progressBB defense vs UTG open at 80 BB
8-max MTT · ante 12.5 % · Under the Gun opens, small blind folds · chip EV
How the BB defends at 80 BB
Facing a Under the Gun open to 2.1 BB (small blind folds) with 80 big blinds, the big blind folds only 33% of hands, calls 61%, 3-bets to 10.5 BB with 6.0% and goes all-in with 0.1%. The big blind already has one blind in the pot and closes the action, so it gets a good price.
Always 3-bet: AA, AKs, AKo, KK, QQ.
Folded: K7o, K6o, K5o, K4o, K3o, K2o, Q8o, Q7o, Q6o, Q5o, Q4o, Q3o and 21 more.
Against other openers at 80 BB the big blind continues with: vs BTN 71%, vs CO 73%, vs HJ 73%, vs LJ 70%, vs UTG+1 68%. The defence does not simply grow with the position of the opener here; the exact chart for each opener matters.
Closest decisions (the book continues with them only part of the time): J7o 38%, 74o 64%, 63o 34%, K8o 32%, 52o 28%, A3o 76%, plus 1 more mixed hands. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 80 BB
The book continues with 67% of hands here, 66% at 70 BB and 65% at 100 BB. Going from 70 BB to 80 BB, no hand crosses the 50% line; only the frequencies shift.
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Numbers come from the progressGTO solution book (v14, chip EV, 8-max, ante 12.5 %): our own equilibrium computation with a modelled postflop. It is an approximation, not an exact solution, and it keeps improving. Hover or tap a hand to see its exact frequencies.
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