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) · 100bb · BTN opens 3bb, BB 3-bets to 9bb, BTN 4-bets to 20.7bb · Big blind to act
Fits exactlyno game we have checked
CloseCP1 games
- CPCoinPoker cash with antes NL50rake before the flop in 3-bet pots there, none here
5-max · 100bb · 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
608 of 1,326 combos get hereFold 72.9%Call 13.9%All-in 99.84bb 13.3%
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 100bb?
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, 100bb: the big blind (BB) folds 72.9%, calls 13.9% and goes all-in 99.84bb 13.3%. Always call: 55, ATs-AJs, KTs+, QTs+, JTs, T9s, 87s, 76s, 65s, 54s. Always all-in 99.84bb: JJ+, 77-99, AKs, A2s-A5s, AKo. Mixed: TT, 66, AQs, J9s, 98s, AQo.
- Always fold
- K9s, K2s-K7s, Q4s-Q7s, J4s-J7s, J2s, T4s-T8s, 95s-97s, 85s-86s, 75s, 63s-64s, 53s, 43s, ATo-AJo, A3o-A7o, K9o+, K7o, Q9o+, J8o+, T8o+
- Always call
- 55, ATs-AJs, KTs+, QTs+, JTs, T9s, 87s, 76s, 65s, 54s
- Always all-in 99.84bb
- JJ+, 77-99, AKs, A2s-A5s, AKo
- Mixed
- TT, 66, AQs, J9s, 98s, AQo
Settings: 5-max · 100bb · 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, 100bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 23.9). 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.