Established a subgenre?
I saw an Estonian movie tonight, The Fencer (http://www.imdb.com/title/tt2534634/combined), which reminded me of The Bad News Bears. Thinking about it a little more, there are lots of movies that involve a ragtag group of kids training at some sport or game, usually under an adult coach who himself is working through various issues, and then competing on a national level. Another example that comes to mind is The Dark Horse (http://www.imdb.com/title/tt2192016/combined), an excellent movie from New Zealand about a former chess champion, who has a mental illness, coaching a group of at-risk kids to compete in the national chess championships.
Arguably Stand and Deliver (http://www.imdb.com/title/tt0094027/combined) also fits in this pattern.
My question is this: can The Bad News Bears be said to have established and characterized this movie subgenre? Or else what similar movies are there that predate 1976?