| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. M Fierro vs M Socko |
| 1-0 | 75 | 1993 | Wch U16 Girls | C01 French, Exchange |
| 2. M Fierro vs B Tuvshintugs |
| 1-0 | 43 | 1993 | Wch U16 Girls | B13 Caro-Kann, Exchange |
| 3. M Fierro vs A Abishova |
| 1-0 | 51 | 1993 | Wch U16 Girls | B41 Sicilian, Kan |
| 4. Z Stockova vs M Fierro |
| 0-1 | 63 | 1993 | Wch U16 Girls | B09 Pirc, Austrian Attack |
| 5. S Storme vs M Fierro |
| 0-1 | 25 | 1993 | Wch U16 Girls | B00 Uncommon King's Pawn Opening |
| 6. S Yordanova vs M Fierro |
| 0-1 | 43 | 1994 | Wch U18 Girls | A16 English |
| 7. Anna Wagener vs M Fierro |
| 0-1 | 76 | 1994 | Wch U18 Girls | A00 Uncommon Opening |
| 8. M Fierro vs P Mohammad Karimi |
| 1-0 | 41 | 1994 | Wch U18 Girls | B80 Sicilian, Scheveningen |
| 9. M Fierro vs S Connolly |
| 1-0 | 28 | 1994 | Olympiad (Womans) | C29 Vienna Gambit |
| 10. M Fierro vs L Maria |
 | 1-0 | 14 | 1994 | Wch U20 Girls | C28 Vienna Game |
| 11. M Fierro vs I Chervonenko |
| 1-0 | 58 | 1994 | Wch U20 Girls | C01 French, Exchange |
| 12. N Edzgveradze vs M Fierro |
| 1-0 | 32 | 1994 | Wch U20 Girls | A41 Queen's Pawn Game (with ...d6) |
| 13. T Depool Malave vs M Fierro |
| 0-1 | 18 | 1994 | Wch U20 Girls | B07 Pirc |
| 14. M Fierro vs C Bijoux |
| 1-0 | 20 | 1995 | Wch U20 Girls | B14 Caro-Kann, Panov-Botvinnik Attack |
| 15. M Fierro vs L Smajlovic |
| 1-0 | 45 | 1995 | Wch U20 Girls | C10 French |
| 16. M Fierro vs A Khegai |
| 1-0 | 22 | 1995 | Wch U20 Girls | B87 Sicilian, Fischer-Sozin with ...a6 and ...b5 |
| 17. M Fierro vs A Gatine |
| 1-0 | 33 | 1995 | Wch U20 Girls | B76 Sicilian, Dragon, Yugoslav Attack |
| 18. Sutovsky vs M Fierro |
| 1-0 | 25 | 1996 | Benasque | B31 Sicilian, Rossolimo Variation |
| 19. M Fierro vs J Borrellas Comellas |
| 1-0 | 25 | 1996 | Vendrell op | C28 Vienna Game |
| 20. I Krush vs M Fierro |
| 0-1 | 36 | 1996 | New York Open | E92 King's Indian |
| 21. W Sheikhuder vs M Fierro |
| 0-1 | 38 | 1996 | Olympiad (Women) | B32 Sicilian |
| 22. Y Hernandez vs M Fierro |
| 0-1 | 35 | 1996 | Olympiad (Women) | B31 Sicilian, Rossolimo Variation |
| 23. A Vargas vs M Fierro |
| 0-1 | 17 | 1996 | Wch U20 Girls | B00 Uncommon King's Pawn Opening |
| 24. M Fierro vs S Vajda |
| 0-1 | 46 | 1996 | Wch U20 Girls | C29 Vienna Gambit |
| 25. M Fierro vs A P Santos |
| 1-0 | 42 | 1998 | Faro op | C00 French Defense |
Kibitzing
