When you don't want overcalls.

[SeaEagle]

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But you need a threeway parlay (I think that's the word)--you need CO to have aworse hand than yours, you need SB to have a better hand than yours and you need SB to fold that hand.

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CO is all in. So the value of the raise is completely dependent on sb's reaction to it. Whether you're currently beating CO is immaterial.