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Most of it's pretty obvious, I think. Like when there's a really short stack on the bubble and you're second or third stack, you should tighten up, and stuff. But, there's a big difference between knowing this stuff qualitatively and knowing it near-exactly.

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Yes, there are many hands that are easy pushes or easy folds. But there is a whole range of hands in every situation that is close, and you really need a good understanding/'training' in ICM before you can get it right each time.