[Magikist]

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i doubt you are ahead here often enough to bet,

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::barfs::

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you should then likely be folding most of the time

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::barfs::

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check here is the only play

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::dry heaves::

Villain is unknown. Against unknowns you must logically assume he plays average. The average 10-20 6-maxer defends his big blind liberally and peels flops liberally. No way you can give a free card here. Once you are raised, he only has to bluffing/overplaying 20% of the time for your call down to be good - assuming a diamond doesn't fall on the river. If diamond does fall, you have an easy decision.

A very standard line, imho, absent reads.

*Only against good players do you mind a turn check-raise, so that you might then consider checking it through. Game theoretically speaking, only their checkraises actually puts you to a tough decision. You want the aggro-semibluffer to hurt his own odds by semibluffing, and you should be calling down against him. You want the straightforward players to checkraise you so you can confidently cut your losses. In both cases, you are being given reliable information by the c/r so you don't make a mistake. It is only the checkraise of a good player capable of varying his play that will provoke you to make a mistake.