progressBB defense vs HJ open at 9 BB
8-max MTT · ante 12.5 % · Hijack opens, small blind folds · chip EV
How the BB defends at 9 BB
Facing a Hijack open to 2 BB (small blind folds) with 9 big blinds, the big blind folds only 28% of hands, calls 54%, 3-bets to 4 BB with 0.5% and goes all-in with 17%. The big blind already has one blind in the pot and closes the action, so it gets a good price.
Always all-in: AA, AKs, AKo, AQs, AQo, AJs, AJo, ATs, ATo, A9s, A9o, A8s, A8o, A7o, A5o, KK and 4 more.
Folded: Q7o, Q6o, Q5o, Q4o, Q3o, Q2o, J6o, J5o, J4o, J3o, J2o, T5o and 10 more.
Against other openers at 9 BB the big blind continues with: vs BTN 72%, vs CO 69%, vs LJ 70%, vs UTG+1 70%, vs UTG 70%. The defence does not simply grow with the position of the opener here; the exact chart for each opener matters.
Closest decisions (the book continues with them only part of the time): K4o 48%, K5o 54%, 63o 56%, 95o 42%, K2o 40%, K6o 62%, plus 10 more mixed hands. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 9 BB
The book continues with 72% of hands here, 75% at 8 BB and 71% at 10 BB. These leave it: K4o, 95o. Some hands switch to an all-in: 77, 66.
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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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