[Boredom]

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The ABC player has the nutflush with 100% certainty.

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Then raise the flop to get more money in before the board pairs. As another person said, sets are unlikely since you have 78. Not raising here to me just accomplishes getting TTT to come along when it's out (he may come anyway since it's deep). But IMO you must raise the flop to get more money in right away. If nobody else calls your raise and pf raiser smoothcalls, obv bomb any turn that doesn't pair the board. If board pairs on turn check behind and hope he pays off the river (I would if I were him since a flop raise from a set is totally nonstandard and retarded).

*Edit* Actually you could maybe smoothcall this since you DO have 78, board will only pair what, 14% on turn? But I think you stack the nutflush by raising 100% of the time, versus only really keeping in a couple of unlikely hands by smoothcalling, which aren't going to pay off unless board does pair anyway. And if you keep in a hand like the K-high flush instead of a set by smoothcalling, and board pairs on the turn, that's a disaster (especially deep).