I am new and just giving my opinion so let me know if you disagree. Did his check on the turn not show weakness and then gives the villain the opportunity to bet his big ace or even a hand like jacks more confidently. Remember he was in the BB and many people will call raises from BB with bad hands. I feel like the hero's turn check just induced a bet possibly. I just feel that a raise is in order on the river for value. I would not be worried about anything but 99, 22, and kk. if in disagreement please explain why. thanks.