preflop checkie cause i have lost every pot in the last 7 days,

[ike]

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74s is a "really thin fold" if you 4 bet it to $1650 and the guy shoves for $5k?

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You have 30% equity against the range of jj+ aq+ and need 33% to call. Its a clear fold, but that doesn't mean its not close. The EV of putting in 1650 and folding is only slightly better than the EV of putting in all 5k and having a chance to suck out against reasonable ranges. So if shoving gives you much more fold equity at all its worth it.