folding a hand preflop after it is raised

[droolie]

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So are you saying you should be raising with hands like 8/9s or 5/5 ?

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Absolutely raise or fold unless you have incredibly loose players behind you in which case you should seriously consider changing seats.

Never open limp with A-rag. The only time those hands are playable is for raises to either to steal tight blinds in LP or isolate a loose fish from LP or to make a stand vs a weak tight SB or button stealer in which case you should 3-bet and plan on betting the flop. A-rag is a tough hand to play correctly so avoid it altogether until you are more experienced with exploiting player specific weaknesses.