PokerSolver
PokerSolver/4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BTN vs CO 4-bet 11.5bb

BTN vs CO 4-bet 11.5bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · CO opens 2.5bb, BTN 3-bets to 5bb, CO 4-bets to 11.5bb · Button to act

4-max · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 18.64bbYour cards?
5bb
0.5bb
1bb
11.5bb

Tap your two cards.

Button's range

310 of 1,326 combos get here
Fold 27.5%Call 70.1%All-in 99.84bb 2.4%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the button (BTN) when CO opens 2.5bb, BTN 3-bets to 5bb, CO 4-bets to 11.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 100bb?

CO opens 2.5bb, BTN 3-bets to 5bb, CO 4-bets to 11.5bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 100bb: the button (BTN) folds 27.5%, calls 70.1% and goes all-in 99.84bb 2.4%. Always call: KK+, 22-TT, ATs+, A4s-A5s, A2s, KTs+, QTs+, J9s+, T8s+, 98s, 87s, 76s, 65s, AQo. Mixed: JJ-QQ, A6s-A9s, K7s-K9s, Q9s, AJo, KQo.

Always fold
KJo, QJo, JTo
Always call
KK+, 22-TT, ATs+, A4s-A5s, A2s, KTs+, QTs+, J9s+, T8s+, 98s, 87s, 76s, 65s, AQo
Always all-in 99.84bb
No hand plays this every time
Mixed
JJ-QQ, A6s-A9s, K7s-K9s, Q9s, AJo, KQo
Settings: 4-max · 100bb · 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, 100bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.66). 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.