| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J L Hammer vs B Arvola |
| 1-0 | 35 |
2006 |
Midnight Sun Chess Challenge | C81 Ruy Lopez, Open, Howell Attack |
| 2. J L Hammer vs V Yandemirov |
| ½-½ | 28 |
2007 |
Cappelle la Grande | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 3. J L Hammer vs D Baramidze |
| ½-½ | 37 |
2008 |
Euro Club Cup | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 4. J L Hammer vs L Lenic |
| ½-½ | 46 |
2008 |
World Junior Championship | C78 Ruy Lopez |
| 5. J L Hammer vs M Narmontas |
| ½-½ | 29 |
2008 |
World Junior Championship | C78 Ruy Lopez |
| 6. J L Hammer vs E Moradiabadi |
 | 1-0 | 142 |
2008 |
Reykjavik Open | C89 Ruy Lopez, Marshall |
| 7. J L Hammer vs Eljanov |
 | 1-0 | 43 |
2009 |
17th European Team Championship | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 8. J L Hammer vs Fressinet |
| ½-½ | 30 |
2009 |
17th European Team Championship | C69 Ruy Lopez, Exchange, Gligoric Variation, 6.d4 |
| 9. J L Hammer vs S B Hansen |
 | 1-0 | 40 |
2009 |
Politiken Cup | C78 Ruy Lopez |
| 10. J L Hammer vs A Stefanova |
| ½-½ | 45 |
2009 |
Gibtelecom | C60 Ruy Lopez |