Calling down with J8 unimproved.

[pzhon]

I had J8s in the SB, I open-completed, and the BB raised. I called down unimproved, and won.

The BB was overly aggressive, and would almost always bet if I checked to him (and would raise if I just completed the SB). Bluffing did not seem to be a profitable option.

What's the most favorable board for calling on the river with J8 unimproved, where both cards play? Where only the jack plays? What are some borderline situations, assuming I'm getting 6:1 on the river? What's the worst possible board?