PokerSolver
PokerSolver/4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/SB vs CO open 2.5bb

SB vs CO open 2.5bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · CO opens 2.5bb · 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 4.64bbYour cards?
0.5bb
1bb
2.5bb

Tap your two cards.

Small blind's range

1,326 of 1,326 combos get here
Fold 81.9%Call 6.2%Raise 5/7.5bb 11.9%
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 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

CO opens 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the small blind (SB) folds 81.9%, calls 6.2% and raises 5/7.5bb 11.9%. Always call: 77, 44, A9s, Q9s. Always raise 5/7.5bb: JJ+, 66, AJs+, A8s, A4s, KQs, KTs, J9s+, T8s, AKo. Mixed: 88-TT, 55, ATs, A5s-A7s, A2s-A3s, KJs, K6s-K9s, QTs+, J8s, T9s, 87s, 76s, 65s, ATo-AQo, KJo+.

Always fold
22-33, K2s-K5s, Q2s-Q8s, J2s-J7s, T2s-T7s, 92s+, 82s-86s, 72s-75s, 62s-64s, 52s+, 42s+, 32s, A2o-A9o, K2o-KTo, Q2o+, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
77, 44, A9s, Q9s
Always raise 5/7.5bb
JJ+, 66, AJs+, A8s, A4s, KQs, KTs, J9s+, T8s, AKo
Mixed
88-TT, 55, ATs, A5s-A7s, A2s-A3s, KJs, K6s-K9s, QTs+, J8s, T9s, 87s, 76s, 65s, ATo-AQo, KJo+
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.