An example is the Italian opening move of A Ven-Tri. It also can be combined with a Lepanto to get an extra army into the Balkans against a possible R-T combination. The only way to know for sure is to wait until the fall move. A skillful Italian player can keep this up for a couple of turns. But if he is and wants to keep it secret, this deceit may forestall an R-T, or at least keep it off balance for a couple of turns early in the game.
Forces are to be structured strategically, based on what is advantageous.
The meaning of this should be obvious. Each state has only limited resources. These are questions which should, but often do not, determine builds. Under what circumstances does Austria need to build a second fleet, especially early in the game. Because builds indicate so much about a state's intentions, they can also be used for deceit.