Following on from spoons comments:

With AK vs AK, QQ+ you aren't a huge dog. 100bb deep, If you 4b AK pre and the 3b-ing villain shoves with a range of AK, QQ+, it is sometimes a call, depending on bet sizes.

eg.

you raise 4bb, villain 3b to 12, you 4b to 36, villaikn shoves. potsize = 137.5, bet to call is 64. Easy call if villain has boith AK and QQ in his range. It's even a call if villain is only shoving AKs, QQ+

However, you raise 3bb, villain 3b to 9bb, you 4b to 27bb, and villain shoves, then it's a fold as the bet to pot ratio isn't as favourable.

Text results appended to pokerstove.txt

575,334,144 games 0.468 secs 1,229,346,461 games/sec

Board:
Dead:

equity win tie pots won pots tied
Hand 0: 39.594% 19.26% 20.33% 110831016 116968584.00 { AKs, AKo }
Hand 1: 60.406% 40.08% 20.33% 230565960 116968584.00 { QQ+, AKs, AKo }


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Disclaimer: I have not checked the above thoroughly and have a tendancy to talk out of my ass!