[Harv72b]

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I usually vomit with rage here.

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FYP.

Seriously...this is a seriously tough position to be in. Given your passive read on Button, you can probably safely fold if he raises your river bet (probably with a 2 rather than an ace), and if you bet, CO raises, and Button calls 2 then you have a big enough pot to consider the overcall (especially given his quality of play, as him calling two on the river hardly means he must have an ace). It only gets tricky if CO raises and Button then folds, but again, you're looking at a pot of over 10 BBs.

I've never played on Pokerroom, but FWIW I don't remember seeing very many river bluff raises on Party 2/4.