| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. Bisguier vs W G Addison |
| 0-1 | 44 |
1965 |
USA | D32 Queen's Gambit Declined, Tarrasch |
| 27. Suttles vs W G Addison |
 | 1-0 | 28 |
1965 |
USA-ch New York | C30 King's Gambit Declined |
| 28. W G Addison vs Fischer |
 | ½-½ | 59 |
1965 |
New York ch-US | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
| 29. R Calvo vs W G Addison |
| 0-1 | 45 |
1966 |
Havana ol (Men) | B56 Sicilian |
| 30. Matulovic vs W G Addison |
| 1-0 | 55 |
1966 |
La Habana ol (Men) fin-A | C79 Ruy Lopez, Steinitz Defense Deferred |
| 31. M Czerniak vs W G Addison |
| 1-0 | 42 |
1966 |
Havana ol (Men) | B58 Sicilian |
| 32. W G Addison vs J M Ribeiro |
| 1-0 | 39 |
1966 |
Havana ol (Men) | D55 Queen's Gambit Declined |
| 33. W G Addison vs J Kostro |
 | 1-0 | 19 |
1966 |
Havana ol (Men) | E46 Nimzo-Indian |
| 34. Fischer vs W G Addison |
 | ½-½ | 31 |
1966 |
New York ch-US | C80 Ruy Lopez, Open |
| 35. L Barczay vs W G Addison |
| 1-0 | 38 |
1966 |
Havana ol (Men) | C45 Scotch Game |
| 36. H Salazar vs W G Addison |
| 0-1 | 26 |
1966 |
Havana ol (Men) | A53 Old Indian |
| 37. G Sigurjonsson vs W G Addison |
| 0-1 | 39 |
1966 |
Havana ol (Men) | B56 Sicilian |
| 38. W G Addison vs R Hoen |
| 0-1 | 81 |
1966 |
Havana ol (Men) | A85 Dutch, with c4 & Nc3 |
| 39. Ivkov vs W G Addison |
| ½-½ | 34 |
1967 |
Maribor | C81 Ruy Lopez, Open, Howell Attack |
| 40. A Matanovic vs W G Addison |
| 1-0 | 51 |
1967 |
Maribor | C03 French, Tarrasch |
| 41. W G Addison vs Reshevsky |
| ½-½ | 42 |
1967 |
Maribor | E09 Catalan, Closed |
| 42. Udovcic vs W G Addison |
| ½-½ | 41 |
1967 |
Maribor | D16 Queen's Gambit Declined Slav |
| 43. W G Addison vs V Musil |
| ½-½ | 15 |
1967 |
Maribor | B44 Sicilian |
| 44. L Zinn vs W G Addison |
| 0-1 | 63 |
1967 |
Maribor | B21 Sicilian, 2.f4 and 2.d4 |
| 45. W G Addison vs Janosevic |
| 1-0 | 41 |
1967 |
Maribor | A56 Benoni Defense |
| 46. S Malesic vs W G Addison |
| ½-½ | 25 |
1967 |
Maribor | B30 Sicilian |
| 47. Minev vs W G Addison |
| ½-½ | 15 |
1967 |
Maribor | D12 Queen's Gambit Declined Slav |
| 48. W G Addison vs Pirc |
| 1-0 | 42 |
1967 |
Maribor | B08 Pirc, Classical |
| 49. Unzicker vs W G Addison |
| 1-0 | 48 |
1967 |
Maribor | C82 Ruy Lopez, Open |
| 50. L Crepinsek vs W G Addison |
| ½-½ | 76 |
1967 |
Maribor | A15 English |