PokerSolver
PokerSolver/4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs CO open 2bb

BB vs CO open 2bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · CO opens 2bb · 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 4.14bbYour cards?
1bb
2bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 31.5%Call 58.2%Raise 4/6bb 10.3%
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 2bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

CO opens 2bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the big blind (BB) folds 31.5%, calls 58.2% and raises 4/6bb 10.3%. Always call: 22-55, A9s, K2s-K7s, Q2s-Q8s, J5s-J7s, J2s-J3s, T7s, T2s-T5s, 92s-97s, 82s-86s, 72s-74s, 62s-64s, 52s-53s, 42s+, A2o-AJo, KQo, K4o-K9o, Q6o+, J8o+, T7o+, 97o+, 86o+, 75o+. Always raise 4/6bb: JJ+, AQs+, KJs+, J9s+, AKo. Mixed: 66-TT, ATs-AJs, A2s-A8s, K8s-KTs, Q9s+, J8s, J4s, T8s+, T6s, 98s, 87s, 75s+, 65s, 54s, 32s, AQo, KTo-KJo, Q4o-Q5o, J7o, 85o, 64o+, 53o+.

Always fold
K2o-K3o, Q2o-Q3o, J2o-J6o, T2o-T6o, 92o-96o, 82o-84o, 72o-74o, 62o-63o, 52o, 42o+, 32o
Always call
22-55, A9s, K2s-K7s, Q2s-Q8s, J5s-J7s, J2s-J3s, T7s, T2s-T5s, 92s-97s, 82s-86s, 72s-74s, 62s-64s, 52s-53s, 42s+, A2o-AJo, KQo, K4o-K9o, Q6o+, J8o+, T7o+, 97o+, 86o+, 75o+
Always raise 4/6bb
JJ+, AQs+, KJs+, J9s+, AKo
Mixed
66-TT, ATs-AJs, A2s-A8s, K8s-KTs, Q9s+, J8s, J4s, T8s+, T6s, 98s, 87s, 75s+, 65s, 54s, 32s, AQo, KTo-KJo, Q4o-Q5o, J7o, 85o, 64o+, 53o+
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.