He took 8th at Copenhagen 1916 (the 9th Nordic Chess Championship, Paul Johner won), took 2nd at Stockholm 1916, tied for 7-8th at Göteborg 1920 (B-tournament, Johner won), took 3rd and won ahead of Karl Berndtsson and Gustaf Nyholm at Jönköping 1921, and took 4th at Uppsala 1923 (Allan Nilsson and Anton Olson won).
- Gaige, Jeremy (1987), Chess Personalia, A Biobibliography, McFarland, p. 191, ISBN 0-7864-2353-6
Note: Chess Personalia spells his last name "Jacobsen", but this may be a typo. The entry is alphabetized as if it were spelled "Jacobson" and Gaige uses that spelling in other works such as his tournament crosstables.
- "Archived copy" (PDF). Archived from the original (PDF) on 2007-07-04. Retrieved 2012-02-19. Name Index to Jeremy Gaige's Chess Tournament Crosstables, An Electronic Edition, Anders Thulin, Malmö, 2004-09-01
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