PokerSolver
PokerSolver/5-max · 150bb · 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) · 150bb · 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 · 150bb · 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

620 of 1,326 combos get here
Fold 67.5%Call 26.2%All-in 149.84bb 6.3%
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 150bb?

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, 150bb: the big blind (BB) folds 67.5%, calls 26.2% and goes all-in 149.84bb 6.3%. Always call: 44-QQ, A9s-AQs, KTs+, QTs+, JTs, T9s, 87s, 76s, 65s, 54s, AQo. Always all-in 149.84bb: KK+, A3s-A4s, AKo. Mixed: AKs, A5s-A7s, A2s, K9s, K6s, J9s, T8s, 98s, 86s, 75s, 64s.

Always fold
K2s-K5s, Q9s, Q2s-Q7s, J7s-J8s, J5s, J2s, T5s-T7s, T3s, 95s-97s, 85s, 53s, A9o-AJo, A6o-A7o, A3o-A4o, KQo, K9o-KTo, K7o, Q9o+, J8o+, T8o+, 98o
Always call
44-QQ, A9s-AQs, KTs+, QTs+, JTs, T9s, 87s, 76s, 65s, 54s, AQo
Always all-in 149.84bb
KK+, A3s-A4s, AKo
Mixed
AKs, A5s-A7s, A2s, K9s, K6s, J9s, T8s, 98s, 86s, 75s, 64s
Settings: 5-max · 150bb · 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, 150bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.89). 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.