progressBB defense vs CO open at 22 BB
8-max MTT · ante 12.5 % · Cutoff opens, small blind folds · chip EV
How the BB defends at 22 BB
Facing a Cutoff open to 2 BB (small blind folds) with 22 big blinds, the big blind folds only 16% of hands, calls 67%, 3-bets to 6.5 BB with 2.1% and goes all-in with 15%. The big blind already has one blind in the pot and closes the action, so it gets a good price.
Always 3-bet: AA, AQs.
Always all-in: AKo, AQo, AJs, AJo, ATo, A9o, A5o, A4o, K6o, QQ, JJ, TT, 99, 88, 77, 66 and 4 more.
Folded: Q5o, Q3o, Q2o, T5o, T4o, T3o, T2o, 94o, 93o, 92o, 83o, 82o and 3 more.
Against other openers at 22 BB the big blind continues with: vs BTN 87%, vs HJ 80%, vs LJ 78%, vs UTG+1 75%, vs UTG 73%. The later the opener, the wider its range, and the more the big blind defends.
Closest decisions (the book continues with them only part of the time): 84o 56%, J3o 62%, Q6o 28%. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 22 BB
The book continues with 84% of hands here, 84% at 21 BB and 84% at 23 BB. Going from 21 BB to 22 BB, no hand crosses the 50% line; only the frequencies shift. With the extra chips some former all-ins become small raises: ATs.
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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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