progressBB defense vs CO open at 100 BB
8-max MTT · ante 12.5 % · Cutoff opens, small blind folds · chip EV
How the BB defends at 100 BB
Facing a Cutoff open to 2.2 BB (small blind folds) with 100 big blinds, the big blind folds only 26% of hands, calls 60%, 3-bets to 11.5 BB with 14% and goes all-in with 0.2%. 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, KK, KQs, QQ, JJ, TT, 99, 88.
Folded: Q6o, Q5o, Q4o, Q3o, Q2o, J3o, J2o, T5o, T4o, T3o, T2o, 95o and 10 more.
Against other openers at 100 BB the big blind continues with: vs BTN 74%, vs HJ 73%, vs LJ 71%, vs UTG+1 67%, vs UTG 65%. 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): 42o 56%, J5o 42%, 74o 42%, T6o 58%, 32o 58%, K4o 60%, plus 4 more mixed hands. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 100 BB
The book continues with 74% of hands here, 73% at 80 BB. Compared with 80 BB, these hands come into the range: K4o, Q7o.
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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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