PokerSolver
PokerSolver/5-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/SB vs BTN 3-bet 4bb

SB vs BTN 3-bet 4bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 150bb · CO opens 2bb, BTN 3-bets to 4bb · Small blind to act

5-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 8.3bbYour cards?
0.5bb
1bb
2bb
4bb

Tap your two cards.

Small blind's range

1,326 of 1,326 combos get here
Fold 92.4%Call 2.7%Raise 9.2bb 2.9%All-in 149.84bb 1.9%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the small blind (SB) when CO opens 2bb, BTN 3-bets to 4bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 150bb?

CO opens 2bb, BTN 3-bets to 4bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 150bb: the small blind (SB) folds 92.4%, calls 2.7%, raises 9.2bb 2.9% and goes all-in 149.84bb 1.9%. Mixed: 66+, 33, ATs+, A8s, A5s-A6s, A2s, KTs+, QJs, T8s, 87s, AQo+, KQo.

Always fold
44-55, 22, A9s, A7s, A3s-A4s, K2s-K9s, Q2s-QTs, J2s+, T9s, T2s-T7s, 92s+, 82s-86s, 72s+, 62s+, 52s+, 42s+, 32s, A2o-AJo, K2o-KJo, Q2o+, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
No hand plays this every time
Always raise 9.2bb
No hand plays this every time
Always all-in 149.84bb
No hand plays this every time
Mixed
66+, 33, ATs+, A8s, A5s-A6s, A2s, KTs+, QJs, T8s, 87s, AQo+, KQo
Settings: 5-max · 150bb · 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, 150bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.89). 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.