PokerSolver
PokerSolver/4-max · 250bb · 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) · 250bb · CO limps, BTN isolates to 2.5bb · Big blind to act

Fits exactlyno game we have checked
Close1 games
  • CoinPoker cash with antes NL50rake before the flop in 3-bet pots there, none here
Tournament
4-max · 250bb · 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 18.5%Raise 5/7.5bb 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 250bb?

CO limps, BTN isolates to 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 250bb: the big blind (BB) folds 76.5%, calls 18.5% and raises 5/7.5bb 5%. Always call: QQ-KK, K3s, 87s, AJo+, KQo, QJo. Always raise 5/7.5bb: AQs. Mixed: AA, 22-JJ, AKs, A2s-AJs, K6s+, K4s, Q9s+, Q7s, Q4s-Q5s, J8s+, T7s+, 97s+, 86s, 75s+, 65s, 53s+, 43s, A9o-ATo, KTo-KJo, JTo, 65o.

Always fold
K5s, K2s, Q8s, Q6s, Q2s-Q3s, J2s-J7s, T2s-T6s, 92s-96s, 82s-85s, 72s-74s, 62s-64s, 52s, 42s, 32s, A2o-A8o, K2o-K9o, Q2o-QTo, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o-64o, 52o+, 42o+, 32o
Always call
QQ-KK, K3s, 87s, AJo+, KQo, QJo
Always raise 5/7.5bb
AQs
Mixed
AA, 22-JJ, AKs, A2s-AJs, K6s+, K4s, Q9s+, Q7s, Q4s-Q5s, J8s+, T7s+, 97s+, 86s, 75s+, 65s, 53s+, 43s, A9o-ATo, KTo-KJo, JTo, 65o
Settings: 4-max · 250bb · 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, 250bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.91). 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.

Rake sources for the games it fits: 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.