Reads: SB is pretty loose pre flop in flatting but not overly aggressive post flop. Does not seem to understand the "gap concept" and flats raises pre flop seemingly without regard to position. CO is an unknown. Both players started the table shortstacked and are still shortstacked, I cover both.

Folds to CO with a $32 stack who limps. I open for $10 on the button with A10.

SB flats with a $80 stack. BB folds. CO shoves. I call, as it would be a neutral EV call if villain were to have JJ-KK, and the shorstack shove will often be far weaker hands (i.e. KJ, A9s, small pairs).

To my surprise, SB instant shoves. Hero?

I'm assuming you have 100BB. Lesson #1. Don't call SS shoves if other players are in the hand.

Neither player has a monster, otherwise they would have raised the first time around. You gain more equity by forcing a fold than keeping anyone else in, so just shove. You'll get folds from AJ for sure and probably AQ as well. As you see as played, you really can't fold anyway.

Call SB shove (in his shoes I would shove with my entire range).

I am not sure what I would do facing the first shove from CO.. probably shove myself.

Not shoving yourself makes no sense. Bad mistake I see all the time.

Preflop: Overlimp. By raising you commit yourself to playing for CO's stack, while giving CO the opportunity to dump his lesser holdings. More importantly, raising now will put you in undesirable situations on future streets. For example, say you raise and SB and CO both call. If you miss the flop you'll either be trying to c-bet bluff two players who will call with wide ranges, or you'll check through and put yourself in a situation on the turn where CO will often be shoving and you've got a loose player still to act behind you. Keeping the pot small preflop will allow you to better use your position postflop.

As played, reshove over the CO's all-in. Most hands that SB could have that put you in really bad shape would have already been 3bet, but a shove will force out some hands you'd really like to fold like AJ and small pairs. The risk of running into a monster from SB is small, and the benefit of getting $10 of dead money in the pot greatly improves your EV against a short stack.

Just my opinion...

EDIT: I explained that first paragraph poorly. Keeping the pot small preflop allows you to better exercise your advantages in the hand postflop.

You either have to fold to the CO or ISO him and push out the SB. As played you should call.

Results: I called, BB had AQo and it won. CO didn't show.

Ugh. I hate that limp/shove thing.

I figure CO could be on a range of pp, probably 88+. I kind of doubt he is on broadway type hands. Even if he is, most would have you dominated.

I would really be inclined to fold to the 3bet heads up. Worrying that SB might be along for the ride makes it that much worse.

I think I would fold to the 3bet.

Sniping AT against top 15% and 88+, you are only 22% to win.