| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. L D'Costa vs A Webster |
| 0-1 | 46 |
1999 |
Ch Great Britain, Scarborough (England) | B06 Robatsch |
| 2. L D'Costa vs H Richards |
| 1-0 | 39 |
1999 |
Ch Great Britain, Scarborough (England) | C02 French, Advance |
| 3. L D'Costa vs J McDonnell |
| 0-1 | 47 |
1999 |
Ch Great Britain, Scarborough (England) | B63 Sicilian, Richter-Rauzer Attack |
| 4. L Lee vs L D'Costa |
| 1-0 | 57 |
1999 |
Ch Great Britain, Scarborough (England) | B50 Sicilian |
| 5. A Summerscale vs L D'Costa |
| 1-0 | 45 |
1999 |
Ch Great Britain, Scarborough (England) | A57 Benko Gambit |
| 6. L D'Costa vs C Harris |
| 0-1 | 40 |
1999 |
Ch Great Britain, Scarborough (England) | B12 Caro-Kann Defense |
| 7. C Storey vs L D'Costa |
| 1-0 | 31 |
1999 |
Ch Great Britain, Scarborough (England) | B54 Sicilian |
| 8. A P Smith vs L D'Costa |
| 1-0 | 23 |
1999 |
Ch Great Britain, Scarborough (England) | B60 Sicilian, Richter-Rauzer |
| 9. A Summerscale vs L D'Costa |
| ½-½ | 23 |
2001 |
Smith & Williamson ch-GBR | D82 Grunfeld, 4.Bf4 |
| 10. L D'Costa vs P Lagowski |
| 0-1 | 40 |
2001 |
EYCC B18 | B06 Robatsch |
| 11. M Erwich vs L D'Costa |
| 1-0 | 55 |
2001 |
Glorney Cup | B73 Sicilian, Dragon, Classical |
| 12. L D'Costa vs C Hanley |
| ½-½ | 19 |
2001 |
Smith & Williamson ch-GBR | A10 English |
| 13. L D'Costa vs B Kelly |
| ½-½ | 18 |
2001 |
Smith & Williamson ch-GBR | D43 Queen's Gambit Declined Semi-Slav |
| 14. L D'Costa vs J Werle |
| 0-1 | 38 |
2001 |
EYCC B18 | A15 English |
| 15. L D'Costa vs M Bissieres |
| ½-½ | 58 |
2001 |
Glorney Cup | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 16. M Turner vs L D'Costa |
| 1-0 | 25 |
2001 |
Smith & Williamson ch-GBR | B22 Sicilian, Alapin |
| 17. L D'Costa vs R Willmoth |
| 0-1 | 40 |
2001 |
4NCL | A41 Queen's Pawn Game (with ...d6) |
| 18. L D'Costa vs C Crouch |
| 1-0 | 38 |
2001 |
Smith & Williamson ch-GBR | A45 Queen's Pawn Game |
| 19. G Lane vs L D'Costa |
| 1-0 | 60 |
2001 |
Smith & Williamson ch-GBR | B50 Sicilian |
| 20. D Sime vs L D'Costa |
| 0-1 | 37 |
2001 |
Glorney Cup | B73 Sicilian, Dragon, Classical |
| 21. L D'Costa vs A Ledger |
| ½-½ | 23 |
2001 |
Smith & Williamson ch-GBR | B17 Caro-Kann, Steinitz Variation |
| 22. M Sagafos vs L D'Costa |
| 1-0 | 48 |
2001 |
EYCC B18 | B73 Sicilian, Dragon, Classical |
| 23. Zhao Zong-Yuan vs L D'Costa |
| ½-½ | 18 |
2001 |
Smith & Williamson ch-GBR | B57 Sicilian |
| 24. L D'Costa vs R Palliser |
| ½-½ | 40 |
2001 |
Smith & Williamson ch-GBR | A20 English |
| 25. G Walsh vs L D'Costa |
| 0-1 | 21 |
2001 |
Glorney Cup | B30 Sicilian |