[milesdyson]

just call him down. this really looks like a nut flush draw pumping the flop, and yeah even bad players eventually figure out to check raise spots like that.

so he checks, you bet, call, call, he raises, but you 3-bet and fold the other two guys out so he just calls.

then leads a turn [img]/images/graemlins/diamond.gif[/img]. other possible hands are any other Qs, but more likely those with diamond kickers.