It looks like a new tag has been created for end-game, and it has been added to a bunch of existing questions about a variety of games. Is this a tag we want? In general I think we avoid these "meta-tags" that can't stand on their own, and I can't imagine anyone wanting to see all questions about end games regardless of the game involved. We do have an openings tag as well, but it hasn't been used in a year.
Related: