NL50 & 100, KK becoming a routine fold to all-in preflop vs. unknown?

[GiantBuddha]

And this happens often?

You should catch KK vs. AA about once every 5300 hands. You shoud catch AA vs. KK about once every 5300 hands. This will tend to balance out. If you saved your entire stack every time you had KK vs. AA this would improve your winrate by almost .6BB. Of course, this is impossible, as you've usually already put some money in by the time you think someone has AA.

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3bet shove? You mean you're raising 3-4x the big blind, and they're shoving and showing up with AA?

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Anyway, this question is really about the ratio of shove with the nuts donkeys versus shove with ATC donkeys. I think we need a donkologist to answer this question properly.