progressBTN open range at 21 BB
8-max MTT · ante 12.5 % · folded to the Button · chip EV
How BTN opens at 21 BB
When the action folds to the Button with 21 big blinds (8-max MTT with ante), the book plays 41% of hands: a raise to 2 BB with 36% and all-in with 5.1%. The other 59% fold.
Always raised: AA, AKs, AKo, AQs, AQo, AJs, AJo, ATs, ATo, A9s, A8s, A8o, A7s, A6s and 55 more.
Always all-in: A7o, 44, 33, 22.
Mixed hands (the book splits them between actions): A9o, A6o, A5o, KQo, QJo, QTs, Q9s, JTs, J8o, J5s, T9s, T6s, 96s.
At this depth the open is a small raise, with some hands going all-in directly.
Next to it at 21 BB: CO 32%, SB 87%. Seats closer to the button open more here, because fewer players are left to wake up with a big hand.
Closest decisions (the book opens them only part of the time): J5s 68%, J8o 26%. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 21 BB
The book opens 41% of hands here, 41% at 20 BB and 42% at 22 BB. Going from 20 BB to 21 BB, no hand crosses the 50% line; only the frequencies shift. With the extra chips some former all-ins become small raises: A8o, A6o, QJo, 87s.
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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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