All the squares between the king's initial and final squares (including the final square), and all the squares between the rook's initial and final squares (including the final square), must be vacant except for the king and rook.
Alle felter mellem kongens start- og slutfelt (inkl. det sidste), og alle felter mellem tårnets start- og slutfelt (inkl. det sidste) skal være tomme (undtaget kongen og rokade-tårnet).