| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. I Krush vs M Fierro |
| 0-1 | 36 | 1996 | New York Open | E92 King's Indian |
| 27. W Sheikhuder vs M Fierro |
| 0-1 | 38 | 1996 | Yerevan Olympiad (Women) | B32 Sicilian |
| 28. Y Hernandez Guerrero vs M Fierro |
| 0-1 | 35 | 1996 | Yerevan Olympiad (Women) | B31 Sicilian, Rossolimo Variation |
| 29. A Vargas vs M Fierro |
| 0-1 | 17 | 1996 | Wch U20 Girls | B00 Uncommon King's Pawn Opening |
| 30. M Fierro vs S Vajda |
 | 0-1 | 46 | 1996 | Wch U20 Girls | C29 Vienna Gambit |
| 31. M Fierro vs E Sevillano |
| 0-1 | 36 | 1997 | New York Open | B30 Sicilian |
| 32. N Gamboa vs M Fierro |
| ½-½ | 13 | 1997 | Quito Copa Saeta 1st | A38 English, Symmetrical |
| 33. M Fierro vs B Lugo |
| ½-½ | 6 | 1997 | Quito Copa Saeta 1st | B00 Uncommon King's Pawn Opening |
| 34. M Fierro vs J Becerra Rivero |
| 0-1 | 47 | 1997 | Linares Anibal Open | B15 Caro-Kann |
| 35. M Fierro vs M Pavlovic |
| ½-½ | 32 | 1997 | Linares Anibal Open | B31 Sicilian, Rossolimo Variation |
| 36. M Fierro vs Psakhis |
| 0-1 | 28 | 1998 | Benasque op | B90 Sicilian, Najdorf |
| 37. M Fierro vs A P Santos |
| 1-0 | 42 | 1998 | Faro op | C00 French Defense |
| 38. M Fierro vs R Zelcic |
| 0-1 | 42 | 1998 | Elista Olympiad | B01 Scandinavian |
| 39. M Fierro vs F Amonatov |
| 0-1 | 59 | 1998 | Elista Olympiad | B90 Sicilian, Najdorf |
| 40. M Fierro vs M Heidenfeld |
| 0-1 | 69 | 1998 | Elista Olympiad | C77 Ruy Lopez |
| 41. M Fierro vs H Al-Tamimi |
| 1-0 | 43 | 1998 | Elista Olympiad | C25 Vienna |
| 42. M Fierro vs D J James |
| 1-0 | 33 | 1998 | Elista Olympiad | B90 Sicilian, Najdorf |
| 43. G Hernandez Guerrero vs M Fierro |
| 1-0 | 24 | 1998 | San Salvador zt | B01 Scandinavian |
| 44. M Fierro vs Kazhgaleyev |
| 0-1 | 52 | 1999 | Anibal Open | C65 Ruy Lopez, Berlin Defense |
| 45. I Ostry vs M Fierro |
| ½-½ | 40 | 2000 | Istanbul Olympiad (Women) | A04 Reti Opening |
| 46. T Thorhallsson vs M Fierro |
| 1-0 | 34 | 2001 | Elbow Beach Club GM-B | B02 Alekhine's Defense |
| 47. M Fierro vs D Tyomkin |
| 1-0 | 51 | 2001 | Elbow Beach Club GM-B | A48 King's Indian |
| 48. F Doettling vs M Fierro |
| ½-½ | 20 | 2001 | Elbow Beach Club GM-B | A40 Queen's Pawn Game |
| 49. Timman vs M Fierro |
| 1-0 | 25 | 2001 | Curacao | B01 Scandinavian |
| 50. M Fierro vs C Gallegos Diaz |
| 0-1 | 48 | 2001 | Curacao | B31 Sicilian, Rossolimo Variation |
Kibitzing
