progressBB defense vs BTN open at 27 BB
8-max MTT · ante 12.5 % · Button opens, small blind folds · chip EV
How the BB defends at 27 BB
Facing a Button open to 2 BB (small blind folds) with 27 big blinds, the big blind folds only 9.8% of hands, calls 67%, 3-bets to 7 BB with 9.0% and goes all-in with 14%. 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, AQs, AJs, A8s, A3o, A2o, KK, KQs, QQ, JJ.
Always all-in: AQo, AJo, ATo, A9o, A8o, A7o, A5o, A4o, K6o, QJs, 88, 77, 66, 55, 44, 33 and 1 more.
Folded: 94o, 93o, 92o, 83o, 82o, 72o, 62o.
Against other openers at 27 BB the big blind continues with: vs CO 85%, vs HJ 79%, vs LJ 75%, vs UTG+1 73%, 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): T3o 56%, 73o 38%, T2o 32%. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 27 BB
The book continues with 90% of hands here, 90% at 26 BB and 91% at 28 BB. Compared with 26 BB, these hands come into the range: T3o. With the extra chips some former all-ins become small raises: TT.
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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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