Johan-Sebastian Christiansen (born 10 June 1998) is a Norwegian chess grandmaster.
[1] Christiansen first played for the Sandefjord based chess club Caissa, and later for Vålerenga and Offerspill.
[1] He achieved the norms required for the title of Grandmaster in the 2017 European Team Chess Championship in Hersonissos, in Pardubice in July 2018 and in Gothenburg in August 2018.
[2] In 2022, Christiansen won the 1st Colonia de Sant Jordi Chess Festival on a tie-break with Brandon Clarke, with a score of 7.5/9[3] https://chess24.com/en/read/news/carlsen-karjakin-as-new-in-chess-classic-starts-saturday
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