The problem is, Gray Lensman, is that you are misinterpreting the quote. It doesn't mean 100 400dt SDB's can defeat an 80,000 dt starship, they can individually beat a starship up to twice their size, in this case, for the 400dt example, they should be able to fight and beat an 800dt starship. Try designing an 800dt warship and fighting an individual 400dt SDB, or design a large warship, and a half-size SDB, and fight it out...