| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. I Rivise vs H Gross |
| 1-0 | 27 | 1954 | 2nd Pan-American Chess Congress | C43 Petrov, Modern Attack |
| 27. A Bisguier vs I Rivise |
| 1-0 | 51 | 1954 | 2nd Pan-American Chess Congress | E76 King's Indian, Four Pawns Attack |
| 28. I Rivise vs S Van Gelder |
| 1-0 | 31 | 1955 | 56th US Open | B32 Sicilian |
| 29. I Zalys vs I Rivise |
| 0-1 | 46 | 1955 | 56th US Open | E67 King's Indian, Fianchetto |
| 30. W M Byland vs I Rivise |
| 0-1 | 41 | 1955 | 56th US Open | C34 King's Gambit Accepted |
| 31. I Rivise vs P Lapiken |
| ½-½ | 45 | 1955 | 56th US Open | C86 Ruy Lopez, Worrall Attack |
| 32. A Saidy vs I Rivise |
| 1-0 | 44 | 1955 | 56th US Open | E97 King's Indian |
| 33. I Rivise vs G Drexel |
| 1-0 | 45 | 1955 | 56th US Open | B62 Sicilian, Richter-Rauzer |
| 34. H Berliner vs I Rivise |
| ½-½ | 50 | 1955 | 56th US Open | E80 King's Indian, Samisch Variation |
| 35. I Rivise vs R Brieger |
| 1-0 | 48 | 1955 | 56th US Open | C02 French, Advance |
| 36. I Rivise vs J G Sullivan |
| 1-0 | 52 | 1955 | 56th US Open | C43 Petrov, Modern Attack |
| 37. Rossolimo vs I Rivise |
| 1-0 | 40 | 1955 | 56th US Open | E80 King's Indian, Samisch Variation |
| 38. Lombardy vs I Rivise |
 | 0-1 | 55 | 1955 | 56th US Open | E87 King's Indian, Samisch, Orthodox |
| 39. T Weinberger vs I Rivise |
| 1-0 | 45 | 1959 | So. California Championship | C95 Ruy Lopez, Closed, Breyer |
| 40. T Weinberger vs I Rivise |
| 1-0 | 38 | 1959 | Southern California Championship | C44 King's Pawn Game |
| 41. T Weinberger vs I Rivise |
| 0-1 | 34 | 1960 | California Ch | A42 Modern Defense, Averbakh System |
| 42. G R McMahon vs I Rivise |
| ½-½ | 41 | 1961 | 62nd US Open | E24 Nimzo-Indian, Samisch |
| 43. I Rivise vs L Isaacs |
| 1-0 | 57 | 1961 | 62nd US Open | C86 Ruy Lopez, Worrall Attack |
| 44. R W Walker vs I Rivise |
| 0-1 | 52 | 1961 | 62nd US Open | A21 English |
| 45. I Rivise vs L C Young |
| 1-0 | 31 | 1961 | 62nd US Open | C43 Petrov, Modern Attack |
| 46. I Rivise vs J E Barry |
| 1-0 | 37 | 1961 | 62nd US Open | C18 French, Winawer |
| 47. M Harrow vs I Rivise |
| ½-½ | 27 | 1961 | 62nd US Open | E46 Nimzo-Indian |
| 48. I Rivise vs A Bisguier |
| ½-½ | 66 | 1961 | 62nd US Open | C86 Ruy Lopez, Worrall Attack |
| 49. Z Kovacs vs I Rivise |
| ½-½ | 29 | 1961 | 62nd US Open | E51 Nimzo-Indian, 4.e3 |
| 50. I Rivise vs Benko |
 | 0-1 | 16 | 1961 | 62nd US Open | B32 Sicilian |
Kibitzing
