PokerSolver
PokerSolver/Heads-up · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb/SB vs BB all-in

SB vs BB all-in

Heads-up · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb, BB goes all-in · Small blind / button to act

Heads-up · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bbChange game
Stacks (bb), if they differ
Pot 100.86bbYour cards?
20.7bb
79.84bb

Tap your two cards.

Small blind / button's range

594 of 1,326 combos get here
Fold 82.6%Call 17.4%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the small blind / button (SB) when SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb, BB goes all-in in Heads-up · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb at 80bb?

SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb, BB goes all-in in Heads-up · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb, 80bb: the small blind / button (SB) folds 82.6% and calls 17.4%. Always call: 77+, AJs+, KQs, AQo+.

Always fold
K2s, Q4s-Q5s, Q2s, J7s, J4s-J5s, J2s, T8s, T2s-T3s, 93s, 72s, A2o-ATo, K6o-KTo, K2o-K4o, Q8o-QTo, Q5o, J8o+, T7o+
Always call
77+, AJs+, KQs, AQo+
Settings: Heads-up · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 80bb stacks, 5% rake capped at 2bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 22.38). 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.