PokerSolver
PokerSolver/6-max · 40bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs CO 3-bet 4bb

BB vs CO 3-bet 4bb

6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 40bb · CO limps, BB isolates to 2bb, CO 3-bets to 4bb · Big blind to act

6-max · 40bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 7.46bbYour cards?
2bb
4bb
0.5bb

Tap your two cards.

Big blind's range

334 of 1,326 combos get here
Fold 41.1%Call 28.1%Raise 9.2bb 21.6%All-in 39.84bb 9.3%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO limps, BB isolates to 2bb, CO 3-bets to 4bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 40bb?

CO limps, BB isolates to 2bb, CO 3-bets to 4bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 40bb: the big blind (BB) folds 41.1%, calls 28.1%, raises 9.2bb 21.6% and goes all-in 39.84bb 9.3%. Always call: 77, KQs, QJs. Always raise 9.2bb: KK. Mixed: TT-QQ, 88, 55-66, AQs+, A8s-ATs, A5s, A2s-A3s, KJs, K7s, QTs, Q8s, J8s-J9s, T8s+, 97s, 86s+, 75s+, ATo+, A5o, KJo+.

Always fold
J4s, 82s, 54s, JTo, T9o
Always call
77, KQs, QJs
Always raise 9.2bb
KK
Always all-in 39.84bb
No hand plays this every time
Mixed
TT-QQ, 88, 55-66, AQs+, A8s-ATs, A5s, A2s-A3s, KJs, K7s, QTs, Q8s, J8s-J9s, T8s+, 97s, 86s+, 75s+, ATo+, A5o, KJo+
Settings: 6-max · 40bb · 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, 40bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.93). 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.