BB defense vs CO open at 15 bb (4-max)
When CO opens, everyone else folds and you're in the BB, with an effective stack of 15 bb in a 4-max tournament, the solver plays 68.7% of its hands (call 49.4%, all-in 19.2%) and folds 31.3%. These frequencies come from Exploit It's full preflop tree: a chip-EV equilibrium with antes, computed for every position at the table.
Each cell: the share of each action for that hand, left to right. Gray cell: hand not in the range at this point.
Key takeaways for this spot
- The solver plays 68.7% of the hands that reach this spot, about 911 combos out of 1,326.
- Call is the main action for 48.9% of hands: from KQs down to 32s, the weakest hand played this way.
- All-in is the main action for 19.5% of hands: from AA down to 22, the weakest hand played this way.
- Conversely, the solver plays hands ranked outside the top 100, such as J2s, 96s, T5s, T4s.
What changes at 12 bb (15 hands change action)
- KQs: call here, all-in at 12 bb
- A8s: call here, all-in at 12 bb
- KQo: call here, all-in at 12 bb
- A7s: call here, all-in at 12 bb
- A7o: call here, all-in at 12 bb
- QJo: all-in here, call at 12 bb
What changes at 17 bb (9 hands change action)
- A9s: all-in here, call at 17 bb
- A9o: all-in here, call at 17 bb
- A8o: all-in here, call at 17 bb
- JTs: all-in here, call at 17 bb
- A3o: all-in here, call at 17 bb
- A2o: all-in here, call at 17 bb
Frequently asked questions
Which hands should you play from BB, facing an open, at 15 bb in 4-max?
The solver plays 68.7% of the hands that reach this spot, about 911 combos out of 1,326. Call is the main action for 48.9% of hands: from KQs down to 32s, the weakest hand played this way.
What should you do with small pairs (22 to 66) in this spot?
The solver's main action with each hand: 22 all-in, 33 all-in, 44 all-in, 55 all-in, 66 all-in.
What should you do with weak suited aces (A2s to A5s) in this spot?
The solver's main action with each hand: A2s all-in, A3s all-in, A4s all-in, A5s all-in.
How do you train on this spot?
Exploit It's free quiz deals you random hands in this exact spot and shows you the solver's answer after each choice.
Short stack: the push/fold chart, from 5 to 20 bb
Equilibrium computed by the Exploit It solver in chip-EV, antes included, open size 2 bb at 25 bb or less and 2.2 bb deeper. The model's range-width caps can make some EVs of unplayed actions optimistic: play the frequencies.