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You move all-in here because you have the fourth best hand in poker and the raisers range is likely way behind your hand.

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I think the fact that there are two short stacks here is far more significant than the fact that we have JJ. If I was in the right mood here and I had seen the villain make this move before, I might resteal with a pretty wide range of hands. JJ is an added bonus to the situation that just makes it a no-brainer.