PokerSolver
PokerSolver/5-max · 250bb · 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) · 250bb · CO opens 3bb, BTN 3-bets to 9bb, CO 4-bets to 20.7bb · Button to act

5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 32bbYour cards?
9bb
0.5bb
1bb
20.7bb

Tap your two cards.

Button's range

350 of 1,326 combos get here
Fold 26.8%Call 59.9%Raise 45.54bb 12.8%All-in 249.84bb 0.5%
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 250bb?

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, 250bb: the button (BTN) folds 26.8%, calls 59.9%, raises 45.54bb 12.8% and goes all-in 249.84bb 0.5%. Always call: 22-JJ, A9s-AJs, A6s, A2s-A4s, KJs+, K9s, K6s-K7s, QTs+, J9s+, T8s, 98s, 86s+, 76s, 65s, 54s. Always raise 45.54bb: AA. Mixed: QQ-KK, AQs+, A7s-A8s, A5s, KTs, K8s, K4s-K5s, Q9s, J8s, T9s, AJo+, KJo.

Always fold
K3s, ATo, KQo, KTo, QJo
Always call
22-JJ, A9s-AJs, A6s, A2s-A4s, KJs+, K9s, K6s-K7s, QTs+, J9s+, T8s, 98s, 86s+, 76s, 65s, 54s
Always raise 45.54bb
AA
Always all-in 249.84bb
No hand plays this every time
Mixed
QQ-KK, AQs+, A7s-A8s, A5s, KTs, K8s, K4s-K5s, Q9s, J8s, T9s, AJo+, KJo
Settings: 5-max · 250bb · 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, 250bb stacks, 5% rake capped at 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.