PokerSolver
PokerSolver/5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs BTN iso raise 2.5bb

BB vs BTN iso raise 2.5bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · CO limps, BTN isolates to 2.5bb · Big blind to act

5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 5.8bbYour cards?
1bb
1bb
2.5bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 68.7%Call 21%Raise 5/7.5bb 10.3%
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 in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 80bb?

CO limps, BTN isolates to 2.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 80bb: the big blind (BB) folds 68.7%, calls 21% and raises 5/7.5bb 10.3%. Always call: 77, 22-55, A6s-A7s, A2s, K6s, K2s-K3s, 97s, 85s+, 63s, 53s, ATo, KQo, KTo, QJo. Always raise 5/7.5bb: JJ+, AQs+, ATs, KQs, K9s, QJs, JTs, T9s, AKo. Mixed: 88-TT, 66, AJs, A8s-A9s, A3s-A5s, KTs-KJs, K7s-K8s, K4s-K5s, Q4s-QTs, J7s-J9s, T7s-T8s, 98s, 96s, 74s+, 64s+, 54s, 52s, 43s, AJo-AQo, A8o-A9o, KJo, QTo, JTo, 98o, 65o, 54o.

Always fold
Q2s-Q3s, J2s-J6s, T2s-T6s, 92s-95s, 82s-84s, 72s-73s, 62s, 42s, 32s, A2o-A7o, K2o-K9o, Q2o-Q9o, J2o-J9o, T2o+, 92o-97o, 82o+, 72o+, 62o-64o, 52o-53o, 42o+, 32o
Always call
77, 22-55, A6s-A7s, A2s, K6s, K2s-K3s, 97s, 85s+, 63s, 53s, ATo, KQo, KTo, QJo
Always raise 5/7.5bb
JJ+, AQs+, ATs, KQs, K9s, QJs, JTs, T9s, AKo
Mixed
88-TT, 66, AJs, A8s-A9s, A3s-A5s, KTs-KJs, K7s-K8s, K4s-K5s, Q4s-QTs, J7s-J9s, T7s-T8s, 98s, 96s, 74s+, 64s+, 54s, 52s, 43s, AJo-AQo, A8o-A9o, KJo, QTo, JTo, 98o, 65o, 54o
Settings: 5-max · 80bb · 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, 80bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.95). 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.