PokerSolver
PokerSolver/4-max · 100bb · 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) · 100bb · CO opens 2.5bb, BB 3-bets to 7.5bb, CO 4-bets to 17.25bb · Big blind to act

4-max · 100bb · 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

514 of 1,326 combos get here
Fold 71%Call 21.1%All-in 99.84bb 7.9%
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 100bb?

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, 100bb: the big blind (BB) folds 71%, calls 21.1% and goes all-in 99.84bb 7.9%. Always call: 55-99, AJs-AQs, KJs, T9s, AQo. Always all-in 99.84bb: KK, AKo. Mixed: AA, TT-QQ, AKs, A8s, A3s-A6s, KQs, KTs, QTs+, J9s+, T8s, 98s, 86s+, 76s, 64s+, 54s.

Always fold
A7s, A2s, K2s-K9s, Q4s-Q9s, J7s-J8s, J5s, T5s-T7s, 96s, 85s, 75s, 42s+, AJo, A8o, A5o-A6o, K9o+, QTo+, J9o+, T9o, 65o
Always call
55-99, AJs-AQs, KJs, T9s, AQo
Always all-in 99.84bb
KK, AKo
Mixed
AA, TT-QQ, AKs, A8s, A3s-A6s, KQs, KTs, QTs+, J9s+, T8s, 98s, 86s+, 76s, 64s+, 54s
Settings: 4-max · 100bb · 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, 100bb stacks, 5% rake capped at 4.8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.66). 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.