"The Dreaded Ace"?

[Guthrie]

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You simply cannot fold your PP every time an A shows up. That would be bad poker. Like others have said, this is very situational dependent. But here's a general rule to go by. Put out a probe bet. Chances are, if your opponent doesn't have an A, it will scare him and he will fold. If he calls or reraises, then you know to proceed cautiously.

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I've found probe bets to be useless at the micro limits. All donks play all aces all the time, so if you have four opponents on the flop, at least one of them has an ace. If you put out a probe bet, the donks with a weak ace won't raise, they'll call, and call, and call. Every time.

Some of the ones who don't have an ace are likely to call as well, since they have no fear of the ace, and fully expect to make their gutshot on the river.