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

4-max · 200bb · 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

750 of 1,326 combos get here
Fold 48.5%Call 30.2%Raise 45.54bb 21.3%All-in 199.84bb 0%
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 200bb?

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, 200bb: the big blind (BB) folds 48.5%, calls 30.2% and raises 45.54bb 21.3%. Always call: 22-JJ, A9s-AQs, A5s, A2s, KTs+, K8s, K2s, Q9s+, J9s+, T9s, 97s+, 86s+, 76s, 64s+, 54s, 43s. Always raise 45.54bb: KK+, T6s, ATo-AJo, A5o, KTo+. Mixed: QQ, AKs, A6s-A8s, A3s-A4s, K9s, K3s-K7s, T7s-T8s, 96s, 85s, 74s-75s, 63s, 53s, AQo+, A4o.

Always fold
Q2s, J2s-J3s, T2s-T5s, 92s-95s, 84s, 52s, A6o, A2o-A3o, K3o-K9o, Q5o-Q9o, J7o-J8o, T7o
Always call
22-JJ, A9s-AQs, A5s, A2s, KTs+, K8s, K2s, Q9s+, J9s+, T9s, 97s+, 86s+, 76s, 64s+, 54s, 43s
Always raise 45.54bb
KK+, T6s, ATo-AJo, A5o, KTo+
Mixed
QQ, AKs, A6s-A8s, A3s-A4s, K9s, K3s-K7s, T7s-T8s, 96s, 85s, 74s-75s, 63s, 53s, AQo+, A4o
Settings: 4-max · 200bb · 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, 200bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.95). 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.