| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. J Bademian Orchanian vs R Grimaldi |
| ½-½ | 36 | 1977 | Pan American Championship | B94 Sicilian, Najdorf |
| 27. R Grimaldi vs W Hook |
| 1-0 | 15 | 1977 | Pan American Championship | C05 French, Tarrasch |
| 28. R Chavez Chavez vs R Grimaldi |
| 1-0 | 39 | 1977 | Pan American Championship | B78 Sicilian, Dragon, Yugoslav Attack, 10.castle long |
| 29. R Grimaldi vs Denker |
| 1-0 | 56 | 1977 | Pan American Championship | C05 French, Tarrasch |
| 30. G Garcia vs R Grimaldi |
| 0-1 | 58 | 1977 | Pan American Championship | B23 Sicilian, Closed |
| 31. R Grimaldi vs C Camaton Borbor |
| 1-0 | 44 | 1977 | Pan American Championship | B84 Sicilian, Scheveningen |
| 32. C Escondrillas vs R Grimaldi |
| 0-1 | 57 | 1977 | Pan American Championship | A04 Reti Opening |
| 33. R Grimaldi vs J Zarco Castillo |
| ½-½ | 25 | 1977 | Pan American Championship | B06 Robatsch |
| 34. H Perez Garcia vs R Grimaldi |
 | 1-0 | 26 | 1978 | San Salvador (El Salvador) | A67 Benoni, Taimanov Variation |
| 35. R Grimaldi vs J F Villarreal Felix |
| 1-0 | 80 | 1978 | World Youth U26 Team Championship qual-5 | C05 French, Tarrasch |
| 36. H Carvalho vs R Grimaldi |
| 1-0 | 44 | 1978 | World Youth U26 Team Championship qual-5 | B04 Alekhine's Defense, Modern |
| 37. A Rodriguez vs R Grimaldi |
| 1-0 | 40 | 1980 | World Youth U26 Team Championship qual-3 | B60 Sicilian, Richter-Rauzer |
| 38. R Grimaldi vs C Luque |
| ½-½ | 15 | 1980 | World Youth U26 Team Championship qual-3 | B18 Caro-Kann, Classical |
| 39. S Giardelli vs R Grimaldi |
| 1-0 | 39 | 1980 | World Youth U26 Team Championship qual-3 | A15 English |
| 40. R Grimaldi vs Dlugy |
| 0-1 | 42 | 1986 | Dubai Olympiad | A07 King's Indian Attack |
| 41. G Hernandez Guerrero vs R Grimaldi |
| 1-0 | 59 | 1986 | Dubai Olympiad | B18 Caro-Kann, Classical |
| 42. R Grimaldi vs A Ludgate |
| ½-½ | 24 | 1986 | Dubai Olympiad | A42 Modern Defense, Averbakh System |
| 43. Ftacnik vs R Grimaldi |
| 1-0 | 60 | 1988 | Thessaloniki Olympiad | A52 Budapest Gambit |
| 44. R Grimaldi vs Z Franco Ocampos |
| 0-1 | 31 | 1988 | Thessaloniki Olympiad | B59 Sicilian, Boleslavsky Variation, 7.Nb3 |
| 45. E Almada vs R Grimaldi |
| 1-0 | 20 | 1988 | Thessaloniki Olympiad | A46 Queen's Pawn Game |
| 46. R Grimaldi vs Lahendi Ndlhovu Vuto |
| 1-0 | 34 | 1990 | Novi Sad Olympiad | B07 Pirc |
| 47. R Cifuentes vs R Grimaldi |
| 1-0 | 57 | 1990 | Novi Sad Olympiad | A28 English |
| 48. J Abdulgaffar vs R Grimaldi |
| 0-1 | 51 | 1990 | Novi Sad Olympiad | B84 Sicilian, Scheveningen |
| 49. R Grimaldi vs M O Khan |
| ½-½ | 28 | 1990 | Novi Sad Olympiad | B90 Sicilian, Najdorf |
| 50. N E Khechen vs R Grimaldi |
| 1-0 | 27 | 1990 | Novi Sad Olympiad | D37 Queen's Gambit Declined |
Kibitzing
