goal

an own goal (British)

something that someone does to try to get an advantage, but which makes a situation worse for them. The publishing industry believes that new regulations on recycling paper will be an environmental own goal. The government has scored an own goal with its harsh treatment of single parents.

move the goalposts (British, American & Australian, American)

to change the rules in a situation in a way that is not fair, usually in order to make it more difficult for someone to achieve something. My boss is never satisfied. Whenever I think I've done what he wants, he moves the goalposts.

See also: move