PokerSolver
PokerSolver/5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/SB vs CO 3-bet 4bb

SB vs CO 3-bet 4bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO limps, SB isolates to 2bb, CO 3-bets to 4bb · Small blind to act

5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 7.8bbYour cards?
2bb
1bb
4bb

Tap your two cards.

Small blind's range

364 of 1,326 combos get here
Fold 23%Call 54.7%Raise 9.2bb 11.5%All-in 99.84bb 10.9%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the small blind (SB) when CO limps, SB isolates to 2bb, CO 3-bets to 4bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 100bb?

CO limps, SB isolates to 2bb, CO 3-bets to 4bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 100bb: the small blind (SB) folds 23%, calls 54.7%, raises 9.2bb 11.5% and goes all-in 99.84bb 10.9%. Always call: TT, 55-88, ATs, KJs+, 87s. Always all-in 99.84bb: AKs, AKo. Mixed: JJ+, 99, AJs-AQs, A7s-A9s, A2s-A5s, K4s-KTs, Q8s+, Q5s, J8s+, T7s+, 97s+, 75s+, 64s+, 53s+, ATo-AQo, KTo+, QTo, JTo.

Always fold
Q7s, 86s
Always call
TT, 55-88, ATs, KJs+, 87s
Always raise 9.2bb
No hand plays this every time
Always all-in 99.84bb
AKs, AKo
Mixed
JJ+, 99, AJs-AQs, A7s-A9s, A2s-A5s, K4s-KTs, Q8s+, Q5s, J8s+, T7s+, 97s+, 75s+, 64s+, 53s+, ATo-AQo, KTo+, QTo, JTo
Settings: 5-max · 100bb · 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, 100bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 23.9). 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.