PokerSolver/4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs SB iso raise 2.5bb

BB vs SB 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, SB 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 · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game

PlayersBlinds & rakeEff. stack

Stacks (bb), if they differCOBTNSBBB

Pot 5.14bbYour cards?

1bb

2.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here

Fold 83.6%Call 8.6%Raise 5/7.5bb 7.9%

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, SB isolates to 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

CO limps, SB isolates to 2.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the big blind (BB) folds 83.6%, calls 8.6% and raises 5/7.5bb 7.9%. Always call: 22-77, KQs, Q9s. Always raise 5/7.5bb: QQ+, AKs, AKo. Mixed: 88-JJ, A2s-AQs, K6s-KJs, K2s-K4s, QTs+, Q3s-Q4s, J8s+, T7s+, 98s, 96s, 86s+, 63s+, 53s+, ATo-AQo, A8o, KQo.

Always fold: K5s, Q5s-Q8s, Q2s, J2s-J7s, T2s-T6s, 97s, 92s-95s, 82s-85s, 72s+, 62s, 52s, 42s+, 32s, A9o, A2o-A7o, K2o-KJo, Q2o+, J2o+, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call: 22-77, KQs, Q9s
Always raise 5/7.5bb: QQ+, AKs, AKo
Mixed: 88-JJ, A2s-AQs, K6s-KJs, K2s-K4s, QTs+, Q3s-Q4s, J8s+, T7s+, 98s, 96s, 86s+, 63s+, 53s+, ATo-AQo, A8o, KQo

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.

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.