PokerSolver
PokerSolver/4-max · 250bb · 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) · 250bb · SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb · Big blind to act

4-max · 250bb · 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

802 of 1,326 combos get here
Fold 55.2%Call 31.5%Raise 45.54bb 13.3%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 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 250bb?

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, 250bb: the big blind (BB) folds 55.2%, calls 31.5%, raises 45.54bb 13.3% and goes all-in 249.84bb 0%. Always call: 22-QQ, AJs-AQs, A8s-A9s, A3s, KTs+, K8s, K2s-K6s, Q9s+, J9s+, 96s, 86s, 75s+, 64s+, 53s+, 43s. Always raise 45.54bb: KK+, AKs, A6s, ATo-AJo, KQo. Mixed: ATs, A7s, A4s-A5s, A2s, K9s, K7s, J8s, T7s+, 97s+, 87s, 74s, 63s, AQo+, KTo-KJo, JTo.

Always fold
T2s-T6s, 93s-95s, 73s, 52s, A2o-A6o, K3o-K9o, QJo, Q5o-Q9o, J7o-J9o, T7o+, 98o
Always call
22-QQ, AJs-AQs, A8s-A9s, A3s, KTs+, K8s, K2s-K6s, Q9s+, J9s+, 96s, 86s, 75s+, 64s+, 53s+, 43s
Always raise 45.54bb
KK+, AKs, A6s, ATo-AJo, KQo
Always all-in 249.84bb
No hand plays this every time
Mixed
ATs, A7s, A4s-A5s, A2s, K9s, K7s, J8s, T7s+, 97s+, 87s, 74s, 63s, AQo+, KTo-KJo, JTo
Settings: 4-max · 250bb · 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, 250bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.91). 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.