Teen Wolf, Season 3

Derek:
Back in his room, Stiles had a board with my name on one of the pieces. If this is a game to him, then I need to figure out the plays.

Peter:
Not so easy to do when it's a game without rules.

Derek:
[frowns] What does that mean?

Peter:
You're dealing with the kind of spirit that's lived too long to play by human rules. It's a fox spirit that chose to become human. And supposedly, that's something that can do only after about a hundred years. If a kitsune is an annoying pain in the ass, then a nogitsune, which is a dark kitsune, is a freaking disaster. Besides, chess is Stiles' game. It's not the game of a Japanese fox.