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Big pairs play well against many or few opponents.
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That's certainly true of
AA, but less so as you go down the food chain. My understanding: "conventional wisdom" says one reason to raise with
KK or
QQ is to avoid losing to ace-bad kicker who might limp in and catch an ace on the flop.
At micros Axo is going to cold call two bets anyway, so thinning the field is less realistic. You're mostly just raising for value with the best hand preflop, and changing Axo to draw at a
dominated three-out hand.