| 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 R Servat |
| ½-½ | 27 |
1988 |
Ch Argentina | C50 Giuoco Piano |
| 4. G Mahia vs S Pla |
| 1-0 | 41 |
1988 |
Mar del Plata op | C42 Petrov Defense |
| 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. A Zapata vs G Mahia |
| ½-½ | 19 |
2000 |
Najdorf mem Great fin | C64 Ruy Lopez, Classical |
| 9. G Mahia vs A Zapata |
| ½-½ | 33 |
2000 |
Najdorf mem Great fin | B26 Sicilian, Closed, 6.Be3 |
| 10. J Sanchez Almeyra vs G Mahia |
| 0-1 | 85 |
2000 |
Najdorf mem Great fin | C65 Ruy Lopez, Berlin Defense |
| 11. G Mahia vs J Sanchez Almeyra |
| ½-½ | 51 |
2000 |
Najdorf mem Great fin | B24 Sicilian, Closed |
| 12. G Mahia vs E Schiller |
| 0-1 | 53 |
2002 |
D02S15A | A40 Queen's Pawn Game |
| 13. G Mahia vs J Vera Infran |
| 1-0 | 48 |
2003 |
Torneo Continental Americano | B74 Sicilian, Dragon, Classical |
| 14. G Mahia vs R Huertas Soris |
| 1-0 | 58 |
2003 |
Torneo Continental Americano | C18 French, Winawer |
| 15. G Mahia vs A Aguilar |
| 0-1 | 39 |
2003 |
Torneo Continental Americano | B66 Sicilian, Richter-Rauzer Attack, 7...a6 |
| 16. A Ramirez vs G Mahia |
| 1-0 | 33 |
2003 |
Torneo Continental Americano | D53 Queen's Gambit Declined |
| 17. Gulko vs G Mahia |
| 1-0 | 64 |
2003 |
Torneo Continental Americano | A29 English, Four Knights, Kingside Fianchetto |
| 18. G Mahia vs H Ojeda |
| 1-0 | 40 |
2003 |
Torneo Continental Americano | B10 Caro-Kann |
| 19. G Mahia vs S Slipak |
| ½-½ | 25 |
2003 |
Torneo Continental Americano | B12 Caro-Kann Defense |
| 20. J Gonzalez Garcia vs G Mahia |
 | 1-0 | 57 |
2003 |
Torneo Continental Americano | B43 Sicilian, Kan, 5.Nc3 |
| 21. T Gelashvili vs G Mahia |
| 1-0 | 61 |
2004 |
Dos Hermanas | C00 French Defense |
| 22. Kasimdzhanov vs G Mahia |
| 1-0 | 34 |
2004 |
Dos Hermanas | C11 French |
| 23. Julian Sapienza vs G Mahia |
| 0-1 | 45 |
2008 |
Semi Arg Bs. As. | B40 Sicilian |
| 24. G Mahia vs F Salguero |
 | 1-0 | 50 |
2008 |
Argentine Championship | B45 Sicilian, Taimanov |
| 25. G Mahia vs S Alonso |
| ½-½ | 35 |
2008 |
Argentine Championship | D10 Queen's Gambit Declined Slav |