[hgibbs]

Implicit in a range like this one is that you are facing 'maximally exploitative opponents'. Since the game is zero-sum, over enough games the expected value of such a strategy is 0. However, since that expected value is against a maximally exploitative opponent any deviations of the opponent's strategy lead to an increase in your expected value. This is the game theory approach (GTO).

On the other hand, you can try to tailor your strategy to be maximally exploitative of the other players at the table, but doing this can be hard since often it can take a large number of hands to gauge what kind of player somebody is. On the other hand, GTO strategies are naive in the sense that you don't need to know anything about your opponents to guarantee that you Breakeven.