The chess tag wiki currently states, "This tag is for challenges related to chess or any derivative of it." This wording technically excludes games like Xiangqi (aka "Chinese chess"), which are part of the same family but aren't derivatives (more like cousins). If we're going to include fairy chess in the tag (e.g.), should we also include games that developed separately from European chess but share a common ancestor?
Update: The tag wiki has now been edited.