PokerSolver
PokerSolver/5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs BTN 4-bet 20.7bb

BB vs BTN 4-bet 20.7bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (blinds 0.5/1bb, ante 0.16bb) · 250bb · BTN opens 3bb, BB 3-bets to 9bb, BTN 4-bets to 20.7bb · Big blind to act

5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 31bbYour cards?
9bb
20.7bb
0.5bb

Tap your two cards.

Big blind's range

570 of 1,326 combos get here
Fold 64.9%Call 25.5%Raise 45.54bb 6.8%All-in 249.84bb 2.8%
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 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 250bb?

BTN opens 3bb, BB 3-bets to 9bb, BTN 4-bets to 20.7bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 250bb: the big blind (BB) folds 64.9%, calls 25.5%, raises 45.54bb 6.8% and goes all-in 249.84bb 2.8%. Always call: QQ, 88-TT, 22-66, A9s-AQs, KQs, QTs+, J9s+, 87s, 76s, 65s, 54s. Always raise 45.54bb: AA. Always all-in 249.84bb: AKo. Mixed: KK, JJ, 77, AKs, A3s-A8s, K9s-KJs, Q9s, J8s, T8s+, 98s, 86s, AQo.

Always fold
A2s, K2s-K8s, Q8s, Q4s-Q6s, J3s-J7s, T4s-T7s, 95s-97s, 85s, 75s, 53s, 43s, ATo-AJo, A6o-A7o, A3o, K9o+, QTo+, J9o+, T9o
Always call
QQ, 88-TT, 22-66, A9s-AQs, KQs, QTs+, J9s+, 87s, 76s, 65s, 54s
Always raise 45.54bb
AA
Always all-in 249.84bb
AKo
Mixed
KK, JJ, 77, AKs, A3s-A8s, K9s-KJs, Q9s, J8s, T8s+, 98s, 86s, AQo
Settings: 5-max · 250bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb (small blind 0.5bb, big blind 1bb, an ante of 0.16bb from every player, 250bb stacks, 5% rake capped at 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.