Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. R Prasca Sosa vs G Vescovi |
| 0-1 | 38 | 1998 | Pan American Youth Championship | B22 Sicilian, Alapin |
2. D Di Berardino vs R Prasca Sosa |
| 0-1 | 60 | 1999 | Rio de Janeiro tt U20 | C05 French, Tarrasch |
3. J E Ostos vs R Prasca Sosa |
| ½-½ | 31 | 1999 | VEN-ch | C01 French, Exchange |
4. J E Ostos vs R Prasca Sosa |
| 0-1 | 55 | 2000 | Valencia sub zt 2.3.5 | C04 French, Tarrasch, Guimard Main line |
5. R Prasca Sosa vs J E Ostos |
| 1-0 | 57 | 2000 | Valencia zt 2.3 | B08 Pirc, Classical |
6. G Carvalho vs R Prasca Sosa |
| ½-½ | 35 | 2000 | 6th Pan American Team Championship | A29 English, Four Knights, Kingside Fianchetto |
7. R Prasca Sosa vs W Arencibia Rodriguez |
| 0-1 | 30 | 2000 | 6th Pan American Team Championship | B06 Robatsch |
8. R Leitao vs R Prasca Sosa |
| 1-0 | 40 | 2000 | 6th Pan American Team Championship | C12 French, McCutcheon |
9. R Prasca Sosa vs J E Ostos |
| 0-1 | 36 | 2000 | VEN-ch Maxima | C05 French, Tarrasch |
10. R Prasca Sosa vs M Hoekstra |
| 1-0 | 40 | 2001 | PanAM-chJ U18 Absoluto | B22 Sicilian, Alapin |
11. J E Ostos vs R Prasca Sosa |
| 0-1 | 42 | 2001 | Merida Sub zt 2.3.5 | C05 French, Tarrasch |
12. R Prasca Sosa vs K Vera |
| 1-0 | 84 | 2002 | Casa Argentina 3rd | C42 Petrov Defense |
13. R Prasca Sosa vs P Acs |
| 0-1 | 69 | 2002 | Bled Olympiad | B40 Sicilian |
14. R Prasca Sosa vs I Miladinovic |
| ½-½ | 50 | 2002 | Bled Olympiad | B22 Sicilian, Alapin |
15. R Prasca Sosa vs T Hillarp Persson |
| 1-0 | 45 | 2002 | Bled Olympiad | A00 Uncommon Opening |
16. R Prasca Sosa vs J Shaw |
| ½-½ | 72 | 2002 | Bled Olympiad | B30 Sicilian |
17. J Gonzalez Garcia vs R Prasca Sosa |
| 0-1 | 41 | 2004 | Capablanca Memorial PREMIER I | D11 Queen's Gambit Declined Slav |
18. R Prasca Sosa vs D O Acosta |
| ½-½ | 45 | 2004 | Capablanca Memorial PREMIER I | C55 Two Knights Defense |
19. L Perez Rodriguez vs R Prasca Sosa |
| 0-1 | 53 | 2004 | Capablanca Memorial PREMIER I | D11 Queen's Gambit Declined Slav |
20. M Gongora vs R Prasca Sosa |
 | 0-1 | 78 | 2004 | Capablanca Memorial PREMIER I | C18 French, Winawer |
21. R Prasca Sosa vs R O Perez Garcia |
| ½-½ | 21 | 2004 | Capablanca Memorial PREMIER I | C10 French |
22. R Slobodjan vs R Prasca Sosa |
 | 1-0 | 33 | 2004 | Capablanca Memorial PREMIER I | D30 Queen's Gambit Declined |
23. R Prasca Sosa vs S Garcia Martinez |
| 0-1 | 63 | 2004 | Capablanca Memorial PREMIER I | C53 Giuoco Piano |
24. F M Gomez Fontal vs R Prasca Sosa |
| 1-0 | 49 | 2004 | Capablanca Memorial PREMIER I | D12 Queen's Gambit Declined Slav |
25. R Prasca Sosa vs P Lafuente |
| ½-½ | 35 | 2004 | Capablanca Memorial PREMIER I | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |