PokerSolver
PokerSolver/4-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs CO 4-bet 11.5bb

BB vs CO 4-bet 11.5bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 250bb · CO opens 2.5bb, BB 3-bets to 5bb, CO 4-bets to 11.5bb · 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 17.64bbYour cards?
5bb
11.5bb
0.5bb

Tap your two cards.

Big blind's range

236 of 1,326 combos get here
Fold 36.3%Call 52.1%Raise 25.3bb 10.7%All-in 249.84bb 0.9%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO opens 2.5bb, BB 3-bets to 5bb, CO 4-bets to 11.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 250bb?

CO opens 2.5bb, BB 3-bets to 5bb, CO 4-bets to 11.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 250bb: the big blind (BB) folds 36.3%, calls 52.1%, raises 25.3bb 10.7% and goes all-in 249.84bb 0.9%. Always call: TT, 55-66, 33, A5s, KQs, QTs+, JTs. Mixed: JJ+, 77-99, ATs+, A7s-A8s, KTs-KJs, T9s, 98s, 76s, 64s, 54s, AKo.

Always fold
K8s, JTo
Always call
TT, 55-66, 33, A5s, KQs, QTs+, JTs
Always raise 25.3bb
No hand plays this every time
Always all-in 249.84bb
No hand plays this every time
Mixed
JJ+, 77-99, ATs+, A7s-A8s, KTs-KJs, T9s, 98s, 76s, 64s, 54s, 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.