Your failed your proof roll.
You can fail a stealth check. You can step on a twig and make noise. You can wear bright orange while attempting to hide in a white room. If you roll so poorly that there is no roll to see you, it's automatic, you've failed. That's the easy example that overcomes your proof.
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Sorry nope. You absolutely cannot fail a stealth check. I can roll so poorly that observers can easily spot me but that doesn’t mean I failed to stealth. I just didn’t stealth very well.
But it is not possible to fail.
The more complicated on is that in an opposed check the roll of your opponent is the DC for success, so it doesn't matter if you haven't stopped wrestling. You've failed to successfully wrestle against your opponent who just pinned you.
And of course your proof is a Strawman, as
@iserith did not specify opposed checks. He said ability checks, which of course leads to the next fallacy in that argument of yours which I'm too tired to remember the name of. You're starting off trying to disprove ability checks in general and then use specifically opposed checks to do so. That proof will automatically fail on its face since it's conflating ideas.
Yes. Those conditions are called house rules.
A contest isn’t a skill check? That’s an interesting notion. Your stealth check sets the dc for perception. You don’t stop arm wrestling because you rolled lower than the other guy.
But yeah it’s just going to be blown off. It’s impossible for a method to have any flaws apparently.
Aw well at least I tried. You folks have fun.
Btw how is a forgery check not am opposed check? Isn’t it actually listed as an example of an opposed check?