[Spicymoose]

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I'm not sure I see the point of the screw play here. Is this for value or to get a better hand to fold?

If villain has some kind of mediocre pair, I think that screw play might get him to check the river, but probably not fold the hand.

If villain has as worse Ace, isn't it better just to lead the turn and, perhaps the river also?

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If villain has a PP, he may fold on the turn, but it isn't all that likely. The times he does is great though. Lots of times we extract an extra BB from overcards who would have folded to our turn bet. Occasionally we might even get high cards to call our check raise, and then bluff us at the river.