PokerSolver
PokerSolver/Heads-up · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb/BB vs SB 4-bet 20.7bb

BB vs SB 4-bet 20.7bb

Heads-up · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb (blinds 0.5/1bb, ante 0.16bb) · 100bb · SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb · Big blind to act

Fits exactlyno game we have checked
Close1 games
  • CoinPoker cash with antes NL50rake before the flop in 3-bet pots there, none here
Tournament
Heads-up · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bbChange game
Stacks (bb), if they differ
Pot 30.02bbYour cards?
9bb
20.7bb

Tap your two cards.

Big blind's range

774 of 1,326 combos get here
Fold 62.6%Call 26.2%All-in 99.84bb 11.2%
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 Heads-up · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb at 100bb?

SB opens 3bb, BB 3-bets to 9bb, SB 4-bets to 20.7bb in Heads-up · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb, 100bb: the big blind (BB) folds 62.6%, calls 26.2% and goes all-in 99.84bb 11.2%. Always call: 55, A8s-AJs, A6s, KQs, K9s-KTs, Q9s+, J9s+, T9s, 87s, 76s, 65s, 54s, AJo, KJo+. Always all-in 99.84bb: JJ-KK, 33, AKs, AKo. Mixed: AA, 66-TT, 44, 22, AQs, A7s, A2s-A5s, KJs, K3s-K8s, Q7s-Q8s, J8s, T8s, 98s, 86s, 75s, 64s, 53s, 43s, AQo, QJo.

Always fold
Q6s, Q2s-Q4s, J6s-J7s, J2s-J3s, T3s-T7s, 93s-97s, 84s-85s, 73s-74s, 62s-63s, 52s, A5o-ATo, A2o-A3o, K6o-KTo, Q8o-QTo, J8o+, T7o+, 97o+, 86o+, 76o, 65o
Always call
55, A8s-AJs, A6s, KQs, K9s-KTs, Q9s+, J9s+, T9s, 87s, 76s, 65s, 54s, AJo, KJo+
Always all-in 99.84bb
JJ-KK, 33, AKs, AKo
Mixed
AA, 66-TT, 44, 22, AQs, A7s, A2s-A5s, KJs, K3s-K8s, Q7s-Q8s, J8s, T8s, 98s, 86s, 75s, 64s, 53s, 43s, AQo, QJo
Settings: Heads-up · 100bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 2bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 100bb stacks, 5% rake capped at 2bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 8.9). 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.

Rake sources for the games it fits: 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.