[Taqwus]

Of course, whether or not engine-killers are a good idea also depends on his degree of support (namely, repair ships -- and possibly resupply? I don't recall what happens to supply with a destroyed engine), and how much damage you can inflict before the fleet is repaired. If you can't take advantage of the (quite possibly temporary) immobilization / slowing down, engine-killers won't be a good idea.

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-- The thing that goes bump in the night