PokerSolver
PokerSolver/4-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs SB iso raise 2.5bb

BB vs SB iso raise 2.5bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 250bb · CO limps, SB isolates to 2.5bb · Big blind to act

4-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 5.14bbYour cards?
1bb
1bb
2.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 82.9%Call 11%Raise 5/7.5bb 6.1%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO limps, SB isolates to 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 250bb?

CO limps, SB isolates to 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 250bb: the big blind (BB) folds 82.9%, calls 11% and raises 5/7.5bb 6.1%. Always call: AQo. Always raise 5/7.5bb: AA, AJs. Mixed: 22-KK, AQs+, A2s-ATs, K8s+, K5s, K3s, Q8s+, Q4s, J9s+, T7s+, 97s, 85s, 76s, 74s, 65s, 53s+, AKo, ATo-AJo, KJo+, QTo+, JTo, 97o, 65o, 54o.

Always fold
K6s-K7s, K4s, K2s, Q5s-Q7s, Q2s-Q3s, J2s-J8s, T2s-T6s, 98s, 92s-96s, 86s+, 82s-84s, 75s, 72s-73s, 62s-64s, 52s, 42s+, 32s, A2o-A9o, K2o-KTo, Q2o-Q9o, J2o-J9o, T2o+, 98o, 92o-96o, 82o+, 72o+, 62o-64o, 52o-53o, 42o+, 32o
Always call
AQo
Always raise 5/7.5bb
AA, AJs
Mixed
22-KK, AQs+, A2s-ATs, K8s+, K5s, K3s, Q8s+, Q4s, J9s+, T7s+, 97s, 85s, 76s, 74s, 65s, 53s+, AKo, ATo-AJo, KJo+, QTo+, JTo, 97o, 65o, 54o
Settings: 4-max · 250bb · 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, 250bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.91). 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.