The normal rules of Diplomacy apply except where amended herein.
The Vassal variant makes use of the
Minor Power map, where each of the 12 minor powers is a dummy
owning a single supply center on the standard Diplomacy map.
The game starts in the Winter 1900 Adjustment phase. Each dummy
minor power builds a unit at random. The seven Great Powers may not
build; their units begin on the board as usual. Alternatively the
game starts in Spring 1901 Movement with no units built in the minor
power centers (the scramble). To accomplish this, include the following
when creating the game:
MORPH BEGIN SPRING 1901 MOVEMENT
Dummy powers become vassals
after being conquered.
Units can only be built in home centers. Note that dummy powers have
only their starting center as a home center.
Vassals was proposed by Joseph Wheeler and developed in discussion with Manus Hand.