Abstracting vehicle combat.

[Phantasm]

A few things about TIE Fighter vs Star Destroyer combat that should be noted, IMO:

1) TIEs, X-Wings, B5 Star Furies, etc. are small and maneuverable enough to evade mounted guns/turrets. While this part can be the Hnd bonus on SM +4 to SM +6 craft being added to their Dodge scores, the ability to score a hit on an SM +4 starfighter from an SM +18 (1 mile long) Star Destroyer can possibly be treated as a -14 to hit from the SM differential.

2) Small craft aren't normally targeting the Main Body of a ship; they're commonly targeting vulnerable systems: deflector screen emitters, engines, the bridge, hangar bays. This means they're not attacking the larger ship's incredibly high dST/dHP (3,000 dHP average for an SM +18 ship, using Spaceships's progresssion). The Death Star Trench Run was "evade the point defense guns designed to hit targets ten times your size, target a vulnerable location, and make sure the enemy doesn't shoot up your rear tail pipe with fighters of their own before you can get your shot off."

3. One common tactic in movies is to fly into a hangar bay and start shooting, bypassing the DR. (This makes sense against carriers, as it renders them unable to launch ships of their own; oBSG had Cylons doing this A LOT. Pretty sure they got it from the Japanese who ran their fighters into American flight decks during the Pacific campaign in WWII.) Ships under construction (*coughdeathstartwocough*) can let you fly into the superstructure, bypassing armor. Combine this with #2, above, and you end up flying into a ship to target a vulnerable location that lacks DR - like a reactor system.

Suffice to say, flying TIEs against capital ships takes a bit of strategy, not just "swarm and whittle down".