| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. G Mahia vs Quinteros |
 | 1-0 | 28 |
1980 |
Buenos Aires (Argentina) | B97 Sicilian, Najdorf |
| 2. P Ricardi vs G Mahia |
| ½-½ | 45 |
1985 |
ARG-ch | E97 King's Indian |
| 3. G Mahia vs S Pla |
| 1-0 | 41 |
1988 |
Mar del Plata op | C42 Petrov Defense |
| 4. G Mahia vs R Servat |
| ½-½ | 27 |
1988 |
Ch Argentina | C50 Giuoco Piano |
| 5. J Rosito vs G Mahia |
| 1-0 | 60 |
1989 |
Buenos Aires BCA op Hiarcs 7.32 | B46 Sicilian, Taimanov Variation |
| 6. A Rodriguez vs G Mahia |
| 1-0 | 51 |
1991 |
Bs As KONEX op | B33 Sicilian |
| 7. G Mahia vs N Diaz |
| 1-0 | 53 |
1998 |
Trenque Lauquen Masters | C42 Petrov Defense |
| 8. J Sanchez Almeyra vs G Mahia |
| 0-1 | 85 |
2000 |
Najdorf mem Great fin | C65 Ruy Lopez, Berlin Defense |
| 9. G Mahia vs J Sanchez Almeyra |
| ½-½ | 51 |
2000 |
Najdorf mem Great fin | B24 Sicilian, Closed |
| 10. A Zapata vs G Mahia |
| ½-½ | 19 |
2000 |
Najdorf mem Great fin | C64 Ruy Lopez, Classical |
| 11. G Mahia vs A Zapata |
| ½-½ | 33 |
2000 |
Najdorf mem Great fin | B26 Sicilian, Closed, 6.Be3 |
| 12. G Mahia vs E Schiller |
| 0-1 | 53 |
2002 |
D02S15A | A40 Queen's Pawn Game |
| 13. A Ramirez vs G Mahia |
| 1-0 | 33 |
2003 |
Torneo Continental Americano | D53 Queen's Gambit Declined |
| 14. Gulko vs G Mahia |
| 1-0 | 64 |
2003 |
Torneo Continental Americano | A29 English, Four Knights, Kingside Fianchetto |
| 15. G Mahia vs H Ojeda |
| 1-0 | 40 |
2003 |
Torneo Continental Americano | B10 Caro-Kann |
| 16. R Gonzalez vs G Mahia |
| 1-0 | 41 |
2003 |
Internet Section 17-B | A07 King's Indian Attack |
| 17. G Mahia vs S Slipak |
| ½-½ | 25 |
2003 |
Torneo Continental Americano | B12 Caro-Kann Defense |
| 18. J Gonzalez Garcia vs G Mahia |
 | 1-0 | 57 |
2003 |
Torneo Continental Americano | B43 Sicilian, Kan, 5.Nc3 |
| 19. G Mahia vs J Vera Infran |
| 1-0 | 48 |
2003 |
Torneo Continental Americano | B74 Sicilian, Dragon, Classical |
| 20. G Mahia vs R Huertas Soris |
| 1-0 | 58 |
2003 |
Torneo Continental Americano | C18 French, Winawer |
| 21. G Mahia vs A Aguilar |
| 0-1 | 39 |
2003 |
Torneo Continental Americano | B66 Sicilian, Richter-Rauzer Attack, 7...a6 |
| 22. T Gelashvili vs G Mahia |
| 1-0 | 61 |
2004 |
Dos Hermanas | C00 French Defense |
| 23. Kasimdzhanov vs G Mahia |
| 1-0 | 34 |
2004 |
Dos Hermanas | C11 French |
| 24. D Valerga vs G Mahia |
| 1-0 | 66 |
2008 |
Argentine Championship | C67 Ruy Lopez |
| 25. G Mahia vs L Liascovich |
| ½-½ | 17 |
2008 |
Magistral Internacional Ruibal | C64 Ruy Lopez, Classical |