PokerSolver
PokerSolver/4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs SB call

BB vs SB call

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, SB calls · 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 6.64bbYour cards?
1bb
2.5bb
2.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 63.5%Call 24.8%Raise 5/7.5bb 11.7%
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, SB calls in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

CO opens 2.5bb, SB calls in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the big blind (BB) folds 63.5%, calls 24.8% and raises 5/7.5bb 11.7%. Always call: 22-55, A8s, A6s, A3s-A4s, K7s-K8s, K2s-K3s, Q7s-Q8s, Q5s, J7s, 96s-97s, 75s+, 63s, 54s, 43s, ATo-AJo, KTo-KJo, QJo, JTo. Always raise 5/7.5bb: TT+, 88, AJs+, KTs+, QTs, T9s, AQo+. Mixed: 99, 66-77, A9s-ATs, A7s, A5s, A2s, K9s, K4s-K6s, QJs, Q9s, Q6s, Q2s-Q4s, J8s+, J5s-J6s, T6s-T8s, T4s, 98s, 95s, 85s+, 74s, 64s+, 62s, 52s-53s, 42s, A9o, KQo, QTo, T8o+, 87o, 75o+, 65o, 54o.

Always fold
J2s-J4s, T5s, T2s-T3s, 92s-94s, 82s-84s, 72s-73s, 32s, A2o-A8o, K2o-K9o, Q2o-Q9o, J2o-J9o, T2o-T7o, 92o+, 82o-86o, 72o-74o, 62o-64o, 52o-53o, 42o+, 32o
Always call
22-55, A8s, A6s, A3s-A4s, K7s-K8s, K2s-K3s, Q7s-Q8s, Q5s, J7s, 96s-97s, 75s+, 63s, 54s, 43s, ATo-AJo, KTo-KJo, QJo, JTo
Always raise 5/7.5bb
TT+, 88, AJs+, KTs+, QTs, T9s, AQo+
Mixed
99, 66-77, A9s-ATs, A7s, A5s, A2s, K9s, K4s-K6s, QJs, Q9s, Q6s, Q2s-Q4s, J8s+, J5s-J6s, T6s-T8s, T4s, 98s, 95s, 85s+, 74s, 64s+, 62s, 52s-53s, 42s, A9o, KQo, QTo, T8o+, 87o, 75o+, 65o, 54o
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.