[Chargers In 07]

[ QUOTE ]
wouldn't I have to call his rather small all-in either way (well, not if I actually knew his cards)?

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Let's say that the sb started the hand with your starting stack (23.50). You'd be getting 4.14:1 on your call after your raise to $12 meaning you need 19.4% equity to call. Against Jacks on this board AK has 22.9% equity. So even if you knew what his cards were after you raise you'd have to call his push.