PokerSolver
PokerSolver/4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/SB vs BB 4-bet 20.7bb

SB vs BB 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 · SB limps, BB isolates to 3bb, SB 3-bets to 9bb, BB 4-bets to 20.7bb · Small blind to act

4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 30.34bbYour cards?
9bb
20.7bb

Tap your two cards.

Small blind's range

622 of 1,326 combos get here
Fold 70.1%Call 16.6%All-in 99.84bb 13.3%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the small blind (SB) when SB limps, BB isolates to 3bb, SB 3-bets to 9bb, BB 4-bets to 20.7bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

SB limps, BB isolates to 3bb, SB 3-bets to 9bb, BB 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 70.1%, calls 16.6% and goes all-in 99.84bb 13.3%. Always call: 88, 55-66, ATs-AQs, KTs+, QJs, T9s, 98s, 76s, AQo. Always all-in 99.84bb: JJ+, 77, AKs, A5s, A2s, AKo. Mixed: 99-TT, A9s, A6s-A7s, A3s-A4s, T8s, 86s+, 75s, 54s.

Always fold
K9s, K7s, K2s-K4s, Q8s, Q6s, Q2s, J6s-J8s, J3s-J4s, T5s-T7s, 95s-97s, 85s, 64s, 53s, 43s, ATo-AJo, A7o, A5o, A3o, K7o+, QTo+, J9o+, T8o+, 98o
Always call
88, 55-66, ATs-AQs, KTs+, QJs, T9s, 98s, 76s, AQo
Always all-in 99.84bb
JJ+, 77, AKs, A5s, A2s, AKo
Mixed
99-TT, A9s, A6s-A7s, A3s-A4s, T8s, 86s+, 75s, 54s
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.

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.