Baileymate (a game to help them learn how to check and what pieces do what)
Have to put me in check
Have to use big pieces and then the pawns
Once you use the big pieces they are stuck
If you leave one unprotected I take it
En passant
Only can do it on the pawns
When a pawn crosses half way it deserves respect
You have to give the pawn a chance to respect you by moving just one square to the pawn who is across half way
If you choose to disrespect that pawn the pawn that has moved past half way can still take you by moving across the diagonal and taking the disrespecting pawn.
You can do it with every pawn on the board
It must be the two pawns either side of the pawn who deserves respect
It must happen straight after the pawn has been disrespected, the very next turn.