| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. H Hernandez Carmenates vs R Prasca Sosa |
 | ½-½ | 60 | 2004 | Capablanca Memorial PREMIER I | D48 Queen's Gambit Declined Semi-Slav, Meran |
| 27. R Prasca Sosa vs R Vera |
| ½-½ | 61 | 2004 | Capablanca Memorial PREMIER I | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 28. J M Lopez Martinez vs R Prasca Sosa |
| ½-½ | 47 | 2004 | Capablanca Memorial PREMIER I | C18 French, Winawer |
| 29. F Peralta vs R Prasca Sosa |
| 1-0 | 33 | 2004 | Binissalem op 17th | D47 Queen's Gambit Declined Semi-Slav |
| 30. K Miton vs R Prasca Sosa |
| ½-½ | 30 | 2004 | Calvia Olympiad | D12 Queen's Gambit Declined Slav |
| 31. R Prasca Sosa vs J Isaev |
| 1-0 | 43 | 2004 | Calvia Olympiad | C55 Two Knights Defense |
| 32. A Abdulwahhab vs R Prasca Sosa |
| 0-1 | 52 | 2004 | Calvia Olympiad | C18 French, Winawer |
| 33. R Prasca Sosa vs D Mieles Palau |
| 1-0 | 60 | 2004 | Calvia Olympiad | B22 Sicilian, Alapin |
| 34. R Prasca Sosa vs F Berkes |
| ½-½ | 56 | 2004 | Calvia Olympiad | B08 Pirc, Classical |
| 35. M Tissir vs R Prasca Sosa |
| ½-½ | 62 | 2004 | Calvia Olympiad | C00 French Defense |
| 36. R Prasca Sosa vs F Cruz |
| 0-1 | 44 | 2004 | Calvia Olympiad | C53 Giuoco Piano |
| 37. C Kayle vs R Prasca Sosa |
| 0-1 | 45 | 2004 | Calvia Olympiad | D10 Queen's Gambit Declined Slav |
| 38. R Prasca Sosa vs M Pukkila |
| 1-0 | 66 | 2004 | Calvia Olympiad | B22 Sicilian, Alapin |
| 39. R Prasca Sosa vs M Bakalarz |
| 0-1 | 40 | 2004 | Calvia Olympiad | B40 Sicilian |
| 40. V Ilinsky vs R Prasca Sosa |
| ½-½ | 33 | 2004 | Calvia Olympiad | A06 Reti Opening |
| 41. R Prasca Sosa vs A Kveinys |
| ½-½ | 38 | 2004 | Calvia Olympiad | B03 Alekhine's Defense |
| 42. H Hernandez Carmenates vs R Prasca Sosa |
| 1-0 | 51 | 2004 | XVII Torre Memorial | C11 French |
| 43. R Prasca Sosa vs A Abreu Delgado |
| ½-½ | 9 | 2004 | XVII Torre Memorial | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 44. J C Gonzalez Zamora vs R Prasca Sosa |
| ½-½ | 44 | 2004 | XVII Torre Memorial | D43 Queen's Gambit Declined Semi-Slav |
| 45. A Giaccio vs R Prasca Sosa |
| ½-½ | 23 | 2005 | Capablanca mem Premier II 40th | C12 French, McCutcheon |
| 46. Y Quesada Perez vs R Prasca Sosa |
| 1-0 | 37 | 2005 | 40th Capablanca Memorial | C11 French |
| 47. R Prasca Sosa vs F Corrales Jimenez |
| 0-1 | 41 | 2005 | 40th Capablanca Memorial | B33 Sicilian |
| 48. K Asrian vs R Prasca Sosa |
| 0-1 | 35 | 2006 | Turin Olympiad | C03 French, Tarrasch |
| 49. R Prasca Sosa vs T Sorensen |
| 0-1 | 36 | 2006 | Turin Olympiad | B32 Sicilian |
| 50. A Pedro vs R Prasca Sosa |
| ½-½ | 53 | 2006 | Turin Olympiad | C00 French Defense |
Kibitzing
