| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. J Balin vs J Lahner |
| 1-0 | 47 | 2000 | CZE-ch U16 | A40 Queen's Pawn Game |
| 2. J Worek vs J Lahner |
| 0-1 | 59 | 2001 | Karvina | E32 Nimzo-Indian, Classical |
| 3. J Lahner vs J Michenka |
| 0-1 | 27 | 2001 | Karvina | E06 Catalan, Closed, 5.Nf3 |
| 4. J Lahner vs J Sikora-Lerch |
| ½-½ | 34 | 2001 | Karvina | A65 Benoni, 6.e4 |
| 5. M Walach vs J Lahner |
| ½-½ | 64 | 2001 | Karvina | A19 English, Mikenas-Carls, Sicilian Variation |
| 6. J Lahner vs A Rogovskoy |
| ½-½ | 11 | 2001 | Karvina | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 7. A Chudinovskikh vs J Lahner |
| 0-1 | 76 | 2001 | Schneider Bohemia Open | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 8. J Lahner vs P Simacek |
| 0-1 | 21 | 2001 | Schneider Bohemia Open | A70 Benoni, Classical with 7.Nf3 |
| 9. P Freisler vs J Lahner |
| ½-½ | 35 | 2001 | Schneider Bohemia Open | A13 English |
| 10. J Lahner vs P Virostko |
| ½-½ | 9 | 2001 | Schneider Bohemia Open | A04 Reti Opening |
| 11. J Tuma vs J Lahner |
| 0-1 | 52 | 2001 | Schneider Bohemia Open | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 12. J Lahner vs D Seleljo |
| 0-1 | 27 | 2001 | Schneider Bohemia Open | E97 King's Indian |
| 13. A Jedlicka vs J Lahner |
| ½-½ | 45 | 2001 | Schneider Bohemia Open | E15 Queen's Indian |
| 14. J Lahner vs J Nun |
| 0-1 | 25 | 2001 | Schneider Bohemia Open | A58 Benko Gambit |
| 15. J Lahner vs V Belov |
| ½-½ | 59 | 2002 | Komercni Banka Open | D71 Neo-Grunfeld |
| 16. J Bernasek vs J Lahner |
| 1-0 | 17 | 2003 | CZE-ch U18/20 | E15 Queen's Indian |
| 17. P Michalik vs J Lahner |
| ½-½ | 10 | 2005 | Frydek Mistek Technomont Cup | C68 Ruy Lopez, Exchange |
| 18. J Lahner vs L Voloshin |
| ½-½ | 24 | 2005 | Stare Mesto op | A80 Dutch |
| 19. T Bromann vs J Lahner |
| 0-1 | 44 | 2006 | Pobeskydy Hamont 17th | A13 English |
| 20. V Dambrauskas vs J Lahner |
| 1-0 | 30 | 2006 | Pobeskydy Hamont 17th | E12 Queen's Indian |
| 21. B Heberla vs J Lahner |
| 1-0 | 49 | 2006 | Pardubice Open-A | B50 Sicilian |
| 22. J Lahner vs J Vokoun |
| 0-1 | 51 | 2006 | Pardubice Open-A | A55 Old Indian, Main line |
| 23. F Bindrich vs J Lahner |
| 1-0 | 38 | 2006 | Pardubice Open-A | B92 Sicilian, Najdorf, Opocensky Variation |
| 24. J Lahner vs H Lehmann |
| ½-½ | 21 | 2006 | Pardubice Open-A | A52 Budapest Gambit |
| 25. O Yaksin vs J Lahner |
| ½-½ | 28 | 2006 | Pardubice Open-A | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
Kibitzing
