PokerSolver
PokerSolver/4-max · 250bb · 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) · 250bb · BTN opens 3bb, BB 3-bets to 9bb, BTN 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 30.84bbYour cards?
9bb
20.7bb
0.5bb

Tap your two cards.

Big blind's range

554 of 1,326 combos get here
Fold 62.5%Call 28.2%Raise 45.54bb 6.5%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 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 250bb?

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, 250bb: the big blind (BB) folds 62.5%, calls 28.2%, raises 45.54bb 6.5% and goes all-in 249.84bb 2.8%. Always call: JJ-QQ, 99, 77, 22-55, A9s-ATs, KQs, QTs+, J9s, 86s+, 64s+, 54s. Always raise 45.54bb: AA, A7s. Always all-in 249.84bb: AKo. Mixed: KK, TT, 88, 66, AJs+, A8s, A3s-A6s, KTs-KJs, K7s, Q9s, JTs, T8s+, 97s+, 76s, 53s, AQo.

Always fold
A2s, K8s-K9s, K2s-K6s, Q3s-Q8s, J3s-J8s, T6s-T7s, 95s-96s, 85s, 75s, 63s, 43s, ATo-AJo, A6o-A7o, A3o-A4o, KQo, KTo, QTo+, J9o+, T8o+
Always call
JJ-QQ, 99, 77, 22-55, A9s-ATs, KQs, QTs+, J9s, 86s+, 64s+, 54s
Always raise 45.54bb
AA, A7s
Always all-in 249.84bb
AKo
Mixed
KK, TT, 88, 66, AJs+, A8s, A3s-A6s, KTs-KJs, K7s, Q9s, JTs, T8s+, 97s+, 76s, 53s, AQo
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.