I noticed there are currently tags like catan-cities-and-knights and dominion-alchemy, but also seafarers-of-catan and pegasus. Should expansion tags be prefixed with the core game name? If so, should it be catan-cities-and-knights or settlers-of-catan-cities-and-knights? The latter seems rather lengthy, but when would it be ok to abbreviate? Would catan-seafarers-of-catan be redundant?
I think we should have a single tag for the game and a tag for the expansion. Just like dealing with languages and versions on SO.
So you should have setlers-of-catan (or short catan) and seafarers, cities-and-nights, possibly even: expansion-seafarers and seafarers-cities-and-nights.
I think the question should be tagged with the common name of the expansion (like
seafarers-of-catan) and tagged with the name of the parent game (like
We shouldn't go out of the way to format the expansion's tag to include the parent game's name if that's not how people refer to it. If the game is called "Seafarers of Catan" I don't see a need to jam "Settlers of Catan" into the Seafarers tag.
I think there's more benefit than detriment to lean toward having the base game and expansion be in the same tag. Powerlord has pointed out that having multiple different games refer to the same tag unnecessarily links two different games. If I search for such a tag and find 1200 questions under it, I get no visibility into just how many questions pertain to it, whereas if we have one tag per game and one tag per game+expansion, it's immediately clear. The only downside I see is a long tag such as "arkham-horror-curse-of-the-dark-pharaoh" which is long but easily forgivable in exchange for the clarity, in my opinion. The only issue is the tag size limit prevents this (and I don't know how easy it is to appeal to have it lengthened).
Three tags: [game], [expansion] name and the tag "expansion".