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Why do people want to raise this flop? To save 1SB in getting to showdown?

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i said raise or fold read dependent. against most vils i would fold it at this point

against a more maniacal vil, raising the flop can accomplish a few things:
1) cheaper showdown
2) free card
3) chance to fold them if they dont have an ace
4) better knowledge if SB 3bets the flop we can peel and fold the turn ui, or if he calls and leads the turn we can safely fold ui