One thing to add - this last part of your explanation is incorrect. The whole point is that NO MATTER WHAT, you are pushing in first to act on the next street (afer the flop, in your example). You can't chicken out if a King falls.
In fact, sometimes, like when your opponent is holding QQ in the scenario you described (since you don't know he's got AK), that King falling will win you to pot - you push with JJ and he folds his QQ, thinking YOU are holding AK.
|