[skp]

See my earlier post. I raised the same point although I do say that betting JJ might be worthwhile if the other guy can fold KK/QQ because of the ace on board.

But this principle (of checking JJ) can be carried over to other spots where it's unlikely that your opponent has a better hand which he will fold. For example, let's say that you raised in late position with JJ and are now headsup with someone in early position. The flop comes A22 rainbow and he checkcalls. In this spot, the rationale for checking KK on the turn applies equally (or nearly equally) to JJ as no rational player would havre called the flop bet with a King or a Queen unless it was AK or AQ. When he calls, his most likely hands are a pocket pair, a weak ace or a deuce. So, you should check JJ (but probably bet 55).