I get redirected to a web hosting company - a different company depending on the country I connect from.

The article appears to be from "Scientific American", volume 252, issue 2, February 1985, pp. 18-21, about Rog-o-Matic ( http://en.wikipedia.org/wiki/Rog-O-Matic ).

If so, http://www.cs.princeton.edu/~appel/papers/rogomatic.html is a different article on the same system.

Thanks! Funny, I get the same error now. Probably having something to do with the sudden traffic spike (albeit infinitesimal)

That was the article that made my know Rogue!

Here's an archive http://archive.today/vqdTN

As an avid Nethack player, it looks to me like the answer to the puzzle is to go around the purple worm. Angband players call it "pillar dancing."

PDF directly from the Scientific American archives http://www.nature.com/scientificamerican/journal/v252/n2/pdf...

Thanks! Url changed from http://science-fiction.fch.ir/rogue/doc/An_expert_system_out....