FT200 4-bet sees a flop

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I either 4 bet to like 100 which is showing I am committed

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Yeah and you prevent him from ever 5-bet shoving worse. Great strategy.

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How much of his range at 1/2 is 5 betting worse than AK? A very very small part of it. Four betting AK for half your stack or so is +EV for so many reasons. You have fold equity against hands like JJ and below and sometimes even QQ and below. If you 4 bet to 90+ with AK then you can do the same with AA, KK, and QQ yourself. You are so rarely a huge favorite with AK all in preflop to say making it 60>90+ because you get people to bluff raise at 1/2NL is completely wrong IMO. The value is in the folds you get from hands you would be flipping against as well as with the fact that there is dead money in the pot when you are basically in a coin flip situation, both of which are hugely +EV for you.