PokerSolver
PokerSolver/4-max · 200bb · 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) · 200bb · BTN opens 2.5bb · Small blind to act

4-max · 200bb · 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 78.6%Call 6.6%Raise 5/7.5bb 14.8%
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 200bb?

BTN opens 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 200bb: the small blind (SB) folds 78.6%, calls 6.6% and raises 5/7.5bb 14.8%. Always call: A2s, KJo. Always raise 5/7.5bb: KK+, 99, 77, 55, ATs+, A7s, A5s, A3s, K9s+, QTs+, JTs, T9s, KQo. Mixed: TT-QQ, 88, 66, 33-44, A8s-A9s, A6s, A4s, K4s-K8s, Q8s-Q9s, J9s, T8s, 97s+, 87s, 76s, 65s, 54s, A9o+, KTo, QTo+.

Always fold
22, K2s-K3s, Q2s-Q7s, J2s-J8s, T2s-T7s, 92s-96s, 82s-86s, 72s-75s, 62s-64s, 52s-53s, 42s+, 32s, A2o-A8o, K2o-K9o, Q2o-Q9o, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
A2s, KJo
Always raise 5/7.5bb
KK+, 99, 77, 55, ATs+, A7s, A5s, A3s, K9s+, QTs+, JTs, T9s, KQo
Mixed
TT-QQ, 88, 66, 33-44, A8s-A9s, A6s, A4s, K4s-K8s, Q8s-Q9s, J9s, T8s, 97s+, 87s, 76s, 65s, 54s, A9o+, KTo, QTo+
Settings: 4-max · 200bb · 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, 200bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.95). 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.