Full ring game... I'm on the button, I get AKo. One limper ahead of me; I raise to 3xBB, SB folds, BB calls, and the limper folds. So we go to the flop heads up. BB has shown himself to be a pretty tight (but not passive) player, and a bit tricky (I've seen him check-raise a couple of times in the last hour).

The flop is KQJ rainbow. BB checks. I consider a standard bet for me (2/3 to full pot), but bet only half the pot this time. After a moment's hesitation BB check-raises me 4x my bet.

I folded... my thinking was that the board was way too dangerous; he could have easily flopped two pair or a set, possibly even a straight, and I'd be way behind.

Your thoughts, please.