PokerSolver/5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BTN vs CO 4-bet 20.7bb

BTN vs CO 4-bet 20.7bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · CO opens 3bb, BTN 3-bets to 9bb, CO 4-bets to 20.7bb · Button to act

5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game

PlayersBlinds & rakeEff. stack

Stacks (bb), if they differHJCOBTNSBBB

Pot 32bbYour cards?

9bb

0.5bb

1bb

20.7bb

Tap your two cards.

Button's range

370 of 1,326 combos get here

Fold 56.4%Call 24%All-in 79.84bb 19.6%

Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the button (BTN) when CO opens 3bb, BTN 3-bets to 9bb, CO 4-bets to 20.7bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 80bb?

CO opens 3bb, BTN 3-bets to 9bb, CO 4-bets to 20.7bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 80bb: the button (BTN) folds 56.4%, calls 24% and goes all-in 79.84bb 19.6%. Always call: AA, 88, AQs, KTs, QTs+, T9s, 87s, 76s, 54s. Always all-in 79.84bb: TT-KK, AKs, AKo. Mixed: 99, 33-77, A3s-A6s, KQs, J9s, AQo.

Always fold: A2s, K2s-K9s, Q7s-Q9s, A8o-AJo, A5o, KTo+, QTo+
Always call: AA, 88, AQs, KTs, QTs+, T9s, 87s, 76s, 54s
Always all-in 79.84bb: TT-KK, AKs, AKo
Mixed: 99, 33-77, A3s-A6s, KQs, J9s, AQo

Settings: 5-max · 80bb · 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, 80bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.95). 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.