PokerSolver
PokerSolver/5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs SB iso raise 2.5bb

BB vs SB iso raise 2.5bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · BTN limps, SB isolates to 2.5bb · Big blind to act

5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 5.3bbYour cards?
1bb
1bb
2.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 67.8%Call 20.4%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 BTN limps, SB isolates to 2.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 100bb?

BTN limps, SB isolates to 2.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 100bb: the big blind (BB) folds 67.8%, calls 20.4% and raises 5/7.5bb 11.7%. Always call: 22-99, A8s, A6s, A2s, KTs-KJs, K4s-K5s, J9s, 97s+, 76s, ATo, KQo. Always raise 5/7.5bb: JJ+, AQs+, A3s, JTs, 65s, AQo+. Mixed: TT, A9s-AJs, A7s, A4s-A5s, KQs, K6s-K9s, K2s-K3s, Q6s+, Q2s-Q4s, J6s-J8s, J4s, T7s+, 96s, 85s+, 74s-75s, 63s-64s, 52s+, 43s, AJo, A7o-A9o, A4o-A5o, KTo-KJo, QTo+, J9o+, T9o, 65o, 54o.

Always fold
Q5s, J5s, J2s-J3s, T2s-T6s, 92s-95s, 82s-84s, 72s-73s, 62s, 42s, 32s, A6o, A2o-A3o, K2o-K9o, Q2o-Q9o, J2o-J8o, T2o-T8o, 92o+, 82o+, 72o+, 62o-64o, 52o-53o, 42o+, 32o
Always call
22-99, A8s, A6s, A2s, KTs-KJs, K4s-K5s, J9s, 97s+, 76s, ATo, KQo
Always raise 5/7.5bb
JJ+, AQs+, A3s, JTs, 65s, AQo+
Mixed
TT, A9s-AJs, A7s, A4s-A5s, KQs, K6s-K9s, K2s-K3s, Q6s+, Q2s-Q4s, J6s-J8s, J4s, T7s+, 96s, 85s+, 74s-75s, 63s-64s, 52s+, 43s, AJo, A7o-A9o, A4o-A5o, KTo-KJo, QTo+, J9o+, T9o, 65o, 54o
Settings: 5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 100bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 23.9). 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.