[Jeff W]

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i could be wrong about this, but if youre going to never 3bet out of position it is to conceal the strength of your hand so that you win alot of bets postflop.

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I follow dreamclown's strategy to a tee(always call in the BB and always check the flop to the PFR).

I think the basic theoretical reason it is effective is that you reduce the amount of information your opponent has and play for smaller pots when you're out of position. You are therefore counteracting his basic position advantage.

IMO, 3-betting HU OOP from the BB is an exploitative play--not "optimal" as in unexploitable--both in HU matches and in ring games. Same for donkbetting into the pfr HU.