| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. M Fierro vs A Abishova |
| 1-0 | 51 | 1993 | Wch U16 Girls | B41 Sicilian, Kan |
| 2. M Fierro vs M Socko |
| 1-0 | 75 | 1993 | Wch U16 Girls | C01 French, Exchange |
| 3. Z Hagarova vs M Fierro |
| 0-1 | 63 | 1993 | Wch U16 Girls | B09 Pirc, Austrian Attack |
| 4. M Fierro vs T Bayarcec |
| 1-0 | 43 | 1993 | Wch U16 Girls | B13 Caro-Kann, Exchange |
| 5. S Storme vs M Fierro |
| 0-1 | 25 | 1993 | Wch U16 Girls | B00 Uncommon King's Pawn Opening |
| 6. M Fierro vs P Mohammad Karimi |
| 1-0 | 41 | 1994 | Wch U18 Girls | B80 Sicilian, Scheveningen |
| 7. A Wagener vs M Fierro |
| 0-1 | 76 | 1994 | Wch U18 Girls | A00 Uncommon Opening |
| 8. S Yordanova vs M Fierro |
| 0-1 | 43 | 1994 | Wch U18 Girls | A16 English |
| 9. M Fierro vs I Chervonenko |
| 1-0 | 58 | 1994 | Wch U20 Girls | C01 French, Exchange |
| 10. M Fierro vs M Sulistya |
 | 1-0 | 14 | 1994 | Wch U20 Girls | C28 Vienna Game |
| 11. T Depool Malave vs M Fierro |
| 0-1 | 18 | 1994 | Wch U20 Girls | B07 Pirc |
| 12. N Edzgveradze vs M Fierro |
| 1-0 | 32 | 1994 | Wch U20 Girls | A41 Queen's Pawn Game (with ...d6) |
| 13. M Fierro vs S Connolly |
| 1-0 | 28 | 1994 | Moscow Olympiad (Women) | C29 Vienna Gambit |
| 14. I Ostry vs M Fierro |
| 0-1 | 40 | 1994 | Moscow Olympiad (Women) | B06 Robatsch |
| 15. M Fierro vs Tseitlin |
| 0-1 | 49 | 1995 | Biel MTO op | B30 Sicilian |
| 16. T Shaked vs M Fierro |
| 1-0 | 38 | 1995 | New York Open | B01 Scandinavian |
| 17. M Fierro vs N Mariano |
| 0-1 | 35 | 1995 | New York Open | C00 French Defense |
| 18. M Fierro vs C Bijoux |
| 1-0 | 20 | 1995 | Wch U20 Girls | B14 Caro-Kann, Panov-Botvinnik Attack |
| 19. M Fierro vs L Smajlovic |
| 1-0 | 45 | 1995 | Wch U20 Girls | C10 French |
| 20. M Fierro vs A Gatine |
| 1-0 | 33 | 1995 | Wch U20 Girls | B76 Sicilian, Dragon, Yugoslav Attack |
| 21. M Fierro vs A Khegai |
| 1-0 | 22 | 1995 | Wch U20 Girls | B87 Sicilian, Fischer-Sozin with ...a6 and ...b5 |
| 22. S Cacho Reigadas vs M Fierro |
| 1-0 | 32 | 1996 | Vendrell op | A41 Queen's Pawn Game (with ...d6) |
| 23. M Fierro vs J Borrellas Comellas |
| 1-0 | 25 | 1996 | Vendrell op | C28 Vienna Game |
| 24. M Fierro vs M E Li Torres |
| 1-0 | 37 | 1996 | Capablanca Memorial-D | B28 Sicilian, O'Kelly Variation |
| 25. Sutovsky vs M Fierro |
| 1-0 | 25 | 1996 | Benasque | B31 Sicilian, Rossolimo Variation |
Kibitzing
