PokerSolver
PokerSolver/5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs SB 4-bet 20.7bb

BB vs SB 4-bet 20.7bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 250bb · SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb · Big blind to act

5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 30.5bbYour cards?
9bb
20.7bb

Tap your two cards.

Big blind's range

754 of 1,326 combos get here
Fold 52.4%Call 29.9%Raise 45.54bb 17.6%All-in 249.84bb 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 SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 250bb?

SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 250bb: the big blind (BB) folds 52.4%, calls 29.9%, raises 45.54bb 17.6% and goes all-in 249.84bb 0.1%. Always call: 88-QQ, 22-66, A9s-AQs, A5s, K7s+, K3s-K4s, QTs+, J8s+, T9s, 97s, 86s, 76s, 64s+, 53s+. Always raise 45.54bb: KK+, AKs, A4s, T7s, ATo-AJo, KTo+. Mixed: A6s-A8s, A2s-A3s, K5s, T8s, 98s, 96s, 87s, 75s, 43s, AQo+, A5o.

Always fold
J2s, T2s-T6s, 93s-95s, 63s, 52s, 42s, 32s, A6o, A2o-A4o, K9o, K3o-K6o, Q4o-Q9o, J7o-J9o, T6o-T8o, 98o, 86o, 54o
Always call
88-QQ, 22-66, A9s-AQs, A5s, K7s+, K3s-K4s, QTs+, J8s+, T9s, 97s, 86s, 76s, 64s+, 53s+
Always raise 45.54bb
KK+, AKs, A4s, T7s, ATo-AJo, KTo+
Always all-in 249.84bb
No hand plays this every time
Mixed
A6s-A8s, A2s-A3s, K5s, T8s, 98s, 96s, 87s, 75s, 43s, AQo+, A5o
Settings: 5-max · 250bb · 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, 250bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.98). 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.