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The probelem also is that if I do lead out and bet, most opponents( I think) would be asking themselves. What is the chance of me potting preflop and then actually having a jack in my hand when the flop comes. They have a great stealing opportunity. I bet half pot, they double that bet, and now what?

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Raise again! When you lay down the best hand, it should only be due to the fact that you incorrectly believe that you are beat.