PokerSolver
PokerSolver/4-max · 100bb · 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) · 100bb · CO limps, BTN isolates to 2.5bb · 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 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 76.5%Call 15%Raise 5/7.5bb 8.5%
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 100bb?

CO limps, BTN isolates to 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the big blind (BB) folds 76.5%, calls 15% and raises 5/7.5bb 8.5%. Always call: TT, 22-55, A8s, A4s, A2s, 75s, KJo+. Always raise 5/7.5bb: QQ+, AKs, QTs, AKo. Mixed: JJ, 66-99, A9s-AQs, A5s-A7s, A3s, K4s+, K2s, QJs, Q4s-Q9s, J9s+, T7s+, 97s+, 86s+, 76s, 74s, 64s+, 54s, 43s, A9o-AQo, KTo, QTo+, JTo, 65o.

Always fold
K3s, Q2s-Q3s, J2s-J8s, T2s-T6s, 92s-96s, 82s-85s, 72s-73s, 62s-63s, 52s-53s, 42s, 32s, A2o-A8o, K2o-K9o, Q2o-Q9o, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o-64o, 52o+, 42o+, 32o
Always call
TT, 22-55, A8s, A4s, A2s, 75s, KJo+
Always raise 5/7.5bb
QQ+, AKs, QTs, AKo
Mixed
JJ, 66-99, A9s-AQs, A5s-A7s, A3s, K4s+, K2s, QJs, Q4s-Q9s, J9s+, T7s+, 97s+, 86s+, 76s, 74s, 64s+, 54s, 43s, A9o-AQo, KTo, QTo+, JTo, 65o
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.