| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Seidman vs Fine |
| 0-1 | 37 |
1939 |
North American champ | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 2. Seidman vs Santasiere |
 | 1-0 | 24 |
1939 |
New York | B29 Sicilian, Nimzovich-Rubinstein |
| 3. Seidman vs Reshevsky |
| 0-1 | 32 |
1939 |
New York ch-ACF | A03 Bird's Opening |
| 4. S Bernstein vs Seidman |
| ½-½ | 44 |
1939 |
Marshall CC Championship | D30 Queen's Gambit Declined |
| 5. Fine vs Seidman |
| 1-0 | 37 |
1940 |
New York USA ch, USA | E17 Queen's Indian |
| 6. Kashdan vs Seidman |
| 1-0 | 24 |
1940 |
USA Ch | D78 Neo-Grunfeld, 6.O-O c6 |
| 7. Reshevsky vs Seidman |
| ½-½ | 65 |
1940 |
USA-ch | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 8. Seidman vs S Bernstein |
| 0-1 | 32 |
1940 |
Ventnor City | B58 Sicilian |
| 9. Santasiere vs Seidman |
 | 1-0 | 39 |
1941 |
Hamilton New York | A04 Reti Opening |
| 10. Seidman vs Reshevsky |
 | 0-1 | 37 |
1942 |
USA-ch | C86 Ruy Lopez, Worrall Attack |
| 11. Chernev vs Seidman |
| 0-1 | 50 |
1942 |
USA-ch | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 12. Seidman vs Kashdan |
| 0-1 | 55 |
1942 |
New York, NY USA | C80 Ruy Lopez, Open |
| 13. Ragozin vs Seidman |
| 1-0 | 49 |
1945 |
USA-USSR Radio-match | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
| 14. Seidman vs W Cruz |
| ½-½ | 41 |
1945 |
Hollywood | C52 Evans Gambit |
| 15. Seidman vs I A Horowitz |
| 0-1 | 43 |
1945 |
Hollywood (USA) | C59 Two Knights |
| 16. Seidman vs Fine |
| 0-1 | 51 |
1945 |
It, Hollywood (USA) | B04 Alekhine's Defense, Modern |
| 17. Seidman vs Santasiere |
| 1-0 | 45 |
1946 |
Ch New York MARSHALL Cl | E46 Nimzo-Indian |
| 18. Seidman vs G Kramer |
 | 1-0 | 27 |
1946 |
US Open prelim | C80 Ruy Lopez, Open |
| 19. D Byrne vs Seidman |
| ½-½ | 34 |
1946 |
US Open Championship Final | D81 Grunfeld, Russian Variation |
| 20. Seidman vs G Katz |
| 1-0 | 49 |
1946 |
US Open Championship Final | C86 Ruy Lopez, Worrall Attack |
| 21. Santasiere vs Seidman |
| 1-0 | 45 |
1946 |
Ch New York MARSHALL Cl | A22 English |
| 22. D Byrne vs Seidman |
| 1-0 | 47 |
1946 |
US Open prelim | E14 Queen's Indian |
| 23. Seidman vs W Shipman |
 | 1-0 | 40 |
1946 |
US Open Championship Final | C86 Ruy Lopez, Worrall Attack |
| 24. O Shapiro vs Seidman |
| 0-1 | 35 |
1946 |
US Open prelim | D93 Grunfeld, with Bf4 & e3 |
| 25. Seidman vs Santasiere |
| 1-0 | 74 |
1946 |
Ch New York MARSHALL Cl | E33 Nimzo-Indian, Classical |