PokerSolver
PokerSolver/4-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs CO all-in

BB vs CO all-in

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 250bb · CO limps, BB isolates to 2.5bb, CO 3-bets to 7.5bb, BB 4-bets to 17.25bb, CO goes all-in · Big blind to act

4-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 268.23bbYour cards?
17.25bb
249.84bb
0.5bb

Tap your two cards.

Big blind's range

200 of 1,326 combos get here
Fold 77%Call 23.1%
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, BB isolates to 2.5bb, CO 3-bets to 7.5bb, BB 4-bets to 17.25bb, CO goes all-in in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 250bb?

CO limps, BB isolates to 2.5bb, CO 3-bets to 7.5bb, BB 4-bets to 17.25bb, CO goes all-in in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 250bb: the big blind (BB) folds 77% and calls 23.1%. Always call: AA. Mixed: QQ-KK, 88-TT, 66, A8s+, A3s, KJs, K5s, QTs, 76s, AKo.

Always fold
77, 55, A4s-A6s, KQs, K3s, Q8s, J9s+, T9s, 87s
Always call
AA
Mixed
QQ-KK, 88-TT, 66, A8s+, A3s, KJs, K5s, QTs, 76s, AKo
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.

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.