| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. M Gagunashvili vs A Longson |
| 1-0 | 92 | 1998 | Istanbul U16 | A53 Old Indian |
| 2. Plaskett vs A Longson |
| 1-0 | 51 | 1998 | Isle of Man Open | B25 Sicilian, Closed |
| 3. A Longson vs M Whitehead |
| ½-½ | 25 | 1998 | Isle of Man Open | B25 Sicilian, Closed |
| 4. A Longson vs S Collins |
| 1-0 | 35 | 1998 | Isle of Man Open | B83 Sicilian |
| 5. D Sedgwick vs A Longson |
| ½-½ | 52 | 1998 | Isle of Man Open | B20 Sicilian |
| 6. A Longson vs R O'Rourke |
| 1-0 | 73 | 1998 | Isle of Man Open | B90 Sicilian, Najdorf |
| 7. N Miezis vs A Longson |
| 1-0 | 59 | 1998 | Isle of Man Open | A16 English |
| 8. A Longson vs J Shaw |
| 0-1 | 53 | 1998 | Isle of Man Open | B32 Sicilian |
| 9. P J Benson vs A Longson |
| 1-0 | 34 | 1998 | Isle of Man Open | C13 French |
| 10. A Longson vs J Hickman |
| 1-0 | 41 | 1998 | Isle of Man Open | B07 Pirc |
| 11. A Longson vs J Fraser-Mitchell |
| 0-1 | 28 | 1999 | Isle of Man Open | A07 King's Indian Attack |
| 12. H Winfridsson vs A Longson |
| 0-1 | 58 | 1999 | Isle of Man Open | B90 Sicilian, Najdorf |
| 13. A Longson vs J Rowson |
| 0-1 | 34 | 1999 | Isle of Man Open | B25 Sicilian, Closed |
| 14. M Thiruchelvam vs A Longson |
| ½-½ | 45 | 1999 | Isle of Man Open | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 15. A Longson vs J Hickman |
| ½-½ | 61 | 1999 | Isle of Man Open | B07 Pirc |
| 16. D F Hill vs A Longson |
| ½-½ | 55 | 1999 | Isle of Man Open | A53 Old Indian |
| 17. A Longson vs P Taylor |
| 1-0 | 48 | 1999 | Isle of Man Open | B18 Caro-Kann, Classical |
| 18. Kosteniuk vs A Longson |
| ½-½ | 46 | 1999 | Isle of Man Open | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 19. A Longson vs C Daly |
| ½-½ | 59 | 1999 | Isle of Man Open | A07 King's Indian Attack |
| 20. C Waters vs A Longson |
| 0-1 | 49 | 2003 | British Championship | A00 Uncommon Opening |
| 21. A Longson vs C Hanley |
| ½-½ | 39 | 2003 | British Championship | B01 Scandinavian |
| 22. A Longson vs D Gormally |
| 0-1 | 35 | 2003 | British Championship | B07 Pirc |
| 23. G D Lee vs A Longson |
| ½-½ | 72 | 2003 | British Championship | B22 Sicilian, Alapin |
| 24. A Longson vs P J Sowray |
 | 1-0 | 34 | 2003 | British Championship | C97 Ruy Lopez, Closed, Chigorin |
| 25. S Collins vs A Longson |
| ½-½ | 47 | 2003 | British Championship | C41 Philidor Defense |
Kibitzing
