[bones]

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My thought process throughout the hand is what is he calling with that he doesn't bet

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This is where his limp on the button comes in. This is about the most passive thing you can do in an sng. Even though the 109s are typically aggressive, there are some passive donks. TOP states that if your opponent will bet more hands than he'll call with, you should check to him more to induce bluffs. If he calls more hands than he'll bet, then you need to bet your hands for value.

It doesn't make sense to TAGs why someone would call more hands than they'd bet in a short stacked situation, but it's how some people play.