If, during the course of the game, it be discovered that any error or illegality has been committed in the moves of the pieces, the moves must be retraced, and the necessary correction made, without penalty.
Howard StauntonThe game of chess is the most fascinating and intellectual pastime which the wisdom of antiquity has bequeathed to us.
Howard StauntonFor playing a man to a square to which it cannot be legally moved, the adversary, at his option, may require him to move the man legally, or to move the King.
Howard Staunton