Join Date: Jul 2004
Posts: 40,336
This is a mandatory flop bet. You have no showdown value. Your flop check range should be unpaired hands with showdown value like AK, plus some bigger overpairs (bigger so that free cards are less problematic).
As played river should be a check fold, you don't really rep anything and your opponent is most likely to have a marginal made hand, with which he will call. Fold to the raise, while your opponent may be bluffing you're going to need to reraise to win the pot and it's too much to risk, he could just have flopped top set or whatever.