progressBB defense vs CO open at 12 BB
8-max MTT · ante 12.5 % · Cutoff opens, small blind folds · chip EV
How the BB defends at 12 BB
Facing a Cutoff open to 2 BB (small blind folds) with 12 big blinds, the big blind folds only 30% of hands, calls 50% and goes all-in with 20%. The big blind already has one blind in the pot and closes the action, so it gets a good price.
Always all-in: AA, AKs, AKo, AQs, AQo, AJs, AJo, ATs, ATo, A9s, A9o, A8s, A8o, A7s, A7o, A6s and 18 more.
Folded: K3o, K2o, Q7o, Q6o, Q5o, Q4o, Q3o, Q2o, J6o, J5o, J4o, J3o and 17 more.
Against other openers at 12 BB the big blind continues with: vs BTN 75%, vs HJ 72%, vs LJ 73%, vs UTG+1 73%, vs UTG 72%. 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 54%, 85o 54%, 74o 28%, 63o 26%, K5o 78%. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 12 BB
The book continues with 70% of hands here, 71% at 11 BB and 74% at 13 BB. Compared with 11 BB, these hands come into the range: 85o. These leave it: Q8o, 63o. Some hands switch to an all-in: QJs, 55.
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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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