| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. C Storey vs L D'Costa |
| 1-0 | 31 |
1999 |
Ch Great Britain, Scarborough (England) | B54 Sicilian |
| 2. A P Smith vs L D'Costa |
| 1-0 | 23 |
1999 |
Ch Great Britain, Scarborough (England) | B60 Sicilian, Richter-Rauzer |
| 3. L Lee vs L D'Costa |
| 1-0 | 57 |
1999 |
Ch Great Britain, Scarborough (England) | B50 Sicilian |
| 4. G Lane vs L D'Costa |
| 1-0 | 60 |
2001 |
Smith & Williamson ch-GBR | B50 Sicilian |
| 5. D Sime vs L D'Costa |
| 0-1 | 37 |
2001 |
Glorney Cup | B73 Sicilian, Dragon, Classical |
| 6. R Eames vs L D'Costa |
| 0-1 | 35 |
2001 |
Smith & Williamson ch-GBR | B89 Sicilian |
| 7. G Walsh vs L D'Costa |
| 0-1 | 21 |
2001 |
Glorney Cup | B30 Sicilian |
| 8. M Turner vs L D'Costa |
| 1-0 | 25 |
2001 |
Smith & Williamson ch-GBR | B22 Sicilian, Alapin |
| 9. Zhao Zong Yuan vs L D'Costa |
| ½-½ | 18 |
2001 |
Smith & Williamson ch-GBR | B57 Sicilian |
| 10. M Sagafos vs L D'Costa |
| 1-0 | 48 |
2001 |
EYCC B18 | B73 Sicilian, Dragon, Classical |
| 11. M Erwich vs L D'Costa |
| 1-0 | 55 |
2001 |
Glorney Cup | B73 Sicilian, Dragon, Classical |
| 12. Ganguly vs L D'Costa |
| ½-½ | 103 |
2002 |
British Chess Championships | B74 Sicilian, Dragon, Classical |
| 13. R Pastres vs L D'Costa |
| 0-1 | 33 |
2005 |
E.U. Championship and Cork Chess Congress | B43 Sicilian, Kan, 5.Nc3 |
| 14. S Cicak vs L D'Costa |
| 1-0 | 44 |
2005 |
E.U. Championship and Cork Chess Congress | B40 Sicilian |
| 15. T Wippermann vs L D'Costa |
| 0-1 | 36 |
2005 |
E.U. Championship and Cork Chess Congress | B23 Sicilian, Closed |
| 16. C W Pritchett vs L D'Costa |
| ½-½ | 32 |
2005 |
E.U. Championship and Cork Chess Congress | B42 Sicilian, Kan |
| 17. W Meulblok vs L D'Costa |
| ½-½ | 76 |
2007 |
Hogeschool Zeeland Tournament | B41 Sicilian, Kan |
| 18. T Hillarp Persson vs L D'Costa |
| 0-1 | 55 |
2008 |
European Union Championships | B89 Sicilian |
| 19. V Malisauskas vs L D'Costa |
| ½-½ | 26 |
2008 |
Euro Club Cup | B43 Sicilian, Kan, 5.Nc3 |
| 20. M Yeo vs L D'Costa |
| 0-1 | 35 |
2008 |
European Union Championships | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 21. Shirov vs L D'Costa |
 | 1-0 | 28 |
2008 |
Euro Club Cup | B42 Sicilian, Kan |
| 22. L O'Toole vs L D'Costa |
| 0-1 | 31 |
2008 |
Euro Club Cup | B83 Sicilian |
| 23. B Hague vs L D'Costa |
| 0-1 | 55 |
2008 |
4NCL 2007-8 | B22 Sicilian, Alapin |
| 24. I Rees vs L D'Costa |
| ½-½ | 32 |
2008 |
Club Argentino-Ruibal | B42 Sicilian, Kan |
| 25. J C Ibarra Jerez vs L D'Costa |
 | 0-1 | 35 |
2009 |
10th European Individual Championship | B41 Sicilian, Kan |