| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J Jirka vs Navara |
| 0-1 | 41 |
1993 |
CZE Czechia-ch U12 | B72 Sicilian, Dragon |
| 2. J Brychta vs J Jirka |
| 0-1 | 27 |
1994 |
Ch Czech Republic (cadets) (under 12) | C50 Giuoco Piano |
| 3. Voller Ondrej vs J Jirka |
| 0-1 | 42 |
1994 |
Ch Czech Republic (cadets) (under 12) | C55 Two Knights Defense |
| 4. J Stocek vs J Jirka |
| 1-0 | 38 |
1997 |
Plzen KB op-A U18 | D15 Queen's Gambit Declined Slav |
| 5. R Herskovic vs J Jirka |
| 0-1 | 22 |
1998 |
Junior A | C30 King's Gambit Declined |
| 6. J Jirka vs G Sargissian |
| ½-½ | 43 |
1998 |
EU-ch U16 | D02 Queen's Pawn Game |
| 7. Karpov vs J Jirka |
| ½-½ | 26 |
1998 |
Simultan, Internet | D15 Queen's Gambit Declined Slav |
| 8. J Jirka vs Jobava |
| 1-0 | 25 |
1999 |
Wch U16 | D02 Queen's Pawn Game |
| 9. J Jirka vs Navara |
| 0-1 | 21 |
2000 |
KB Czech Open | D72 Neo-Grunfeld, 5.cd, Main line |
| 10. C Lupulescu vs J Jirka |
 | 1-0 | 34 |
2001 |
TCh-Europe Boys U18 | C47 Four Knights |
| 11. P Simacek vs J Jirka |
| 1-0 | 38 |
2001 |
Valoz Cup | C61 Ruy Lopez, Bird's Defense |
| 12. J Snaidr vs J Jirka |
| 0-1 | 32 |
2001 |
Schneider Bohemia Open | D15 Queen's Gambit Declined Slav |
| 13. F Hindermann vs J Jirka |
| 0-1 | 32 |
2001 |
EYCC B18 | C48 Four Knights |
| 14. V Dambrauskas vs J Jirka |
| 1-0 | 51 |
2001 |
Valoz Cup | D13 Queen's Gambit Declined Slav, Exchange Variation |
| 15. R Hardarson vs J Jirka |
| 1-0 | 18 |
2001 |
Valoz Cup | C22 Center Game |
| 16. P Neuman vs J Jirka |
| 0-1 | 40 |
2001 |
Schneider Bohemia Open | C30 King's Gambit Declined |
| 17. M Calzetta vs J Jirka |
| ½-½ | 40 |
2001 |
Valoz Cup | C45 Scotch Game |
| 18. J Jirka vs V Tuzil |
| ½-½ | 71 |
2001 |
Schneider Bohemia Open | D79 Neo-Grunfeld, 6.O-O, Main line |
| 19. J Jirka vs D Mastrovasilis |
| 0-1 | 36 |
2001 |
EYCC B18 | A57 Benko Gambit |
| 20. A Korobov vs J Jirka |
| 1-0 | 53 |
2001 |
TCh-Europe Boys U18 | D15 Queen's Gambit Declined Slav |
| 21. J Jirka vs S Estremera Panos |
| 1-0 | 39 |
2001 |
Valoz Cup | D02 Queen's Pawn Game |
| 22. J Jirka vs A Chudinovskikh |
| 1-0 | 39 |
2001 |
Schneider Bohemia Open | A62 Benoni, Fianchetto Variation |
| 23. J Jirka vs D Stojanovski |
| 0-1 | 46 |
2001 |
EYCC B18 | A57 Benko Gambit |
| 24. J Jirka vs N V Pedersen |
| 1-0 | 35 |
2001 |
Valoz Cup | E01 Catalan, Closed |
| 25. I Porat vs J Jirka |
| 0-1 | 42 |
2001 |
Schneider Bohemia Open | D11 Queen's Gambit Declined Slav |