Each link on the chain is a one word answer, each a noun which, when joined with the previous word, forms a compound noun. That's the linguistics prof's rule, but way too technical an explanation.
In my opinion (and CBS' apparently) we never fully refined the format to where it needed to be. Why? Well, there are always politics and personalities ;-)
The different rounds we devised during development had different variations, such as bouncing between the teams to see if you could give one more acceptable answer from the same link. Just when you think they've all been used, you add one more:
Dog ____
dog house, dog pound, dog food....
It's definitely a drinking game; it drove me to drink!
Randy
tvrandywest.com