[jay_shark]

I would prefer to check the river . If he has a queen , he may be trying to represent the 9 by betting out a substantial amount .

The river bet has almost no positive EV value . Any ace hand would result in a chopped pot if the kicker is less than the queen . If this player does have a queen , then you may argue that you lose value by not betting but I actually think the paired 9 induces a bluffing opportunity for this player . The 9 is a potential scare card for you and this player knows it .