Thus, a small ship may attempt to wrest control of a common target from a larger starship per the 'tug of war' tractor duel discussed above. Tractors may be used against Missles, Fighter Groups and Mines. Tractor lock needs to be maintained each turn and another ship may attempt to wrest control or break lock on per the 'tug of war' rules above. I've opted not to require plotted tractor movement for playability. If you move a ship into a mine with a tractor beam then the mine explodes per the normal rules.
Ships can drag, push or shove mines into each other if they wish.
Missles can be held until their fuel runs out. Hmm, lots of good ideas. Using a tractor beam requires a dedicated fire con, which may not be used for anything else. Each level of screens the target has subtracts 2 from the tractor's strength. Tractor beams are activated during fire resolution phase, but the effects do not take place until the following movement phase.