PokerSolver
PokerSolver/4-max · 100bb · SB 0.5bb · 5% rake, cap 3bb/BB vs CO 4-bet 20.7bb

BB vs CO 4-bet 20.7bb

4-max · SB 0.5bb · 5% rake, cap 3bb (blinds 0.5/1bb) · 100bb · CO opens 3bb, BB 3-bets to 9bb, CO 4-bets to 20.7bb · Big blind to act

4-max · 100bb · SB 0.5bb · 5% rake, cap 3bbChange game
Stacks (bb), if they differ
Pot 30.2bbYour cards?
9bb
20.7bb
0.5bb

Tap your two cards.

Big blind's range

354 of 1,326 combos get here
Fold 64.2%Call 30.2%All-in 100bb 5.6%
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 4-max · SB 0.5bb · 5% rake, cap 3bb at 100bb?

CO opens 3bb, BB 3-bets to 9bb, CO 4-bets to 20.7bb in 4-max · SB 0.5bb · 5% rake, cap 3bb, 100bb: the big blind (BB) folds 64.2%, calls 30.2% and goes all-in 100bb 5.6%. Always call: QQ, 44-TT, ATs+, T9s, 65s. Always all-in 100bb: AKo. Mixed: KK+, JJ, A8s, A4s-A5s, KTs+, JTs, 87s, 76s, 64s, 54s.

Always fold
A6s-A7s, A2s-A3s, K2s-K9s, Q8s+, Q6s, J8s-J9s, T7s-T8s, 98s, 86s, 75s, ATo, KJo+, QJo, JTo
Always call
QQ, 44-TT, ATs+, T9s, 65s
Always all-in 100bb
AKo
Mixed
KK+, JJ, A8s, A4s-A5s, KTs+, JTs, 87s, 76s, 64s, 54s
Settings: 4-max · 100bb · SB 0.5bb · 5% rake, cap 3bb (small blind 0.5bb, big blind 1bb, 100bb stacks, 5% rake capped at 3bb; before the flop, rake only after a 3-bet). Solver: HoldemResources Calculator (HRC) (HRC CI 20.31). 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: GGPoker regular cash NL50 (rake cap 6bb there, 3bb here).

Close: GGPoker regular cash NL100 (rake cap 3.75bb there, 3bb here).

Close: GGPoker regular cash NL200 (rake cap 2.25bb there, 3bb here).

Close: PokerStars cash NL50 (rake cap 1.5bb there, 3bb here; no rake when no flop is dealt there).

Close: CoinPoker cash NL2, NL10 (rake cap 6bb there, 3bb here; only its tables without antes).

Close: CoinPoker cash NL50 (rake cap 4.8bb there, 3bb here; only its tables without antes).

Close: CoinPoker cash NL100 (only its tables without antes).

Close: CoinPoker cash NL200 (rake cap 1.8bb there, 3bb here; only its tables without antes).

Close: WPT Global cash NL10, NL20 (4% rake there, 5% here; no rake when no flop is dealt there; only its tables without antes).

Close: WPT Global cash NL100, NL200 (rake cap 2bb there, 3bb here; 4% rake there, 5% here; no rake when no flop is dealt there; only its tables without antes).

Close: Natural8 regular cash NL50 (rake cap 6bb there, 3bb here).

Close: Natural8 regular cash NL100 (rake cap 3.75bb there, 3bb here).

Close: Natural8 regular cash NL200 (rake cap 2.25bb there, 3bb here).

Close: ACR Poker cash NL50 (rake cap 4bb there, 3bb here; its page does not say whether pots that end before the flop are raked).

Close: ACR Poker cash NL100 (rake cap 2bb there, 3bb here; its page does not say whether pots that end before the flop are raked).

CoinPoker tables with antes: their own chart.

Rake sources: ggpoker.com/poker-games/texas-holdem (fetched 2026-10-31); Rush rake and preflop rake confirmed on our own GG exports (972 of 1,034 pots, 210 of 211); regular tables' preflop rule from natural8.com/en/poker/texas-holdem (same network, fetched 2026-10-31); pokerstars.com/poker/room/rake (fetched 2026-10-31); coinpoker.com/games/texas-holdem/ (caps and the preflop rule) and coinpoker.com/guides/poker-rake/ (5%), fetched 2026-10-31; wptglobal.com/poker/poker-table-rake (fetched 2026-10-31); natural8.com/en/poker/texas-holdem (fetched 2026-10-31; caps by players dealt in, 3-bet pots raked before the flop); acrpoker.eu/real-money/poker-rake-calculation/ (fetched 2026-10-31).

Rake: Wrong rake for GG: this solve caps the rake at 3bb, but GG caps NL200 at $4.50 (2.25bb) with 4 players dealt in and $3 (1.5bb) with 3. A solve with GG's caps is queued.