| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J L Hammer vs M Hoffmann |
| ½-½ | 23 |
2006 |
European Club Cup | E33 Nimzo-Indian, Classical |
| 2. J L Hammer vs A Wirig |
| 1-0 | 26 |
2010 |
European Club Cup | E55 Nimzo-Indian, 4.e3, Gligoric System, Bronstein Variation |
| 3. J L Hammer vs Judit Polgar |
| ½-½ | 45 |
2010 |
Arctic Securities Chess Stars | E53 Nimzo-Indian, 4.e3 |
| 4. J L Hammer vs A Zubarev |
| 1-0 | 40 |
2011 |
39th Greek Teams | E20 Nimzo-Indian |
| 5. J L Hammer vs Wang Hao |
| ½-½ | 27 |
2011 |
European Club Cup | E25 Nimzo-Indian, Samisch |
| 6. J L Hammer vs I Papaioannou |
| 0-1 | 28 |
2011 |
39th Greek Teams | E20 Nimzo-Indian |
| 7. J L Hammer vs R Hess |
 | 1-0 | 32 |
2011 |
Reykjavik Open | E56 Nimzo-Indian, 4.e3, Main line with 7...Nc6 |
| 8. J L Hammer vs R Hess |
 | 0-1 | 34 |
2011 |
Aeroflot Open | E20 Nimzo-Indian |
| 9. J L Hammer vs Rozentalis |
| 1-0 | 54 |
2011 |
Oslo Chess International | E53 Nimzo-Indian, 4.e3 |
| 10. J L Hammer vs Naiditsch |
| ½-½ | 51 |
2011 |
39th Greek Teams | E20 Nimzo-Indian |
| 11. J L Hammer vs S P Sethuraman |
 | ½-½ | 74 |
2011 |
Aeroflot Open | E53 Nimzo-Indian, 4.e3 |
| 12. J L Hammer vs S Gabrielsen |
| 1-0 | 30 |
2011 |
Oslo Chess International | E20 Nimzo-Indian |
| 13. J L Hammer vs L Picart |
| 1-0 | 18 |
2012 |
30th Andorra Open | E21 Nimzo-Indian, Three Knights |
| 14. J L Hammer vs Kaidanov |
| ½-½ | 86 |
2012 |
Philadelphia Open | E20 Nimzo-Indian |
| 15. J L Hammer vs T Hillarp Persson |
| 1-0 | 52 |
2012 |
TCh-NOR Eliteserien -13 | E21 Nimzo-Indian, Three Knights |
| 16. J L Hammer vs S Agdestein |
| 1-0 | 43 |
2012 |
ch-NOR | E21 Nimzo-Indian, Three Knights |
| 17. J L Hammer vs Kasimdzhanov |
| ½-½ | 34 |
2012 |
Bundesliga | E21 Nimzo-Indian, Three Knights |
| 18. J L Hammer vs Z Amanov |
| ½-½ | 24 |
2012 |
22nd North American Open | E21 Nimzo-Indian, Three Knights |
| 19. J L Hammer vs J Arizmendi Martinez |
| ½-½ | 48 |
2012 |
30th Andorra Open | E52 Nimzo-Indian, 4.e3, Main line with ...b6 |
| 20. J L Hammer vs D Zoler |
| 1-0 | 64 |
2012 |
30th Andorra Open | E21 Nimzo-Indian, Three Knights |