[Sykes]

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If you have quads sure shove, but villian could easily have a 2 here.

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What could possibly make you think a villain would have a 2 here?

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At the higher buyin levels ($55+) against good players, I'm torn on this play because most good players will fold a 4 here and you will only win against 3 hands if you get called (55-88)

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Why would a good player fold a 4, but call with 55? What's the difference?

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Just for the off chance that bad players shove a 4 in this instance?

Also, why is it unlikely that CO doesn't have a deuce here? Don't you limp with A2s in position with limper(s)?