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I play it the same. Effective odds are 8.75:2, so we need to win the hand approximately 25% of the time. I think he is often semi-bluffing this turn (a 7, or pair of 8's, 55, etc) and we catch the gutshot every so often as well.

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I liked your response to "ATo in BB: and I just kept calling " and I agreed with you.

Why is raising / (folding/calling for improvement) not better than just calling here?

Is the reason simply because we will get 3-bet more often than we are ahead?