PokerSolver
PokerSolver/5-max · 100bb · 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) · 100bb · CO opens 2.5bb, BB 3-bets to 7.5bb, CO 4-bets to 17.25bb · Big blind to act

5-max · 100bb · 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

536 of 1,326 combos get here
Fold 74.1%Call 15.8%All-in 99.84bb 10.1%
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 100bb?

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, 100bb: the big blind (BB) folds 74.1%, calls 15.8% and goes all-in 99.84bb 10.1%. Always call: 55-66, AJs-AQs, 76s. Always all-in 99.84bb: KK, AKo. Mixed: AA, TT-QQ, 77-88, AKs, A8s, A2s-A6s, KTs+, QTs, JTs, T9s, 97s+, 86s+, 64s+, 54s, AQo.

Always fold
A7s, K4s-K9s, QJs, Q7s-Q9s, Q4s-Q5s, Q2s, J7s-J9s, J5s, J3s, T5s-T8s, 96s, 84s-85s, 75s, 63s, 52s-53s, 42s+, A7o-A8o, A4o-A5o, KJo+, K9o, QJo, JTo, T8o+, 87o, 65o
Always call
55-66, AJs-AQs, 76s
Always all-in 99.84bb
KK, AKo
Mixed
AA, TT-QQ, 77-88, AKs, A8s, A2s-A6s, KTs+, QTs, JTs, T9s, 97s+, 86s+, 64s+, 54s, 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.

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.