PokerSolver
PokerSolver/5-max · 200bb · 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) · 200bb · CO opens 2.5bb, BB 3-bets to 7.5bb, CO 4-bets to 17.25bb · Big blind to act

5-max · 200bb · 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

424 of 1,326 combos get here
Fold 65.9%Call 25.9%Raise 37.95bb 7.8%All-in 199.84bb 0.4%
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 200bb?

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, 200bb: the big blind (BB) folds 65.9%, calls 25.9%, raises 37.95bb 7.8% and goes all-in 199.84bb 0.4%. Always call: QQ, 99, 44-77, AQs, QTs. Always raise 37.95bb: AA. Mixed: KK, TT-JJ, 88, AKs, A9s-AJs, A7s, A3s-A5s, KTs+, QJs, JTs, T8s+, 97s+, 87s, 76s, 65s, 54s, AKo.

Always fold
A8s, A6s, A2s, K3s-K9s, Q9s, Q5s-Q6s, J8s-J9s, J6s, T6s-T7s, T4s, 95s-96s, 85s-86s, 64s, 53s, AQo, A8o, KJo+, QJo, JTo
Always call
QQ, 99, 44-77, AQs, QTs
Always raise 37.95bb
AA
Always all-in 199.84bb
No hand plays this every time
Mixed
KK, TT-JJ, 88, AKs, A9s-AJs, A7s, A3s-A5s, KTs+, QJs, JTs, T8s+, 97s+, 87s, 76s, 65s, 54s, AKo
Settings: 5-max · 200bb · 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, 200bb stacks, 5% rake capped at 8bb; no rake when no flop is dealt). Solver: HoldemResources Calculator (HRC) (HRC CI 24.99). 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.