◆ The Codex · 10 of 16
Moving goalposts
Raising the standard of proof after each demand is met.
Also known as
Shifting the goalpostsRaising the barMoving the target
The shape of the move
Prove X with E. (E is provided.) That's not enough — prove it with E2 instead.
What is the moving goalposts fallacy?
Moving the goalposts means changing what counts as winning after the other side has already met the original standard. Each satisfied demand is quietly replaced with a tougher one, so the argument can never be won.
It's a sign the person has decided the conclusion in advance and is adjusting the evidence bar to protect it.
Examples
Science
“'Show me one study.' … 'Fine, but that's just one study. I meant ten.'”
Why it fails: The standard changed once it was met.
Workplace
“You hit your sales target, but you should have exceeded it.”
Why it fails: The goal was set, met, then raised.
In a debate
“OK, you proved it worked in India — but that doesn't mean it would work in Europe.”
Why it fails: New conditions are invented after the evidence arrives.
Why it feels convincing
Each new demand sounds reasonable in isolation. The audience doesn't notice that the earlier demand was met and then dropped.
Spot it: Every satisfied demand quietly becomes 'not enough'.
In the arena
If you’re about to commit it
- Set your standard of proof early and stick to it.
- If evidence meets your bar, concede the point and argue elsewhere.
- If you need a higher bar, explain why it was always necessary.
Instead of
“That study is only from one country, so it doesn't count.”
Try
“That study is strong evidence for India. My point is narrower: urban and rural results differed, so we should test rural pilots first.”
If your opponent commits it
- Remind everyone of the original standard.
- Show that you met it.
- Ask them to commit to a final standard.
Say this
“You asked for X and I showed X. What would actually change your mind — and will it stay fixed this time?”
When it’s not a fallacy
Raising a new, relevant objection is fine if it's genuinely different — not just a higher version of the same demand. New information can also legitimately change what counts as proof.
How the Oracle scores it
In an Arguen match, every argument is scored out of 80 across Clarity, Evidence, Logic and Rebuttal. If the Oracle detects a moving goalposts, it subtracts a penalty and puts the fallacy on your scorecard with the exact quote and a one-sentence explanation — so you see precisely where the chain snapped.
Frequently asked questions
What's another name for moving the goalposts?
Shifting the goalposts or raising the bar.
How do I stop someone from moving the goalposts?
Agree on what would count as proof BEFORE presenting evidence, so the standard is fixed.