PokerSolver
PokerSolver/4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs BTN iso raise 2.5bb

BB vs BTN 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 · CO limps, BTN 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 5.64bbYour cards?
1bb
1bb
2.5bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 74.2%Call 16.4%Raise 5/7.5bb 9.4%
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 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

CO limps, BTN isolates to 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the big blind (BB) folds 74.2%, calls 16.4% and raises 5/7.5bb 9.4%. Always call: 66, 22-44, A9s, A5s, A2s-A3s, K4s, 97s, AJo, KJo+. Always raise 5/7.5bb: QQ+, AKs, KTs+, JTs, AKo. Mixed: 77-JJ, 55, ATs-AQs, A6s-A8s, A4s, K5s-K9s, K2s-K3s, Q6s+, J8s-J9s, T8s+, 98s, 96s, 86s+, 74s+, 63s+, 53s+, 43s, AQo, A9o-ATo, KTo, QTo+, JTo, 54o.

Always fold
Q2s-Q5s, J2s-J7s, T2s-T7s, 92s-95s, 82s-85s, 72s-73s, 62s, 52s, 42s, 32s, A2o-A8o, K2o-K9o, Q2o-Q9o, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o+, 52o-53o, 42o+, 32o
Always call
66, 22-44, A9s, A5s, A2s-A3s, K4s, 97s, AJo, KJo+
Always raise 5/7.5bb
QQ+, AKs, KTs+, JTs, AKo
Mixed
77-JJ, 55, ATs-AQs, A6s-A8s, A4s, K5s-K9s, K2s-K3s, Q6s+, J8s-J9s, T8s+, 98s, 96s, 86s+, 74s+, 63s+, 53s+, 43s, AQo, A9o-ATo, KTo, QTo+, JTo, 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.