played weakly? fold the river?

[Gravy (Gravy Smoothie)]

Party Poker No-Limit Hold'em Tourney, Big Blind is t30 (9 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

MP2 (t685)
MP3 (t900)
CO (t755)
Button (t875)
Hero (t740)
BB (t755)
UTG (t730)
UTG+1 (t870)
MP1 (t1690)

Preflop: Hero is SB with A/images/graemlins/diamond.gif, A/images/graemlins/heart.gif.
UTG folds, UTG+1 folds, MP1 folds, MP2 calls t30, MP3 folds, CO folds, Button folds, <font color="#CC3333">Hero raises to t100</font>, BB folds, MP2 calls t70.

Flop: (t230) 5/images/graemlins/diamond.gif, 8/images/graemlins/heart.gif, 6/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
Hero checks, MP2 checks.

Turn: (t230) T/images/graemlins/spade.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets t230</font>, MP2 calls t230.

River: (t690) 9/images/graemlins/spade.gif <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">MP2 bets t355 (All-In)</font>, Hero calls t355.

Final Pot: t1400

[Xhiggy]

given that the player who called you (MP2) is somewhat short stacked and the board is coordinated, you can't slow play the flop. I would bet the flop, about 1/3 of what MP2 has left (200).

[flytrap]

The only time you'd ever check this flop is if you're sure he'd bet. Since you probably can't have this good a read on someone, make a pot sized bet. Too many draws can hurt you here. That being said, I'm calling the river here, since you showed weakness on the flop and river.

[ColdestCall]

I think you have to bet the flop here with both the flush and straight draw possibilities on board. Feels to me like you are in a lot of trouble on the river if this guy is any kind of player. He limped coming in and called your raise, suggesting a hand like a small pair or suited connectors, or maybe something like A-x suited or K-x suited, or KQo, KJo, JQs or off, J-10s or off. If he has an overpair, top pair, two pair or trips he probably bets the flop, so let's eliminate 99, TT, JJ, QQ, KK, 55, 88, 66, 6-8s. When he calls the turn, either the ten helped him or he has a flush or a straight draw with a pair. He should not have called with only a straight draw or only a flush draw. When he moves in on the river instead of just checking the hand down, he's there. I think he has 67s, 77, or 10,9s, maybe K-7d or Q-Jd and you are beat. Dont know if I could have layed it down though.