PokerSolver
PokerSolver/5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs CO all-in

BB vs CO all-in

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 250bb · CO limps, BB isolates to 3bb, CO 3-bets to 9bb, BB 4-bets to 20.7bb, CO goes all-in · Big blind to act

5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 271.84bbYour cards?
20.7bb
249.84bb
0.5bb

Tap your two cards.

Big blind's range

248 of 1,326 combos get here
Fold 76.5%Call 23.6%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO limps, BB isolates to 3bb, CO 3-bets to 9bb, BB 4-bets to 20.7bb, CO goes all-in in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 250bb?

CO limps, BB isolates to 3bb, CO 3-bets to 9bb, BB 4-bets to 20.7bb, CO goes all-in in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 250bb: the big blind (BB) folds 76.5% and calls 23.6%. Always call: AA, AQs+. Mixed: TT-KK, 77, A7s-A9s, A5s, KTs-KJs, K7s-K8s, AKo.

Always fold
99, 55, ATs-AJs, A2s-A4s, KQs, K9s, K6s, Q8s+, J9s+, T8s+, 87s, 64s
Always call
AA, AQs+
Mixed
TT-KK, 77, A7s-A9s, A5s, KTs-KJs, K7s-K8s, AKo
Settings: 5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 250bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.98). A jackpot fee on bigger pots is not in this solve, so lines that build big pots may be slightly too loose. Bet sizes are the solved ones; a size that is not here plays like the nearest one.

Fits exactly: no game we have checked.

Close: CoinPoker cash with antes NL50 (rake before the flop in 3-bet pots there, none here).

Rake sources: the ante from 93 of our own CoinPoker hands at $0.25/$0.50 with a $0.08 ante, played 2026-09-30; the caps and the preflop rule from coinpoker.com/games/texas-holdem/, fetched 2026-10-31.