progressBB defense vs BTN open at 33 BB
8-max MTT · ante 12.5 % · Button opens, small blind folds · chip EV
How the BB defends at 33 BB
Facing a Button open to 2 BB (small blind folds) with 33 big blinds, the big blind folds only 7.9% of hands, calls 71%, 3-bets to 8 BB with 14% and goes all-in with 6.8%. The big blind already has one blind in the pot and closes the action, so it gets a good price.
Always 3-bet: AA, AKs, AKo, AQs, AQo, AJs, ATs, A9s, A6o, A3o, A2o, KK, KQs, QQ and 3 more.
Always all-in: ATo, A9o, A5o, 66, 55, 33, 22.
Folded: 93o, 92o, 83o, 82o, 72o, 62o.
Against other openers at 33 BB the big blind continues with: vs CO 85%, vs HJ 79%, vs LJ 76%, vs UTG+1 72%, vs UTG 72%. 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): Q2o 50%, T2o 54%, 73o 46%, Q3o 68%, 94o 22%. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 33 BB
The book continues with 92% of hands here, 92% at 32 BB and 92% at 35 BB. Going from 32 BB to 33 BB, no hand crosses the 50% line; only the frequencies shift. With the extra chips some former all-ins become small raises: A4o.
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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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