[Alobar]

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I I was hoping it would make the PFR think everyone had nothing, so he would bet again on the river, which I could raise, and trap everyone for a big bet.

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After the PFR gives up and checks the turn, youve got to assume no one has a real hand either, as they now dont bet. So assuming the PFR will then bet the river AND everyone will call, AND (this is the important part) call your raise is doing way to much assuming.