Congratulations to SoSG readers ubragg, golem, drewdez (and fanerman, who commented but didn't contribute) on successfully and collaboratively solving P&A Magazine issue #22! I got the email from the editor this morning, our submitted answer was correct!
I've taken down the open thread we used to solve for now; I think I'm convinced now (as ubragg had politely suggested all along) that we should solve in private. Ubragg, drewdez, golem, and fanerman: please make sure I've got your emails and I'll figure out how to send you our work.
Nice job, guys...more news to follow!