| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. M Pacheco vs C Barus |
| 0-1 | 49 |
2002 |
Bled Olympiad | E15 Queen's Indian |
| 2. C McNab vs M Pacheco |
| 1-0 | 60 |
2002 |
Bled Olympiad | A29 English, Four Knights, Kingside Fianchetto |
| 3. M Pacheco vs Illescas-Cordoba |
| 0-1 | 65 |
2002 |
Bled Olympiad | E00 Queen's Pawn Game |
| 4. G Timoshchenko vs M Pacheco |
| 1-0 | 47 |
2002 |
Bled ol (Men) | E12 Queen's Indian |
| 5. M Pacheco vs D Rowe |
| 1-0 | 59 |
2002 |
Bled ol (Men) | E10 Queen's Pawn Game |
| 6. M Pacheco vs D Sermek |
| ½-½ | 57 |
2002 |
Bled Olympiad | A59 Benko Gambit |
| 7. R Sadykov vs M Pacheco |
| 1-0 | 28 |
2003 |
World Junior Championships | C18 French, Winawer |
| 8. D Schneider vs M Pacheco |
| 1-0 | 87 |
2003 |
World Junior Championships | C17 French, Winawer, Advance |
| 9. M Pacheco vs Z Izoria |
| 0-1 | 83 |
2003 |
World Junior Championships | E91 King's Indian |
| 10. Kanep vs M Pacheco |
| 1-0 | 28 |
2003 |
World Junior Championships | D11 Queen's Gambit Declined Slav |
| 11. M Pacheco vs R Khouseinov |
| 1-0 | 58 |
2004 |
36th Olympiad | A53 Old Indian |
| 12. M Pacheco vs C J Blanco |
| 1-0 | 39 |
2004 |
36th Olympiad | D13 Queen's Gambit Declined Slav, Exchange Variation |
| 13. A Corke vs M Pacheco |
| 1-0 | 70 |
2004 |
36th Olympiad | D13 Queen's Gambit Declined Slav, Exchange Variation |
| 14. M Pacheco vs M Quinn |
| ½-½ | 40 |
2004 |
36th Olympiad | A61 Benoni |
| 15. M Pacheco vs N Zilberman |
| ½-½ | 38 |
2004 |
36th Olympiad | E90 King's Indian |
| 16. S Barrientos-Chavarriaga vs M Pacheco |
| 1-0 | 78 |
2004 |
36th Olympiad | C01 French, Exchange |
| 17. E Campos vs M Pacheco |
| 1-0 | 35 |
2004 |
36th Olympiad | B40 Sicilian |
| 18. M Pacheco vs E Van Beers |
| ½-½ | 27 |
2004 |
36th Olympiad | E15 Queen's Indian |
| 19. J F Cubas vs M Pacheco |
| 1-0 | 55 |
2004 |
36th Olympiad | B40 Sicilian |
| 20. M Bluvshtein vs M Pacheco |
| 1-0 | 49 |
2004 |
36th Olympiad | D17 Queen's Gambit Declined Slav |
| 21. M Pacheco vs F Jenni |
| ½-½ | 74 |
2006 |
37th Chess Olympiad | E97 King's Indian |
| 22. K Lie vs M Pacheco |
| 1-0 | 41 |
2006 |
37th Chess Olympiad | C02 French, Advance |
| 23. D Gormally vs M Pacheco |
| 0-1 | 46 |
2006 |
37th Chess Olympiad | A01 Nimzovich-Larsen Attack |
| 24. M Pacheco vs R Damaso |
| ½-½ | 39 |
2006 |
37th Chess Olympiad | E91 King's Indian |
| 25. M Pacheco vs D Camarasa |
| 1-0 | 63 |
2006 |
37th Chess Olympiad | D13 Queen's Gambit Declined Slav, Exchange Variation |