| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Harris vs Weeramantry |
 | 0-1 | 23 |
1972 |
London | B09 Pirc, Austrian Attack |
| 2. Hill DM vs Weeramantry |
| 0-1 | 28 |
1972 |
Barnstaple op | E92 King's Indian |
| 3. Weeramantry vs O Sarapu |
| 0-1 | 40 |
1978 |
? | C44 King's Pawn Game |
| 4. Barnett vs Weeramantry |
| 0-1 | 31 |
1986 |
Estes Park | E92 King's Indian |
| 5. K Shirazi vs Weeramantry |
| 0-1 | 42 |
1988 |
Continental | B09 Pirc, Austrian Attack |
| 6. Weeramantry vs M Khatena |
| 0-1 | 47 |
1990 |
USA op | B02 Alekhine's Defense |
| 7. Weeramantry vs Igor Ivanov |
| 0-1 | 40 |
1990 |
It (open) | B23 Sicilian, Closed |
| 8. M Lamon vs Weeramantry |
| 0-1 | 25 |
1990 |
Jacksonville | B06 Robatsch |
| 9. Weeramantry vs Alburt |
| 0-1 | 18 |
1991 |
It (open) | B02 Alekhine's Defense |
| 10. L Pugh vs Weeramantry |
| 0-1 | 31 |
1992 |
Blitz:15' | E62 King's Indian, Fianchetto |
| 11. Weeramantry vs Shabalov |
| 0-1 | 55 |
1993 |
Philadelphia | B02 Alekhine's Defense |
| 12. Weeramantry vs Razuvaev |
| 0-1 | 40 |
1994 |
New York op | B23 Sicilian, Closed |
| 13. Weeramantry vs Gulko |
| 0-1 | 33 |
1994 |
USA | B23 Sicilian, Closed |
| 14. Ashley vs Weeramantry |
| 0-1 | 43 |
1998 |
It, Philadelphia (USA) | B06 Robatsch |
| 15. Weeramantry vs G Braylovsky |
| 0-1 | 66 |
2001 |
29th World Open | B23 Sicilian, Closed |
| 16. Weeramantry vs Paschall |
| 0-1 | 26 |
2001 |
29th World Open | B23 Sicilian, Closed |
| 17. J Kelleher vs Weeramantry |
| 0-1 | 30 |
2003 |
World Open: Open Section | B08 Pirc, Classical |
| 18. Weeramantry vs Kiriakov |
| 0-1 | 30 |
2003 |
World Open: Open Section | B01 Scandinavian |
| 19. Weeramantry vs J M Dominguez |
| 0-1 | 54 |
2004 |
36th Olympiad | C50 Giuoco Piano |
| 20. Weeramantry vs M Poulsen |
| 0-1 | 28 |
2004 |
36th Olympiad | C40 King's Knight Opening |
| 21. S Ayyoubi vs Weeramantry |
| 0-1 | 46 |
2004 |
36th Olympiad | B30 Sicilian |
| 22. Weeramantry vs M Martinez |
| 0-1 | 33 |
2005 |
7th Foxwoods Open | C44 King's Pawn Game |
| 23. S Bergsson vs Weeramantry |
| 0-1 | 39 |
2005 |
Gibraltar Masters | E71 King's Indian, Makagonov System (5.h3) |
| 24. Weeramantry vs J Flores Chico |
| 0-1 | 33 |
2005 |
Gibraltar Masters | C12 French, McCutcheon |
| 25. Weeramantry vs E Campos |
| 0-1 | 29 |
2006 |
37th Chess Olympiad | B23 Sicilian, Closed |
