pot odds and raising on the turn

[JinX11]

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Your nut flush outs give you about 20% equity.

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Can you explain how to calculate this?

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9 cards give Hero the nut flush. There are 46 unseen cards on the turn. 9 divided by 46 is about 20%.

[Songwind]

Also, Ace to Five is the Wheel.

The idiot straight is the low end of the straight (89s and a TJQ board).