| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. E Ditt vs D Rivera |
| 1-0 | 32 | 1965 | olm5 fin B4 corr6568 | C16 French, Winawer |
| 27. D Rivera vs O Moiseev |
| 0-1 | 20 | 1965 | olm5 fin B4 corr6568 | E92 King's Indian |
| 28. D Rivera vs J Hybl |
 | 0-1 | 38 | 1965 | olm5 fin B4 corr6568 | B65 Sicilian, Richter-Rauzer Attack, 7...Be7 Defense, 9...Nxd4 |
| 29. B Asman vs D Rivera |
| 1-0 | 41 | 1965 | olm5 fin B4 corr6568 | E69 King's Indian, Fianchetto, Classical Main line |
| 30. D Rivera vs Suttles |
 | 0-1 | 38 | 1965 | 66th US Open | A42 Modern Defense, Averbakh System |
| 31. D Rivera vs D Blohm |
| 1-0 | 35 | 1965 | 66th US Open | D51 Queen's Gambit Declined |
| 32. H Avram vs D Rivera |
| 0-1 | 49 | 1965 | 66th US Open | A78 Benoni, Classical with ...Re8 and ...Na6 |
| 33. D Rivera vs Lombardy |
| 0-1 | 35 | 1965 | 66th US Open | D30 Queen's Gambit Declined |
| 34. E Marchand vs D Rivera |
| 1-0 | 50 | 1965 | 66th US Open | E10 Queen's Pawn Game |
| 35. D Rivera vs E McCormick |
| 1-0 | 28 | 1965 | 66th US Open | B13 Caro-Kann, Exchange |
| 36. Gheorghiu vs D Rivera |
| 1-0 | 32 | 1966 | Orebro Stud olm prelim6 | A71 Benoni, Classical, 8.Bg5 |
| 37. P M Jamieson vs D Rivera |
| 0-1 | 72 | 1966 | Orebro Stud olm prelim6 | D43 Queen's Gambit Declined Semi-Slav |
| 38. D Rivera vs I Farago |
| 0-1 | 40 | 1966 | Orebro Stud olm prelim6 | C18 French, Winawer |
| 39. D Rivera vs S Bouaziz |
| 1-0 | 44 | 1966 | Orebro Stud olm fB | B84 Sicilian, Scheveningen |
| 40. H MacGrillen vs D Rivera |
| 1-0 | 43 | 1966 | Orebro Stud olm fB | A21 English |
| 41. D Rivera vs K B McAlpine |
| 0-1 | 58 | 1966 | Orebro Stud olm fB | B92 Sicilian, Najdorf, Opocensky Variation |
| 42. R Verstraeten vs D Rivera |
| ½-½ | 27 | 1966 | Orebro Stud olm fB | A45 Queen's Pawn Game |
| 43. D Rivera vs K Krantz |
| ½-½ | 41 | 1966 | Orebro Stud olm fB | C95 Ruy Lopez, Closed, Breyer |
| 44. B Kristjansson vs D Rivera |
| 1-0 | 40 | 1966 | Orebro Stud olm fB | B28 Sicilian, O'Kelly Variation |
| 45. D Rivera vs P Hohler |
| ½-½ | 16 | 1966 | Orebro Stud olm fB | E87 King's Indian, Samisch, Orthodox |
| 46. J Rodriguez Cordoba vs D Rivera |
| 1-0 | 40 | 1966 | Orebro Stud olm fB | A16 English |
| 47. J Kraehenbuehl vs D Rivera |
| 0-1 | 39 | 1986 | New York Open | A38 English, Symmetrical |
| 48. D Rivera vs Ivkov |
| ½-½ | 36 | 1993 | 3rd Principe de Asturias rapid | B32 Sicilian |
| 49. Suba vs D Rivera |
| 1-0 | 30 | 1993 | 3rd Principe de Asturias rapid | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 50. D Rivera vs F Garcia Jimenez |
| 1-0 | 38 | 2001 | Malaga Open | B01 Scandinavian |
Kibitzing
