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I agree you should raise the turn not the river (that's assuming you actually want to try and take the pot from him.. i'd probably just fold the flop) Waiting till the river a) looks like a busted draw trying to grab at the pot b) might actually give him the cards he needs to call you.

You thought he was weak on the turn, so raise the turn.


edit: what hand were you representign? A way too overplayed AQ? If he had more than a complete bluff i think he'd be right to call you

edit edit:
But a raise on the turn could represent a set well, or an overpair.