PokerSolver
PokerSolver/4-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/SB vs CO 3-bet 4bb

SB vs CO 3-bet 4bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 150bb · CO limps, SB isolates to 2bb, CO 3-bets to 4bb · Small blind to act

4-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 7.64bbYour cards?
2bb
1bb
4bb

Tap your two cards.

Small blind's range

472 of 1,326 combos get here
Fold 28%Call 55.9%Raise 9.2bb 8.7%All-in 149.84bb 7.4%
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 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 150bb?

CO limps, SB isolates to 2bb, CO 3-bets to 4bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 150bb: the small blind (SB) folds 28%, calls 55.9%, raises 9.2bb 8.7% and goes all-in 149.84bb 7.4%. Always call: TT-JJ, 77, 33-55, A7s-A9s, 76s, 53s. Mixed: QQ+, 88-99, 66, ATs+, A3s-A6s, K6s+, K4s, K2s, Q8s+, Q6s, Q2s, J8s+, T6s+, 96s+, 86s+, 75s, 64s+, 54s, ATo+, A8o, KQo, KTo, QTo+, JTo, T9o, 65o.

Always fold
Q5s
Always call
TT-JJ, 77, 33-55, A7s-A9s, 76s, 53s
Always raise 9.2bb
No hand plays this every time
Always all-in 149.84bb
No hand plays this every time
Mixed
QQ+, 88-99, 66, ATs+, A3s-A6s, K6s+, K4s, K2s, Q8s+, Q6s, Q2s, J8s+, T6s+, 96s+, 86s+, 75s, 64s+, 54s, ATo+, A8o, KQo, KTo, QTo+, JTo, T9o, 65o
Settings: 4-max · 150bb · 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, 150bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.5). 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.