PokerSolver
PokerSolver/Heads-up · 80bb · 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) · 80bb · 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
Heads-up · 80bb · 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

850 of 1,326 combos get here
Fold 68.2%Call 19.3%All-in 79.84bb 12.5%
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 80bb?

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, 80bb: the big blind (BB) folds 68.2%, calls 19.3% and goes all-in 79.84bb 12.5%. Always call: AA, A9s-AJs, A6s, KTs, JTs, KJo. Always all-in 79.84bb: JJ-KK, 44, AQs+, AKo. Mixed: 55-TT, 22-33, A7s-A8s, A2s-A5s, KJs+, K2s-K9s, QTs+, Q8s, Q4s-Q5s, J8s-J9s, J4s, T8s+, 97s, 86s, 75s+, 64s+, 54s, 52s, ATo-AQo, KQo, KTo, QTo+, JTo.

Always fold
Q6s-Q7s, Q2s-Q3s, J5s-J7s, T2s-T7s, 98s, 92s-96s, 87s, 84s-85s, 72s-74s, 62s, 53s, 42s+, A2o-A9o, K8o-K9o, K5o-K6o, K3o, Q7o-Q9o, Q4o, J8o-J9o, T7o+, 97o+, 86o+, 76o, 65o
Always call
AA, A9s-AJs, A6s, KTs, JTs, KJo
Always all-in 79.84bb
JJ-KK, 44, AQs+, AKo
Mixed
55-TT, 22-33, A7s-A8s, A2s-A5s, KJs+, K2s-K9s, QTs+, Q8s, Q4s-Q5s, J8s-J9s, J4s, T8s+, 97s, 86s, 75s+, 64s+, 54s, 52s, ATo-AQo, KQo, KTo, QTo+, JTo
Settings: Heads-up · 80bb · 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, 80bb stacks, 5% rake capped at 2bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 22.38). 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.