AA 20 BB pot

[gaming_mouse]

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I mean you really think KK or worse decides to raise the river AFTER the flush came in AND the decided not to raise the turn.

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Yes, I do think it's possible. Bad LAGs love to raise the river on scare cards, and that river card is a scare card. I really don't see why you think a bluff raise is so unlikely here. This is not the place for a bet/fold, IMO, and I'm a fan of the bet/fold.