Please don't pair the river

[Chairman Wood]

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I bet, BB raises, MP cold-calls, I 3-bet, BB caps, MP calls.
BB has Kc8c for the rivered flush. MP has AsAh.

Was I wrong to 3-bet in this spot?

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He can be quite aggressive postflop HU, such as bet/3-bet 77 on 78JA9 after the PFR called his flop check-raise and turn bet.

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so no, although your read was HU, your 3-bet is necessary.