3/6NL.

Effective stacks are $714 and it's 6-handed.

I open UTG+1 to $18 with A K. Only the BB defends. He's a solid regular.

Flop is 7 K Q. He check-calls $33.

Turn is 6. He check-calls $72.

River is 9. He checks. Hero?

If the turn doesn't put a backdoor flush draw out there, does this affect your river decision?

Thanks!