PokerSolver
PokerSolver/Heads-up · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb/SB vs BB 4-bet 20.7bb

SB vs BB 4-bet 20.7bb

Heads-up · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · SB limps, BB isolates to 3bb, SB 3-bets to 9bb, BB 4-bets to 20.7bb · Small blind / button to act

Fits exactlyno game we have checked
Close1 games
  • CoinPoker cash with antes NL50rake before the flop in 3-bet pots there, none here
Heads-up · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bbChange game
Stacks (bb), if they differ
Pot 30.02bbYour cards?
9bb
20.7bb

Tap your two cards.

Small blind / button's range

606 of 1,326 combos get here
Fold 43.9%Call 46.9%All-in 99.84bb 9.2%
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 limps, BB isolates to 3bb, SB 3-bets to 9bb, BB 4-bets to 20.7bb in Heads-up · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb at 100bb?

SB limps, BB isolates to 3bb, SB 3-bets to 9bb, BB 4-bets to 20.7bb in Heads-up · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb, 100bb: the small blind / button (SB) folds 43.9%, calls 46.9% and goes all-in 99.84bb 9.2%. Always call: KK+, 66-77, AQs, K2s-K4s, Q6s, Q3s, 96s-97s, 85s-86s, 64s, 52s, ATo-AJo, KJo+, QTo, J9o, 76o. Always all-in 99.84bb: TT, AKo. Mixed: JJ-QQ, 88-99, T4s, 93s-94s, AQo, A4o, K8o-K9o, QJo, 98o, 54o.

Always fold
T3s, A6o, A2o-A3o, K4o-K6o, Q6o-Q8o, J8o, T7o-T8o, 97o
Always call
KK+, 66-77, AQs, K2s-K4s, Q6s, Q3s, 96s-97s, 85s-86s, 64s, 52s, ATo-AJo, KJo+, QTo, J9o, 76o
Always all-in 99.84bb
TT, AKo
Mixed
JJ-QQ, 88-99, T4s, 93s-94s, AQo, A4o, K8o-K9o, QJo, 98o, 54o
Settings: Heads-up · 100bb · 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, 100bb stacks, 5% rake capped at 2bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 8.9). 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.

Rake sources for the games it fits: 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.