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

BB vs BTN call

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO opens 2.5bb, BTN calls · Big blind to act

4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 7.14bbYour cards?
1bb
2.5bb
2.5bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 76.1%Call 11.8%Raise 5/7.5bb 12.2%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO opens 2.5bb, BTN calls in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

CO opens 2.5bb, BTN calls in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the big blind (BB) folds 76.1%, calls 11.8% and raises 5/7.5bb 12.2%. Always call: 44, 22, A6s. Always raise 5/7.5bb: TT+, AJs+, KTs+, AQo+. Mixed: 55-99, 33, A7s-ATs, A2s-A5s, K2s-K9s, Q5s+, Q3s, J7s+, T6s+, 96s+, 85s+, 75s+, 64s+, 53s+, 43s, ATo-AJo, KTo+, QJo, JTo.

Always fold
Q4s, Q2s, J2s-J6s, T2s-T5s, 92s-95s, 82s-84s, 72s-74s, 62s-63s, 52s, 42s, 32s, A2o-A9o, K2o-K9o, Q2o-QTo, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
44, 22, A6s
Always raise 5/7.5bb
TT+, AJs+, KTs+, AQo+
Mixed
55-99, 33, A7s-ATs, A2s-A5s, K2s-K9s, Q5s+, Q3s, J7s+, T6s+, 96s+, 85s+, 75s+, 64s+, 53s+, 43s, ATo-AJo, KTo+, QJo, JTo
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.

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.