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 limps, BTN isolates to 2.5bb, SB calls · Big blind to act

4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 7.64bbYour cards?
1bb
1bb
2.5bb
2.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 87%Call 4.9%Raise 5/7.5bb 8%
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, BTN isolates to 2.5bb, SB calls in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

CO limps, BTN isolates to 2.5bb, SB calls in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the big blind (BB) folds 87%, calls 4.9% and raises 5/7.5bb 8%. Always call: 77. Always raise 5/7.5bb: JJ+, AJs+, AKo. Mixed: 88-TT, 55-66, 22-33, ATs, A5s-A8s, A2s-A3s, KTs+, K5s-K8s, Q8s+, Q6s, J9s, J6s-J7s, J3s, T9s, T7s, T3s, 98s, 87s, 83s, 76s, 73s, 65s, 63s, 42s, AQo, KQo.

Always fold
44, A9s, A4s, K9s, K2s-K4s, Q7s, Q2s-Q5s, JTs, J8s, J4s-J5s, J2s, T8s, T4s-T6s, T2s, 92s-97s, 84s-86s, 82s, 74s-75s, 72s, 64s, 62s, 52s+, 43s, 32s, A2o-AJo, K2o-KJo, Q2o+, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
77
Always raise 5/7.5bb
JJ+, AJs+, AKo
Mixed
88-TT, 55-66, 22-33, ATs, A5s-A8s, A2s-A3s, KTs+, K5s-K8s, Q8s+, Q6s, J9s, J6s-J7s, J3s, T9s, T7s, T3s, 98s, 87s, 83s, 76s, 73s, 65s, 63s, 42s, AQo, KQo
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.

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.