As defined earlier supply centers are provinces with a black dot in them.
Their ownership is determined using the two rules listed in the slide. Note
that since a unit must be in a supply center at the end of a fall turn to take
control of it, it is possible to enter a supply center on a spring turn, exit
it on a fall turn, and never take control of it despite having passed through
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Copyright (c)2002 Ry4an Brase