| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. E Mortensen vs J O Fries Nielsen |
| 1-0 | 29 |
1980 |
Copenhagen | A89 Dutch, Leningrad, Main Variation with Nc6 |
| 27. Yusupov vs J O Fries Nielsen |
| 1-0 | 57 |
1980 |
Esbjerg | E06 Catalan, Closed, 5.Nf3 |
| 28. E Ditt vs J O Fries Nielsen |
| ½-½ | 54 |
1980 |
Germany | A10 English |
| 29. J O Fries Nielsen vs Kurajica |
| ½-½ | 46 |
1980 |
Hamburg Favoriten | B30 Sicilian |
| 30. J O Fries Nielsen vs Savon |
| ½-½ | 15 |
1980 |
Esbjerg | A49 King's Indian, Fianchetto without c4 |
| 31. N J Fries Nielsen vs J O Fries Nielsen |
| ½-½ | 30 |
1981 |
DEN-ch | B06 Robatsch |
| 32. O Borik vs J O Fries Nielsen |
| 1-0 | 47 |
1981 |
BL 8182 Bochum-FH Hamburg | D43 Queen's Gambit Declined Semi-Slav |
| 33. L D Evans vs J O Fries Nielsen |
| ½-½ | 16 |
1981 |
It b | B22 Sicilian, Alapin |
| 34. J O Fries Nielsen vs C Hansen |
| 0-1 | 72 |
1981 |
DEN-ch | E16 Queen's Indian |
| 35. P B Knudsen vs J O Fries Nielsen |
| 0-1 | 26 |
1981 |
DEN-ch | A00 Uncommon Opening |
| 36. B Brinck-Claussen vs J O Fries Nielsen |
| 0-1 | 21 |
1981 |
It b | E12 Queen's Indian |
| 37. J O Fries Nielsen vs B Barth Sahl |
| ½-½ | 41 |
1981 |
DEN-ch | D02 Queen's Pawn Game |
| 38. J O Fries Nielsen vs Kavalek |
| ½-½ | 27 |
1981 |
BL 8182 FH Hamburg-Solingen | A45 Queen's Pawn Game |
| 39. J O Fries Nielsen vs K Berg |
 | 0-1 | 63 |
1981 |
It b | E10 Queen's Pawn Game |
| 40. J O Fries Nielsen vs L Kristensen |
| ½-½ | 25 |
1981 |
DEN-ch | A39 English, Symmetrical, Main line with d4 |
| 41. J O Fries Nielsen vs P E Nielsen |
| ½-½ | 27 |
1981 |
DEN-ch | B52 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 42. J O Fries Nielsen vs B Barth Sahl |
| ½-½ | 47 |
1981 |
It b | B09 Pirc, Austrian Attack |
| 43. E Mortensen vs J O Fries Nielsen |
| 1-0 | 51 |
1981 |
DEN-ch | B07 Pirc |
| 44. Chandler vs J O Fries Nielsen |
| 1-0 | 25 |
1981 |
BL 8182 HSK-FH Hamburg | C42 Petrov Defense |
| 45. H D Pedersen vs J O Fries Nielsen |
| ½-½ | 21 |
1981 |
It b | B06 Robatsch |
| 46. J O Fries Nielsen vs C Hansen |
 | 1-0 | 31 |
1981 |
It b | B03 Alekhine's Defense |
| 47. B Brinck-Claussen vs J O Fries Nielsen |
| 0-1 | 29 |
1981 |
DEN-ch | B08 Pirc, Classical |
| 48. J Pokojowczyk vs J O Fries Nielsen |
| 1-0 | 21 |
1981 |
It b | C05 French, Tarrasch |
| 49. J O Fries Nielsen vs J Hvenekilde |
| ½-½ | 40 |
1981 |
DEN-ch | E94 King's Indian, Orthodox |
| 50. J O Fries Nielsen vs S Weiss |
| ½-½ | 55 |
1981 |
BL 8182 FH Hamburg-SKJE | A46 Queen's Pawn Game |