| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. D Sadkowski vs M Andersen |
| ½-½ | 40 | 1978 | 12th International Junior Tournament | A94 Dutch, Stonewall with Ba3 |
| 2. M Andersen vs E Tangborn |
| 1-0 | 60 | 1978 | 12th International Junior Tournament | C05 French, Tarrasch |
| 3. A Lauvsnes vs M Andersen |
| 0-1 | 34 | 1978 | 12th International Junior Tournament | A10 English |
| 4. M Andersen vs P Gerbert |
| ½-½ | 30 | 1978 | 12th International Junior Tournament | B02 Alekhine's Defense |
| 5. B Zueger vs M Andersen |
| 1-0 | 42 | 1978 | 12th International Junior Tournament | A94 Dutch, Stonewall with Ba3 |
| 6. M Andersen vs H Cardon |
| ½-½ | 18 | 1978 | 12th International Junior Tournament | B08 Pirc, Classical |
| 7. M Andersen vs E Di Cera |
| 0-1 | 54 | 1978 | 12th International Junior Tournament | B08 Pirc, Classical |
| 8. W Barbier vs M Andersen |
| ½-½ | 40 | 1978 | 12th International Junior Tournament | A00 Uncommon Opening |
| 9. M Andersen vs K Allen |
| 1-0 | 40 | 1978 | 12th International Junior Tournament | B22 Sicilian, Alapin |
| 10. M Andersen vs C Hartman |
| 0-1 | 40 | 1980 | International Junior Tournament | B22 Sicilian, Alapin |
| 11. M Andersen vs C Pieper-Emden |
| ½-½ | 40 | 1980 | International Junior Tournament | A02 Bird's Opening |
| 12. M Andersen vs J Christensen |
| 1-0 | 18 | 1980 | International Junior Tournament | A07 King's Indian Attack |
| 13. M Andersen vs C Hansen |
| ½-½ | 39 | 1980 | International Junior Tournament | B22 Sicilian, Alapin |
| 14. K Rasmussen vs M Andersen |
| 0-1 | 33 | 1980 | International Junior Tournament | C77 Ruy Lopez |
| 15. M Trepp vs M Andersen |
| ½-½ | 43 | 1980 | International Junior Tournament | B01 Scandinavian |
| 16. L A Nielsen vs M Andersen |
| 0-1 | 39 | 1980 | International Junior Tournament | B00 Uncommon King's Pawn Opening |
| 17. L Schandorff vs M Andersen |
| ½-½ | 34 | 1980 | International Junior Tournament | B00 Uncommon King's Pawn Opening |
| 18. J Fredgaard vs M Andersen |
| 0-1 | 40 | 2004 | North Sea Cup | B21 Sicilian, 2.f4 and 2.d4 |
| 19. C K Pedersen vs M Andersen |
| 1-0 | 38 | 2004 | North Sea Cup | D55 Queen's Gambit Declined |
| 20. M Andersen vs J Sorensen |
| 1-0 | 51 | 2004 | North Sea Cup | A70 Benoni, Classical with 7.Nf3 |
| 21. M Andersen vs A Munch |
| 1-0 | 26 | 2004 | North Sea Cup | C18 French, Winawer |
| 22. J Rendboe vs M Andersen |
| 0-1 | 41 | 2004 | North Sea Cup | E58 Nimzo-Indian, 4.e3, Main line with 8...Bxc3 |
| 23. M Andersen vs K Damm |
| 1-0 | 50 | 2004 | North Sea Cup | A56 Benoni Defense |
| 24. R Skytte vs M Andersen |
| 1-0 | 45 | 2004 | North Sea Cup | B09 Pirc, Austrian Attack |
| 25. M Andersen vs C Hoi |
| 0-1 | 22 | 2004 | North Sea Cup | B06 Robatsch |
Kibitzing
