PokerSolver
PokerSolver/6-max · 20bb · 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) · 20bb · CO limps, BB isolates to 2bb, CO 3-bets to 4bb · Big blind to act

6-max · 20bb · 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

384 of 1,326 combos get here
Fold 43.6%Call 19.3%All-in 19.84bb 37.1%
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 20bb?

CO limps, BB isolates to 2bb, CO 3-bets to 4bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 20bb: the big blind (BB) folds 43.6%, calls 19.3% and goes all-in 19.84bb 37.1%. Always all-in 19.84bb: 99-TT, AQs, AJo-AQo. Mixed: 55-88, A8s-AJs, A5s, K9s+, QTs+, J9s, T9s, T6s, 98s, 87s, 76s, A8o-ATo, KJo+.

Always fold
K6s, J4s, 97s, KTo, QTo, JTo
Always call
No hand plays this every time
Always all-in 19.84bb
99-TT, AQs, AJo-AQo
Mixed
55-88, A8s-AJs, A5s, K9s+, QTs+, J9s, T9s, T6s, 98s, 87s, 76s, A8o-ATo, KJo+
Settings: 6-max · 20bb · 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, 20bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.9). 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.