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I like betting the turn here.

I think it's your best chance of folding a lone [img]/images/graemlins/diamond.gif[/img].

Since you checked, I like the c/r.

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What I should have said was best chance of folding a gutshot, A6, A9 etc.
If there is one [img]/images/graemlins/diamond.gif[/img] willing to stay to the river, you want all of them to stay.
But there is a slim chance, if there is only low diamonds out, they may fold.
The best hands to try to fold would be gutshot/low flush combos.