live $6/12 - 2nd nuts - when to stop raising

[PokrLikeItsProse]

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I have never seen a 6-bet river where the 2nd nuts is winner. That said, it's nearly impossible to believe villain has KK here.

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I have, but the aggressor was an idiot. I also know players who would play kings this way (they thinking would go: can't raise preflop because an ace will flop, have to slowplay the flop with the nuts, oops can't raise the turn because someone might have a straight, I have a full house so let's rock).

I actually might be a bit shocked if the villain has a flush here. I find KK a bit more believable.