Moving the goalposts
Moving the goalposts (or shifting the goalposts) is a metaphor, derived from goal-based sports, that means to change the criterion (goal) of a process or competition while still in progress, in such a way that the new goal offers one side an intentional advantage or disadvantage.
This phrase is British in origin and derives from sports that use goalposts. The figurative use alludes to the perceived unfairness in changing the goal one is trying to achieve after the process one is engaged in (e.g. a game of football) has already started.
Moving the goalposts is an informal fallacy in which evidence presented in response to a specific claim is dismissed and some other (often greater) evidence is demanded. That is, after an attempt has been made to score a goal, the goalposts are moved to exclude the attempt. The problem with changing the rules of the game is that the meaning of the end result is changed, too.
Some include this metaphor as description of the tactics of harassment. In such cases, a re-defining of another's goals may in reality be intentionally devised so as to assure that an athlete, for example, will ultimately never be able to finally achieve the ever shifting goals.
Moving the goalposts may also refer to feature creep, in which the completion of a product like software is not acknowledged because an evolving list of required features changes over time, which in extreme cases may even require rewriting the entire program. Thus, the goal of "completing" the product for a client may never occur.
The term is often used in business to imply bad faith on the part of those setting goals for others to meet, by arbitrarily making additional demands just as the initial ones are about to be met. Accusations of this form of abuse tend to occur when there are unstated assumptions that are obvious to one party but not to another.
Karl Popper coined the concept conventionalist twist or conventionalist stratagem in Conjectures and Refutations with similar use with this fallacy but in the context of the falsifiability of certain scientific theories.
In 2009, Danish association football goalkeeper Kim Christensen was caught on camera moving the goalposts in order to gain advantage over the opposing team. Christensen's moving the goalposts was discovered by a referee about 20 minutes into the game, but Christensen did not suffer a suspension or any fines for his actions.
Deliberately moving the goalposts constitutes a professional foul in rugby football and an unfair act in gridiron football. The officials are granted carte blanche to assess whatever penalty they see fit, including awarding the score for any attempt at a goal missed or invalidating any goal scored as a result of the moved goalposts. In both rugby and gridiron, goalposts are anchored into the ground; the distance they can be moved (most easily in gridiron by pulling down on one end of the crossbar to tilt the posts one way or another) is far more constricted. One situation in which a gridiron football post can be inadvertently warped out of place is during a touchdown celebration; it was once a fad among National Football League players in the early 2000s to shoot the football, basketball-style, over the crossbar like a layup. Because of the risk of the goalposts being warped out of shape, using the goalpost as a prop is a 15-yard penalty for excessive celebration.
Moving goalposts is common in ice hockey, where physical contact with the posts is common. If the goalposts are knocked off their moorings in the course of play, play is stopped until the goal is put back in place. If the goalposts are deliberately moved to stop an opponent from scoring, the opponent may be granted a penalty shot; if the goaltender does so, the goaltender may be ejected from the game (a rule imposed at most levels of the game in 2014 after David Leggio deliberately moved the goalposts during a two-person breakaway, believing he would have a better chance of stopping a penalty shot). Leggio later used the tactic in the Deutsche Eishockey Liga, where he has played since 2015; that league had not yet outlawed the maneuver. but promptly did so after Leggio's first attempt at using the tactic. The DEL instead automatically awards the goal to the opposing team.
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- The dictionary definition of move the goal posts at Wiktionary