PokerSolver
PokerSolver/5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb/BB vs CO 4-bet 17.25bb

BB vs CO 4-bet 17.25bb

5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 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

5-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 26.05bbYour cards?
7.5bb
17.25bb
0.5bb

Tap your two cards.

Big blind's range

598 of 1,326 combos get here
Fold 79.9%Call 9.1%All-in 79.84bb 11%
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 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb at 80bb?

CO opens 2.5bb, BB 3-bets to 7.5bb, CO 4-bets to 17.25bb in 5-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 80bb: the big blind (BB) folds 79.9%, calls 9.1% and goes all-in 79.84bb 11%. Always call: AJs-AQs, KQs, 98s, 87s. Always all-in 79.84bb: JJ+, 88, AKs, A5s, A3s, AKo. Mixed: TT, 55-77, A7s-A8s, KTs-KJs, QTs+, T9s, 76s, 65s.

Always fold
A6s, A4s, A2s, K4s-K9s, K2s, Q8s-Q9s, Q6s, J3s+, T6s-T8s, T4s, 84s-85s, 54s, 42s, 32s, AQo, A3o-A8o, K6o+, QJo, J9o+, T8o+, 76o, 65o, 54o
Always call
AJs-AQs, KQs, 98s, 87s
Always all-in 79.84bb
JJ+, 88, AKs, A5s, A3s, AKo
Mixed
TT, 55-77, A7s-A8s, KTs-KJs, QTs+, T9s, 76s, 65s
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.

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.