It's true that many questions about RPGs will be questions about rules. How should we use the rules
tag?
Prompted by this rules question. The “rules” tag was added because it's a question directly about the rules of a game. Another participant removed the tag. To avoid a tag-edit ping-pong, I'm bringing it to Meta to discuss.
So, what are examples of questions that should have the rules
tag, and perhaps more importantly, what are examples of questions that should not have the rules
tag even though they're close to the line?