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Do you think you have the best hand, or are you trying to get a better hand to fold?

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Both. I think I have MP beat (if he just calls) and I'm hoping to fold a better hand from BB.

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You're not going to get many players to fold an AA or KK overpair too often.

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It doesn't have to work too often to have value.

EDIT: Add QQ to the list too.