| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J L Hammer vs Kasimdzhanov |
| 0-1 | 34 |
2004 |
Vlissingen HZ op | B40 Sicilian |
| 2. J L Hammer vs E Kengis |
| 0-1 | 32 |
2005 |
Open Norwegian Championship | B28 Sicilian, O'Kelly Variation |
| 3. J L Hammer vs A Hellmayr |
| 0-1 | 27 |
2005 |
21st European Club Cup | B43 Sicilian, Kan, 5.Nc3 |
| 4. J L Hammer vs B Einarsson |
| ½-½ | 45 |
2005 |
21st European Club Cup | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 5. J L Hammer vs T Pudas |
| 1-0 | 28 |
2005 |
BELFORT YWCC Boys Under 16 | B30 Sicilian |
| 6. J L Hammer vs A Shomoev |
| 0-1 | 42 |
2006 |
Chigorin mem-A 14th | B96 Sicilian, Najdorf |
| 7. J L Hammer vs M Ondozi |
| ½-½ | 60 |
2006 |
European Club Cup | B54 Sicilian |
| 8. J L Hammer vs T Gabrielsen |
| 0-1 | 35 |
2006 |
Norwegian Championship | B31 Sicilian, Rossolimo Variation |
| 9. J L Hammer vs E Forsaa |
| 1-0 | 47 |
2006 |
Midnight Sun Chess Challenge | B30 Sicilian |
| 10. J L Hammer vs E Gullaksen |
| 1-0 | 42 |
2006 |
Midnight Sun Chess Challenge | B31 Sicilian, Rossolimo Variation |
| 11. J L Hammer vs T Thorhallsson |
 | 1-0 | 109 |
2007 |
European Team Chess Championships | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 12. J L Hammer vs G Horvath |
| 1-0 | 34 |
2007 |
European Club Cup | B48 Sicilian, Taimanov Variation |
| 13. J L Hammer vs Macieja |
| 0-1 | 66 |
2007 |
Arctic Chess Challenge | B48 Sicilian, Taimanov Variation |
| 14. J L Hammer vs P Skovgaard |
| 1-0 | 37 |
2007 |
Politiken Cup | B96 Sicilian, Najdorf |
| 15. J L Hammer vs L Kritz |
| 0-1 | 66 |
2008 |
Gibraltar | B30 Sicilian |
| 16. J L Hammer vs R S Jones |
| 1-0 | 29 |
2008 |
Euro Club Cup | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 17. J L Hammer vs J Thomassen |
| ½-½ | 81 |
2008 |
Reykjavik Open | B30 Sicilian |
| 18. J L Hammer vs B Rzayev |
| 1-0 | 48 |
2008 |
World Junior Championship | B31 Sicilian, Rossolimo Variation |
| 19. J L Hammer vs S Bjornsson |
| 0-1 | 62 |
2008 |
Reykjavik Open | B42 Sicilian, Kan |
| 20. J L Hammer vs S Abu Sufian |
| 1-0 | 35 |
2008 |
2008 Olympiad | B27 Sicilian |
| 21. J L Hammer vs Kotronias |
| 1-0 | 47 |
2008 |
XXIV Open | B42 Sicilian, Kan |
| 22. J L Hammer vs M Pacher |
 | 1-0 | 27 |
2008 |
World Junior Championship | B40 Sicilian |
| 23. J L Hammer vs H Banikas |
| 0-1 | 57 |
2008 |
Gibraltar | B30 Sicilian |
| 24. J L Hammer vs N Huschenbeth |
| 1-0 | 35 |
2008 |
2008 Olympiad | B45 Sicilian, Taimanov |
| 25. J L Hammer vs K Akshayraj |
 | ½-½ | 33 |
2008 |
World Junior Championship | B31 Sicilian, Rossolimo Variation |