Awesome, I'll be sure to look out for your threads so I can spam them too.

Let's say we open AK/QQ and face a 3bet. our assumptions are:

- Villain will 5bet AI with AK,QQ+ (2.6% of hands)
- We have around 40% equity vs this range
- Our EV when we get it in is around -17bb (cba writing out the working, this is why i made a spreadsheet)
- When villain folds we win his 3bet and whatever blinds are lying around

So we need villain to 3bet and fold to our 4bet often enough that those 12bb or so make up for our loss when we get it in. This might happen because he 3bet bluffs, or because he 3bets hands like KQs, or TT that he folds to a 4bet.

If villain 3bets
4% = -6.2bb EV
5% = -2.1bb EV
6% = 0.6bb EV
7% = 2.5bb EV
8% = 3.9bb EV

From this we see it's +EV to 4bet-call with these hands at anything over 5% 3bet. BUT! If we just fold AK/QQ to a 3bet we are losing 3bb anyway, so 4bet-calling against a 5% 3bet range still does better than folding to the 3bet. Arguably, we can do better by flatting the 3bet, but that's hard to calculate and is going to depend a lot on our skill and villains tendencies in 3bet pots.

Hope that makes sense, it's late here and I'm tired.

OK, makes sense zumby. We can 4bet-call but we need to know we can get enough folds to make it worth while and if he folds all but QQ+/AK, then we need villain to have around a 5.4% 3-bet or higher range. At this point we have a break even decision, more than that we make money and much higher he has a wider 4-bet range anyway.

PS I got slightly different figures than you, that might be because I'm using Pokerstove and I think the range % only going to 1 decimal place is too inexact for calculating the split between villains's ship and fold range.

I don't play stars which I hear is very nitty.

Sites I've played (all linked to sports betting operations), I need a really, really good read to fold QQ or AK pre 100bb deep.

Villian stack off range is much wider than anything stated above and generally includes AQ and JJ making QQ a snap call or 5b shove.
Like I said not stars so ranges might be much tighter. Not sure it's ever a major error getting it in though.