Brainwashed
Schachnovelle (original)
Werner von Basil (a Austrian intellectual) was captured by the Nazi in 1938. The want to break him to confess smuggling. Without any mental sustenance, the only thing left to keep his mind busy is an old tactics book for chess.
Starring Curd Jürgens, Claire Bloom, Hansjörg Felmy, Mario Adorf, Hans Söhnker, Rudolf Forster, Jan Hendriks, Albert Lieven, Dietmar Schönherr, Wolfgang Wahl
It's a drama movie, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of movie.
Watch it here
Not found streaming from Finland.