To fold or call on this river?

[HarshCharlie]

PokerRoom 0.50/1 Hold'em (8 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Things became a little bit hairy on the turn. I feel calling the turn is correct, . The river however, im not so sure about. No reads, first time playing with villain.

Preflop: Hero is SB with J[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/diamond.gif[/img].
<font color="#666666">3 folds</font>, MP2 calls, <font color="#666666">2 folds</font>, Hero completes, BB :#A500AF(villain)/ checks.

Flop: (3 SB) 5[img]/images/graemlins/spade.gif[/img], T[img]/images/graemlins/spade.gif[/img], 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, villain calls, MP2 folds.

Turn: (2.50 BB) 5[img]/images/graemlins/diamond.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">villain raises</font>, Hero calls.

Must I assume he has three 5s or has outflopped me?

River: (6.50 BB) 4[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">villain bets</font>, Hero?

Final Pot: 8.50 BB

[tyler_cracker]

the decision point here is the turn. you can either fold to the turn raise, or you can call the turn and call the river. there's no point doing anything else because you're not drawing to anything and because that river didn't change anything.

villain has to have a worse hand here 25% of the time for a calldown to be profitable. even if he semibluffs a lot, he's going to catch you on the river a significant minority of those times when he's semibluffing, which makes calling down even less attractive.