PokerSolver
PokerSolver/5-max · 200bb · 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) · 200bb · BTN opens 3bb, SB 3-bets to 9bb, BTN 4-bets to 20.7bb · Small blind to act

5-max · 200bb · 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

318 of 1,326 combos get here
Fold 38.3%Call 43.7%Raise 45.54bb 12.8%All-in 199.84bb 5.2%
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 200bb?

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, 200bb: the small blind (SB) folds 38.3%, calls 43.7%, raises 45.54bb 12.8% and goes all-in 199.84bb 5.2%. Always call: 33-JJ, A9s-AQs, A5s, KJs+, QTs+, 87s, 76s, 65s, 54s. Always raise 45.54bb: AA, AKs, K5s-K6s. Always all-in 199.84bb: AKo. Mixed: QQ-KK, A6s-A8s, A2s-A4s, KTs, K7s-K8s, J9s+, T9s, 98s, AQo.

Always fold
K9s, Q9s, T8s, ATo-AJo, KJo+, QJo
Always call
33-JJ, A9s-AQs, A5s, KJs+, QTs+, 87s, 76s, 65s, 54s
Always raise 45.54bb
AA, AKs, K5s-K6s
Always all-in 199.84bb
AKo
Mixed
QQ-KK, A6s-A8s, A2s-A4s, KTs, K7s-K8s, J9s+, T9s, 98s, AQo
Settings: 5-max · 200bb · 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, 200bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.99). 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.