[Blarg]

Interesting point. My KK and QQ are getting slaughtered after moving from 1/2 on Party to 2/4, which is much looser and where a huge percentage of people play any Ace from any position, sometimes even for a raise and even cold-calling a raise to do it.

Obviously this kind of thing depends on the texture of the game you are in and is not a matter of a reliable, hard and fast rule. But generally, in my experience anyway in the 2/4 at Party, at least for the about 14,000 hands I've played it, you're right on the money -- if the flop has an ace in it, it's very likely that someone has just made a pair of aces.