| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. M Pacheco vs J F Cubas |
| 1-0 | 22 | 2001 | Pan American-ch U20 | A88 Dutch, Leningrad, Main Variation with c6 |
| 2. M Pacheco vs K Vera |
| 0-1 | 51 | 2002 | Lima 1st | E97 King's Indian |
| 3. K Vera vs M Pacheco |
| 1-0 | 42 | 2002 | Lima 1st qual op | B21 Sicilian, 2.f4 and 2.d4 |
| 4. K Vera vs M Pacheco |
| ½-½ | 67 | 2002 | PER-ch serie A | A07 King's Indian Attack |
| 5. M Pacheco vs K Vera |
| 1-0 | 59 | 2002 | PER-ch | A88 Dutch, Leningrad, Main Variation with c6 |
| 6. M Pacheco vs D Volpinari |
| 1-0 | 23 | 2002 | Bled Olympiad | E94 King's Indian, Orthodox |
| 7. M Pacheco vs D Rowe |
| 1-0 | 59 | 2002 | Bled Olympiad | E10 Queen's Pawn Game |
| 8. G Timoscenko vs M Pacheco |
| 1-0 | 47 | 2002 | Bled Olympiad | E12 Queen's Indian |
| 9. M Pacheco vs M Illescas |
 | 0-1 | 65 | 2002 | Bled Olympiad | E00 Queen's Pawn Game |
| 10. C McNab vs M Pacheco |
| 1-0 | 60 | 2002 | Bled Olympiad | A29 English, Four Knights, Kingside Fianchetto |
| 11. M Pacheco vs C Barus |
| 0-1 | 49 | 2002 | Bled Olympiad | E15 Queen's Indian |
| 12. M Pacheco vs D Sermek |
| ½-½ | 57 | 2002 | Bled Olympiad | A59 Benko Gambit |
| 13. M Pacheco vs Z Izoria |
| 0-1 | 83 | 2003 | World Junior Championship | E94 King's Indian, Orthodox |
| 14. D Schneider vs M Pacheco |
| 1-0 | 87 | 2003 | World Junior Championship | C17 French, Winawer, Advance |
| 15. R Sadykov vs M Pacheco |
| 1-0 | 28 | 2003 | World Junior Championship | C18 French, Winawer |
| 16. M Kanep vs M Pacheco |
| 1-0 | 28 | 2003 | World Junior Championship | D12 Queen's Gambit Declined Slav |
| 17. M Pacheco vs R Khouseinov |
| 1-0 | 58 | 2004 | Calvia Olympiad | A53 Old Indian |
| 18. A Corke vs M Pacheco |
| 1-0 | 70 | 2004 | Calvia Olympiad | D13 Queen's Gambit Declined Slav, Exchange Variation |
| 19. J F Cubas vs M Pacheco |
| 1-0 | 55 | 2004 | Calvia Olympiad | B40 Sicilian |
| 20. E Campos vs M Pacheco |
| 1-0 | 35 | 2004 | Calvia Olympiad | B40 Sicilian |
| 21. M Pacheco vs N Zilberman |
| ½-½ | 38 | 2004 | Calvia Olympiad | E90 King's Indian |
| 22. M Pacheco vs C J Blanco Acevedo |
| 1-0 | 39 | 2004 | Calvia Olympiad | D13 Queen's Gambit Declined Slav, Exchange Variation |
| 23. M Bluvshtein vs M Pacheco |
| 1-0 | 49 | 2004 | Calvia Olympiad | D17 Queen's Gambit Declined Slav |
| 24. M Pacheco vs E Van Beers |
| ½-½ | 27 | 2004 | Calvia Olympiad | E15 Queen's Indian |
| 25. S Barrientos Chavarriaga vs M Pacheco |
| 1-0 | 78 | 2004 | Calvia Olympiad | C01 French, Exchange |
Kibitzing
