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

SB vs BTN 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 opens 2bb, BTN 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 8.14bbYour cards?
0.5bb
1bb
2bb
4bb

Tap your two cards.

Small blind's range

1,326 of 1,326 combos get here
Fold 92.5%Call 2.4%Raise 9.2bb 3.2%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 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 150bb?

CO opens 2bb, BTN 3-bets to 4bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 150bb: the small blind (SB) folds 92.5%, calls 2.4%, raises 9.2bb 3.2% and goes all-in 149.84bb 1.9%. Always raise 9.2bb: AA. Mixed: 55-KK, 33, A8s+, A4s-A5s, KJs+, K9s, QJs, Q5s, J9s+, 87s, AQo+.

Always fold
44, 22, A6s-A7s, A2s-A3s, KTs, K2s-K8s, Q6s-QTs, Q2s-Q4s, J2s-J8s, T2s+, 92s+, 82s-86s, 72s+, 62s+, 52s+, 42s+, 32s, A2o-AJo, K2o+, Q2o+, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
No hand plays this every time
Always raise 9.2bb
AA
Always all-in 149.84bb
No hand plays this every time
Mixed
55-KK, 33, A8s+, A4s-A5s, KJs+, K9s, QJs, Q5s, J9s+, 87s, AQo+
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.