PokerSolver
PokerSolver/5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/SB vs BTN open 2.5bb

SB vs BTN open 2.5bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · BTN opens 2.5bb · Small blind to act

5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 4.8bbYour cards?
0.5bb
1bb
2.5bb

Tap your two cards.

Small blind's range

1,326 of 1,326 combos get here
Fold 78.9%Call 4.1%Raise 5/7.5bb 17%
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 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 80bb?

BTN opens 2.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 80bb: the small blind (SB) folds 78.9%, calls 4.1% and raises 5/7.5bb 17%. Always call: 44, A8s. Always raise 5/7.5bb: TT+, ATs+, A4s-A5s, KJs+, K9s, QJs, JTs, T8s+, 98s, ATo+, KQo. Mixed: 55-99, A9s, A6s-A7s, A2s-A3s, KTs, K5s-K8s, Q8s-QTs, J9s, T7s, 97s, 76s, 65s, 54s, A9o, KTo-KJo, QTo+, JTo.

Always fold
22-33, K2s-K4s, Q2s-Q7s, J2s-J8s, T2s-T6s, 92s-96s, 82s+, 72s-75s, 62s-64s, 52s-53s, 42s+, 32s, A2o-A8o, K2o-K9o, Q2o-Q9o, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
44, A8s
Always raise 5/7.5bb
TT+, ATs+, A4s-A5s, KJs+, K9s, QJs, JTs, T8s+, 98s, ATo+, KQo
Mixed
55-99, A9s, A6s-A7s, A2s-A3s, KTs, K5s-K8s, Q8s-QTs, J9s, T7s, 97s, 76s, 65s, 54s, A9o, KTo-KJo, QTo+, JTo
Settings: 5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 80bb stacks, 5% rake capped at 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.