Again, my river play is poor

[Nytecaster]

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Live 10/20 full.

I limp 77 utg. 3 more limpers, blinds check.

Flop is 5 [img]/images/graemlins/club.gif[/img] 3 [img]/images/graemlins/club.gif[/img] 3:spade. SB leads, BB folds, I raise, two folds, button calls two cold, SB calls.

Turn 6[img]/images/graemlins/diamond.gif[/img]. SB checks, I bet, both call.

River is an A [img]/images/graemlins/spade.gif[/img].

SB checks, this is an obvious bet right?

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I'm inclined to check, especially if you are against passive players who'll call with any ace or against aggressive players that love to check-raise the river with their trips/sets/flushe/straights/fullhouses. The only time I will bet is if I could somehow entice a bigger pocketpair to fold or someone with a smaller pair to call. Otherwise you have nothing to gain by betting and much more to lose. Since the small blind came out firing, its more likely he has rags which this flop could hit and a potentially deadly turn card.