One thing I realized when adding a tag to an article is that the various 'defenses' could also be spelled 'defences', depending on the locale.
Eventually what I see happening is multiple tags appearing for the same defense, such as 'sicilian-defense' and 'sicilian-defence'.
Is there a convention that is preferred for the tags? should one be set?
Wikipedia does not set a convention other than the usage should be consistent within an article.