PokerSolver
PokerSolver/5-max · 100bb · 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) · 100bb · CO limps, BTN 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 5.8bbYour cards?
1bb
1bb
2.5bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 70.9%Call 19.7%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 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 100bb?

CO limps, BTN isolates to 2.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 100bb: the big blind (BB) folds 70.9%, calls 19.7% and raises 5/7.5bb 9.4%. Always call: 22-44, A6s, A3s, K4s, T8s, 86s, 75s+, 53s, ATo-AJo, KQo. Always raise 5/7.5bb: QQ+, AKs, QJs, JTs, T9s, AKo. Mixed: 55-JJ, A7s-AQs, A4s-A5s, A2s, K5s+, K2s-K3s, Q3s-QTs, J8s-J9s, T7s, 96s+, 87s, 85s, 63s+, 54s, 43s, AQo, A8o-A9o, KTo-KJo, QTo+, JTo, 54o.

Always fold
Q2s, J2s-J7s, T2s-T6s, 92s-95s, 82s-84s, 72s-74s, 62s, 52s, 42s, 32s, A2o-A7o, K2o-K9o, Q2o-Q9o, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o+, 52o-53o, 42o+, 32o
Always call
22-44, A6s, A3s, K4s, T8s, 86s, 75s+, 53s, ATo-AJo, KQo
Always raise 5/7.5bb
QQ+, AKs, QJs, JTs, T9s, AKo
Mixed
55-JJ, A7s-AQs, A4s-A5s, A2s, K5s+, K2s-K3s, Q3s-QTs, J8s-J9s, T7s, 96s+, 87s, 85s, 63s+, 54s, 43s, AQo, A8o-A9o, KTo-KJo, QTo+, JTo, 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.