Is it "The only movie in the world that 99% of the population has not seen"?
It certainly seems that way. Actually, now that I think of it, probably much, much less than 1% of the population has seen this movie. But still, awesome people of this forum have cracked some much more obscure films than this one.

Come on, people, cheat and guess it already.

We've already established that the lead actor is Moritz Bleibtreu, and it's quite obvious that the film is european and it features some chess-playing (romanian) border guards. It's also pretty damn good.
