[ahecht]

While a holonomic drive system will be more pushable than a traditional 4-solid wheel system, it is still harder to push than a robot using all onmi-wheels. In general, a four wheel holonomic drive system will have the equivalent of two wheels that roll freely and two wheels that are resisting the motion. But, as Andrew said above me, a holonomic drive system can outmanuever just about anything, so it should be able to go around a robot trying to push it. The only trouble would come in a game where two robots are trying to control the same movable goal (zone zeal, for example).