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above all else, she overbet shoves turn with the straight here and not necessarily with sets because what villains like this are primarily trying to achieve is to make it so that when the decision was made (meaning when they put all the money in), there was no way they could be wrong. it prevents them from being in the spot that they absolutely dread which is having to decide between two ****ty choices (shove or check) if a scare card comes. KT is vulnerable to both the flush and any board-pairing river. this gives her a HUGE incentive to just make her decision easy and get it all in on the turn. it solves all her problems. she's not interested in extracting max value. villains like this play based on a pain-avoidance strategy in spots like this.
This is a good post. I hadn't thought about it in these terms, but I'm familiar with pain-avoidance strategies in other LLSNL contexts. For example, a lot of players raise giant amounts with AK and TT/JJ preflop, because they hate it when they get a couple callers, flop badly and don't know what to do, so they play in a way which avoids being in those situations. Frankly, I think pain-avoidance advice is rampant on this forum as well. Very frequently see difficult spots replied to with stuff like "fold pre and you won't get into these spots", which is just a variant on the AK/TT/JJ behaviour described above.