Hi,
Originally posted by johnbeattie85
You should never check behind. Loose passive SB will call down with so many worse hands. If he plays check/call, check/call, check/shove, it's not the best spot vs such a passive player, but you shouldn't mind that much since he can be 'slowplaying' AT, AQ type stuff. Only thing I would do differently is value bet the river larger and cbet larger.
That's the idea. Just because sometimes he'll check/shove a monster doesn't mean he's never check/calling with worse, more often than not he's check/calling with worse way often enough to make it profitable for you to bet regardless of the times you get shoved on.
That said I don't really he'd take that line with two pairs overall, so i'm not sure you're ahead on his range on the river. He looks really passive and these players don't raise with medium strength hands very often on the river. I think he has better than two pairs a good amount of the time. As played you can probably still find a fold, but if you take johnbeattie85's advice (which you should) and bet the river bigger for value, you'll have to call a shove for sure regardless.
Hope it helps.