PokerSolver
PokerSolver/6-max · 200bb · 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) · 200bb · CO opens 3bb, BB 3-bets to 9bb, CO 4-bets to 20.7bb · Big blind to act

6-max · 200bb · 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

380 of 1,326 combos get here
Fold 61.3%Call 28.3%Raise 45.54bb 10.4%All-in 199.84bb <0.1%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO 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 200bb?

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, 200bb: the big blind (BB) folds 61.3%, calls 28.3%, raises 45.54bb 10.4% and goes all-in 199.84bb 0%. Always call: JJ-QQ, 33-99, AQs, T9s, 87s, 76s, 65s. Always raise 45.54bb: AA, ATs. Mixed: KK, TT, AKs, AJs, A2s-A8s, KQs, KTs, QTs+, JTs, 86s, 54s, AKo.

Always fold
KJs, K2s-K9s, Q8s-Q9s, Q4s-Q6s, J7s-J9s, J5s, T6s-T8s, 98s, 96s, 75s, 43s, A8o, KJo+, QJo, JTo
Always call
JJ-QQ, 33-99, AQs, T9s, 87s, 76s, 65s
Always raise 45.54bb
AA, ATs
Always all-in 199.84bb
No hand plays this every time
Mixed
KK, TT, AKs, AJs, A2s-A8s, KQs, KTs, QTs+, JTs, 86s, 54s, AKo
Settings: 6-max · 200bb · 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, 200bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 28.67). 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.