[Big_Jim]

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If pushing lets them off easy I guess your never bluffing here?

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Probably not often enough.

It's just that his hand looks like either a draw or a monster here.

You're in the BB and there's a 3 flush on the flop and a 4 straght on the turn in an unraised pot and you overbet the flop..... how often are you getting called by worse than the straight here, unless your image is GREAT?

Furthermore, how likely is the straight given that he needs a 5 to complete it, there are only 3 fives left in the deck, and he didn't raise you on the turn?