PokerSolver/4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs SB call

BB vs SB call

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · CO limps, BTN isolates to 2.5bb, SB calls · Big blind to act

4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game

PlayersBlinds & rakeEff. stack

Stacks (bb), if they differCOBTNSBBB

Pot 7.64bbYour cards?

1bb

2.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here

Fold 85.4%Call 5.5%Raise 5/7.5bb 9.2%

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, SB calls in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

CO limps, BTN isolates to 2.5bb, SB calls in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the big blind (BB) folds 85.4%, calls 5.5% and raises 5/7.5bb 9.2%. Always call: KQs, J9s. Always raise 5/7.5bb: TT+, AQo+. Mixed: 66-99, 33-44, A8s+, A5s-A6s, A2s-A3s, K6s-KJs, K3s-K4s, Q7s+, JTs, T7s+, T3s, 96s+, 87s, 85s, 75s+, 63s-64s, AJo, A8o, KJo+, JTo, T9o, 96o.

Always fold: 55, 22, A7s, A4s, K5s, K2s, Q2s-Q6s, J2s-J8s, T4s-T6s, T2s, 92s-95s, 86s, 82s-84s, 72s-74s, 65s, 62s, 52s+, 42s+, 32s, A9o-ATo, A2o-A7o, K2o-KTo, Q2o+, J2o-J9o, T2o-T8o, 97o+, 92o-95o, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call: KQs, J9s
Always raise 5/7.5bb: TT+, AQo+
Mixed: 66-99, 33-44, A8s+, A5s-A6s, A2s-A3s, K6s-KJs, K3s-K4s, Q7s+, JTs, T7s+, T3s, 96s+, 87s, 85s, 75s+, 63s-64s, AJo, A8o, KJo+, JTo, T9o, 96o

Settings: 4-max · 80bb · 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, 80bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.98). 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.