PokerSolver
PokerSolver/5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs CO 4-bet 11.5bb

BB vs CO 4-bet 11.5bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 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

5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 17.8bbYour cards?
5bb
11.5bb
0.5bb

Tap your two cards.

Big blind's range

242 of 1,326 combos get here
Fold 34.4%Call 52.6%Raise 25.3bb 11.5%All-in 249.84bb 1.4%
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 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 250bb?

CO opens 2.5bb, BB 3-bets to 5bb, CO 4-bets to 11.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 250bb: the big blind (BB) folds 34.4%, calls 52.6%, raises 25.3bb 11.5% and goes all-in 249.84bb 1.4%. Always call: JJ, 77-99, 44-55, AJs, KJs+, QJs, J9s, 65s. Always raise 25.3bb: AA. Mixed: QQ-KK, TT, 66, AQs+, A9s-ATs, A3s-A5s, KTs, QTs, JTs, T8s+, 86s+, 76s, 54s, AKo.

Always fold
K9s, K7s, AQo, KQo, JTo
Always call
JJ, 77-99, 44-55, AJs, KJs+, QJs, J9s, 65s
Always raise 25.3bb
AA
Always all-in 249.84bb
No hand plays this every time
Mixed
QQ-KK, TT, 66, AQs+, A9s-ATs, A3s-A5s, KTs, QTs, JTs, T8s+, 86s+, 76s, 54s, AKo
Settings: 5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 250bb stacks, 5% rake capped at 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.