Here we go: A treaties game is one in which you have to declare treaties on Global, and also must declare war on Global a full phase ahead. This means that if you declare war in the Fall phase, you cannot attack until the Spring phase. Declarations made during the retreat phase or build phase count as being the following phase.
Also, if you announce a DMZ, and the other nation violates this DMZ, you have the right to instantly declare war.
examples: France declares war on Germany in Spring 1901. In Fall 1902, France moves to Munich and captures it.
France retreats to burgundy in fall 1902, England Declares war on France, In Spring 1903, England cannot engage in moves or supports against France. In Fall 1903, England supports move to Brest from Picardy.
A link to an old thread is http://www.vdiplomacy.com/forum.php?
threadID=3952