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

BB vs SB iso raise 2bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · CO limps, SB isolates to 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 4.64bbYour cards?
1bb
1bb
2bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 75.7%Call 13.9%Raise 4/6bb 10.5%
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 2bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

CO limps, SB isolates to 2bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the big blind (BB) folds 75.7%, calls 13.9% and raises 4/6bb 10.5%. Always call: 55-77, 22-33, A2s, K8s. Always raise 4/6bb: QQ+, AKs, AKo. Mixed: 88-JJ, 44, A3s-AQs, K9s+, K2s-K7s, Q6s+, Q3s-Q4s, J7s+, J4s, T6s+, 95s+, 85s+, 75s+, 63s+, 54s, 42s, A9o-AQo, KTo+, QTo+, T9o, 65o, 54o.

Always fold
Q5s, Q2s, J5s-J6s, J2s-J3s, T2s-T5s, 92s-94s, 82s-84s, 72s-74s, 62s, 52s-53s, 43s, 32s, A2o-A8o, K2o-K9o, Q2o-Q9o, J2o+, T2o-T8o, 92o+, 82o+, 72o+, 62o-64o, 52o-53o, 42o+, 32o
Always call
55-77, 22-33, A2s, K8s
Always raise 4/6bb
QQ+, AKs, AKo
Mixed
88-JJ, 44, A3s-AQs, K9s+, K2s-K7s, Q6s+, Q3s-Q4s, J7s+, J4s, T6s+, 95s+, 85s+, 75s+, 63s+, 54s, 42s, A9o-AQo, KTo+, QTo+, T9o, 65o, 54o
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.