PokerSolver
PokerSolver/6-max · 40bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/SB vs BTN 3-bet 4bb

SB vs BTN 3-bet 4bb

6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 40bb · CO opens 2bb, BTN 3-bets to 4bb · Small blind to act

6-max · 40bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 8.46bbYour cards?
0.5bb
1bb
2bb
4bb

Tap your two cards.

Small blind's range

1,326 of 1,326 combos get here
Fold 90.6%Call 1.5%Raise 9.2bb 3.3%All-in 39.84bb 4.6%
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 2bb, BTN 3-bets to 4bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 40bb?

CO opens 2bb, BTN 3-bets to 4bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 40bb: the small blind (SB) folds 90.6%, calls 1.5%, raises 9.2bb 3.3% and goes all-in 39.84bb 4.6%. Always raise 9.2bb: KK. Always all-in 39.84bb: AKo. Mixed: AA, 44-QQ, A8s+, A4s-A6s, KTs+, K5s, J9s+, T7s, 75s+, ATo-AQo, KJo+.

Always fold
22-33, A7s, A2s-A3s, K6s-K9s, K2s-K4s, Q2s+, J2s-J8s, T8s+, T2s-T6s, 92s+, 82s+, 72s-74s, 62s+, 52s+, 42s+, 32s, A2o-A9o, K2o-KTo, Q2o+, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
No hand plays this every time
Always raise 9.2bb
KK
Always all-in 39.84bb
AKo
Mixed
AA, 44-QQ, A8s+, A4s-A6s, KTs+, K5s, J9s+, T7s, 75s+, ATo-AQo, KJo+
Settings: 6-max · 40bb · 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, 40bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.93). 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.