For 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 StauntonAfter black's reply to 1.e4 with 1..e5, leaves him always trying to get into the game
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 StauntonIt is the duty of the Umpire to determine all questions submitted to him according to these laws, when they apply, and according to his best judgment when they do not apply.
Howard Staunton