| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. G Mahia vs Quinteros |
 | 1-0 | 28 |
1980 |
Buenos Aires (Argentina) | B97 Sicilian, Najdorf |
| 2. G Mahia vs S Pla |
| 1-0 | 41 |
1988 |
Mar del Plata op | C42 Petrov Defense |
| 3. J Rosito vs G Mahia |
| 1-0 | 60 |
1989 |
Buenos Aires BCA op Hiarcs 7.32 | B46 Sicilian, Taimanov Variation |
| 4. A Rodriguez vs G Mahia |
| 1-0 | 51 |
1991 |
Bs As KONEX op | B33 Sicilian |
| 5. G Mahia vs N Diaz |
| 1-0 | 53 |
1998 |
Trenque Lauquen Masters | C42 Petrov Defense |
| 6. G Mahia vs R Huertas Soris |
| 1-0 | 58 |
2003 |
Torneo Continental Americano | C18 French, Winawer |
| 7. Gulko vs G Mahia |
| 1-0 | 64 |
2003 |
Torneo Continental Americano | A29 English, Four Knights, Kingside Fianchetto |
| 8. A Ramirez vs G Mahia |
| 1-0 | 33 |
2003 |
Torneo Continental Americano | D53 Queen's Gambit Declined |
| 9. R Gonzalez vs G Mahia |
| 1-0 | 41 |
2003 |
Internet Section 17-B | A07 King's Indian Attack |
| 10. G Mahia vs H Ojeda |
| 1-0 | 40 |
2003 |
Torneo Continental Americano | B10 Caro-Kann |
| 11. J Gonzalez Garcia vs G Mahia |
 | 1-0 | 57 |
2003 |
Torneo Continental Americano | B43 Sicilian, Kan, 5.Nc3 |
| 12. G Mahia vs J Vera Infran |
| 1-0 | 48 |
2003 |
Torneo Continental Americano | B74 Sicilian, Dragon, Classical |
| 13. T Gelashvili vs G Mahia |
| 1-0 | 61 |
2004 |
Dos Hermanas | C00 French Defense |
| 14. Kasimdzhanov vs G Mahia |
| 1-0 | 34 |
2004 |
Dos Hermanas | C11 French |
| 15. E Real de Azua vs G Mahia |
 | 1-0 | 48 |
2008 |
Argentine Championship | C07 French, Tarrasch |
| 16. G Mahia vs T Gibson |
| 1-0 | 55 |
2008 |
Semi Arg Bs. As. | D17 Queen's Gambit Declined Slav |
| 17. C Garcia-Palermo vs G Mahia |
| 1-0 | 50 |
2008 |
Magistral Internacional Ruibal | E70 King's Indian |
| 18. G Mahia vs F Salguero |
 | 1-0 | 50 |
2008 |
Argentine Championship | B45 Sicilian, Taimanov |
| 19. A Rodriguez vs G Mahia |
| 1-0 | 28 |
2008 |
Magistral Internacional Ruibal | C02 French, Advance |
| 20. G Mahia vs R Dos Santos |
| 1-0 | 66 |
2008 |
Semi Arg Bs. As. | D20 Queen's Gambit Accepted |
| 21. G Mahia vs Larsen |
 | 1-0 | 32 |
2008 |
Magistral Internacional Ruibal | A44 Old Benoni Defense |
| 22. P Ricardi vs G Mahia |
| 1-0 | 44 |
2008 |
Argentine Championship | E00 Queen's Pawn Game |
| 23. D Flores vs G Mahia |
| 1-0 | 43 |
2008 |
Semi Arg Bs. As. | A28 English |
| 24. S Mareco vs G Mahia |
| 1-0 | 47 |
2008 |
Magistral Internacional Ruibal | E92 King's Indian |
| 25. D Valerga vs G Mahia |
| 1-0 | 66 |
2008 |
Argentine Championship | C67 Ruy Lopez |