Fold these Jacks preflop?

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Folding the best hand with 1000 in the pot for 1400 more is really bad.

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But losing your whole stack to the other bigstack who has shown great strength by making a questionable call is worse.

I think you should fold this too, unless you have a good read on the villain making this move with a wide range of hands.

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I never said I would call. I'm just saying if I "knew" I was in a coinflip situation this is an easy call becasue there is already 1000 in the pot.