progressCO open range at 18 BB
8-max MTT · ante 12.5 % · folded to the Cutoff · chip EV
How CO opens at 18 BB
When the action folds to the Cutoff with 18 big blinds (8-max MTT with ante), the book plays 30% of hands: a raise to 2 BB with 29% and all-in with 1.5%. The other 70% fold.
Always raised: AA, AKs, AKo, AQs, AJs, AJo, ATs, ATo, A9s, A8s, A8o, A7s, A7o, A6s and 41 more.
Always all-in: 33.
Mixed hands (the book splits them between actions): AQo, A9o, KQo, K2s, JTs, J9o, J7s, 97s, 87s, 44.
At this depth the open is a small raise, with some hands going all-in directly.
Next to it at 18 BB: HJ 26%, BTN 40%. 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): K2s 44%, 97s 32%. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 18 BB
The book opens 30% of hands here, 30% at 17 BB and 31% at 19 BB. These leave it: 22. With the extra chips some former all-ins become small raises: A9o, KQo, 44.
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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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