Semi-bluffing the river?

[fatdave]

Party Poker No-Limit Hold'em Tourney, Big Blind is t30 (10 handed) converter

MP2 (t297)
MP3 (t2280)
Hero (t1850)
Button (t3273)
SB (t448)
BB (t2026)
UTG (t2765)
UTG+1 (t4135)
UTG+2 (t885)
MP1 (t2195)

Preflop: Hero is CO with Q[img]/images/graemlins/spade.gif[/img], 7[img]/images/graemlins/spade.gif[/img].
UTG calls t30, UTG+1 calls t30, <font color="#666666">3 folds</font>, MP3 calls t30, Hero calls t30, Button calls t30, <font color="#666666">1 fold</font>, BB checks.

Flop: (t195) J[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(6 players)</font>
BB checks, UTG checks, UTG+1 checks, MP3 checks, <font color="#CC3333">Hero bets t100</font>, Button folds, BB folds, UTG folds, UTG+1 calls t100, MP3 folds.

Turn: (t395) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
UTG+1 checks, <font color="#CC3333">Hero bets t200</font>, UTG+1 calls t200.

River: (t795) 3[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
UTG+1 checks, <font color="#CC3333">Hero ???</font>


I probably don't get a J to fold, but if he had something like Ac 8c, or 99 he might fold.

I don't know if the correct term is "semi-bluffing" in this situation... but I used it because I may be able to get a better hand to fold, but not to get the best hand to fold.

However, should I just check because it's unlikely that a worse hand will call? If I bet less than 500 here, maybe I'll get 66 or KcQc to call, but then Ac8c would also call.