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 StauntonFor touching an adversary's man, when it cannot be captured, the offender must move his King.
Howard StauntonA player is said to have the opposition when he can place his King directly in front of the adverse King, with only one square between them. This is often an important advantage in ending games.
Howard Staunton