PokerSolver
PokerSolver/4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/SB vs CO open 2bb

SB vs CO open 2bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · CO opens 2bb · Small blind to act

4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 4.14bbYour cards?
0.5bb
1bb
2bb

Tap your two cards.

Small blind's range

1,326 of 1,326 combos get here
Fold 77.7%Call 11.8%Raise 4/6bb 10.4%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the small blind (SB) when CO opens 2bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

CO opens 2bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the small blind (SB) folds 77.7%, calls 11.8% and raises 4/6bb 10.4%. Always call: 33-44, A2s, Q9s, ATo, QJo. Always raise 4/6bb: QQ+, AJs+, KQs, QJs, J9s+, AKo. Mixed: 55-JJ, 22, A3s-ATs, K4s-KJs, QTs, J8s, T8s+, 97s+, 87s, 76s, 65s, AJo-AQo, KTo+, QTo, JTo.

Always fold
K2s-K3s, Q2s-Q8s, J2s-J7s, T2s-T7s, 92s-96s, 82s-86s, 72s-75s, 62s-64s, 52s+, 42s+, 32s, A2o-A9o, K2o-K9o, Q2o-Q9o, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
33-44, A2s, Q9s, ATo, QJo
Always raise 4/6bb
QQ+, AJs+, KQs, QJs, J9s+, AKo
Mixed
55-JJ, 22, A3s-ATs, K4s-KJs, QTs, J8s, T8s+, 97s+, 87s, 76s, 65s, AJo-AQo, KTo+, QTo, JTo
Settings: 4-max · 80bb · 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, 80bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.98). 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.