**Moving the goalposts** is a logical fallacy that takes the following form.

- 1st person, "Prove A to me!"
- 2nd person, "This proves A."
- 1st person, "That's not good enough, you've got to prove B as well!"
- 2nd person, "This proves B."
- 1st person, "That's not good enough, you've got to prove C as well!"
- 2nd person, "This proves C."
- 1st person, "That's not good enough, you've got to prove D E & F as well!"

And so it goes on, however much you prove if your opponent keeps moving the goalposts there's always more you haven't proved yet.

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