Paul Strack
First Post
You're entirely correct, and I'm not disputing that this is how it would work. I'm just saying that trying to codify it into two "levels" of Stealth and assigning requirements and rules to each one is about ten times more complex than stealth needs to be. If you're hidden from someone, that someone has to guess what square you're in to hit you. If someone else tells him what square you're in, his guess is pretty much guaranteed to be right--but he still can't see you, and so you still have CA against him and he still takes penalties to hit you. That's all you need.
All right, since you seem to have accepted that, let me ask the following question:
1) Do you need cover or concealment from all enemies in order to be able to hide?
My answer differs depending on the level of benefits you wanted to get.
To gain TWYCS, I would say yes, you need cover or concealment against every enemy, otherwise the one against which you are not concealed can reveal your location as a free action.
To gain a Combat Advantage, I would say no, you only need cover or concealment against the target of your attack.
I think both answers agree with the RAW.
If you accept that, it gives you many situations where you can get a combat advantage without getting TWYCS, and it may be worth discussing whether there are other conditions that grant combat advantage but not TWYCS.