Additionally, ships are equipped with a tractor beam that allow them to push or pull on material objects, allowing complicated strategies of pushing or pulling on opposing ships to throw off their aim. For instance, a torpedo aimed at a ship that is expected to be "due left" after the movement phase could be avoided by the target by pushing the opposing ship a few locations down. The distance a ship can be pushed or pulled is a relative measure of the strength of the beam and the mass of the target. This means larger ships can spoil the aim of smaller torpedo boats using this method, while smaller ships are better off simply using their drives to move themselves. Another useful strategy is to use the tractor beam to quickly push fighters into range of their targets, at "speeds" their own engines could not achieve.