PokerSolver
PokerSolver/4-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/SB vs BTN 4-bet 20.7bb

SB vs BTN 4-bet 20.7bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (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

4-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 31.34bbYour cards?
9bb
1bb
20.7bb

Tap your two cards.

Small blind's range

358 of 1,326 combos get here
Fold 44.9%Call 45%All-in 149.84bb 10.1%
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 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 150bb?

BTN opens 3bb, SB 3-bets to 9bb, BTN 4-bets to 20.7bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 150bb: the small blind (SB) folds 44.9%, calls 45% and goes all-in 149.84bb 10.1%. Always call: 22-JJ, A8s-AQs, KTs+, QJs, JTs, 98s, 87s, 76s, 65s, 54s, AQo. Always all-in 149.84bb: KK+, AKo. Mixed: QQ, AKs, A2s-A7s, K8s-K9s, K6s, Q9s-QTs, J9s, T8s+.

Always fold
K7s, K4s-K5s, Q7s, J8s, T7s, ATo-AJo, KTo+, QTo+, JTo
Always call
22-JJ, A8s-AQs, KTs+, QJs, JTs, 98s, 87s, 76s, 65s, 54s, AQo
Always all-in 149.84bb
KK+, AKo
Mixed
QQ, AKs, A2s-A7s, K8s-K9s, K6s, Q9s-QTs, J9s, T8s+
Settings: 4-max · 150bb · 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, 150bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.5). 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.