PokerSolver
PokerSolver/6-max · 40bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BTN vs CO 4-bet 11.5bb

BTN vs CO 4-bet 11.5bb

6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 40bb · CO opens 2.5bb, BTN 3-bets to 5bb, CO 4-bets to 11.5bb · Button to act

6-max · 40bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 18.96bbYour cards?
5bb
0.5bb
1bb
11.5bb

Tap your two cards.

Button's range

176 of 1,326 combos get here
Fold 42%Call 33.9%All-in 39.84bb 24.1%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the button (BTN) when CO opens 2.5bb, BTN 3-bets to 5bb, CO 4-bets to 11.5bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 40bb?

CO opens 2.5bb, BTN 3-bets to 5bb, CO 4-bets to 11.5bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 40bb: the button (BTN) folds 42%, calls 33.9% and goes all-in 39.84bb 24.1%. Always call: 66-77, ATs-AJs, QTs, AJo. Always all-in 39.84bb: QQ-KK, 99, AKs. Mixed: AA, TT-JJ, 88, 55, AQs, A7s-A8s, A5s, A3s, K9s, Q9s, T9s.

Always fold
A6s, ATo, KJo+, QJo
Always call
66-77, ATs-AJs, QTs, AJo
Always all-in 39.84bb
QQ-KK, 99, AKs
Mixed
AA, TT-JJ, 88, 55, AQs, A7s-A8s, A5s, A3s, K9s, Q9s, T9s
Settings: 6-max · 40bb · 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, 40bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.93). 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.