PokerSolver
PokerSolver/5-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/SB vs BTN 4-bet 20.7bb

SB vs BTN 4-bet 20.7bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 150bb · BTN opens 3bb, SB 3-bets to 9bb, BTN 4-bets to 20.7bb · Small blind to act

5-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 31.5bbYour cards?
9bb
1bb
20.7bb

Tap your two cards.

Small blind's range

346 of 1,326 combos get here
Fold 43.5%Call 44.9%All-in 149.84bb 11.6%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the small blind (SB) when BTN opens 3bb, SB 3-bets to 9bb, BTN 4-bets to 20.7bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 150bb?

BTN opens 3bb, SB 3-bets to 9bb, BTN 4-bets to 20.7bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 150bb: the small blind (SB) folds 43.5%, calls 44.9% and goes all-in 149.84bb 11.6%. Always call: 33-QQ, A8s-AQs, KTs+, QJs, 98s, 87s, 76s, 65s, 54s, AQo. Always all-in 149.84bb: KK+, AKs, A3s, AKo. Mixed: A7s, A4s-A5s, A2s, K9s, K6s, QTs, J9s+, T8s+.

Always fold
A6s, K7s-K8s, K5s, Q9s, Q6s, 97s, ATo-AJo, KTo+, QJo, JTo
Always call
33-QQ, A8s-AQs, KTs+, QJs, 98s, 87s, 76s, 65s, 54s, AQo
Always all-in 149.84bb
KK+, AKs, A3s, AKo
Mixed
A7s, A4s-A5s, A2s, K9s, K6s, QTs, J9s+, T8s+
Settings: 5-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 150bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.89). 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.