| Copenhagen 1916 (4) |
Nordic Chess Congress - Minor Tournament |
9 | / | 13 |
| | | |
| Kristiania 1917 (2) |
Nordic Chess Congress - First Class |
7.5 | / | 12 |
| | | |
| Stockholm 1917 (4) |
1st Swedish Chess Federation Congress - Championship |
1.5 | / | 6 |
| | | |
| Stockholm 1918 (1) |
Stockholm Championship - Preliminary |
3 | / | 8 |
| | | |
| Goteborg 1918 |
2nd Swedish Chess Federation Congress - Championship |
3 | / | 7 |
| | | |
| Goteborg 1919 |
Nordic Chess Congress |
5.5 | / | 11 |
| | | |
| Goteborg 1920 (3) |
Göteborg Tournament - Section C |
10 | / | 13 |
| | | |
| Berlin 1922 (3) |
Germany - Sweden Match |
| | | | | | |
|
Nilsson, O. - Pahl, K. |
1.5 - 0.5 |
| | | |
| Goteborg and Stockholm 1923 |
Goteborg - Stockholm Telephone Match |
| | | | | | |
|
Nilsson, O. - Jacobson, Er. |
0.5 - 0.5 |
| | | |
| Stockholm 1926 (1) |
Goteborg - Stockholm Match |
| | | | | | |
|
Nilsson, O. - Jacobson, Er. |
1.5 - 0.5 |
| | | |
| Goteborg 1927 |
Goteborg - Stockholm Match |
| | | | | | |
|
Nilsson, O. - Dahl, G. |
1.5 - 0.5 |
| | | |
| Goteborg and Stockholm 1928 |
Goteborg - Stockholm Telephone Match |
| | | | | | |
|
Nilsson, O. - Sjostam, A. |
0.5 - 0.5 |
| | | |
| Goteborg 1941 (5) |
Copenhagen - Goteborg Cup Match |
| | | | | | |
|
Nilsson, O. - Cruusberg, A. |
0.5 - 0.5 |
| | | |
| Goteborg 1941 (6) |
Stockholm - Goteborg Cup Match |
| | | | | | |
|
Nilsson, O. - Andersson, K.W. |
1 - 0 |
| | | |
| Goteborg 1941 (9) |
Goteborg - Skane Cup Match |
| | | | | | |
|
Nilsson, O. - Wildh, G. |
0.5 - 0.5 |
| | | |
| Stockholm and Goteborg 1942 |
Stockholm - Goteborg Telephone Match |
| | | | | | |
|
Nilsson, O. - Skold, K. |
0.5 - 0.5 |
| | | |
| Stockholm and Goteborg 1945 |
Stockholm - Goteborg Telephone Match |
| | | | | | |
|
Nilsson, O. - Lindberg, L. |
0 - 1 |
| | | |
