PokerSolver
PokerSolver/4-max · 80bb · 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) · 80bb · CO opens 2.5bb · Big blind to act

4-max · 80bb · 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 53.3%Call 35.7%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 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

CO opens 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the big blind (BB) folds 53.3%, calls 35.7% and raises 5/7.5bb 10.9%. Always call: 99, 77, 22-55, A8s-ATs, A6s, A2s, K2s-K5s, Q2s-QTs, J6s, J2s-J4s, T5s, T3s, 95s+, 84s-86s, 74s, 63s-64s, 52s-53s, 43s, A9o-AJo, A7o, K9o-KJo, QTo+, J9o, 87o. Always raise 5/7.5bb: TT+, AQs+, KQs, K8s, JTs, AKo. Mixed: 88, 66, AJs, A7s, A3s-A5s, K9s-KJs, K6s-K7s, QJs, J7s-J9s, J5s, T6s+, T4s, 87s, 75s+, 73s, 65s, 54s, 42s, AQo, A8o, A4o-A6o, KQo, K8o, Q9o, JTo, T8o+, 98o, 76o, 65o.

Always fold
T2s, 92s-94s, 82s-83s, 72s, 62s, 32s, A2o-A3o, K2o-K7o, Q2o-Q8o, J2o-J8o, T2o-T7o, 92o-97o, 82o-86o, 72o-75o, 62o-64o, 52o+, 42o+, 32o
Always call
99, 77, 22-55, A8s-ATs, A6s, A2s, K2s-K5s, Q2s-QTs, J6s, J2s-J4s, T5s, T3s, 95s+, 84s-86s, 74s, 63s-64s, 52s-53s, 43s, A9o-AJo, A7o, K9o-KJo, QTo+, J9o, 87o
Always raise 5/7.5bb
TT+, AQs+, KQs, K8s, JTs, AKo
Mixed
88, 66, AJs, A7s, A3s-A5s, K9s-KJs, K6s-K7s, QJs, J7s-J9s, J5s, T6s+, T4s, 87s, 75s+, 73s, 65s, 54s, 42s, AQo, A8o, A4o-A6o, KQo, K8o, Q9o, JTo, T8o+, 98o, 76o, 65o
Settings: 4-max · 80bb · 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, 80bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.98). 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.