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The king and rook should try to keep the knight and king as far apart as possible, while still keeping control of the key squares. If the knight and king are far apart, it becomes much more difficult for the knight to defend the king.
The king and rook should also try to control the squares that the knight and king need to move to in order to be able to defend each other. This can be achieved by putting the rook on squares that the knight and king need to move to, or by putting the king on squares that the knight and king need to move to in order to be able to defend each other.
In addition to this, the king and rook should try to use the rook to check the knight and king, in order to force them to move. This can be achieved by putting the rook on a square that the knight or king needs to move to in order to be able to defend each other.
In summary, keeping the knight close to the king is the best policy, while trying to keep the knight and king as far apart as possible. The king and rook should try to control the key squares and use the rook to check the knight and king, in order to force them to move.