PokerSolver
PokerSolver/4-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs SB 4-bet 20.7bb

BB vs SB 4-bet 20.7bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 150bb · SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb · Big blind to act

4-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 30.34bbYour cards?
9bb
20.7bb

Tap your two cards.

Big blind's range

718 of 1,326 combos get here
Fold 53%Call 41.9%All-in 149.84bb 5.1%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 150bb?

SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 150bb: the big blind (BB) folds 53%, calls 41.9% and goes all-in 149.84bb 5.1%. Always call: AA, 22-TT, ATs+, A8s, A6s, K8s+, K2s-K6s, Q9s+, J8s+, T8s+, 96s+, 86s+, 75s+, 65s, 53s+, 43s, AJo-AQo, KJo+. Always all-in 149.84bb: QQ-KK, AKo. Mixed: JJ, A2s-A5s, 85s.

Always fold
J4s, J2s, T5s, T2s-T3s, 92s-95s, 84s, 73s, 63s, 42s, 32s, A6o, A2o-A4o, K3o-K6o, Q4o-Q8o, J7o-J8o, J5o, T6o-T7o, 96o-97o
Always call
AA, 22-TT, ATs+, A8s, A6s, K8s+, K2s-K6s, Q9s+, J8s+, T8s+, 96s+, 86s+, 75s+, 65s, 53s+, 43s, AJo-AQo, KJo+
Always all-in 149.84bb
QQ-KK, AKo
Mixed
JJ, A2s-A5s, 85s
Settings: 4-max · 150bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 150bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.5). 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.