PokerSolver
PokerSolver/5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BTN vs CO 3-bet 4bb

BTN vs CO 3-bet 4bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · CO limps, BTN isolates to 2bb, CO 3-bets to 4bb · Button to act

5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 8.3bbYour cards?
2bb
0.5bb
1bb
4bb

Tap your two cards.

Button's range

402 of 1,326 combos get here
Fold 8.9%Call 67.2%Raise 9.2bb 15.5%All-in 79.84bb 8.4%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the button (BTN) when CO limps, BTN isolates to 2bb, CO 3-bets to 4bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 80bb?

CO limps, BTN isolates to 2bb, CO 3-bets to 4bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 80bb: the button (BTN) folds 8.9%, calls 67.2%, raises 9.2bb 15.5% and goes all-in 79.84bb 8.4%. Always call: 77-88, 22-55, A2s, KTs, K5s-K6s, QJs, T8s+, KQo, QTo. Always raise 9.2bb: AA. Mixed: 99-KK, 66, A3s+, KJs+, K7s-K9s, K4s, Q7s-QTs, J8s+, 97s+, 86s+, 76s, 64s+, 54s, A8o+, KTo-KJo, QJo, JTo.

Always fold
No hand plays this every time
Always call
77-88, 22-55, A2s, KTs, K5s-K6s, QJs, T8s+, KQo, QTo
Always raise 9.2bb
AA
Always all-in 79.84bb
No hand plays this every time
Mixed
99-KK, 66, A3s+, KJs+, K7s-K9s, K4s, Q7s-QTs, J8s+, 97s+, 86s+, 76s, 64s+, 54s, A8o+, KTo-KJo, QJo, JTo
Settings: 5-max · 80bb · 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, 80bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.95). 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.