Everyone is full stacked. CO is extremeley weak/tight, running at 42/2 over about 300 hands. Tain network. Never seen BB before.

1. I am dealt [5d] on the button. CO limps, I raise to $5, BB calls and CO folds.

2. Pot $11.50, flop comes [Qd][9d]. BB leads $5, I raise to $20, BB calls.

3. Pot is $51, turn comes . Check/check.

4. Pot is $51, river comes . BB checks. Obviously I lose if I check behind, if there any value in bluffing this river to try to a draw to fold? If so how much?

Also does a weak lead then a call make the fact that he has AJ or a diamond draw more likely?

I put him on something like KJ. I think i wouldve just called his flop bet.

I like a flop raise here, though I wouln't bluff river. I've seen people making such river calls with A high, so it is not a good idea IMO.

Depends on your image. Have you been raising a lot with the button? I found the Tain folks get very suspicious very quickly once you've done that, and will call you down with top pair all day and all night.

So this is what I do. I unclick "auto muck" and then check behind, and show my cards so that everybody can see the crap I raised with. Next time I raise OTB and catch a real hand, I bet all streets and bust somebody.