PokerSolver
PokerSolver/5-max · 80bb · 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) · 80bb · CO opens 2.5bb · Big 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?
1bb
2.5bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 50.1%Call 39.1%Raise 5/7.5bb 10.8%
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 80bb?

CO opens 2.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 80bb: the big blind (BB) folds 50.1%, calls 39.1% and raises 5/7.5bb 10.8%. Always call: 99, 77, 22-55, A7s-ATs, A4s, A2s, K9s-KTs, K2s-K3s, Q9s-QTs, Q2s-Q7s, J9s, J2s-J6s, T7s, T3s-T5s, 95s+, 84s-86s, 73s-75s, 63s-64s, 52s-53s, 42s+, A9o-AJo, A6o-A7o, A4o, K8o-KJo, Q9o+, J9o, 87o. Always raise 5/7.5bb: JJ+, AQs+, A5s, KJs+, AKo. Mixed: TT, 88, 66, AJs, A6s, A3s, K4s-K8s, QJs, Q8s, JTs, J7s-J8s, T8s+, T6s, T2s, 87s, 76s, 65s, 54s, 32s, AQo, A8o, A5o, A3o, KQo, K7o, JTo, J8o, T8o+, 98o, 76o, 65o.

Always fold
92s-94s, 82s-83s, 72s, 62s, A2o, K2o-K6o, Q2o-Q8o, J2o-J7o, T2o-T7o, 92o-97o, 82o-86o, 72o-75o, 62o-64o, 52o+, 42o+, 32o
Always call
99, 77, 22-55, A7s-ATs, A4s, A2s, K9s-KTs, K2s-K3s, Q9s-QTs, Q2s-Q7s, J9s, J2s-J6s, T7s, T3s-T5s, 95s+, 84s-86s, 73s-75s, 63s-64s, 52s-53s, 42s+, A9o-AJo, A6o-A7o, A4o, K8o-KJo, Q9o+, J9o, 87o
Always raise 5/7.5bb
JJ+, AQs+, A5s, KJs+, AKo
Mixed
TT, 88, 66, AJs, A6s, A3s, K4s-K8s, QJs, Q8s, JTs, J7s-J8s, T8s+, T6s, T2s, 87s, 76s, 65s, 54s, 32s, AQo, A8o, A5o, A3o, KQo, K7o, JTo, J8o, T8o+, 98o, 76o, 65o
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.