[soah]

The weak-tight part of me thinks that this is exactly how a bad player would play pocket aces. But if he's bad enough to play AA like that, then he may also be bad enough to play AJ like that. Or he may even be a dumbass with JJ. It's basically impossible to figure out what he has, because there are no two cards which should ever logically be played that way.

We can use a few rules of thumb... such as, a check-raise on the river is not a bluff. And when actions later in the hand contradict actions earlier in the hand, the latter action is more likely to truly represent the strength of someone's hand. So we know that he probably has a really good hand, it's just a question of whether it's good enough to beat a set of sevens. If the raise on the river were smaller I'd just call and pray, but with the actual stack sizes I'd be pulling my hair out.