[Harv72b]

This seems ridiculously standard?

EDIT: read the prior responses, guess not. Check/calling the flop is the correct move here--if we've got the only ace then we are way ahead in a small pot, so feel free to give the others a chance to catch up to a decent second-best hand. If someone else has an ace they probably have us outkicked, so no reason to bet into a possible raise. The turn call is also correct because SB may have a better (or equal) ace to ours, he may not have enough of a hand to call a raise should we make it (where he would call a river bet), and we'd like for MP to overcall. Easy bet when it's checked to us on the river.