PokerSolver
PokerSolver/6-max · 20bb · SB 0.5bb · 5% rake, cap 3bb/BB vs BTN open 3bb

BB vs BTN open 3bb

6-max · SB 0.5bb · 5% rake, cap 3bb (blinds 0.5/1bb) · 20bb · BTN opens 3bb · Big blind to act

6-max · 20bb · SB 0.5bb · 5% rake, cap 3bbChange game
Stacks (bb), if they differ
Pot 4.5bbYour cards?
1bb
3bb
0.5bb

Tap your two cards.

Big blind's range

1,326 of 1,326 combos get here
Fold 72%Call 12.2%Raise 6bb 7.7%All-in 20bb 8.2%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when BTN opens 3bb in 6-max · SB 0.5bb · 5% rake, cap 3bb at 20bb?

BTN opens 3bb in 6-max · SB 0.5bb · 5% rake, cap 3bb, 20bb: the big blind (BB) folds 72%, calls 12.2%, raises 6bb 7.7% and goes all-in 20bb 8.2%. Always call: A6s, K9s, K7s, Q8s. Always raise 6bb: KK+, AQs+, ATs, A8s. Always all-in 20bb: 88-99, AJo. Mixed: TT-QQ, 22-77, AJs, A9s, A7s, A2s-A5s, KTs+, K8s, K2s-K6s, Q9s+, Q6s-Q7s, Q4s, J6s+, T8s+, 97s+, 93s, 86s+, 76s, 64s+, 54s, 43s, AQo+, A8o-ATo, A5o-A6o, KTo+, Q9o+, JTo.

Always fold
Q5s, Q2s-Q3s, J2s-J5s, T2s-T7s, 94s-96s, 92s, 82s-85s, 72s-75s, 62s-63s, 52s-53s, 42s, 32s, A7o, A2o-A4o, K2o-K9o, Q2o-Q8o, J2o-J9o, T2o+, 92o+, 82o+, 72o+, 62o+, 52o+, 42o+, 32o
Always call
A6s, K9s, K7s, Q8s
Always raise 6bb
KK+, AQs+, ATs, A8s
Always all-in 20bb
88-99, AJo
Mixed
TT-QQ, 22-77, AJs, A9s, A7s, A2s-A5s, KTs+, K8s, K2s-K6s, Q9s+, Q6s-Q7s, Q4s, J6s+, T8s+, 97s+, 93s, 86s+, 76s, 64s+, 54s, 43s, AQo+, A8o-ATo, A5o-A6o, KTo+, Q9o+, JTo
Settings: 6-max · 20bb · SB 0.5bb · 5% rake, cap 3bb (small blind 0.5bb, big blind 1bb, 20bb stacks, 5% rake capped at 3bb; before the flop, rake only after a 3-bet). Solver: HoldemResources Calculator (HRC) (HRC CI 24.03). 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: GGPoker Rush & Cash NL2, NL10, NL50, NL100, NL200; GGPoker regular cash NL200; Natural8 Rush & Cash NL2, NL10, NL50, NL100, NL200; Natural8 regular cash NL200.

Close: GGPoker regular cash NL2, NL10 (rake cap 10bb there, 3bb here).

Close: GGPoker regular cash NL50 (rake cap 8bb there, 3bb here).

Close: GGPoker regular cash NL100 (rake cap 5bb there, 3bb here).

Close: PokerStars Zoom NL10 (rake cap 15bb there, 3bb here; 4.5% rake there, 5% here; no rake when no flop is dealt there).

Close: PokerStars Zoom NL50 (rake cap 4bb there, 3bb here; no rake when no flop is dealt there).

Close: PokerStars Zoom NL100 (rake cap 2.5bb there, 3bb here; no rake when no flop is dealt there).

Close: PokerStars cash NL10 (rake cap 15bb there, 3bb here; 4.25% rake there, 5% here; no rake when no flop is dealt there).

Close: PokerStars cash NL50 (rake cap 4bb there, 3bb here; no rake when no flop is dealt there).

Close: PokerStars cash NL100 (rake cap 2.5bb there, 3bb here; no rake when no flop is dealt there).

Close: CoinPoker cash NL2, NL10 (rake cap 10bb there, 3bb here; only its tables without antes).

Close: CoinPoker cash NL50 (rake cap 8bb there, 3bb here; only its tables without antes).

Close: CoinPoker cash NL100 (rake cap 5bb there, 3bb here; only its tables without antes).

Close: CoinPoker cash NL200 (only its tables without antes).

Close: WPT Global cash NL10, NL20 (rake cap 6bb there, 3bb here; 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 4bb there, 3bb here; 4% rake there, 5% here; no rake when no flop is dealt there; only its tables without antes).

Close: WPT Global cash NL400, NL600, NL1000 (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 NL2, NL10 (rake cap 10bb there, 3bb here).

Close: Natural8 regular cash NL50 (rake cap 8bb there, 3bb here).

Close: Natural8 regular cash NL100 (rake cap 5bb there, 3bb here).

Close: ACR Poker cash NL2 (rake cap 150bb there, 3bb here; its page does not say whether pots that end before the flop are raked).

Close: ACR Poker cash NL10 (rake cap 30bb there, 3bb here; its page does not say whether pots that end before the flop are raked).

Close: ACR Poker cash NL50 (rake cap 6bb there, 3bb here; its page does not say whether pots that end before the flop are raked).

Close: ACR Poker cash NL100 (its page does not say whether pots that end before the flop are raked).

Close: ACR Poker cash NL200 (rake cap 1.5bb 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); natural8.com/en/poker/rush-and-cash (fetched 2026-10-31; caps $0.06 to $6, 3bb at every stake); the same GGNetwork pools as GGPoker, whose preflop rake we confirmed on GG exports; natural8.com/en/poker/texas-holdem (fetched 2026-10-31; caps by players dealt in, 3-bet pots raked before the flop); 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); acrpoker.eu/real-money/poker-rake-calculation/ (fetched 2026-10-31).