Nice answer :)
It's a slightly more fun version of, e.g. having a computer program that asks you to enter correct answers and prints out pass/fail, so basically you answer the questions in secret and the challenger sees only the result, and believes that it was executed correctly ... which is pretty reasonable.
(not the intended answer of course; for that no mechanical or digital mechanisms needed).
So I thought about it more.
If no machines are allowed, can't we just craft 2 lists of questions whose answers add up, in total, to a certain number of letters. The same sum for both lists.
The expert reads the questions and gives the total. If the total is ok, he knows, if not, he doesn't?
Really interesting idea, I like it. Obviously difficult in practice, but the spirit of the idea makes sense, as long as the numbers get large enough.
Ok, I give up, ðŸ˜ðŸ˜ðŸ˜.
What's the answer ?
No, you succeeded I'd say, that last idea feels like a valid solution ... unless i missed something. I'll post the 'intended' answer later.
