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In Puerto Rico, a player is required to ship as many of one good as they can in turn order.
If a player has a wharf, goods available to ship, and is otherwise unable to ship goods on the available ships, is that player required to use their wharf to ship all of one of their remaining goods? Or are they allowed to, say, hang on to their coffee to sell during a later trader phase?
No,
Using the Wharf is optional, and a player is not required to use it each turn. Here are a couple quotes from the rules.
A player is not required to use the special function of an occupied violet building if he does not want to (important with the wharf, see below).
The wharf can only be used once per captain phase by its owner, but he may choose when to use it, if at all.
