Castling is a special move in chess where you simultaneously move your king, and one of your rooks. The king moves two squares towards a rook, and that rook moves to the square at the other side of the king. It started to be used prominently in the 17th Century. We join Pascal and Fredrik’s game in the Prussian city of Stettin in 1701.
Pascal: Are you sure you’d like to move your Knight there, my friend?
Fredrik: I suppose.
Pascal: Haha. My Bishop takes your Pawn and you are in check mate! You fool!
Fredrik: No. I’m not in checkmate.
Pascal: Yes you are, you buffoon. Can you not see that? You’ve left your king exposed and he has no where to go.
Fredrik castles his King and Rook.
Fredrik: I’m not in check now.
Pascal: You can’t do that! That’s illegal. You can’t move your king more than two spaces. Plus you were in check. Are you some type of imbecile that can’t understand the rules of the game?
Fredrik pulls out a small pistol and points it at Pascal.
Fredrik: It’s called Castling. And it’s a chess move now.
Pascal: Ok, ok, jeez. I’ll just castle my King too.
Fredrik cocks the pistol.
Fredrik: Only people named Fredrik are allowed to do it.