Capping the river vs a three-bet

[DavidC]

Could someone please tell me when I should be raising the river in position and then calling vs a three-bet?

--Dave.

I understand that it's probably not a simple answer. Here's my thoughts so far:

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Because people who three-bet the river can count on being called almost all the time, it would make sense that people would commonly three-bet without the nuts, and that therefore you dont' have to have the nuts to cap it, since you'll almost always get called by any hand that three-bet. I'm not sure of the validity of this theory...


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Edit: to make things easier, let's start with the assumption that the river is to be played heads-up.