Folding the river

[topspin]

Working on my river folds. New to table, Villain is an unremarkable 43/0.0.75 over a whopping 7 hands.

Standard river fold, or horrible?

Party Poker 0.5/1 Hold'em (10 handed) converter (http://www.selachian.com/tools/bisonconverter/hhconverter.cgi)

Preflop: Hero is BB with 8/images/graemlins/heart.gif, A/images/graemlins/club.gif.
UTG calls, UTG+1 calls, <font color="#666666">1 fold</font>, MP1 calls, MP2 calls, <font color="#666666">3 folds</font>, SB completes, Hero checks.

Flop: (6 SB) 8/images/graemlins/diamond.gif, 2/images/graemlins/diamond.gif, 8/images/graemlins/spade.gif <font color="#0000FF">(6 players)</font>
SB checks, <font color="#CC3333">Hero bets</font>, UTG calls, UTG+1 folds, MP1 folds, <font color="#CC3333">MP2 raises</font>, SB folds, <font color="#CC3333">Hero 3-bets</font>, UTG folds, MP2 calls.

Turn: (6.50 BB) J/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, MP2 calls.

River: (8.50 BB) K/images/graemlins/diamond.gif <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets</font>, <font color="#CC3333">MP2 raises</font>, Hero folds.

Final Pot: 11.50 BB

[shadow29]

Why not check/call river?

[Gravy (Gravy Smoothie)]

The reason for not check/calling the river is that a bet may drie out a singleton low diamond. In addition, there are hands that will call a bet here that Hero beats.