PokerSolver
PokerSolver/5-max · 80bb · 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) · 80bb · 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
5-max · 80bb · 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

618 of 1,326 combos get here
Fold 74.4%Call 8.4%All-in 79.84bb 17.2%
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 80bb?

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, 80bb: the big blind (BB) folds 74.4%, calls 8.4% and goes all-in 79.84bb 17.2%. Always call: 88, ATs-AJs, QTs+, JTs, T9s, 65s. Always all-in 79.84bb: 99-KK, 55, AKs, A4s-A5s, KJs, AKo. Mixed: AA, 66-77, AQs, A3s, KQs, KTs, 98s, 87s, 76s, 54s, AQo.

Always fold
A2s, K2s-K6s, Q4s-Q8s, J2s-J8s, T4s-T8s, 95s-97s, 85s-86s, 75s, 63s-64s, 52s-53s, 42s+, ATo-AJo, A3o-A6o, KTo+, K7o, Q8o+, J8o+, T8o+, 98o, 76o
Always call
88, ATs-AJs, QTs+, JTs, T9s, 65s
Always all-in 79.84bb
99-KK, 55, AKs, A4s-A5s, KJs, AKo
Mixed
AA, 66-77, AQs, A3s, KQs, KTs, 98s, 87s, 76s, 54s, AQo
Settings: 5-max · 80bb · 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, 80bb stacks, 5% rake capped at 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.