Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. A Kosten vs F Sanz Alonso |
| 1-0 | 25 | 1978 | Hastings Challengers 1978/79 | C29 Vienna Gambit |
2. A Kosten vs B Kurajica |
  | 1-0 | 38 | 1980 | Evening Standard Chess Congress | B81 Sicilian, Scheveningen, Keres Attack |
3. A Kosten vs C Morris |
| 1-0 | 24 | 1981 | Bristol op | B42 Sicilian, Kan |
4. A Kosten vs Miles |
| 0-1 | 63 | 1981 | Bristol op | B42 Sicilian, Kan |
5. N Bradbury vs A Kosten |
| 0-1 | 32 | 1981 | ARC Young Masters | A61 Benoni |
6. A Kosten vs G West |
| ½-½ | 31 | 1981 | ARC Young Masters | C64 Ruy Lopez, Classical |
7. D P Mooney vs A Kosten |
| 1-0 | 31 | 1981 | ARC Young Masters | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
8. S Taulbut vs A Kosten |
| 1-0 | 49 | 1981 | ARC Young Masters | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
9. A Kosten vs N Carr |
| 1-0 | 43 | 1981 | ARC Young Masters | B15 Caro-Kann |
10. A Kosten vs J Cox |
| 0-1 | 68 | 1981 | ARC Young Masters | C00 French Defense |
11. A Kosten vs Chandler |
| ½-½ | 22 | 1981 | 5th Lloyds Bank Masters Open | B16 Caro-Kann, Bronstein-Larsen Variation |
12. H van Parreren vs A Kosten |
| 0-1 | 40 | 1981 | 5th Lloyds Bank Masters Open | B08 Pirc, Classical |
13. J Levitt vs A Kosten |
| 0-1 | 38 | 1981 | 5th Lloyds Bank Masters Open | A64 Benoni, Fianchetto, 11...Re8 |
14. A Kosten vs G Ligterink |
| ½-½ | 49 | 1981 | 5th Lloyds Bank Masters Open | B44 Sicilian |
15. A Kosten vs G Iskov |
| 1-0 | 35 | 1981 | 5th Lloyds Bank Masters Open | B40 Sicilian |
16. P Gerbert vs A Kosten |
| 1-0 | 43 | 1981 | 5th Lloyds Bank Masters Open | B06 Robatsch |
17. A Kosten vs J Arnason |
| 0-1 | 43 | 1981 | Manchester Benedictine Open | B40 Sicilian |
18. A Kosten vs M Basman |
 | 0-1 | 35 | 1981 | Manchester Benedictine Open | B00 Uncommon King's Pawn Opening |
19. A Kosten vs K Pytel |
| 0-1 | 34 | 1981 | Lewisham International | B32 Sicilian |
20. D King vs A Kosten |
| ½-½ | 36 | 1981 | Lewisham International | C43 Petrov, Modern Attack |
21. N R Oliver vs A Kosten |
| 0-1 | 29 | 1981 | Lewisham International | C44 King's Pawn Game |
22. A Kosten vs E Schiller |
 | 1-0 | 41 | 1981 | Lewisham International | B18 Caro-Kann, Classical |
23. K Berg vs A Kosten |
 | 0-1 | 13 | 1981 | Lewisham International | C29 Vienna Gambit |
24. A Kosten vs A Kuligowski |
 | 0-1 | 29 | 1981 | Lewisham International | B96 Sicilian, Najdorf |
25. A Kosten vs G Iskov |
| 1-0 | 27 | 1981 | Lewisham International | B42 Sicilian, Kan |