There are a variety of different rule systems to define play.

It contains information on character creation and the basic rules system.

George remains skeptical, even after Jerry explains the rules system to him.

This does not mean that social rule systems do not change.

Other rules systems do not allow this - the ten count continues even after the round ends.

Each rule system emulates the next one in the sequence.

The various rule systems differ predominantly regarding the number of touches each team may have.

It would be interesting to build a simulation model with different rule systems governing the market for certain knowledge intensive products.

It employs an innovative rules system eliminating the need for a ruler.

Because of the disparate authors, the rules systems were mutually incompatible.