progressBB defense vs BTN open at 13 BB
8-max MTT · ante 12.5 % · Button opens, small blind folds · chip EV
How the BB defends at 13 BB
Facing a Button open to 2 BB (small blind folds) with 13 big blinds, the big blind folds only 24% of hands, calls 51%, 3-bets to 4.5 BB with 2.0% and goes all-in with 23%. The big blind already has one blind in the pot and closes the action, so it gets a good price.
Always 3-bet: KK, KTs.
Always all-in: AA, AKo, AQs, AQo, AJs, AJo, ATs, ATo, A9s, A9o, A8s, A8o, A7s, A7o, A6s, A6o and 16 more.
Folded: Q5o, Q4o, Q3o, Q2o, J6o, J4o, J3o, J2o, T5o, T4o, T3o, T2o and 13 more.
Against other openers at 13 BB the big blind continues with: vs CO 74%, vs HJ 74%, vs LJ 75%, vs UTG+1 74%, 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): J5o 50%, Q6o 58%. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 13 BB
The book continues with 76% of hands here, 75% at 12 BB and 78% at 14 BB. Compared with 12 BB, these hands come into the range: J5o. With the extra chips some former all-ins become small raises: KK, KJs.
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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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