I never did understand en passant...
Tomb Chess is pretty fun - it's like chess, without all of the complicated rules, more randomness, and undead pieces. Basically, the board is a graveyard, and the pieces are "buried" until you decide to release one without knowing what type of piece it is - or even if it is your or your opponents'. There are no tricky moving rules - just left/right or up/down. With the simplicity and the randomness, you can't think too much, so it moves a lot faster - it truly is the internet version of chess....