PokerSolver
PokerSolver/4-max · 80bb · 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) · 80bb · BTN limps, SB isolates to 2.5bb · 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 5.14bbYour cards?
1bb
1bb
2.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 71.5%Call 17.2%Raise 5/7.5bb 11.3%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when BTN limps, SB isolates to 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

BTN limps, SB isolates to 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the big blind (BB) folds 71.5%, calls 17.2% and raises 5/7.5bb 11.3%. Always call: 22-88, A9s, A6s-A7s, A4s, A2s, K4s-K5s, AJo, KQo. Always raise 5/7.5bb: JJ+, AQs+, J8s, AQo+. Mixed: 99-TT, ATs-AJs, A8s, A5s, A3s, K6s+, K2s-K3s, Q2s+, J9s+, J4s, J2s, T6s+, 96s+, 85s+, 73s+, 64s+, 54s, 43s, 32s, A9o-ATo, A4o-A5o, KTo-KJo, QTo+, JTo.

Always fold
J5s-J7s, J3s, T2s-T5s, 92s-95s, 82s-84s, 72s, 62s-63s, 52s-53s, 42s, A6o-A8o, A2o-A3o, K2o-K9o, Q2o-Q9o, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
22-88, A9s, A6s-A7s, A4s, A2s, K4s-K5s, AJo, KQo
Always raise 5/7.5bb
JJ+, AQs+, J8s, AQo+
Mixed
99-TT, ATs-AJs, A8s, A5s, A3s, K6s+, K2s-K3s, Q2s+, J9s+, J4s, J2s, T6s+, 96s+, 85s+, 73s+, 64s+, 54s, 43s, 32s, A9o-ATo, A4o-A5o, KTo-KJo, QTo+, JTo
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.