PokerSolver
PokerSolver/5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs BTN iso raise 3bb

BB vs BTN iso raise 3bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO limps, BTN isolates to 3bb · Big blind to act

5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 6.3bbYour cards?
1bb
1bb
3bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 77.6%Call 14.1%Raise 6/9bb 8.4%
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 3bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 100bb?

CO limps, BTN isolates to 3bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 100bb: the big blind (BB) folds 77.6%, calls 14.1% and raises 6/9bb 8.4%. Always call: 77-88, 22-55, K8s, 97s, 53s, ATo-AJo, KQo. Always raise 6/9bb: QQ+, AQs+, K9s, AKo. Mixed: 99-JJ, 66, A2s-AJs, KTs+, K6s-K7s, K4s, Q7s+, J9s+, T8s+, 98s, 96s, 86s+, 75s+, 64s+, 54s, AQo, KJo, QJo.

Always fold
K5s, K2s-K3s, Q2s-Q6s, J2s-J8s, T2s-T7s, 92s-95s, 82s-85s, 72s-74s, 62s-63s, 52s, 42s+, 32s, A2o-A9o, K2o-KTo, Q2o-QTo, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
77-88, 22-55, K8s, 97s, 53s, ATo-AJo, KQo
Always raise 6/9bb
QQ+, AQs+, K9s, AKo
Mixed
99-JJ, 66, A2s-AJs, KTs+, K6s-K7s, K4s, Q7s+, J9s+, T8s+, 98s, 96s, 86s+, 75s+, 64s+, 54s, AQo, KJo, QJo
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.