This piece was given the additional power of Knight to differentiate it from the King. Besides, this makes a nice power piece. The King moves and captures like the Rook and Bishop. Castling can be accomplished by moving the King over one of the Rooks. The King will take the position of the Rook and the Rook will change one level.
All standard restrictions apply.
All spaces between the two pieces must be empty, unattacked and the two pieces cannot have been previously moved. It is only necessary to relocated the Queen if the player wishes to castle Queen's side. King's side can be castled on the first move. The object is to checkmate the opponent's King. If you notice, you can mate the King with just the Queen.