Classic: Queenside

And now the other way — queenside castling from the same familiar position! The king goes to c1, and the rook runs all the way from the a1 corner to d1 and stands beside him like a bodyguard. I used to mix up which side was the "long" one — remember: it's the one with the queenside flank. Drag the king onto the rook on a1!

O-O-O! Both classical castlings are in your collection!