PokerSolver
PokerSolver/4-max · 200bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs BTN 4-bet 20.7bb

BB vs BTN 4-bet 20.7bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 200bb · BTN opens 3bb, BB 3-bets to 9bb, BTN 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
4-max · 200bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 30.84bbYour cards?
9bb
20.7bb
0.5bb

Tap your two cards.

Big blind's range

518 of 1,326 combos get here
Fold 61.6%Call 28.1%Raise 45.54bb 7.2%All-in 199.84bb 3.1%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when BTN opens 3bb, BB 3-bets to 9bb, BTN 4-bets to 20.7bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 200bb?

BTN opens 3bb, BB 3-bets to 9bb, BTN 4-bets to 20.7bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 200bb: the big blind (BB) folds 61.6%, calls 28.1%, raises 45.54bb 7.2% and goes all-in 199.84bb 3.1%. Always call: 99-JJ, 22-77, A9s-AQs, A5s, KJs+, QTs+, J9s+, 86s+, 76s, 65s, 54s. Always raise 45.54bb: AA. Always all-in 199.84bb: AKo. Mixed: QQ-KK, 88, AKs, A6s-A7s, A3s-A4s, K9s-KTs, K4s, T8s+, 98s, 75s, AQo.

Always fold
A2s, K5s-K8s, K3s, Q4s-Q9s, Q2s, J7s-J8s, J4s-J5s, T4s-T7s, 95s-97s, 85s, ATo, A6o-A7o, A3o-A4o, KTo+, Q9o+, JTo, T9o, 98o
Always call
99-JJ, 22-77, A9s-AQs, A5s, KJs+, QTs+, J9s+, 86s+, 76s, 65s, 54s
Always raise 45.54bb
AA
Always all-in 199.84bb
AKo
Mixed
QQ-KK, 88, AKs, A6s-A7s, A3s-A4s, K9s-KTs, K4s, T8s+, 98s, 75s, AQo
Settings: 4-max · 200bb · 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, 200bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.95). 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.