| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. S Zinser vs J C Letzelter |
 | ½-½ | 36 | 1968 | Monte Carlo | A14 English |
| 2. J C Letzelter vs Gheorghiu |
| 0-1 | 23 | 1968 | Monte Carlo | B09 Pirc, Austrian Attack |
| 3. Uhlmann vs J C Letzelter |
| 1-0 | 40 | 1968 | Monte Carlo | E90 King's Indian |
| 4. Portisch vs J C Letzelter |
| 0-1 | 42 | 1968 | Monte Carlo | D35 Queen's Gambit Declined |
| 5. J C Letzelter vs M Damjanovic |
| 0-1 | 26 | 1968 | Monte Carlo | B32 Sicilian |
| 6. Smyslov vs J C Letzelter |
| 1-0 | 28 | 1968 | Monte Carlo | A96 Dutch, Classical Variation |
| 7. J C Letzelter vs Robert E Byrne |
| 0-1 | 51 | 1968 | Monte Carlo | B09 Pirc, Austrian Attack |
| 8. N Padevsky vs J C Letzelter |
| 1-0 | 25 | 1968 | Monte Carlo | C45 Scotch Game |
| 9. J C Letzelter vs G Forintos |
| 0-1 | 26 | 1968 | Monte Carlo | B27 Sicilian |
| 10. Larsen vs J C Letzelter |
| 1-0 | 31 | 1968 | Monte Carlo | A14 English |
| 11. J C Letzelter vs Benko |
| 0-1 | 29 | 1968 | Monte Carlo | B09 Pirc, Austrian Attack |
| 12. Botvinnik vs J C Letzelter |
| 1-0 | 24 | 1968 | Monte Carlo | A07 King's Indian Attack |
| 13. J C Letzelter vs Hort |
| 0-1 | 25 | 1968 | Monte Carlo | B03 Alekhine's Defense |
| 14. J C Letzelter vs Myagmarsuren |
| 0-1 | 29 | 1968 | Chess Olympiad Qualifying Group 2 | B29 Sicilian, Nimzovich-Rubinstein |
| 15. W Hook vs J C Letzelter |
| 0-1 | 25 | 1968 | Chess Olympiad Final-D | D50 Queen's Gambit Declined |
| 16. H Kestler vs J C Letzelter |
| 0-1 | 39 | 1972 | Chess Olympiad Qualifying Group 4 | A97 Dutch, Ilyin-Genevsky |
| 17. J C Letzelter vs Matulovic |
| 0-1 | 33 | 1975 | Vratsa Zonal | B47 Sicilian, Taimanov (Bastrikov) Variation |
| 18. J C Letzelter vs Ermenkov |
| 0-1 | 33 | 1975 | Vratsa Zonal | B58 Sicilian |
| 19. M Czerniak vs J C Letzelter |
| 1-0 | 34 | 1975 | Vratsa Zonal | B04 Alekhine's Defense, Modern |
| 20. E Mortensen vs J C Letzelter |
| ½-½ | 42 | 1976 | Haifa Olympiad (Men) | D35 Queen's Gambit Declined |
| 21. D Taruffi vs J C Letzelter |
| 0-1 | 22 | 1976 | Haifa Olympiad (Men) | D50 Queen's Gambit Declined |
| 22. J C Letzelter vs M Dienavorian |
| 0-1 | 40 | 1976 | Haifa Olympiad (Men) | C15 French, Winawer |
| 23. J C Letzelter vs G Bonner |
| 1-0 | 47 | 1976 | Haifa Olympiad (Men) | C47 Four Knights |
| 24. O Ferreira vs J C Letzelter |
| 0-1 | 38 | 1976 | Haifa Olympiad (Men) | A95 Dutch, Stonewall |
| 25. J C Letzelter vs E Perez |
| ½-½ | 40 | 1976 | Haifa Olympiad (Men) | B83 Sicilian |
Kibitzing
