PokerSolver
PokerSolver/4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs CO all-in

BB vs CO all-in

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · CO limps, BB isolates to 2.5bb, CO 3-bets to 5bb, BB 4-bets to 11.5bb, CO goes all-in · Big blind to act

4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 92.48bbYour cards?
11.5bb
79.84bb
0.5bb

Tap your two cards.

Big blind's range

246 of 1,326 combos get here
Fold 76.8%Call 23.2%
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 2.5bb, CO 3-bets to 5bb, BB 4-bets to 11.5bb, CO goes all-in in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

CO limps, BB isolates to 2.5bb, CO 3-bets to 5bb, BB 4-bets to 11.5bb, CO goes all-in in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the big blind (BB) folds 76.8% and calls 23.2%. Always call: KK+, JJ, AKo. Mixed: QQ, 77, AQs+, ATs, A4s-A5s, KJs.

Always fold
88-99, 55-66, AJs, A7s-A9s, A2s-A3s, KQs, KTs, K6s, K4s, Q9s-QTs, Q7s, J9s+, J7s, T9s, T7s, 97s+, 54s
Always call
KK+, JJ, AKo
Mixed
QQ, 77, AQs+, ATs, A4s-A5s, KJs
Settings: 4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 80bb stacks, 5% rake capped at 4.8bb; 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.