak vs O Maiorov |
| 1-0 | 31 |
2005 |
ch-BLR U20 | E17 Queen's Indian |
| 6. B Kharchenko vs K Stupak |
| 1-0 | 25 |
2005 |
BELFORT YWCC Boys Under 16 | B50 Sicilian |
| 7. K Stupak vs E Pileckis |
| 0-1 | 51 |
2006 |
European Youth Championship | E05 Catalan, Open, Classical line |
| 8. K Stupak vs F Bindrich |
| ½-½ | 58 |
2006 |
European Youth Championship | A46 Queen's Pawn Game |
| 9. C Ponizil vs K Stupak |
| 0-1 | 21 |
2006 |
European Youth Championship | C04 French, Tarrasch, Guimard Main line |
| 10. O Yuzhakov vs K Stupak |
| 0-1 | 45 |
2006 |
European Youth Championship | C11 French |
| 11. A Baryshpolets vs K Stupak |
| ½-½ | 61 |
2006 |
European Youth Championship | D30 Queen's Gambit Declined |
| 12. K Stupak vs Blatny |
| 1-0 | 51 |
2006 |
Czech Open A | A40 Queen's Pawn Game |
| 13. K Stupak vs T Pym |
| 1-0 | 27 |
2006 |
European Youth Championship | A62 Benoni, Fianchetto Variation |
| 14. B Mitrovic vs K Stupak |
| 1-0 | 38 |
2006 |
European Youth Championship | A03 Bird's Opening |
| 15. M Pacher vs K Stupak |
| 0-1 | 56 |
2008 |
EU-ch U18 18th | D35 Queen's Gambit Declined |
| 16. B Deruni vs K Stupak |
| 0-1 | 72 |
2008 |
World Junior Championship | E10 Queen's Pawn Game |
| 17. K Stupak vs O Yaksin |
| ½-½ | 24 |
2008 |
World Junior Championship | E04 Catalan, Open, 5.Nf3 |
| 18. I Rozum vs K Stupak |
| ½-½ | 60 |
2008 |
EU-ch U18 18th | E00 Queen's Pawn Game |
| 19. B Amin vs K Stupak |
| 0-1 | 86 |
2008 |
World Junior Championship | B30 Sicilian |
| 20. K Stupak vs G Froewis |
| 1-0 | 41 |
2008 |
EU-ch U18 18th | E06 Catalan, Closed, 5.Nf3 |
| 21. O Abdulov vs K Stupak |
| 1-0 | 31 |
2008 |
World Junior Championship | C01 French, Exchange |
| 22. K Stupak vs A Volodin |
| 1-0 | 52 |
2008 |
EU-ch U18 18th | A30 English, Symmetrical |
| 23. K Stupak vs R Mamedov |
| 1-0 | 69 |
2008 |
World Junior Championship | A45 Queen's Pawn Game |
| 24. V Kulakov vs K Stupak |
| 1-0 | 40 |
2008 |
World Junior Championship | A46 Queen's Pawn Game |
| 25. K Stupak vs T Burg |
| 1-0 | 23 |
2008 |
EU-ch U18 18th | A45 Queen's Pawn Game |