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if your read told you that your opponent never 3bet the turn with just tptk, then i think you could make an excellent argument for folding river unimproved.....right.

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This is exactly my point. Reads don't tell you that a player NEVER makes a certain move, but rather that it is UNLIKELY that he would make such a move. As such, I think it's a huge mistake to check/fold this river because of such a read.

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This is a good point, the read is not fool proof and some cards might make it worth it to payoff. Although, I think a K is a reasonable concern here - maybe a check/call is warrented for a 6-J?