PokerSolver
PokerSolver/4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb/BB vs CO 4-bet 17.25bb

BB vs CO 4-bet 17.25bb

4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb (blinds 0.5/1bb, ante 0.16bb) · 80bb · CO opens 2.5bb, BB 3-bets to 7.5bb, CO 4-bets to 17.25bb · Big blind to act

4-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bbChange game
Stacks (bb), if they differ
Pot 25.89bbYour cards?
7.5bb
17.25bb
0.5bb

Tap your two cards.

Big blind's range

548 of 1,326 combos get here
Fold 77.3%Call 8.8%All-in 79.84bb 13.9%
Tap a hand, or type one above, to see its exact mix.

What is the GTO play for the big blind (BB) when CO opens 2.5bb, BB 3-bets to 7.5bb, CO 4-bets to 17.25bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb at 80bb?

CO opens 2.5bb, BB 3-bets to 7.5bb, CO 4-bets to 17.25bb in 4-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 4.8bb, 80bb: the big blind (BB) folds 77.3%, calls 8.8% and goes all-in 79.84bb 13.9%. Always call: 55, AQs, KQs, 87s. Always all-in 79.84bb: JJ-KK, 99, AKs, A5s, A2s, AKo. Mixed: AA, TT, 66-88, ATs-AJs, A7s-A8s, A3s-A4s, KJs, QTs, T9s, 98s, 76s, 65s, 54s, AQo.

Always fold
A6s, K3s-KTs, QJs, Q7s-Q9s, Q5s, J5s+, J3s, T5s-T8s, 85s, 74s-75s, 63s-64s, 43s, A7o-A8o, A4o-A5o, KTo+, QJo, J9o+, T8o+, 65o, 54o
Always call
55, AQs, KQs, 87s
Always all-in 79.84bb
JJ-KK, 99, AKs, A5s, A2s, AKo
Mixed
AA, TT, 66-88, ATs-AJs, A7s-A8s, A3s-A4s, KJs, QTs, T9s, 98s, 76s, 65s, 54s, AQo
Settings: 4-max · 80bb · 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, 80bb stacks, 5% rake capped at 4.8bb; 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.