| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. W Schoenmann vs J A Seitz |
| 1-0 | 38 |
1920 |
Berlin2 | C01 French, Exchange |
| 2. M Bluemich vs J A Seitz |
| 1-0 | 24 |
1920 |
Berlin2 | C11 French |
| 3. R P Michell vs J A Seitz |
| 1-0 | 34 |
1922 |
Major Open | C12 French, McCutcheon |
| 4. J A Seitz vs J Blake |
| 0-1 | 38 |
1922 |
Major Open | E00 Queen's Pawn Game |
| 5. Euwe vs J A Seitz |
| 1-0 | 34 |
1923 |
Hastings2324 ;HCL 24 | D52 Queen's Gambit Declined |
| 6. Yates vs J A Seitz |
| 1-0 | 49 |
1923 |
Hastings 2324 | B41 Sicilian, Kan |
| 7. J A Seitz vs G Norman |
 | 0-1 | 28 |
1923 |
Hastings 2324 | A16 English |
| 8. J A Seitz vs Colle |
| 1-0 | 51 |
1923 |
Hastings 2324 | B41 Sicilian, Kan |
| 9. Maroczy vs J A Seitz |
| 1-0 | 54 |
1923 |
Hastings 2324 | C02 French, Advance |
| 10. E Voellmy vs J A Seitz |
| ½-½ | 36 |
1923 |
SUI-South Germany | D52 Queen's Gambit Declined |
| 11. J A Seitz vs R P Michell |
| 1-0 | 54 |
1923 |
Hastings 2324 | D64 Queen's Gambit Declined, Orthodox, Rubinstein Attack |
| 12. J A Seitz vs H E Price |
| 1-0 | 31 |
1923 |
Hastings 2324 | A10 English |
| 13. J A Seitz vs Alekhine |
 | 0-1 | 45 |
1923 |
Portsmouth-Southsea (03) | D51 Queen's Gambit Declined |
| 14. J A Seitz vs E Voellmy |
| ½-½ | 21 |
1923 |
SUI-South Germany | D63 Queen's Gambit Declined, Orthodox Defense |
| 15. J A Seitz vs J Blake |
| 1-0 | 70 |
1923 |
Hastings 2324 | A16 English |
| 16. J A Seitz vs Tarrasch |
| ½-½ | 51 |
1923 |
Trieste | A91 Dutch Defense |
| 17. Mieses vs J A Seitz |
| 0-1 | 48 |
1923 |
Hastings 2324 | B23 Sicilian, Closed |
| 18. J A Seitz vs H E Price |
| 1-0 | 36 |
1924 |
Hastings-A 2425 | D64 Queen's Gambit Declined, Orthodox, Rubinstein Attack |
| 19. J A Seitz vs Przepiorka |
| 0-1 | 53 |
1924 |
Gyor | A22 English |
| 20. L Dewing vs J A Seitz |
| 0-1 | 34 |
1924 |
Hastings-A 2425 | B41 Sicilian, Kan |
| 21. J A Seitz vs Maroczy |
| ½-½ | 22 |
1924 |
Hastings-A 2425 | C01 French, Exchange |
| 22. J A Seitz vs P D Bolland |
| ½-½ | 66 |
1924 |
Hastings-A 2425 | D64 Queen's Gambit Declined, Orthodox, Rubinstein Attack |
| 23. Yates vs J A Seitz |
| 1-0 | 48 |
1924 |
Hastings-A 2425 | B43 Sicilian, Kan, 5.Nc3 |
| 24. R P Michell vs J A Seitz |
| ½-½ | 51 |
1924 |
Hastings-A 2425 | B40 Sicilian |
| 25. V Vukovic vs J A Seitz |
| 1-0 | 49 |
1924 |
Gyor | D06 Queen's Gambit Declined |