According to the rules if the line of sight is obstructed, you have to give up one dice from your attack pool. In my last game my opponent cleverly placed Rhymer and another fellow TIE/B on an asteroids obstacle and was happily firing on my CR90. As the CR90 has only one anti-fighter dice we both interpreted the rules that I can not fire on the fighters - because my attack is obstructed - but they can attack my corvette.

Thinking about it now that would mean that the bombers shouldn't be able to fire on me either because of obstruction... Am I right or not?

As an afterthought, same setup but instead of Rhymer it's Boba Fett. That would mean that the CR90 still can't fire but Fett can fire with one of his anti-ship dices, right?

And another question:

If you fire on squadrons and you use a Concentrate Fire dial, that mean that you can roll on every squadron within your arc with an extra dice, or only on the first one?

Yeah they have to subtract a die each when they fire on you, since every squadron is a separate attack. So rhymer and his buddy cannot attack while on an asteroid, but a firespray or b wing or scurg could because they'd only go down to 1 die.

Concentrate fire only works on one attack against one squadron. Use it if you must, but it's usually better thrown at a ship.

Actually I like to think of concentrate fire as the command you take when you don't need anything else - an extra die because your opponent didn't pressure you into engineering/navigate, and your squadrons are doing fine by themselves.

Concentrate fire doesnt let you shoot obstructed targets either.

Many get confused by that concept.

You take away dice from your that arcs dice pool, then add it for concentrated fire. Really sucks for CR90's

See the light, jainas light