PokerSolver
PokerSolver/5-max · 200bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/SB vs CO 4-bet 20.7bb

SB vs CO 4-bet 20.7bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 200bb · CO opens 3bb, SB 3-bets to 9bb, CO 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
Tournament
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

244 of 1,326 combos get here
Fold 44.4%Call 43%Raise 45.54bb 12.5%All-in 199.84bb 0.1%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the small blind (SB) when CO opens 3bb, SB 3-bets to 9bb, CO 4-bets to 20.7bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 200bb?

CO opens 3bb, SB 3-bets to 9bb, CO 4-bets to 20.7bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 200bb: the small blind (SB) folds 44.4%, calls 43%, raises 45.54bb 12.5% and goes all-in 199.84bb 0.1%. Always call: TT-QQ, 44-88, AJs-AQs, T9s, 87s, 76s, 65s. Always raise 45.54bb: AA. Mixed: KK, 99, AKs, ATs, A8s, A4s-A5s, KJs+, QTs+, JTs, AKo.

Always fold
A6s-A7s, A3s, K7s-KTs, J9s, T8s, AJo-AQo, KJo+
Always call
TT-QQ, 44-88, AJs-AQs, T9s, 87s, 76s, 65s
Always raise 45.54bb
AA
Always all-in 199.84bb
No hand plays this every time
Mixed
KK, 99, AKs, ATs, A8s, A4s-A5s, KJs+, QTs+, JTs, AKo
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.

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.