| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. L Arnold vs G Franzoni |
| ½-½ | 25 | 1976 | World Championship (U17) | A07 King's Indian Attack |
| 2. L Arnold vs T Salen |
| 1-0 | 36 | 1976 | World Championship (U17) | B02 Alekhine's Defense |
| 3. L Arnold vs D Walker |
| 1-0 | 39 | 1976 | World Championship (U17) | B06 Robatsch |
| 4. L Arnold vs A Chia |
| 1-0 | 41 | 1976 | World Championship (U17) | B14 Caro-Kann, Panov-Botvinnik Attack |
| 5. S Semkov vs L Arnold |
| 1-0 | 44 | 1976 | World Championship (U17) | A66 Benoni |
| 6. P Nikolic vs L Arnold |
| 1-0 | 68 | 1976 | World Championship (U17) | A17 English |
| 7. D Roos vs L Arnold |
| ½-½ | 34 | 1976 | World Championship (U17) | A07 King's Indian Attack |
| 8. D Dunne vs L Arnold |
| 1-0 | 60 | 1976 | World Championship (U17) | B33 Sicilian |
| 9. L Arnold vs Petursson |
| 0-1 | 73 | 1976 | World Championship (U17) | B84 Sicilian, Scheveningen |
| 10. L Arnold vs G de Boer |
| ½-½ | 40 | 1978 | European Junior Championship 1978/79 | C19 French, Winawer, Advance |
| 11. K Valkesalmi vs L Arnold |
| 1-0 | 50 | 1978 | European Junior Championship 1978/79 | B97 Sicilian, Najdorf |
| 12. L Arnold vs A Hessenbruch |
| 0-1 | 52 | 1978 | European Junior Championship 1978/79 | C45 Scotch Game |
| 13. R Ratti vs L Arnold |
| ½-½ | 18 | 1978 | European Junior Championship 1978/79 | B30 Sicilian |
| 14. L Arnold vs D Levacic |
| ½-½ | 41 | 1978 | European Junior Championship 1978/79 | C10 French |
| 15. E Swoboda vs L Arnold |
| ½-½ | 61 | 1978 | European Junior Championship 1978/79 | A28 English |
| 16. D Cramling vs L Arnold |
| ½-½ | 37 | 1978 | European Junior Championship 1978/79 | E91 King's Indian |
| 17. L Arnold vs P Heaven |
| 1-0 | 25 | 1978 | European Junior Championship 1978/79 | B92 Sicilian, Najdorf, Opocensky Variation |
| 18. L Arnold vs T Natsis |
 | 1-0 | 19 | 1978 | European Junior Championship 1978/79 | B30 Sicilian |
| 19. L Arnold vs H Freise |
| 1-0 | 37 | 1979 | Baden Kongress Meisterturnier A | B31 Sicilian, Rossolimo Variation |
| 20. I Gazik vs L Arnold |
| 1-0 | 43 | 1979 | European Junior Championship 1978/79 | B45 Sicilian, Taimanov |
| 21. L Arnold vs J Pereira Santos |
| 0-1 | 26 | 1979 | European Junior Championship 1978/79 | B18 Caro-Kann, Classical |
| 22. B Neuenschwander vs L Arnold |
| ½-½ | 61 | 1979 | European Junior Championship 1978/79 | A48 King's Indian |
| 23. L Zimmermann vs L Arnold |
| 1-0 | 39 | 1979 | European Junior Championship 1978/79 | B22 Sicilian, Alapin |
| 24. G Kiefer vs L Arnold |
| 0-1 | 56 | 1980 | Baden-ch MA | B29 Sicilian, Nimzovich-Rubinstein |
| 25. R Busch vs L Arnold |
| 0-1 | 52 | 1980 | Mosbach Elo | A67 Benoni, Taimanov Variation |
Kibitzing
