This is a move of the king and either rook of the same colour on the same rank, counting as a single move of the king and executed as follows: the king is transferred from its original square two squares towards the rook, then that rook is transferred to the square the king has just crossed.
Lesi yisinyathelo esenziwe nenkosi nenye yama-rook, anombala ofanayo emgqeni wokuqala womdlali, kuthathwa njengenkosi eyodwa enyakazayo futhi kwenziwa kanjena: inkosi idluliswa isuswa endlini yayo yokuqala izindlu ezimbili zibheke embhoshongweni osendlini yakhe yasekuqaleni, khona-ke umbhoshongo udluliselwa endlini inkosi esanda kuwela kuyo.