If anyone is wondering about the inclusion of Chess in the list of keywords for this film, it features a number of scenes where chess matches are played or discussed.
In some early scenes the students are seen at the café they frequent, playing chess; in one scene the game provides the metaphor for the planned assassination.
Later, when Princip is shown in prison at Theresienstadt, he has conversations with the prison doctor, and they play chess by memory (ie without a board). (The games featured look like real games, using the Paris Defence, unlike some depictions of chess in films).
The film itself was an interesting slant on a very familiar piece of history, by showing the affair entirely from the perspective of the students. (In doing so it pretty much glossed over the fact they killed two people, and plunged the world into a war that cost millions of lives, but maybe we know that well enough for it not to be objectionable.) An interesting exercise.