Questionable River

[Sean D]

.5/1 4-handed on Titan.

No great reads, but SB hasn't gotten out of line thus far. First time I've seen anyone check-raise a river, as the table has been passive thus far.

Hero opens K [img]/images/graemlins/heart.gif[/img]J [img]/images/graemlins/heart.gif[/img] on the button. Both blinds come along.

Flop: K [img]/images/graemlins/club.gif[/img]5 [img]/images/graemlins/club.gif[/img]6 [img]/images/graemlins/diamond.gif[/img]
Blinds check, <font color="red">Hero bets</font>, SB calls, BB folds.

Turn: 3 [img]/images/graemlins/diamond.gif[/img]
SB checks, <font color="red">Hero bets</font>, SB calls

River: 4 [img]/images/graemlins/diamond.gif[/img]
SB checks, <font color="red">Hero bets</font>, <font color="red">SB raises</font>, Hero pukes and folds....


My thoughts: I think flop and turn are pretty automatic, but the river is where it got interesting. The board got pretty scary, so I thought about checking behind, but I've been forcing myself to get out of the NL mindset and start value-betting more rivers. I haven't seen the SB get tricky yet, but has been playing slightly LAG. So, without being results-oriented, is this river a value-bet or check behind? River check-raise is an automatic fold, correct?