Does MDF against 3-bets only apply to a polarized 3-bet range?

B

braun_kan

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I've read from The Grinders Manual that for villain's 3-bet bluff to work against us they need hero to fold some percentage of the time (required fold equity), i.e. if they 3x raise our 3bb open then their RFE is (9 / (9 + 3 + 1.5)) = 66%, then subtracting ~10% equity for the time their bluff hits the flop good then that means the RFE of their 3-bet bluff is 55% and therefore hero's MDF should be 45% to be unexploitable.

Does this only apply against an unexploitable and polarized range that a reg might use? This calculation makes sense to me if we are sure that villain is bluffing, but there is the chance they are at the top of their range or they are 3-betting with a linear range which confuses me.

If villain is 3-betting at an unexploitable frequency with a linear range then is defending with 45% of my range still correct?
 
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