PokerSolver
PokerSolver/5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs CO open 2.5bb

BB vs CO open 2.5bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO opens 2.5bb · Big blind to act

5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 4.8bbYour cards?
1bb
2.5bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 51.3%Call 37.9%Raise 5/7.5bb 10.9%
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 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 100bb?

CO opens 2.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 100bb: the big blind (BB) folds 51.3%, calls 37.9% and raises 5/7.5bb 10.9%. Always call: 99, 77, 22-55, A9s-ATs, K7s, K2s-K3s, QTs, Q2s-Q7s, J2s-J7s, T4s-T5s, 95s-97s, 84s+, 74s, 63s-64s, 52s-53s, 42s+, A9o-AJo, A7o, A4o, K9o-KJo, Q9o+, J9o, T9o, 87o. Always raise 5/7.5bb: JJ+, AQs+, A5s, KQs, T9s, AKo. Mixed: TT, 88, 66, AJs, A6s-A8s, A2s-A4s, K8s-KJs, K4s-K6s, QJs, Q8s-Q9s, J8s+, T6s-T8s, T3s, 98s, 75s+, 73s, 65s, 54s, AQo, A8o, A5o-A6o, KQo, K7o-K8o, JTo, T8o, 98o, 76o, 65o.

Always fold
T2s, 92s-94s, 82s-83s, 72s, 62s, 32s, A2o-A3o, K2o-K6o, Q2o-Q8o, J2o-J8o, T2o-T7o, 92o-97o, 82o-86o, 72o-75o, 62o-64o, 52o+, 42o+, 32o
Always call
99, 77, 22-55, A9s-ATs, K7s, K2s-K3s, QTs, Q2s-Q7s, J2s-J7s, T4s-T5s, 95s-97s, 84s+, 74s, 63s-64s, 52s-53s, 42s+, A9o-AJo, A7o, A4o, K9o-KJo, Q9o+, J9o, T9o, 87o
Always raise 5/7.5bb
JJ+, AQs+, A5s, KQs, T9s, AKo
Mixed
TT, 88, 66, AJs, A6s-A8s, A2s-A4s, K8s-KJs, K4s-K6s, QJs, Q8s-Q9s, J8s+, T6s-T8s, T3s, 98s, 75s+, 73s, 65s, 54s, AQo, A8o, A5o-A6o, KQo, K7o-K8o, JTo, T8o, 98o, 76o, 65o
Settings: 5-max · 100bb · 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, 100bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 23.9). 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.