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When using the ICM function in PIO, if we set up our normal non ICM sims for an accuracy of 0.25% of the pot, what is the ICM utility per hand number which would be similar to that?
I don't know. It's hard to determine. Equilibrium with ICM is a shaky concept (because it's not a zero sum game). I suggest running it for similar period as you would a normal simulation.
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It is a bit unclear of what the ICM utility per hand accuracy means and what it should be to create an accurate sim.
Let's assume you have 2 players:
-player 1 with a stack of 1000 chips worth 2000$ according to ICM
-player 2 with a stack of 500 chips worth 1200$ according to ICM.
You solve it to near equilibrium. Now it turns out player 1 can get 2005$ worth of chips if they follow maximum exploitive strategy and player 2 can get 1202$ worth of chips if they follow maxium exploitive strategy. This means a perfect adversary would win 5$ + 2$ per 2 hands or 3.5$/hand. This is exploitability in ICM utility.
This is the only sane way to calculate exploitability in ICM calculations because that's what both players try to maximize (instead of their chips).
You can see ICM utilities for starting stack when you fill in stacks/payouts.