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310. These descriptions can be combined, such that the turn is always in one of these four states:

310.1. Neutral Open: There is no Showdown in progress and no Chain exists.
310.2. Neutral Closed: There is no Showdown in progress and a Chain exists.
310.3. Showdown Open: A Showdown is in progress and no Chain exists.
310.4. Showdown Closed: A Showdown is in progress and a Chain exists.