This question is partially inspired by some of Omega's comments in the BJJ nutriding rants.
Just what the hell is Sambo anyway?
The only thing I've ever really heard about this art is that it's grappling, focuses on leg locks, and is Russian in origin (and I'm not even sure on that last point).
How does Sambo differ from other grappling arts? Are there Sambo tournaments/sport competitions and how are they scored? (for example: BJJ is to submission but points can be scored by getting dominate position, Judo is to ippon or submission but points can be score by lesser throws, etc).
I'm genuinely curious. I tried the search function but wasn't able to pin down a good description of the art itself.