Here are the official rules:
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Effective January 1, 1987, the two types of categories will be "Resident" and "Non-Resident".
In general, if the original intention, as of opening night, is that the production is developed, produced and contracted for Washington, D.C. and is intended to be presented only in the Washington area, it is then considered a resident production. All other productions will be considered non-resident.
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There are only 4 non-resident categories (and N2N was nominated in all four): Production, Leading Actor, Leading Actress, Supporting Performer.
I personally think that, according to that definition, N2N should have been considered to be a Resident Production, but obviously the Helen Hayes people disagree with me.
"What was the name of that cheese that I like?"
"you can't run away forever...but there's nothing wrong with getting a good head start"
"well I hope and I pray, that maybe someday, you'll walk in the room with my heart"