PokerSolver
PokerSolver/4-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs CO open 2.5bb

BB 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) · 250bb · CO opens 2.5bb · Big blind to act

4-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 4.64bbYour cards?
1bb
2.5bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 58.3%Call 32.3%Raise 5/7.5bb 9.4%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO opens 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 250bb?

CO opens 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 250bb: the big blind (BB) folds 58.3%, calls 32.3% and raises 5/7.5bb 9.4%. Always call: 22-33, A6s, A2s, K7s, K2s-K5s, Q2s-Q9s, J3s-J7s, T6s-T7s, 97s+, 84s+, 74s-75s, 63s, 52s-53s, 43s, A8o-AQo, A5o, K9o+, QTo+, JTo, T9o. Always raise 5/7.5bb: JJ+, AJs+, A8s, KQs, K9s, QTs+, JTs. Mixed: 44-TT, A9s-ATs, A7s, A3s-A5s, KTs-KJs, K8s, K6s, J8s-J9s, T8s+, T4s-T5s, 95s-96s, 76s, 64s+, 54s, 42s, AKo, A7o, Q9o, J9o, 98o, 87o, 76o, 65o.

Always fold
J2s, T2s-T3s, 92s-94s, 82s-83s, 72s-73s, 62s, 32s, A6o, A2o-A4o, K2o-K8o, Q2o-Q8o, J2o-J8o, T2o-T8o, 92o-97o, 82o-86o, 72o-75o, 62o-64o, 52o+, 42o+, 32o
Always call
22-33, A6s, A2s, K7s, K2s-K5s, Q2s-Q9s, J3s-J7s, T6s-T7s, 97s+, 84s+, 74s-75s, 63s, 52s-53s, 43s, A8o-AQo, A5o, K9o+, QTo+, JTo, T9o
Always raise 5/7.5bb
JJ+, AJs+, A8s, KQs, K9s, QTs+, JTs
Mixed
44-TT, A9s-ATs, A7s, A3s-A5s, KTs-KJs, K8s, K6s, J8s-J9s, T8s+, T4s-T5s, 95s-96s, 76s, 64s+, 54s, 42s, AKo, A7o, Q9o, J9o, 98o, 87o, 76o, 65o
Settings: 4-max · 250bb · 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, 250bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.91). 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.