In a computer adaptation of an existing game, the AI may have the ability to pull off moves which are against the rules of the game. Note that this does not include simple extra rules. For example, a Chess variant in which the queens can move as knights isn't cheating if applied consistently. However, if the AI's queen can move as a knight but the player's queen can't, then that's cheating. Compare My Rules Are Not Your Rules and The Computer Is a Cheating Bastard.