PokerSolver
PokerSolver/4-max · 100bb · 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) · 100bb · CO limps, SB isolates to 2bb, CO 3-bets to 4bb · 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 7.64bbYour cards?
2bb
1bb
4bb

Tap your two cards.

Small blind's range

416 of 1,326 combos get here
Fold 36.2%Call 42.1%Raise 9.2bb 12.5%All-in 99.84bb 9.2%
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 100bb?

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, 100bb: the small blind (SB) folds 36.2%, calls 42.1%, raises 9.2bb 12.5% and goes all-in 99.84bb 9.2%. Always call: 44-66, 22, AJs, A3s, 98s, 75s, 54s. Mixed: 77+, AQs+, A4s-ATs, A2s, K7s+, K5s, K2s, Q9s+, Q5s-Q6s, J8s+, T7s+, 96s-97s, 76s, 64s+, 53s, ATo+, A5o, KQo, KTo, QTo+, JTo.

Always fold
86s+
Always call
44-66, 22, AJs, A3s, 98s, 75s, 54s
Always raise 9.2bb
No hand plays this every time
Always all-in 99.84bb
No hand plays this every time
Mixed
77+, AQs+, A4s-ATs, A2s, K7s+, K5s, K2s, Q9s+, Q5s-Q6s, J8s+, T7s+, 96s-97s, 76s, 64s+, 53s, ATo+, A5o, KQo, KTo, QTo+, JTo
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.