Another standardish spot. 6 people limp to the sb who raises, I call bb with 87o, all call.

Flop 9T3r. Sb bets, I call, all call.

Turn 8. X around.

River 5. Sb bets.

What do?

Call, ez hand.

What is SB possibly thinking here?

It could be a over pair that was scared of two pair/straight and now is not scared once it checked through. Or it could be something really dumb. I’m my experience people are pretty tight with raises in the small blind.

The problem with calling here is you are likely to get called by any 9s or the Tens. I’d might actually raise here.

The flop has gotten very big on the flop, with 16 small bets (minus rake/drop). Would it be worthwhile to raise the Sb flop bet, to get a gut shot like KQ to fold on the flop? Even getting KJ to fold on the flop would be advantageous as it might stop us from getting counterfeited on the river, if a J comes on the turn.

On the other hand, with that many bets already in, perhaps gut shots are unlikely to fold. Maybe if there were 3 limpers, rather than 6, a flop raise might be more useful.

KQ and KJ shouldn't fold the flop for 2 cold. Just keep clicking call until you make a straight. Fold river now and wp. Can't bluffcatch third pair against a player that bet 6-ways on the flop and 6-ways on the river with four people behind you.

This.

He just bet into the whole table on the river; he can beat third pair.

I think folding the river here is bad. We are getting 17 to 1 on a call and I could see ninefingershuffle's reason for raising here to get better hands like JT or J9 to fold behind us. The pot is big enough to merit raising and SB has AK or AQs here a ton. If SB is competent in the least he knows he can't possibly win by checking these hands OTR.

By my count the river call is getting 13 to 1 not 17 to 1 (8 players two bets preflop, 8 players one bet flop + plus 1 player 1 big bet river).

In small blind's place I x/f with Ahi, maybe I'm a nit. Really curious how many players here would bet out their unimproved Ahi in sb's position.

Considering the PFR, most people in SBs spot have a defensively played overpair, or ATs/A9s. Possible they're betting the river into 5 people with missed big cards, but that guy is either a genius or a lunatic.

I’m grand central station and I think the rivers a fold, that means it’s a FFFFOOOOLLLLDDDDD

BB's hand only has to be good 1 in 7 times here to make calling the correct play and SB only has to make the field fold 9% of the time to make bluffing this river profitable. Either way folding this river is a huge leak and exploitable if we are in hero's spot given his hand will be good and SB has AJ+ easily more than 8% of the time here.

We have no read on the SB. Would he check this flop with UIP overs? Is he a reasonable person or a nutcase? What range is he raising preflop with?

I wouldn't raise the river. I would expect someone with a T or a 9 to bet the turn and maybe even raise the flop. I think raising is a good thought but I'd need a situation where I could get better hands to fold and I wasn't up against what seems to be a polarized range of the SB. Also, your raise should look awful suspicious although I doubt these folks are doing much hand reading.

It's pretty surprising that the turn was checked through here. It's very possible the SB was getting tricky and going for a CR. Value betting a big Ace doesn't make sense. Bluffing a hand like AJ doesn't make sense. We are dealing with limping ranges here although people do limp with big Aces.

Given the size of the pot and the pure confusion of the situation I would call absent more info. I'd expect to lose a ton. Maye he has 66's, maybe he is bluffing with K or Q high. Maybe he just didn't know what to do with his AK and figured he is calling so he should bet.

id' rather raise and get better hands behind you to fold than call

I am having a hard time convincing myself anything but fold is good here. I get the argument for a low frequency raise if sb is super thin, bluffing here.. but it seems optimistic.