[trickymartin]

Why does he lead out on river?
I think these are possibilities:

1. T helped him
You have 2 T's yourself, so it's unlikely that T made him
two pair on river. If he has lower set or he had 2 pair on turn, he would have raised you on turn. I think it is likely that river card made him straight with 6 or jack.

2. Diamond made him flush

3. He is trying to bluff you

4. He is donkbetting pair of aces

If you raise, bluff will fold and better hands often 3-bet. I don't think he has 2 pair or pair of aces often enough to raise.

I can't see any reason to raise, just call. And I don't think you can semi-bluff on river. [img]/images/graemlins/grin.gif[/img]