Re: KK preflop
A pot-size raise in the CO with KK should be fine.
When the shortstack pushes you obviously can't fold; I don't expect him to show AA too often and there is lots of money already in the pot. As for whether to call or reraise at that point it probably doesn't matter much. I think I'd push, but letting the BB choose to call off another $100 with something that's in really bad shape isn't going to cost you any EV.
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