PokerSolver/6-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BTN vs CO 4-bet 20.7bb

BTN vs CO 4-bet 20.7bb

6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO opens 3bb, BTN 3-bets to 9bb, CO 4-bets to 20.7bb · Button to act

Fits exactlyno game we have checked

Close1 games

CoinPoker cash with antes NL50rake before the flop in 3-bet pots there, none here

Tournament

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

PlayersBlinds & rakeEff. stack

Stacks (bb), if they differUTGHJCOBTNSBBB

Pot 32.16bbYour cards?

9bb

0.5bb

1bb

20.7bb

Tap your two cards.

Button's range

358 of 1,326 combos get here

Fold 46.5%Call 37.6%All-in 99.84bb 15.8%

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

What is the GTO play for the button (BTN) when CO opens 3bb, BTN 3-bets to 9bb, CO 4-bets to 20.7bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 100bb?

CO opens 3bb, BTN 3-bets to 9bb, CO 4-bets to 20.7bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 100bb: the button (BTN) folds 46.5%, calls 37.6% and goes all-in 99.84bb 15.8%. Always call: AA, 55-88, AQs, A7s-A8s, K9s-KJs, Q9s+, J9s+, T8s+, 87s, 76s, 65s, 54s. Always all-in 99.84bb: JJ-KK, AKs, A4s-A5s, KQs, AKo. Mixed: TT, 44, A3s, K8s, AQo, KQo.

Always fold: A6s, A2s, K2s-K7s, A8o-AJo, A4o-A5o, KTo-KJo, QTo+
Always call: AA, 55-88, AQs, A7s-A8s, K9s-KJs, Q9s+, J9s+, T8s+, 87s, 76s, 65s, 54s
Always all-in 99.84bb: JJ-KK, AKs, A4s-A5s, KQs, AKo
Mixed: TT, 44, A3s, K8s, AQo, KQo

Settings: 6-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 24.89). 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.

Tree: Two HRC solves of this game in one, callers first: the callers solve (its raises grow by 1bb, or 1x, for each player who called before) has every one of the 1,323 spots here, so the base solve gives none of them.

This spot: from the callers solve (sizes: opens 2.0bb + 1.0bb, 2.5bb + 1.0bb, 3.0bb + 1.0bb; 3-bets 2.0x + 1.0x, 3.0x + 1.0x; 4-bets 2.3x, all-in; 5-bets all-in; HRC CI 24.58).

Rake sources for the games it fits: 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.