[illegit]

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How about if cunningham knew williamson knew hellmuth is weak. And thought he could get them both out with resperenting a full house.

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That's great but Williamson is well aware of the fact there are players to act behind him thus he is very unlikely to be making a move in this spot. Again, the A in cunningham's hand would be a perfectly legitimate reason to come over the top of one bettor here, but not a bet and a raise. Williamson is not raising with the nut flush here. He probably would just call with as good as Kings full (though that hand is unlikely also because it bets the turn). And, as we determined a pure bluff facing a twice paired, 3 flush board and live players behind you is highly, HIGHLY improbable.