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Exactly as much as he is willing to call, and at least enough to make him call for more than 1/4 of the pot.

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I bet you get a lot of suckouts...Why would you bet to give him great odds on his flush if you can bet big and hope he is some dumb online gambler? I think you make way more money this way...I like to take the hand while im ahead. Thats the whole reason you raise preflop right? I get plenty of people calling huge bets with flush draws. I cant stand all of these players complaining about how guys can never let go of flushes and they always suckout...blah blah blah...stop giving the guy close odds, the average player calls at least 2/3 of the pot every time on the flop with a flush draw anyway.