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I don't think DIPO works that way when you are trying to figure runner runner. DIPO is usually applied trying to figure outs for the next card.

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DIPO is used to figure out if you have pot odds to call a bet. You need to know your expected outs in order to use DIPO correctly. Figuring out the expected outs on a runner-runner draw fits in with this idea. I think it works good (or is that 'works well'?)

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I agree you can call with a backdoor flush draw if you get 23:1 to see BOTH cards, ie you are all in on the flop and will not be faced with another bet.

But if you are only getting 23:1 to see the turn card, you are overpaying if you will also be faced with calling a bet to see the river.