Call river with 3rd pair?

[Toronexti]

Poker Stars
Limit Holdem Ring game
Limit: $15/$30
9 players
Converter

Stack sizes:
UTG: $1907
UTG+1: $454.50
MP1: $315
MP2: $1431
MP3: $793
CO: $377
Button: $1181
SB: $260
Hero: $1681

Pre-flop: (9 players) Hero is BB with 6[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/spade.gif[/img]
3 folds, MP2 calls <font color="aaaaaa">(1.66666666667:1)</font>, MP3 folds, CO calls <font color="aaaaaa">(2.66666666667:1)</font>, 2 folds, 2 folds, Hero checks.

Flop: 5[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/spade.gif[/img] 2[img]/images/graemlins/spade.gif[/img] (3.67SB, 3 players)
<font color="#cc0000">Hero bets</font>, MP2 folds, CO calls <font color="aaaaaa">(4.66666666667:1)</font>.

Turn: 7[img]/images/graemlins/club.gif[/img] (2.83BB, 2 players)
<font color="#cc0000">Hero bets</font>, CO calls <font color="aaaaaa">(3.83333333333:1)</font>.

River: 6[img]/images/graemlins/heart.gif[/img] (4.83BB, 2 players)
Hero checks, <font color="#cc0000">CO bets</font>, Hero ??

[Nate tha\\\' Great]

The straightening board cards aren't as scary as they might be because people aren't going to peel all that loose with those hands on monotone boards in tiny pots. Both bet-folding and check-calling are fine; you have enough equity to put a bet in the pot.