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And when KJ or some other two pair slows down and just calls because they're worried about spades, what do you do?

EDIT: even if all of your outs are squeeky clean, you'll only get one bet out of him on the river a lot of the time, which reduces your implied odds. I think that means you don't have enough to draw to two pair or trips, and I certainly don't think you're ahead after the flop action against a "normal" opponent.

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I think it beats check/folding because we may have him beat (not often), may have some fold equity and this way he will not only bet hands that beat us. I think we aren't good enough often to check/call down.

I think we can check/fold the river if he calls the turn, because I doubt he bets the river with much now that we have bet the turn.

True