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really? the PF betting is reopened behind you, i dont like the defend there. maybe i'm missing something?

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I'm not sure what you mean, maybe the terminology is confusing me, but do you mean we should bet the turn? Well, it would not be a disaster, especially not if everybode calls, in that case it's quite nice with a bet. But if a couple of them folds and the button raises or something like that, your bet was not for value. If the river is a 4 or a 9, hero will definitely win. Otherwise he will lose. To me, a check/call is obvious, and I'm quite sure somebody will bet that turn. The odds against making the straight is 4.88-to-1.