Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. N Mannheimer vs D Bleijkmans |
 | 1-0 | 41 | 1898 | Cologne | A84 Dutch |
2. N Mannheimer vs Olland |
| ½-½ | 43 | 1899 | 27th DCA Congress, Amsterdam | D35 Queen's Gambit Declined |
3. W Schwan vs N Mannheimer |
| 0-1 | 38 | 1899 | 27th DCA Congress, Amsterdam | C62 Ruy Lopez, Old Steinitz Defense |
4. N Mannheimer vs C Trimborn |
 | 1-0 | 23 | 1899 | 27th DCA Congress, Amsterdam | C29 Vienna Gambit |
5. W Meiners vs N Mannheimer |
| 0-1 | 38 | 1899 | 27th DCA Congress, Amsterdam | C01 French, Exchange |
6. N Mannheimer vs A van Foreest |
| 1-0 | 35 | 1899 | 27th DCA Congress, Amsterdam | D35 Queen's Gambit Declined |
7. N Mannheimer vs J Moquette |
| 1-0 | 27 | 1899 | 27th DCA Congress, Amsterdam | D37 Queen's Gambit Declined |
8. F Pelzer vs N Mannheimer |
| 1-0 | 21 | 1899 | 27th DCA Congress, Amsterdam | C42 Petrov Defense |
9. J W te Kolste vs N Mannheimer |
| 0-1 | 34 | 1899 | 27th DCA Congress, Amsterdam | C01 French, Exchange |
10. N Mannheimer vs J Dimer |
 | 1-0 | 52 | 1899 | 27th DCA Congress, Amsterdam | C31 King's Gambit Declined, Falkbeer Counter Gambit |
11. D Bleijkmans vs N Mannheimer |
| 1-0 | 35 | 1899 | 27th DCA Congress, Amsterdam | B44 Sicilian |
12. N Mannheimer vs J D Tresling |
| ½-½ | 54 | 1899 | 27th DCA Congress, Amsterdam | D31 Queen's Gambit Declined |
13. H Atkins vs N Mannheimer |
| 1-0 | 28 | 1899 | 27th DCA Congress, Amsterdam | D55 Queen's Gambit Declined |
14. J Partaj vs N Mannheimer |
| 1-0 | 27 | 1899 | 27th DCA Congress, Amsterdam | C14 French, Classical |
15. N Mannheimer vs J F Heemskerk |
| 1-0 | 30 | 1899 | 27th DCA Congress, Amsterdam | C30 King's Gambit Declined |
16. N Mannheimer vs Swiderski |
| 1-0 | 48 | 1899 | 27th DCA Congress, Amsterdam | D35 Queen's Gambit Declined |
17. N Mannheimer vs Olland |
| 0-1 | 43 | 1900 | 12th DSB Congress Hauptturnier-A | D08 Queen's Gambit Declined, Albin Counter Gambit |
18. N Mannheimer vs W Meiners |
| 1-0 | 55 | 1901 | 29th DCA Congress, Haarlem | D02 Queen's Pawn Game |
19. B Leussen vs N Mannheimer |
| ½-½ | 45 | 1901 | 29th DCA Congress, Haarlem | C87 Ruy Lopez |
20. D Bleijkmans vs N Mannheimer |
 | 1-0 | 51 | 1901 | 29th DCA Congress, Haarlem | B45 Sicilian, Taimanov |
21. J Esser vs N Mannheimer |
| ½-½ | 57 | 1901 | 29th DCA Congress, Haarlem | C79 Ruy Lopez, Steinitz Defense Deferred |
22. Olland vs N Mannheimer |
| 1-0 | 43 | 1901 | 29th DCA Congress, Haarlem | C87 Ruy Lopez |
23. N Mannheimer vs A van Foreest |
 | ½-½ | 29 | 1901 | Haarlem | D30 Queen's Gambit Declined |
24. N Mannheimer vs H Weiss |
| 0-1 | 40 | 1904 | DSB-14.Kongress Hauptturnier C | B25 Sicilian, Closed |
25. Hering vs N Mannheimer |
| 0-1 | 27 | 1904 | DSB-14.Kongress Hauptturnier C | C26 Vienna |