PokerSolver
PokerSolver/4-max · 100bb · 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) · 100bb · BTN opens 3bb, SB 3-bets to 9bb, BTN 4-bets to 20.7bb · Small blind 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
4-max · 100bb · 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

346 of 1,326 combos get here
Fold 50.6%Call 31.8%All-in 99.84bb 17.6%
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 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

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, 100bb: the small blind (SB) folds 50.6%, calls 31.8% and goes all-in 99.84bb 17.6%. Always call: 88-99, 66, ATs-AQs, KJs+, Q9s+, 98s, 87s, 76s, 65s, 54s, AQo. Always all-in 99.84bb: JJ+, AKs, A3s-A4s, AKo. Mixed: TT, 77, 44-55, A5s-A8s, A2s, KQo.

Always fold
K5s-KTs, J7s+, T7s+, ATo-AJo, KTo-KJo, QJo, JTo
Always call
88-99, 66, ATs-AQs, KJs+, Q9s+, 98s, 87s, 76s, 65s, 54s, AQo
Always all-in 99.84bb
JJ+, AKs, A3s-A4s, AKo
Mixed
TT, 77, 44-55, A5s-A8s, A2s, KQo
Settings: 4-max · 100bb · 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, 100bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.66). 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.