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The advantage is that when you are winning, you not only get an extra bet in on the flop, but also prevent him from checking behind on the turn by keeping the pressure on.

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But what hands that hero's beating will call a flop 3 bet and turn bet? Not many, I think. The flop 3-bet probably saves someone on a bluff or overplayed 2d or 3d pair 1.5 BBs.

Also, I forgot to mention that 3-bettingthe flop (which will almost surely be called), increases the size of the pot, which makes it less of a mistake for an opponent to call with overs.

I'm thinking more and more that the passive approach is far superior in these situations and that 3-betting is a pretty big mistake most of the time. I'm not trying to be difficult, I'm just trying to understand why so many around here think the flop 3-bet is the way to go.