PokerSolver
PokerSolver/4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BTN vs CO 4-bet 20.7bb

BTN vs CO 4-bet 20.7bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (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

4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 31.84bbYour cards?
9bb
0.5bb
1bb
20.7bb

Tap your two cards.

Button's range

372 of 1,326 combos get here
Fold 57.4%Call 26%All-in 79.84bb 16.6%
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 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

CO opens 3bb, BTN 3-bets to 9bb, CO 4-bets to 20.7bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the button (BTN) folds 57.4%, calls 26% and goes all-in 79.84bb 16.6%. Always call: AA, 55-88, ATs-AQs, KJs, QTs+, 98s, 87s, 76s, 65s. Always all-in 79.84bb: TT-KK, AKs, AKo. Mixed: 99, 44, A8s, A3s-A5s, KQs, J9s, T9s, AQo.

Always fold
A6s-A7s, A2s, K2s-K9s, Q7s-Q9s, Q3s, T8s, A8o-AJo, KTo+, QTo+
Always call
AA, 55-88, ATs-AQs, KJs, QTs+, 98s, 87s, 76s, 65s
Always all-in 79.84bb
TT-KK, AKs, AKo
Mixed
99, 44, A8s, A3s-A5s, KQs, J9s, T9s, AQo
Settings: 4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 80bb stacks, 5% rake capped at 4.8bb; 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.