When is checking the river right?

[AlanBostick]

Who is first to act, you or your opponent?

If you are first to act, then the pot contains something like 5.75BB. If you bet, what do you expect your opponent to call you with? At the same time, your hand can beat a bluff. You are probably best of checking and (something like six times in seven, if you have no read) calling.

If you are last to act, your hand might be worth a bet, depending on your read. If you think the likelihood of his calling you and showing you a bare ace is better than 50%, you should bet. And in any event, having missed your six-out draw to an ace or king on the river, you should bluff-bet close to 2.5% of the time.