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I love these range exercises! Given that this is a bubble spot and we have the chip lead, even with the deep button I might personally be raising a wider range here, but let’s proceed with the range described, as it is an excellent value range that we will be working with in many other examples as well I’m sure.
So much of this process comes down to the content of our assumptions –@ARW maybe you could provide some example ranges that you think those different positions might express through a 3bet? In a vacuum the Button is the only player we should be particularly concerned about from an ICM point of view, and imo the Cutoff and the SB should be very tight here by stack size, they have no incentive to mix it up with the big stacks at the moment. The open sizing is consistent or maybe a little large for the average stack size at the table, but definitely large enough that the other players and particularly the shorter stacks shouldn’t be targeting it recklessly despite your consecutive opens. How well do we know they players? The linear or polarized nature of their 3bet range is typically one of the main factors I look at when constructing ranges to defend against 3bets.