| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 76. H Seidman vs W Shipman |
 | 1-0 | 40 | 1946 | 47th US Open | C86 Ruy Lopez, Worrall Attack |
| 77. H Seidman vs O Ulvestad |
| 1-0 | 73 | 1946 | 47th US Open | C41 Philidor Defense |
| 78. D Byrne vs H Seidman |
| ½-½ | 34 | 1946 | 47th US Open | D81 Grunfeld, Russian Variation |
| 79. H Seidman vs F Yerhoff |
| 1-0 | 26 | 1946 | 47th US Open | C78 Ruy Lopez |
| 80. Kupchik vs H Seidman |
| ½-½ | 33 | 1946 | 47th US Open | D96 Grunfeld, Russian Variation |
| 81. H Seidman vs M L Hanauer |
| 1-0 | 43 | 1951 | United States Championship | B14 Caro-Kann, Panov-Botvinnik Attack |
| 82. H Seidman vs I A Horowitz |
| 1-0 | 44 | 1951 | United States Championship | B74 Sicilian, Dragon, Classical |
| 83. A Simonson vs H Seidman |
| 0-1 | 59 | 1951 | United States Championship | A15 English |
| 84. H Seidman vs L Evans |
| 0-1 | 43 | 1951 | United States Championship | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 85. S Bernstein vs H Seidman |
| 1-0 | 64 | 1951 | United States Championship | D85 Grunfeld |
| 86. H Seidman vs A Pinkus |
| 1-0 | 34 | 1951 | United States Championship | C59 Two Knights |
| 87. M Pavey vs H Seidman |
| ½-½ | 47 | 1951 | United States Championship | A52 Budapest Gambit |
| 88. H Seidman vs A Mengarini |
| 1-0 | 26 | 1951 | United States Championship | C51 Evans Gambit |
| 89. Santasiere vs H Seidman |
| ½-½ | 28 | 1951 | United States Championship | A12 English with b3 |
| 90. H Seidman vs Shainswit |
| ½-½ | 23 | 1951 | United States Championship | C10 French |
| 91. Reshevsky vs H Seidman |
| 1-0 | 41 | 1951 | United States Championship | A52 Budapest Gambit |
| 92. H Seidman vs J Sherwin |
| 0-1 | 37 | 1954 | United States Championship | B56 Sicilian |
| 93. M Pavey vs H Seidman |
| 1-0 | 68 | 1954 | United States Championship | D72 Neo-Grunfeld, 5.cd, Main line |
| 94. H Seidman vs A Bisguier |
| ½-½ | 18 | 1954 | United States Championship | C80 Ruy Lopez, Open |
| 95. H Seidman vs S Wachs |
| 1-0 | 51 | 1954 | United States Championship | C01 French, Exchange |
| 96. S Bernstein vs H Seidman |
| 1-0 | 48 | 1954 | United States Championship | A48 King's Indian |
| 97. H Seidman vs P Brandts |
| ½-½ | 64 | 1954 | United States Championship | C86 Ruy Lopez, Worrall Attack |
| 98. H Berliner vs H Seidman |
| 0-1 | 27 | 1954 | United States Championship | D86 Grunfeld, Exchange |
| 99. H Seidman vs A Mengarini |
| 1-0 | 44 | 1954 | United States Championship | B10 Caro-Kann |
| 100. Rossolimo vs H Seidman |
| ½-½ | 55 | 1954 | United States Championship | D93 Grunfeld, with Bf4 & e3 |
Kibitzing
