2 games · 2012–2019 · 2 classical · 0 online
Karlsson 20 draws0 Nielsen
100.0% for Karlsson
Openings between them
| A07 | King's Indian Attack | 1 | 100.0% |
| B07 | Modern Defense: Geller's System | 1 | 100.0% |
All games
| Nielsen, Pa1806 | 0-1 | Karlsson, J2114 | Xtracon Chess Open 2019 | 2019 |
| Karlsson, J2163 | 1-0 | Nielsen, Pa1774 | Politiken Cup 2012 | 2012 |