Game |
| Result | Moves |
Year | Event/Locale | Opening |
176. H Seidman vs L Evans |
| 0-1 | 41 | 1968 | United States Championship | B90 Sicilian, Najdorf |
177. T Weinberger vs H Seidman |
| 1-0 | 52 | 1968 | United States Championship | E65 King's Indian, Fianchetto, Yugoslav, 7.O-O |
178. R Byrne vs H Seidman |
| 1-0 | 21 | 1968 | United States Championship | C75 Ruy Lopez, Modern Steinitz Defense |
179. H Seidman vs A Saidy |
| 0-1 | 39 | 1968 | United States Championship | B25 Sicilian, Closed |
180. A Bisguier vs H Seidman |
| 1-0 | 39 | 1968 | United States Championship | C71 Ruy Lopez |
181. H Seidman vs Benko |
| 0-1 | 38 | 1968 | United States Championship | B80 Sicilian, Scheveningen |
182. I A Horowitz vs H Seidman |
| ½-½ | 52 | 1968 | United States Championship | C75 Ruy Lopez, Modern Steinitz Defense |
183. H Seidman vs Lombardy |
 | 1-0 | 39 | 1968 | United States Championship | B90 Sicilian, Najdorf |
184. H Seidman vs B Zuckerman |
 | 0-1 | 23 | 1968 | United States Championship | B32 Sicilian |
185. Reshevsky vs H Seidman |
 | 1-0 | 46 | 1968 | United States Championship | D92 Grunfeld, 5.Bf4 |
186. H Seidman vs A Bisguier |
| ½-½ | 42 | 1968 | Goldwater-Marshall Tournament | C78 Ruy Lopez |
187. H Seidman vs A Soltis |
| 0-1 | 45 | 1968 | Goldwater-Marshall Tournament | B11 Caro-Kann, Two Knights, 3...Bg4 |
188. J Sherwin vs H Seidman |
| 1-0 | 31 | 1968 | Goldwater-Marshall Tournament | B27 Sicilian |
189. H Seidman vs L Levy |
| 1-0 | 34 | 1968 | Goldwater-Marshall Tournament | B05 Alekhine's Defense, Modern |
190. E Mednis vs H Seidman |
| 1-0 | 27 | 1968 | Goldwater-Marshall Tournament | C75 Ruy Lopez, Modern Steinitz Defense |
191. A Soltis vs H Seidman |
| ½-½ | 29 | 1970 | Tournament of Marshall Champions | B02 Alekhine's Defense |
192. Timman vs H Seidman |
 | 0-1 | 51 | 1974 | 75th US Open | B01 Scandinavian |
193. H Seidman vs A Bisguier |
| ½-½ | 27 | 1974 | 75th US Open | C86 Ruy Lopez, Worrall Attack |
194. H Seidman vs S Bernstein |
| 1-0 | 46 | 1974 | 75th US Open | C86 Ruy Lopez, Worrall Attack |