[Oink]

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3) He may simply fold a hopeless hand which is way behind.
5) He is aggressive enough to bet the river when we check


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These are the main reasons you should consider checking behind on the turn when you have a hand that isnt strong enough to valuebet both turn and river

However if you can valuebet both streets you loose value from the "value-check". I am prolly a 6-max LAGtard but I'd valuebet both turn and river here against this guy.

If he is spazzy I'd call down a raise.