PokerSolver
PokerSolver/4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/SB vs BB all-in

SB vs BB all-in

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb, BB goes all-in · Small blind to act

4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 121.18bbYour cards?
20.7bb
99.84bb

Tap your two cards.

Small blind's range

454 of 1,326 combos get here
Fold 83.7%Call 16.3%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the small blind (SB) when SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb, BB goes all-in in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb, BB goes all-in in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the small blind (SB) folds 83.7% and calls 16.3%. Always call: 99+, AQs+, AKo. Mixed: 88, AQo.

Always fold
A2s-A9s, K9s, K4s-K7s, Q8s-QTs, Q6s, Q2s, J7s-J9s, J3s, T8s+, T5s, 96s+, 86s+, 75s+, 64s+, 43s, A8o-AJo, A4o-A5o, KTo+, QTo+, JTo, T9o
Always call
99+, AQs+, AKo
Mixed
88, AQo
Settings: 4-max · 100bb · 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, 100bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.66). 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.