Pole arms with reach. Longspears, guisarmes, etc. Can you attack someone on the far side of an occupied square or hex? For example. I am A, armed with a longspear. My paladin buddy is B. My target is Goblin G.
X-X-X A-B-G X-X-X
X-X-G X-B-X A-X-X
X-X-G X-B-X X-A-X
Can I attack Goblin G in any of those circumstances? Does Goblin G gain cover against my attack? Would the situation change if B was another goblin and not friendly to me? Would the situation change if B was a bulky inanimate object such as a tree or a pillar of rock?
I've been allowing it with no penalty, mostly for simplicity's sake, in my game. I feel like standing behind your heavily armored buddy with a pike should be an effective tactic in D&D, since it was such an effective tactic in ancient Earth. But I'm starting to feel like the target should get a cover bonus. Anyone have any comments?