| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. D Shapiro vs C R Riordan |
| 0-1 | 48 |
2001 |
US Open | D97 Grunfeld, Russian |
| 2. R Anderson vs C R Riordan |
| 1-0 | 63 |
2001 |
US Open | C18 French, Winawer |
| 3. M Hoekstra vs C R Riordan |
 | ½-½ | 20 |
2001 |
US Open | C07 French, Tarrasch |
| 4. C R Riordan vs G Sagalchik |
 | 0-1 | 21 |
2001 |
US Open | D08 Queen's Gambit Declined, Albin Counter Gambit |
| 5. C R Riordan vs Palatnik |
| 1-0 | 40 |
2001 |
US Open | A57 Benko Gambit |
| 6. Paschall vs C R Riordan |
| 1-0 | 43 |
2001 |
US Amateur Team East | D44 Queen's Gambit Declined Semi-Slav |
| 7. C R Riordan vs J Diaz |
| ½-½ | 43 |
2005 |
USCL Miami vs Boston | A04 Reti Opening |
| 8. C R Riordan vs D Pruess |
| ½-½ | 94 |
2005 |
USCL Boston vs San Francisco | D43 Queen's Gambit Declined Semi-Slav |
| 9. C R Riordan vs Kaufman |
| ½-½ | 47 |
2005 |
USCL Baltimore vs Boston | A44 Old Benoni Defense |
| 10. C R Riordan vs Kaufman |
| ½-½ | 36 |
2005 |
USCL Boston vs Baltimore | B80 Sicilian, Scheveningen |
| 11. C R Riordan vs E Wilson |
| 1-0 | 58 |
2005 |
USCL Boston vs Philadelphia | D17 Queen's Gambit Declined Slav |
| 12. A Zapata vs C R Riordan |
| 1-0 | 34 |
2005 |
7th Foxwoods Open | B90 Sicilian, Najdorf |
| 13. G Braylovsky vs C R Riordan |
| 1-0 | 37 |
2005 |
USCL New York vs Boston | B31 Sicilian, Rossolimo Variation |
| 14. C R Riordan vs I Krush |
| ½-½ | 43 |
2007 |
Foxwoods Open | D58 Queen's Gambit Declined, Tartakower (Makagonov-Bondarevsky) Syst |
| 15. Z Maymin vs C R Riordan |
| 0-1 | 58 |
2007 |
Foxwoods Open | C00 French Defense |
| 16. O Iwu vs C R Riordan |
| ½-½ | 14 |
2007 |
Foxwoods Open | A46 Queen's Pawn Game |
| 17. C R Riordan vs A Ivanov |
| 0-1 | 31 |
2007 |
Foxwoods Open | A40 Queen's Pawn Game |
| 18. B Karen vs C R Riordan |
| 0-1 | 18 |
2007 |
Foxwoods Open | C12 French, McCutcheon |
| 19. C R Riordan vs R Simpson |
| 1-0 | 46 |
2008 |
United States Chess League | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
| 20. M Molner vs C R Riordan |
| 1-0 | 62 |
2008 |
United States Chess League | C55 Two Knights Defense |