Party 10-20 NL bluff

[HiatusOver]

65 seems like a weak stab at the pot from an unknown. This is clearly not an exact science though. Basically my check-raise only has to work here like 55 percent of the time to be +EV. Do u think he is calling this check-raise half the time? There is a good chance he is folding everything but TPGK, a set or an overpair...I dont think he has those hands a majority of the time