Katrine Tjølsen (born 1993) is a Norwegian chess player.

[1] She achieved the title Woman FIDE Master in 2008, and was awarded the Woman International Master title in 2010.

[1][2] She represented Norway in the Women's Chess Olympiad in 2008 and 2010.

[3] Tjølsen has been named as the model for investigator "Patricia Louise Borchmann" in a series of crime novels by Hans Olav Lahlum.

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