PokerSolver
PokerSolver/4-max · 100bb · 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) · 100bb · CO opens 2.5bb · Big blind to act

Fits exactlyno game we have checked
Close1 games
  • CoinPoker cash with antes NL50rake before the flop in 3-bet pots there, none here
4-max · 100bb · 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 55.3%Call 33.5%Raise 5/7.5bb 11.2%
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 100bb?

CO opens 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the big blind (BB) folds 55.3%, calls 33.5% and raises 5/7.5bb 11.2%. Always call: 22-44, A9s-ATs, K6s, K2s-K4s, Q9s, Q2s-Q7s, J2s-J6s, 96s-97s, 84s-85s, 74s-75s, 63s-64s, 52s-53s, 43s, A7o-AJo, A5o, K9o-KJo, QTo+, T9o, 87o. Always raise 5/7.5bb: JJ+, AQs+, A5s, KJs+, QJs, T9s, AKo. Mixed: 55-TT, AJs, A6s-A8s, A2s-A4s, K7s-KTs, K5s, QTs, Q8s, J7s+, T4s-T8s, 98s, 95s, 86s+, 76s, 65s, 54s, 42s, AQo, A4o, KQo, K8o, Q9o, J9o+, 98o, 76o, 65o.

Always fold
T2s-T3s, 92s-94s, 82s-83s, 72s-73s, 62s, 32s, A6o, A2o-A3o, K2o-K7o, Q2o-Q8o, J2o-J8o, T2o-T8o, 92o-97o, 82o-86o, 72o-75o, 62o-64o, 52o+, 42o+, 32o
Always call
22-44, A9s-ATs, K6s, K2s-K4s, Q9s, Q2s-Q7s, J2s-J6s, 96s-97s, 84s-85s, 74s-75s, 63s-64s, 52s-53s, 43s, A7o-AJo, A5o, K9o-KJo, QTo+, T9o, 87o
Always raise 5/7.5bb
JJ+, AQs+, A5s, KJs+, QJs, T9s, AKo
Mixed
55-TT, AJs, A6s-A8s, A2s-A4s, K7s-KTs, K5s, QTs, Q8s, J7s+, T4s-T8s, 98s, 95s, 86s+, 76s, 65s, 54s, 42s, AQo, A4o, KQo, K8o, Q9o, J9o+, 98o, 76o, 65o
Settings: 4-max · 100bb · 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, 100bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.66). 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.

Rake sources for the games it fits: 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.