PokerSolver/5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BTN vs CO 4-bet 11.5bb

BTN 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) · 100bb · CO opens 2.5bb, BTN 3-bets to 5bb, CO 4-bets to 11.5bb · Button to act

5-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game

PlayersBlinds & rakeEff. stack

Stacks (bb), if they differHJCOBTNSBBB

Pot 18.8bbYour cards?

5bb

0.5bb

1bb

11.5bb

Tap your two cards.

Button's range

322 of 1,326 combos get here

Fold 31.9%Call 63.3%All-in 99.84bb 4.8%

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 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 100bb?

CO opens 2.5bb, BTN 3-bets to 5bb, CO 4-bets to 11.5bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 100bb: the button (BTN) folds 31.9%, calls 63.3% and goes all-in 99.84bb 4.8%. Always call: 33-KK, AJs-AQs, A9s, A3s-A5s, K8s+, QTs+, J9s+, T8s+, 98s, 76s, 54s. Mixed: AA, AKs, ATs, A6s-A8s, K5s-K7s, AJo+.

Always fold: ATo, KTo+, QJo
Always call: 33-KK, AJs-AQs, A9s, A3s-A5s, K8s+, QTs+, J9s+, T8s+, 98s, 76s, 54s
Always all-in 99.84bb: No hand plays this every time
Mixed: AA, AKs, ATs, A6s-A8s, K5s-K7s, AJo+

Settings: 5-max · 100bb · 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, 100bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 23.9). 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.