PokerSolver
PokerSolver/6-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

6-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

6-max · 80bb · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bbChange game
Stacks (bb), if they differ
Pot 26.21bbYour cards?
7.5bb
17.25bb
0.5bb

Tap your two cards.

Big blind's range

532 of 1,326 combos get here
Fold 76.6%Call 9.6%All-in 79.84bb 13.8%
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 6-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 6-max · SB 0.5bb · ante 0.16bb · 5% rake, cap 8bb, 80bb: the big blind (BB) folds 76.6%, calls 9.6% and goes all-in 79.84bb 13.8%. Always call: AJs, KQs, 87s. Always all-in 79.84bb: QQ+, 88, AKs, A5s, AKo. Mixed: TT-JJ, 66-77, AQs, A6s-A8s, A2s-A4s, KTs-KJs, QTs+, JTs, T9s, 98s, 76s, 65s, 54s.

Always fold
K2s-K9s, Q8s, Q6s, J7s-J9s, J4s-J5s, T4s-T8s, 85s-86s, 74s-75s, 43s, AQo, A4o-A8o, KTo+, K7o-K8o, QJo, J9o+, T8o+, 76o, 65o
Always call
AJs, KQs, 87s
Always all-in 79.84bb
QQ+, 88, AKs, A5s, AKo
Mixed
TT-JJ, 66-77, AQs, A6s-A8s, A2s-A4s, KTs-KJs, QTs+, JTs, T9s, 98s, 76s, 65s, 54s
Settings: 6-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 24.92). 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.