PokerSolver
PokerSolver/4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/SB vs BTN open 2.5bb

SB vs BTN open 2.5bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · BTN opens 2.5bb · Small blind to act

4-max · 100bb · 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 79%Call 4.6%Raise 5/7.5bb 16.4%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the small blind (SB) when BTN opens 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

BTN opens 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the small blind (SB) folds 79%, calls 4.6% and raises 5/7.5bb 16.4%. Always call: 44, A8s. Always raise 5/7.5bb: JJ+, 88, 55-66, ATs+, A4s-A5s, KTs+, QTs+, JTs, T9s, 98s, AKo, AJo, KQo. Mixed: 99-TT, 77, 33, A9s, A6s-A7s, A2s-A3s, K5s-K9s, Q8s-Q9s, J8s-J9s, T7s-T8s, 97s, 76s, 65s, AQo, ATo, KTo-KJo, QJo, JTo.

Always fold
22, K2s-K4s, Q2s-Q7s, J2s-J7s, T2s-T6s, 92s-96s, 82s+, 72s-75s, 62s-64s, 52s+, 42s+, 32s, A2o-A9o, K2o-K9o, Q2o-QTo, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
44, A8s
Always raise 5/7.5bb
JJ+, 88, 55-66, ATs+, A4s-A5s, KTs+, QTs+, JTs, T9s, 98s, AKo, AJo, KQo
Mixed
99-TT, 77, 33, A9s, A6s-A7s, A2s-A3s, K5s-K9s, Q8s-Q9s, J8s-J9s, T7s-T8s, 97s, 76s, 65s, AQo, ATo, KTo-KJo, QJo, JTo
Settings: 4-max · 100bb · 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, 100bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.66). 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.