[sthief09]

if he's not tricky, I like a bet. if you aren't sure you can fold to a raise then I like check-call down. you're in good shape against his range right now. unfortunately he always has plenty of outs. there are 9 unseen diamonds, and if he has none, he has 5.5 (9/2 diamonds + 2/2 queens) outs automatically.

the question now is what if he calls? I would probably bet again, as you're less of an underdog. checking there shows a lot of weakness and can let him take it away