I know alt.hackers had a similar rule, and even had a testbed group (alt.hackers.test?) you could use to see if you had figured it out without polluting the mai

I know alt.hackers had a similar rule, and even had a testbed group (alt.hackers.test?) you could use to see if you had figured it out without polluting the main feed with test posts. The FAQ hint was "it's moderated with no moderator". Everything else was up to you.