progressBB defense vs CO open at 15 BB
8-max MTT · ante 12.5 % · Cutoff opens, small blind folds · chip EV
How the BB defends at 15 BB
Facing a Cutoff open to 2 BB (small blind folds) with 15 big blinds, the big blind folds only 21% of hands, calls 59% and goes all-in with 20%. 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, A6o, A5o and 16 more.
Folded: Q6o, Q5o, Q4o, Q3o, Q2o, J4o, J3o, J2o, T5o, T4o, T3o, T2o and 9 more.
Against other openers at 15 BB the big blind continues with: vs BTN 79%, vs HJ 78%, vs LJ 78%, vs UTG+1 75%, vs UTG 74%. 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): K2o 50%, Q7o 56%, J6o 34%, 95o 70%, J5o 24%. These are the hands worth drilling, because a small change in the opponents or the stack flips them.
What changes around 15 BB
The book continues with 79% of hands here, 75% at 14 BB and 80% at 16 BB. Compared with 14 BB, these hands come into the range: K2o, Q7o, T6o, 95o. Some hands switch to an all-in: 44, 33, 22.
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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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