| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. E Osbun vs J E Warren |
| 1-0 | 45 | 1959 | 60th US Open | E30 Nimzo-Indian, Leningrad |
| 2. E Osbun vs J Sherwin |
 | 0-1 | 40 | 1959 | 60th US Open | E80 King's Indian, Samisch Variation |
| 3. J F Donovan vs E Osbun |
| 1-0 | 18 | 1959 | 60th US Open | A90 Dutch |
| 4. E Osbun vs W Carr |
| 0-1 | 40 | 1959 | 60th US Open | C18 French, Winawer |
| 5. E Osbun vs D Benge |
| 1-0 | 23 | 1961 | California Open | D45 Queen's Gambit Declined Semi-Slav |
| 6. O Celle vs E Osbun |
| 1-0 | 58 | 1961 | 62nd US Open | E90 King's Indian |
| 7. J A Nowak vs E Osbun |
| 0-1 | 42 | 1961 | 62nd US Open | D23 Queen's Gambit Accepted |
| 8. E Osbun vs W Addison |
| ½-½ | 40 | 1961 | 62nd US Open | B63 Sicilian, Richter-Rauzer Attack |
| 9. A W Bourke vs E Osbun |
| 0-1 | 38 | 1961 | 62nd US Open | C73 Ruy Lopez, Modern Steinitz Defense |
| 10. E Osbun vs C Henin |
| 1-0 | 41 | 1961 | 62nd US Open | A49 King's Indian, Fianchetto without c4 |
| 11. R Byrne vs E Osbun |
| 1-0 | 29 | 1961 | 62nd US Open | E62 King's Indian, Fianchetto |
| 12. E Osbun vs P Binns |
| 0-1 | 39 | 1961 | 62nd US Open | B07 Pirc |
| 13. N Weaver vs E Osbun |
| 0-1 | 16 | 1961 | 62nd US Open | E70 King's Indian |
| 14. E Osbun vs S Sloan |
| 0-1 | 48 | 1964 | Chess Friends of NorCal Open Championship | B01 Scandinavian |
| 15. Fischer vs E Osbun |
| 1-0 | 45 | 1964 | Clock simul, 10b | C52 Evans Gambit |
| 16. Browne vs E Osbun |
| 1-0 | 23 | 1970 | 6th American Open | B96 Sicilian, Najdorf |
| 17. E Osbun vs P Biyiasas |
| 0-1 | 31 | 1980 | Paul Masson Masters | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
| 18. M Ivanka vs E Osbun |
| 0-1 | 59 | 1980 | Paul Masson Masters | E63 King's Indian, Fianchetto, Panno Variation |
| 19. W Schill vs E Osbun |
| ½-½ | 66 | 1980 | Paul Masson Masters | C75 Ruy Lopez, Modern Steinitz Defense |
| 20. E Osbun vs R Lobo |
| 1-0 | 45 | 1980 | Paul Masson Masters | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
| 21. D C Taylor vs E Osbun |
| ½-½ | 27 | 1987 | USA-ch07 corr8790 | C44 King's Pawn Game |
| 22. E Osbun vs J L Vehre |
| ½-½ | 36 | 1988 | cr 5ch USA | B33 Sicilian |
| 23. E Osbun vs Adams |
| ½-½ | 35 | 1988 | cr 4ch USA | C29 Vienna Gambit |
| 24. E Osbun vs M Brooks |
| 0-1 | 39 | 1989 | American Open | C94 Ruy Lopez, Closed, Breyer Defense |
| 25. E Osbun vs E Tate |
| 0-1 | 47 | 1989 | American Open | A58 Benko Gambit |
Kibitzing
