GMJohan-Sebastian Christiansen

Johan-Sebastian Christiansen became interested in chess at six. At sixteen, he chose the chess program at Norway's NTG sports school over pursuing football. He began his club career with Caissa in Sandefjord, later playing for Vålerenga and Offerspill. FIDE awarded him the international master title in 2015. The following year, he won the Nordic under-20 championship with a perfect score.

His grandmaster norms came at the 2017 European Team Championship and tournaments in Pardubice and Gothenburg in 2018. He received the GM title that year. In 2019, he finished twelfth at the European Individual Championship and reached the World Cup's second round. He won the inaugural Colonia de Sant Jordi Chess Festival in 2022 on tiebreak ahead of Brandon Clarke. Beyond tournament chess, he appeared in the Norwegian television program Forræder in 2026.