[Nikademus]

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As for the other question, so is it safe to say that if I limp in and get raised, I should pretty much always call (at least) unless it comes 3 bets to me?

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This is pretty much the mantra of the micro-limit player. It's downright rare to see anyone fold to a raise once they've limped in. Note that you can use this to your advantage in late position, when you have a hand that will rely on pot odds. Example, T9s on the button with 5 limpers, I'd raise just for better odds later. Those 5 limpers *WILL* call the raise.

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If it does get raised and re-raised behind me, should I ever just call? Or should I only play hands worthy of capping?

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3-bets back to you, you can consider folding (in fact I recommend it.) Let me ask you, what hand would you call 3 bets with that you wouldn't raise to begin with?