Quote Originally Posted by ArcadianRock
I just don't think that PF AA is going to come up often enough against KK (it does happen still...) that it's profitable to fold it after a 4-bet, you could flat call it but if an A comes up it puts you in a WA/WB situation.
It isn't a matter of how often AA comes up preflop. Villain has pretty much turned his cards up - at least narrowed his range very, very significantly by 4-betting us, so AA makes up a big part of that range. How often AA shows up now in this situation is the fact that needs to be considered.

By carelessly shoving our deep stack in preflop we may only be getting called with AA. By not jamming an insane amount of bb's into the pot preflop we still allow weaker hands in villains range to come for the ride. Given the 4-bet out of someone who doesn't really raise preflop to begin with is a strong indicator that his 4-bet range is the near nuts here. By being so eager to get KK all-in preflop after facing a 4-bet from someone who just doesn't raise, we're essentially turning KK into a bluff (repping aces). Some of you may disagree, but I don't think pushing into a player who rarely raises preflop after he's 4-bet you is a good idea unless you have the nuts.

If an ace comes on the flop I don't think it changes the fact that we're either WA or WB. It'll just make it a bit more obvious once we see the line villain takes in repsonse to that sort of flop. If villain shows he's fearing the ace, we may be able to take him off KK and win a pot we're otherwise chopping. If flop comes QQx or JJx, depending on the villain (although I doubt anyone has learned how to fold AA at 2nl yet) you may be able to bluff him off his hand. Certainly not this guy of course, but for other scenerios when facing a super-tight raiser it's definately a possibility.