PokerSolver
PokerSolver/4-max · 80bb · 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) · 80bb · SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb · Big blind to act

4-max · 80bb · 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

794 of 1,326 combos get here
Fold 66.5%Call 19.3%All-in 79.84bb 14.3%
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 80bb?

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, 80bb: the big blind (BB) folds 66.5%, calls 19.3% and goes all-in 79.84bb 14.3%. Always call: AA, ATs-AJs, KTs, K3s, QTs, JTs, T8s+, 96s+, 85s+, 76s, 65s, 53s+, 43s, AJo, KQo. Always all-in 79.84bb: TT-KK, 22-88, AKs, A4s-A5s, KJs+, AKo. Mixed: 99, AQs, QJs, T6s, 95s, AQo, ATo.

Always fold
T2s-T4s, 92s-94s, 83s, 32s, A9o, A2o-A6o, K9o, K2o-K6o, Q4o-Q9o, Q2o, J3o-J9o, T5o+, 96o+, 86o
Always call
AA, ATs-AJs, KTs, K3s, QTs, JTs, T8s+, 96s+, 85s+, 76s, 65s, 53s+, 43s, AJo, KQo
Always all-in 79.84bb
TT-KK, 22-88, AKs, A4s-A5s, KJs+, AKo
Mixed
99, AQs, QJs, T6s, 95s, AQo, ATo
Settings: 4-max · 80bb · 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, 80bb stacks, 5% rake capped at 4.8bb; 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.