En Passant?

I do not think there is, but I'll try to explain to you how to use it.   Say you have a white pawn on b2 and a black pawn on c4. If b2 moves up 2 spots (in 1 turn) making the two pawns next to each other (b4 and c4) the black pawn may capture the white pawn by moving to b3.  This only works if the pawn moves up 2 squares in 1 turn. The part which I am not 100% sure is if black can wait more than one turn to capture the b4 pawn

No, the pawn on c4 can only capture the b2-b4 pawn on the next move. After that, the b4 pawn is safe from the one on c4. 

"En Passant" means "In Passing", so think of it as capturing a Pawn while it *passes through* a space guarded by another Pawn.

https://www.chess.com/lessons/playing-the-game/en-passant 

x

     But remember it can only be done on that one move, while it is passing. If you let it go by, you can't use en passant later.

go to youtube and search "en passant" ...all you need is there.

note however, you must capture en passant on your very next move or else you have lost the opportunity.

I believe this rule was instituted sometime in the past (don't ask me what year) when the pawn's move used to be only one square forward on the first move. Then, to speed up the game, the pawn's move was increased to two squares, but only on the first move. Opponents complained, however, that they'd gotten all the way to the 5th rank with their pawn, and their opponent escaped capture by moving two squares instead of one. Thus was en passant born.

]