I regularly play a low buy-in nightly tournament in a local casino.

Some typical aspects of play:

• Limping: There is lots of it
• 3betting: rare and typically AQ+, TT+ but for some players it's exclusively AK, QQ+
• Once people have VPIP'd they don't like to fold. So limpers will often call iso's and openers will typically call 3bets
• People don't seem to be positionally aware
• Post flop people tend to be sticky if they flop any kind of equity regardless of the context (probably because they are only considering their own hand)
• It is a lot easier to realise your equity post flop than in online games, since many villains will not attack obviously weak lines.

A few questions I have:

1. If there are several limpers and I am on the SB, how wide should I complete, given that 90% of the time the BB will check as well?
2. Say I'm in middle position and I have 2 limpers in front of me should I have a limp range and what should it consist of?
3. In that same scenario should my iso range be the same as the GTO opening range from that position or should it be significantly tighter than that?
4. If there is a raiser and several callers, how wide do I want to be calling in the BB
5. If I am first to act in early position should I have an open limp range and if so what should be in it?

These are the answers to those questions that I have typically been using up until now but I really am not sure if they are optimal:

1. I don't complete in the SB unless I have a hand with some potential such as AXs, Kxs, suited connecters, suited one-gappers or low pocket pairs
2. I would over-limp with a similar range to what I would complete with in the SB )see above)
3. I have been iso-raising tighter than GTO opening ranges due to the stickiness of the limpers
4. I haven't been calling widely from the BB multi-way as I don't want to be out of position post-flop with medium strength hands.
5. I don't open limp.

I pretty much agree with your approach, assuming you're talking about the early stages of a tournament when everyone's relatively deep.

Once the stack sizes start getting shorter the value of those implied odds hands goes down, and the value of high card combos that can make good top pair hands goes up.

When stacks are shorter it also becomes a lot more costly to do things like limp behind. Even opening too wide with a raise can backfire if you end up getting called a lot, and having to fold, usually to bigger stacks that can apply pressure postflop.

Make sure not to fall into the trap of bleeding a significant amount of chips. As you get shorter you generally want to play aggressively, and be more willing to go all the way and get your chips in the middle when you flop a decent piece.

Conversely as you get shorter you can often defend wider in the BB. The reason is that your equity realization goes up. If you flop a decent pair or draw, you can often just get your chips in the middle, and you're less likely to get blown off your hand.

All this is assuming you're not close enough to the bubble for ICM to be a major consideration.

Anyway, good luck on the tables!

Another common situation in these games that I am unsure of how to handle is when I am in early-ish position, there has already been a sticky limper and I am dealt a hand that's near the bottom of my opening range from that position, say AJo, Q9s, JTs.

What's the best way to play these? I presume that folding is too nitty. Iso-raising with all 3? Iso-raising with the AJo and limping behind with the others?

I will typically tighten up, and fold the bottom of my normal opening range if someone has limped, but it depends a lot on the limper and the table dynamics.

Do they limp strong hands or are they capped at very weak hands when they limp? If they're limping some stronger hands you want to tighten up more.

Also, what are the other players on the table likely to do? If you have aggressive 3-betters behind you generally want to tighten up more.

How likely is the hand to go multiway? Usually in these games, if you raise the likeliest result is that one or two other players along with the initial limper all call. If that's the case you want to play hands that play well multi way.

At 100 bb deep I would likely fold AJo and Q9s but might open JTs. JTs can make some straights and flushes that cooler the type of hands people flat you with, and you will flop some strong draws that can put a lot of pressure on weak ranges. If you flop a top pair type hand you'll want to play it cautiously though.

At 20 BB I would likely open the AJo, fold the Q9s and maybe open JTs. When you're that short it's less costly to flop an ace and be out kicked. If AJo makes top pair you can pretty happily get the money in, and if you're out kicked it's only 20 bb deep so that's pretty much a cooler whereas at 100 BB it could be a punt multiway.

This is all assuming people are calling fairly wide. In theory the ranges that over call should be fairly tight, but in practice people tend to call much wider, and also don't 3-bet enough.

Finally, what might be one of the most important considerations is how good you are in comparison to the other players postflop. I will attempt to isolate weaker players pretty relentlessly, but avoid playing pots with the best players unless I have a hand.

In a game like this, divide your range into hands you want to play heads up and hands you want to play multiway. Usually this looks like hands that flop strong 1 pairs or top two and hands that flop strong draws. Then play accordingly, it's not that difficult.

I typically move one to the left on the GTO chart with my open range and open to a larger size such as 4x due to the additional dead blind. If they are an extremely tricky limper you can mix in some min raises. And of course you can continue to complete middle strength hands on the button with other weak passive players in the blind. Vs multiple limpers you generally can also squeeze relentlessly from the BB with a strong linear range sometimes even to 6-8bb. Post flop since these players are weak passives you also get to play more "face-up" and don't follow GTO cbet frequency or sizings.

As the above posters mentioned at 20bb the strategy is different, if there is 4-5bb of dead money already then you can turn your 3bet rips in GTO into open rips vs limpers because there is the same amount of money in there and the limps are generally a weaker range