PokerSolver
PokerSolver/6-max · 60bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs CO 4-bet 20.7bb

BB vs CO 4-bet 20.7bb

6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 60bb · CO opens 3bb, BB 3-bets to 9bb, CO 4-bets to 20.7bb · Big blind to act

6-max · 60bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 31.16bbYour cards?
9bb
20.7bb
0.5bb

Tap your two cards.

Big blind's range

552 of 1,326 combos get here
Fold 76.3%Call 6.2%All-in 59.84bb 17.5%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO opens 3bb, BB 3-bets to 9bb, CO 4-bets to 20.7bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 60bb?

CO opens 3bb, BB 3-bets to 9bb, CO 4-bets to 20.7bb in 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 60bb: the big blind (BB) folds 76.3%, calls 6.2% and goes all-in 59.84bb 17.5%. Always call: 99, AJs, A8s. Always all-in 59.84bb: TT+, 55-77, AQs+, KQs, AQo+. Mixed: 88, A4s-A6s, KJs, Q9s+.

Always fold
K8s, K3s-K4s, Q2s-Q8s, J3s-J8s, T6s-T8s, T4s, 98s, 96s, 85s-86s, 43s, AJo, A4o-A8o, K8o+, QTo+, JTo, T8o+, 87o
Always call
99, AJs, A8s
Always all-in 59.84bb
TT+, 55-77, AQs+, KQs, AQo+
Mixed
88, A4s-A6s, KJs, Q9s+
Settings: 6-max · 60bb · 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, 60bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.91). 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.