20/40 stud hand

[electrical]

I think you can raise Fourth not knowing whether you have the best hand or not. It's very unlikely you'll get re-raised, and if you are forced out of position by pairing or catching an Ace, your hand will be strong enough to lead with. If you still have position on Fifth, you can decide from his reaction to the raise and action on Fifth if one pair is worth betting for value or if you want to take a card at a discount.

Having raised, you will likely take the pot on Fifth if you pair or catch a [img]/images/graemlins/heart.gif[/img], but he will probably pay off if you catch an offsuit Ace, which seems like a very good outcome.

Regarding the river I think you can raise, His hand didn't look like more than Jacks, and he may have bet the river defensively with one pair. You have the A[img]/images/graemlins/heart.gif[/img] so it would be tough for him to three-bet even with a flush.