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

BB vs SB all-in

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · SB limps, BB isolates to 3bb, SB 3-bets to 9bb, BB 4-bets to 20.7bb, SB 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 101.18bbYour cards?
20.7bb
79.84bb

Tap your two cards.

Big blind's range

522 of 1,326 combos get here
Fold 85%Call 15%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when SB limps, BB isolates to 3bb, SB 3-bets to 9bb, BB 4-bets to 20.7bb, SB goes all-in in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

SB limps, BB isolates to 3bb, SB 3-bets to 9bb, BB 4-bets to 20.7bb, SB goes all-in in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the big blind (BB) folds 85% and calls 15%. Always call: TT+, 77, AQs+, AQo+.

Always fold
A6s, A2s, K8s, K2s-K6s, Q7s-Q8s, Q2s-Q5s, J3s, 52s, 43s, A2o-AJo, K8o+, K3o-K4o, Q9o+, Q5o
Always call
TT+, 77, AQs+, AQo+
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.