[ArmenH]

If he's a tricky lag I wouldn't recommend bloating the pot oop with a hand like Q9. You get yourself in too many difficult spots and are almost always outkicked if you flop top pair. If you wanted to check and call the flop I advise to continue playing your hand like a draw and to check and call the river. Since the turn went check check the only hands that could be shoving the river for value are Q10 and 10's. Possibly a hand like 46s or A4s. If you want to bet river as a block/value bet you should really be betting more prevent your opponent from bluff raising a weak bet.