PokerSolver
PokerSolver/6-max · 100bb · SB 0.4bb · 5% rake, cap 2.6bb/BTN vs CO 4-bet 20.6bb

BTN vs CO 4-bet 20.6bb

6-max · SB 0.4bb · 5% rake, cap 2.6bb (blinds 0.4/1bb) · 100bb · CO opens 3bb, BTN 3-bets to 9bb, CO 4-bets to 20.6bb · Button to act

6-max · 100bb · SB 0.4bb · 5% rake, cap 2.6bbChange game
Stacks (bb), if they differ
Pot 31bbYour cards?
9bb
0.4bb
1bb
20.6bb

Tap your two cards.

Button's range

238 of 1,326 combos get here
Fold 36.3%Call 54.9%All-in 100bb 8.8%
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 20.6bb in 6-max · SB 0.4bb · 5% rake, cap 2.6bb at 100bb?

CO opens 3bb, BTN 3-bets to 9bb, CO 4-bets to 20.6bb in 6-max · SB 0.4bb · 5% rake, cap 2.6bb, 100bb: the button (BTN) folds 36.3%, calls 54.9% and goes all-in 100bb 8.8%. Always call: AA, 44-JJ, AQs+, A9s, A4s-A5s, KTs+, QTs+, J9s+, T9s, 65s, 54s, AQo. Always all-in 100bb: KK, AKo. Mixed: QQ, A8s.

Always fold
A6s-A7s, A2s-A3s, K8s-K9s, ATo-AJo, KJo+, QJo
Always call
AA, 44-JJ, AQs+, A9s, A4s-A5s, KTs+, QTs+, J9s+, T9s, 65s, 54s, AQo
Always all-in 100bb
KK, AKo
Mixed
QQ, A8s
Settings: 6-max · 100bb · SB 0.4bb · 5% rake, cap 2.6bb (small blind 0.4bb, big blind 1bb, 100bb stacks, 5% rake capped at 2.6bb; before the flop, rake only after a 3-bet). Solver: HoldemResources Calculator (HRC). 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: GGPoker Rush & Cash NL5, NL25 (rake cap 3bb there, 2.6bb here).

Close: GGPoker regular cash NL500 (rake cap 1.6bb there, 2.6bb here).

Close: CoinPoker cash NL500 (rake cap 1.6bb there, 2.6bb here; only its tables without antes).

Close: WPT Global cash NL50 (rake cap 4bb there, 2.6bb here; 4% rake there, 5% here; no rake when no flop is dealt there; only its tables without antes).

Close: Natural8 Rush & Cash NL5, NL25 (rake cap 3bb there, 2.6bb here).

Close: Natural8 regular cash NL500 (rake cap 1.6bb there, 2.6bb here).

CoinPoker tables with antes: their own chart.

Rake sources: ggpoker.com/poker-games/texas-holdem (fetched 2026-10-31); Rush rake and preflop rake confirmed on our own GG exports (972 of 1,034 pots, 210 of 211); regular tables' preflop rule from natural8.com/en/poker/texas-holdem (same network, fetched 2026-10-31); coinpoker.com/games/texas-holdem/ (caps and the preflop rule) and coinpoker.com/guides/poker-rake/ (5%), fetched 2026-10-31; wptglobal.com/poker/poker-table-rake (fetched 2026-10-31); natural8.com/en/poker/rush-and-cash (fetched 2026-10-31; caps $0.06 to $6, 3bb at every stake); the same GGNetwork pools as GGPoker, whose preflop rake we confirmed on GG exports; natural8.com/en/poker/texas-holdem (fetched 2026-10-31; caps by players dealt in, 3-bet pots raked before the flop).

Rake: Wrong rake for GG: this solve caps the rake at 2.6bb, but GG caps an NL5 table with 5 or 6 players dealt in at $0.50 (10bb), and it opens 3bb only. Hands from 6-handed tables are graded on the 3bb cap charts instead. A solve with GG's cap is queued.