[Jeffage]

Define unknown - old, young, overall impression? Part of winning live poker is being able to size up strangers on the fly.

I think the flop is ok, but when you're raised on the turn I wouldn't automatically pay my opponent off. J10 is pretty plausible, as is a set of 4's or 6's. Unless you have reason to believe he's pretty loose aggro, you're likely tortured. A set makes a lot of sense and he doesn't expect you to fold after 3-betting the flop so what do you think he's trying to do exactly?

Then on the river, it's kind of gross - the only draw got there and he's still betting. That usually means he has a strong hand that he can't resist valuebetting and doesn't think you bet-3 bet with a flush draw. I agree w/ Snowball about betting being better if you MUST pay this off. But if I get to the river, particularly that river, I'm frequently check folding. I don't think I get there unless he's an action type though or he thinks I'm weak or something.

Jeff