| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. J Hartung vs C Fucek |
| ½-½ | 20 | 1995 | World Championship U16 (boys) | C53 Giuoco Piano |
| 2. P A Martinez vs J Hartung |
| 0-1 | 40 | 1995 | World Championship U16 (boys) | C45 Scotch Game |
| 3. J Hartung vs C Persson |
| ½-½ | 42 | 1995 | World Championship U16 (boys) | C53 Giuoco Piano |
| 4. E Silva vs J Hartung |
| 1-0 | 39 | 1995 | World Championship U16 (boys) | D50 Queen's Gambit Declined |
| 5. J Hartung vs A Sanguinetti |
| ½-½ | 44 | 1995 | World Championship U16 (boys) | B43 Sicilian, Kan, 5.Nc3 |
| 6. R Bates vs J Hartung |
| 1-0 | 42 | 1995 | World Championship U16 (boys) | D36 Queen's Gambit Declined, Exchange, Positional line, 6.Qc2 |
| 7. J Hartung vs R Cvek |
| ½-½ | 47 | 1995 | World Championship U16 (boys) | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 8. J Hartung vs C Kerek |
| 0-1 | 26 | 1995 | World Championship U16 (boys) | B43 Sicilian, Kan, 5.Nc3 |
| 9. E Bastidas Rodriguez vs J Hartung |
| 0-1 | 31 | 1995 | World Championship U16 (boys) | A21 English |
| 10. J Hartung vs T Stolte Bezerra |
| ½-½ | 36 | 1995 | World Championship U16 (boys) | B12 Caro-Kann Defense |
| 11. I Sorkin vs J Hartung |
| ½-½ | 20 | 1995 | World Championship U16 (boys) | D54 Queen's Gambit Declined, Anti-Neo-Orthodox Variation |
| 12. J Hartung vs H Kallio |
| ½-½ | 58 | 1997 | European Youth Championship (Under-18) | B11 Caro-Kann, Two Knights, 3...Bg4 |
| 13. N Ribstein vs J Hartung |
| 1-0 | 27 | 1997 | European Youth Championship (Under-18) | C64 Ruy Lopez, Classical |
| 14. J Hartung vs H Grund |
| ½-½ | 51 | 1997 | European Youth Championship (Under-18) | B18 Caro-Kann, Classical |
| 15. M Sandhu vs J Hartung |
| ½-½ | 21 | 1997 | European Youth Championship (Under-18) | C64 Ruy Lopez, Classical |
| 16. J Hartung vs V Uvarov |
| 0-1 | 63 | 1997 | European Youth Championship (Under-18) | B31 Sicilian, Rossolimo Variation |
| 17. J Hartung vs N Guctekin |
| 0-1 | 29 | 1997 | European Youth Championship (Under-18) | C01 French, Exchange |
| 18. A Eusebe vs J Hartung |
| 1-0 | 46 | 1997 | European Youth Championship (Under-18) | A07 King's Indian Attack |
| 19. A Lehtinen vs J Hartung |
| 1-0 | 36 | 1997 | European Youth Championship (Under-18) | A54 Old Indian, Ukrainian Variation, 4.Nf3 |
| 20. J Hartung vs J Ribeiro |
| ½-½ | 9 | 1997 | European Youth Championship (Under-18) | C05 French, Tarrasch |
| 21. J Hartung vs H Bastian |
| ½-½ | 37 | 2002 | Oberliga Sued W 0102 | B29 Sicilian, Nimzovich-Rubinstein |
| 22. J Hartung vs I Mutschnik |
| 0-1 | 45 | 2003 | Stuttgart op | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 23. J Hartung vs S Pucher |
| ½-½ | 74 | 2005 | Belgian Team Championship 2005/06 | B92 Sicilian, Najdorf, Opocensky Variation |
| 24. J Hartung vs J Kaufeld |
| 0-1 | 36 | 2006 | Belgian Team Championship 2005/06 | B83 Sicilian |
| 25. Y Afek vs J Hartung |
| 1-0 | 23 | 2006 | Belgian Team Championship 2005/06 | C45 Scotch Game |
Kibitzing
