This fella seemed to have the answer - Back in 1998 - Dunno
From: Gary Wachs - view profile Date: Fri, Jun 26 1998 12:00 am Email: "Gary Wachs"
Hello fellow electrical weenies,
In my pre-Dilbert days about a decade ago, I was an electrician.
There was this one little electrical wiring puzzle involving three-way switches that almost stumped me back then. It tooks a few days to figure it out.
It's still one of my favorites! Why? Because, to understand its significance, you have to learn a little bit about electrical wiring, as well as electrical code regulations. You may find it to be tricky, but the solution does exist. Although I worked with dozens of EE's and electricians, none have solved it.
I've developed a home page about it at
Give it a shot! Let me know what you think. Please don't post the solution if you get it. If you give up, I'll email you the answer.
By way of comparison, I would compare my 3-way switch problem to Tavern
Puzzles's "Sneaky Pete" puzzle; both were equally frustrating and satisfying when finally solved.