Lets say we have a villain with reasonable stats like 22/18/2 and has a fold to 3bet of 70%
He plays 40BB deep.
He opens a pot from MP for 4BB, making the total pot 5.5BB
He will only fold to your three bet, or shove over top of it, and nothing in between.
Say we're in the CO/Button. What range of hands are we three betting? How big are we making our three bets? Do we ever fold any of our 3-bet range to a shove?
