stud/8 - rolled 9s multiway

[Andy B]

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isnt there some rule about not jamming when you have to lose lose half the pot?

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If your edge is small, sure. You might be in a three-way pot and be a favorite in your direction, but not a 2:1 favorite, so you only call. In this case, it's a four-way pot. You're laying 1:1. You're much better than even money to have the best hand, so you get your money in there.