PokerSolver
PokerSolver/5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/SB vs CO 4-bet 11.5bb

SB vs CO 4-bet 11.5bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 250bb · CO opens 2.5bb, SB 3-bets to 5bb, CO 4-bets to 11.5bb · Small blind to act

5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 18.3bbYour cards?
5bb
1bb
11.5bb

Tap your two cards.

Small blind's range

204 of 1,326 combos get here
Fold 20.7%Call 67.4%Raise 25.3bb 9.3%All-in 249.84bb 2.6%
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 2.5bb, SB 3-bets to 5bb, CO 4-bets to 11.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 250bb?

CO opens 2.5bb, SB 3-bets to 5bb, CO 4-bets to 11.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 250bb: the small blind (SB) folds 20.7%, calls 67.4%, raises 25.3bb 9.3% and goes all-in 249.84bb 2.6%. Always call: JJ, 44-99, AJs-AQs, KQs, 76s, 65s. Always raise 25.3bb: AA, AKs. Mixed: QQ-KK, TT, A9s-ATs, A3s-A5s, KTs-KJs, QTs+, JTs, T9s, 87s, AQo+.

Always fold
KQo
Always call
JJ, 44-99, AJs-AQs, KQs, 76s, 65s
Always raise 25.3bb
AA, AKs
Always all-in 249.84bb
No hand plays this every time
Mixed
QQ-KK, TT, A9s-ATs, A3s-A5s, KTs-KJs, QTs+, JTs, T9s, 87s, AQo+
Settings: 5-max · 250bb · 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, 250bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.98). 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.