| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. Granda Zuniga vs M Sierra |
| 1-0 | 22 | 1994 | Lima ch-PER | D75 Neo-Grunfeld, 6.cd Nxd5, 7.O-O c5, 8.dxc5 |
| 2. M Sierra vs M Munoz Pantoja |
| 1-0 | 36 | 1995 | PER-ch43 | B32 Sicilian |
| 3. M Sierra vs A Cabrera |
| 1-0 | 29 | 2000 | Lima schev | B57 Sicilian |
| 4. M Sierra vs R Teixeira |
| 0-1 | 62 | 2003 | Sao Paulo Zonal | C01 French, Exchange |
| 5. O Zambrana vs M Sierra |
| 1-0 | 40 | 2003 | Sao Paulo Zonal | B87 Sicilian, Fischer-Sozin with ...a6 and ...b5 |
| 6. M Sierra vs D Lima |
| 0-1 | 45 | 2003 | Sao Paulo Zonal | C29 Vienna Gambit |
| 7. R Disconzi da Silva vs M Sierra |
| 0-1 | 42 | 2003 | Sao Paulo Zonal | A43 Old Benoni |
| 8. M Sierra vs Granda Zuniga |
| 0-1 | 42 | 2003 | Sao Paulo Zonal | C65 Ruy Lopez, Berlin Defense |
| 9. E Ramos vs M Sierra |
| 1-0 | 56 | 2003 | Sao Paulo Zonal | E54 Nimzo-Indian, 4.e3, Gligoric System |
| 10. M Sierra vs R Leitao |
| 0-1 | 47 | 2003 | Sao Paulo Zonal | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 11. Mecking vs M Sierra |
| ½-½ | 54 | 2003 | Sao Paulo Zonal | A43 Old Benoni |
| 12. M Sierra vs G Milos |
| 1-0 | 38 | 2003 | Sao Paulo Zonal | B30 Sicilian |
| 13. M Sierra vs J F Cubas |
| 0-1 | 32 | 2003 | Sao Paulo Itau Cup 7th | B57 Sicilian |
| 14. J Pelikian vs M Sierra |
| 0-1 | 64 | 2003 | Sao Paulo Itau Cup 7th | B00 Uncommon King's Pawn Opening |
| 15. M Sierra vs J Gomez Baillo |
| ½-½ | 30 | 2003 | Sao Paulo Itau Cup 7th | B13 Caro-Kann, Exchange |
| 16. P Garcia Toledo vs M Sierra |
| 1-0 | 25 | 2004 | Lima olympic qual | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 17. M Sierra vs P Garcia Toledo |
| 1-0 | 29 | 2004 | Lima olympic qual | A01 Nimzovich-Larsen Attack |
| 18. M Sierra vs C Quiroz |
| 1-0 | 29 | 2007 | Callao Open | B57 Sicilian |
| 19. M Sierra vs P Lafuente |
| ½-½ | 42 | 2007 | Callao Open | B13 Caro-Kann, Exchange |
| 20. B Roselli Mailhe vs M Sierra |
| 1-0 | 58 | 2007 | Callao Open | A43 Old Benoni |
| 21. D Abarca vs M Sierra |
| 0-1 | 31 | 2007 | Callao Open | B00 Uncommon King's Pawn Opening |
| 22. M Sierra vs R Felgaer |
| ½-½ | 24 | 2007 | Callao Open | B42 Sicilian, Kan |
| 23. Granda Zuniga vs M Sierra |
 | 1-0 | 55 | 2007 | Callao Open | A00 Uncommon Opening |
| 24. M Sierra vs J Contreras |
| ½-½ | 34 | 2007 | Callao Open | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 25. G Calcina vs M Sierra |
| 1-0 | 29 | 2007 | Callao Open | C01 French, Exchange |
Kibitzing
