$11 - What are the chances he didn't limp with an overpair?

[pergesu]

Party Poker No-Limit Hold'em Tourney, Big Blind is t100 (6 handed) FTR converter on zerodivide.cx

MP (t1020)
CO (t685)
Button (t1942)
SB (t920)
Hero (t2475)
UTG (t958)

Preflop: Hero is BB with 9[img]/images/graemlins/club.gif[/img], 6[img]/images/graemlins/spade.gif[/img].
<font color="#666666">1 fold</font>, MP calls t100, <font color="#666666">2 folds</font>, SB completes, Hero checks.

Flop: (t300) 3[img]/images/graemlins/heart.gif[/img], 2[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(3 players)</font>
SB checks, <font color="#CC3333">Hero bets t200</font>, <font color="#CC3333">MP raises to t400</font>, SB folds, Hero ?