I've heard of castling before, but didn't know how it worked. I have never heard of an en-passant capture. Glad I'm learning this stuff now, before the jam starts :P.
There are also chess variants:
This website lets you play them against a bot or a friend.
Wow, En passant was completely new to me too!
Looks like it was added in the 15th century, this is what I get for not reading the patch notes!
Apparently it was a nerf added after the double-first-move made pawns too OP.
So yeah pretty much!
chess 960 is honestly terrifying
http://reallybadchess.com/ is also great
Oh and don't forget all the Stalemate/Draw rules. Some of them were new to me as well: