If you represent an unlimited range (meaning you call with all hands Axs, Kxs and connectors), the BTN must 3-bet with the strongest part of its range, since the opening comes from a very strong position that is UTG And your limp line of preflop, also contains very strong hands that are inducing IP and OOP raises for the blinds, so if you call from CO, you greatly reduce the BTN range and the blinds.
From another perspective and if you achieve isolation with the UTG hand opener, you need to have a 3-bet range in a high frequency against this player, since your blockers will lose a lot of value against the closed range, which has this position default.
The 6-max dynamics make a hand like AKs/o be almost always a 3-bet IP, when the opening comes from a more strong position. The only reason to call from CO is if we have a very solid reading that the BTN is a true maniac. But even in this scenario, I would consider 3-betting as well, as we want to remove the blinds and apply maximum pressure to UTG, so we can isolate ourselves with the maniac. Since we know that their 3-bet / 4-bet range is quite wide, in a significant sample of hands.
Well played the postflop. Sometimes we can also raise on this flop texture, since as we said at the beginning, a small percentage of the time, we want to induce raises with super strong hands, and now we have AA / KK played slow with a spade, and seek the fold of minor hands. This makes sense when our range of preflop calls is quite wide and if we have a more narrow range image when we are aggressive.
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