| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. J Rosito vs G Mahia |
| 1-0 | 60 |
1989 |
Buenos Aires BCA op Hiarcs 7.32 | B46 Sicilian, Taimanov Variation |
| 2. A Rodriguez vs G Mahia |
| 1-0 | 51 |
1991 |
Bs As KONEX op | B33 Sicilian |
| 3. G Mahia vs E Schiller |
| 0-1 | 53 |
2002 |
D02S15A | A40 Queen's Pawn Game |
| 4. J Gonzalez Garcia vs G Mahia |
 | 1-0 | 57 |
2003 |
Torneo Continental Americano | B43 Sicilian, Kan, 5.Nc3 |
| 5. G Mahia vs A Aguilar |
| 0-1 | 39 |
2003 |
Torneo Continental Americano | B66 Sicilian, Richter-Rauzer Attack, 7...a6 |
| 6. Gulko vs G Mahia |
| 1-0 | 64 |
2003 |
Torneo Continental Americano | A29 English, Four Knights, Kingside Fianchetto |
| 7. A Ramirez vs G Mahia |
| 1-0 | 33 |
2003 |
Torneo Continental Americano | D53 Queen's Gambit Declined |
| 8. R Gonzalez vs G Mahia |
| 1-0 | 41 |
2003 |
Internet Section 17-B | A07 King's Indian Attack |
| 9. T Gelashvili vs G Mahia |
| 1-0 | 61 |
2004 |
Dos Hermanas | C00 French Defense |
| 10. Kasimdzhanov vs G Mahia |
| 1-0 | 34 |
2004 |
Dos Hermanas | C11 French |
| 11. P Ricardi vs G Mahia |
| 1-0 | 44 |
2008 |
Argentine Championship | E00 Queen's Pawn Game |
| 12. R Dos Santos vs G Mahia |
| 1-0 | 29 |
2008 |
Magistral Internacional Ruibal | C18 French, Winawer |
| 13. G Mahia vs R Felgaer |
| 0-1 | 34 |
2008 |
Argentine Championship | B43 Sicilian, Kan, 5.Nc3 |
| 14. C Garcia-Palermo vs G Mahia |
| 1-0 | 50 |
2008 |
Magistral Internacional Ruibal | E70 King's Indian |
| 15. D Valerga vs G Mahia |
| 1-0 | 66 |
2008 |
Argentine Championship | C67 Ruy Lopez |
| 16. A Rodriguez vs G Mahia |
| 1-0 | 28 |
2008 |
Magistral Internacional Ruibal | C02 French, Advance |
| 17. G Mahia vs D Lemos |
| 0-1 | 39 |
2008 |
Magistral Internacional Ruibal | A45 Queen's Pawn Game |
| 18. E Real de Azua vs G Mahia |
| 1-0 | 48 |
2008 |
Argentine Championship | C07 French, Tarrasch |
| 19. S Mareco vs G Mahia |
| 1-0 | 47 |
2008 |
Magistral Internacional Ruibal | E92 King's Indian |
| 20. D Flores vs G Mahia |
| 1-0 | 43 |
2008 |
Semi Arg Bs. As. | A28 English |
| 21. G Mahia vs D Valerga |
| 0-1 | 33 |
2008 |
Magistral Internacional Ruibal | A45 Queen's Pawn Game |
| 22. G Mahia vs A Diamant |
| 0-1 | 44 |
2009 |
Olympiad Mercosur | E71 King's Indian, Makagonov System (5.h3) |
