PokerSolver
PokerSolver/5-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

5-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

5-max · 200bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 31bbYour cards?
9bb
20.7bb
0.5bb

Tap your two cards.

Big blind's range

408 of 1,326 combos get here
Fold 64%Call 27.2%Raise 45.54bb 8.7%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 5-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 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 200bb: the big blind (BB) folds 64%, calls 27.2%, raises 45.54bb 8.7% and goes all-in 199.84bb 0.1%. Always call: JJ-QQ, 99, 33-77, AQs, JTs, T9s, 87s, 76s, 65s, 54s. Always raise 45.54bb: AA. Mixed: KK, TT, 88, AKs, ATs-AJs, A7s-A8s, A3s-A5s, KTs+, QTs+, J9s, T8s, 98s, AKo.

Always fold
A6s, A2s, K4s-K9s, K2s, Q4s-Q9s, J8s, J5s, T6s-T7s, 96s-97s, 86s, 43s, AQo, A8o, KQo, QJo, JTo
Always call
JJ-QQ, 99, 33-77, AQs, JTs, T9s, 87s, 76s, 65s, 54s
Always raise 45.54bb
AA
Always all-in 199.84bb
No hand plays this every time
Mixed
KK, TT, 88, AKs, ATs-AJs, A7s-A8s, A3s-A5s, KTs+, QTs+, J9s, T8s, 98s, AKo
Settings: 5-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 24.99). 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.