Should you bet top pair for value on the river against one opponenet?
Say you have top pair top kicker, pair of aces with a king kicker and your at the river against a single opponent and the pot is a decent size, not huge, but not a tiny pot. There has been some betting on the flop or turn. There is a possible straight, but you are sure from his betting that he doesn't have the straight. He could have you beat if he has two pair or trips though. Should you try to check your one pair down, or bet for value? Often times I just check, but realize if I made a smallish half pot bet, he would have called with middle pair, or top pair with a weaker kicker. But sometimes, he checks first, and I bet after him, but he calls with bottom two pair to win the pot, and I would have saved a bet by checking it down.
Is there any good rule to follow about betting/checking one pair on the river?