sentences:  Ekström was active in high-level national Swedish and international chess during a short period of just over five years in the 1940s, with some very impressive successes.He won at Stockholm 1942, tied with Stig Lundholm, ahead of both Gösta Stoltz and Erik Lundin, both of whom became Grandmasters later on.Then at Stockholm 1943/44, he won ahead of Lundholm.