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Well what do you do if he bets the river? Say, 500?

If you plan on calling, you might as well bet some sort of amount yourself, as he might call with a weak ace or weaker two pair.

Obviously if you bet and get raised, it is pretty safe to
fold unless villain is a total maniac.

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I think this gets to the heart of this issue. If you think he'd bet without a Q after you check, I think you should blocking bet an amount that you feel he won't raise without a Q. It's read dependent in that way.